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Terms of Service

Effective October 9, 2026 · DosSantos Systems LLC · applies to this website and every app we publish

The short version

These terms cover this website and every app we publish under our own name: today PlaneCost, Sweep, Payday Away, Tucked In, Just Invoices, Pet Papers, ClearSky, Color Cam, Hexponents, Palette Party and It's Just Blackjack, and anything we release later, from the day it ships. Our apps are tools. What they calculate or suggest is not an official record and not professional advice, so check it before you rely on it, and anything an app deletes or changes, it does because you told it to. Anything bought through an app store is billed and refunded by that store, not by us. Work we do for you as a client is governed by the agreement we sign for it, not by this page. Your data is yours.

01

The agreement, and what it covers

These Terms of Service ("Terms") are an agreement between you and DosSantos Systems LLC ("we", "us"), 488 Pleasant St, Unit 1A, New Bedford, MA 02740. They cover:

  • This website, dossantossystems.com.
  • Every app we publish under our own name, on any platform, together with anything sold inside it: today PlaneCost: Track Airplane Cost, Sweep: The Screenshot Cleaner, Payday Away: The Countdown App, Tucked In, Just Invoices, Pet Papers, ClearSky: Airport METAR Widget, Color Cam: The Color Finder, Hexponents: Daily Math Puzzle, Palette Party: Color Match and It's Just Blackjack. An app we release later is covered from the day it is released, whether or not it has been added to this page yet. Section 09 lists them.

Together we call these "the Services". By using the website, or installing or using one of our apps, you agree to these Terms. If you do not agree, do not use the Services.

Client work is not governed by this page. If we design, build, run or host software for your business, the written agreement, statement of work or proposal we sign for that project governs it. Where that agreement and these Terms disagree, that agreement wins. Section 11 says the little that applies in any case.

02

Who may use the Services

You must be old enough to form a binding contract where you live, and you must not be barred from using the Services under the law that applies to you. If you are using them for a business, you confirm you are authorized to accept these Terms on its behalf.

03

This website

The website is here to describe what we do and to let you get in touch. Use it in good faith: do not try to break it, scrape it at a volume that degrades it for anyone else, or submit anything through a form on it (the project inquiry form, or an app's support form) that you have no right to send. Anything you tell us through a form is handled as described in our Privacy Policy.

Descriptions of past work on this site are illustrative. They are not an offer, a price, or a promise of the same result for you.

04

Our apps: the license

Our apps are licensed, not sold, to you. Subject to these Terms we grant you a personal, non-exclusive, non-transferable, revocable license to use the app on devices you own or control, for your own purposes — personal or business. You get no other rights, and we keep everything we do not expressly grant.

05

App stores, and Apple’s terms

Where you get one of our apps from an app store, that store's own rules apply alongside these Terms. For an app downloaded from Apple's App Store, the download is governed by Apple's Licensed Application End User License Agreement (the "EULA", apple.com/legal/internet-services/itunes/dev/stdeula). These Terms add to the EULA; where the two conflict about the license itself, the EULA governs. In particular:

  • This agreement is between you and us only. Apple is not a party to it and is not responsible for the app or its content.
  • You may use the app on Apple-branded devices that you own or control, as permitted by the App Store's Usage Rules, including through Family Sharing where Apple makes it available.
  • We, not Apple, are responsible for maintaining and supporting the app. Apple has no obligation to provide maintenance or support for it.
  • If the app fails to conform to a warranty that cannot be excluded, you may notify Apple, and Apple may refund the price you paid for the app. To the maximum extent permitted by law, Apple has no other warranty obligation for the app.
  • We, not Apple, are responsible for addressing any claim relating to the app, including product liability claims, claims that the app fails to meet a legal or regulatory requirement, and consumer protection claims.
  • If a third party claims the app infringes its intellectual property, we, not Apple, are responsible for investigating, defending, settling and discharging the claim.
  • You confirm that you are not located in a country subject to a United States Government embargo or designated as a "terrorist supporting" country, and that you are not on any United States Government list of prohibited or restricted parties.
  • You must comply with any third-party terms that apply when you use the app.
  • Apple and its subsidiaries are third-party beneficiaries of these Terms and may enforce them against you.
06

Purchases and subscriptions

Our apps are sold, where they are sold at all, through the app store you get them from. Depending on the app that means a one-time price, an in-app purchase, a subscription, or nothing; each app's store listing says which. The one exception is Hexponents on the web, which we sell ourselves through Stripe, and Annex H says how that works. For everything bought through an app store:

  • Prices are shown in the store before you buy, in your local currency, and may change for future purchases.
  • Payment is charged to your store account and handled entirely by the store.
  • Refunds are handled by the store under its policies. We cannot issue refunds for purchases made through an app store.
  • A one-time purchase has nothing to renew. It stays yours for as long as the store lets you keep and re-download it.

Where an app sells an auto-renewable subscription, these rules apply as well:

  • The price and the renewal period are shown in the store and in the app before you subscribe, and a price change reaches you through the store before it applies.
  • Where offered, an introductory free trial applies once per eligible customer. When the trial ends the subscription begins and is charged unless cancelled at least 24 hours before the trial ends.
  • Payment is charged to your store account at confirmation of purchase. The subscription renews automatically at the end of each period unless you cancel at least 24 hours before it ends.
  • You can manage or cancel a subscription in your store account settings at any time. Cancelling stops future renewals; it does not refund the current period.
  • If a subscription lapses, paid features lock again but nothing you entered is deleted, and where the app offers export, you can still export your data.
07

Our software is a tool, not a record

Our apps are tools. They work on what you give them, whether that is entries you type or files and photos already on your device, using the rules each app describes. Unless we say otherwise in writing, an app of ours is not an official record, a filing, a certification, or a substitute for any record you are required to keep under any law or regulation.

  • Every status, deadline, expiry, due date, warning and suggestion an app shows is informational. It is worked out from the data the app can see, using the rules the app implements, and may be incomplete, out of date, or wrong for your situation.
  • You remain responsible for meeting your own legal and regulatory obligations, by reference to the rules that apply to you and to your official records. Where an app says a requirement is met, treat it as a prompt to verify, not as a determination.
  • Changes happen on your say-so. Where an app can delete, move or change something on your device, it does so only when you tell it to, and you are responsible for what you choose. Keep a backup of anything you cannot afford to lose: once something is permanently deleted, neither we nor the app can bring it back.
  • Nothing in our apps is legal, tax, financial, medical, safety or professional advice of any kind.
08

Figures and estimates

Costs, rates, projections, reserves, breakevens, variances, settlements and every other calculated figure in our apps are derived from what you enter and from the assumptions the app describes. They are estimates for your own planning. They are not accounting, tax, investment or financial advice, and you should not rely on them for tax filings, legal disputes, or agreements with other people without checking them.

09

The apps these terms cover

These Terms cover every app DosSantos Systems LLC publishes under its own name, on any platform, from the day it is released, including one that has not been added to this list yet. Today they are:

  • PlaneCost: Track Airplane Cost, for iPhone and iPad: tracks what an airplane costs to own and fly, per hour. Annex A.
  • Sweep: The Screenshot Cleaner, for iPhone: clears out old screenshots. Annex B, and its page on this site.
  • Payday Away: The Countdown App, for iPhone: counts down to your next payday in widgets. Annex C, and its page on this site.
  • Tucked In, for iPhone and Apple Watch: hands a babysitter, pet sitter or house sitter what they need for a visit, and lets parents follow along. Annex D, and its own website.
  • Just Invoices, for iPhone: logs the work you do for clients, sends your invoices and shows who still owes you. Annex E, and its page on this site.
  • Pet Papers, for iPhone and iPad: keeps your pets' vaccine records, certificates and care details, and shares them with a kennel, groomer or vet through an encrypted link or a PDF. Annex F, and its page on this site.
  • ClearSky: Airport METAR Widget, for iPhone and iPad: shows live airport weather, METAR and TAF reports, in widgets. Annex G.
  • Color Cam: The Color Finder, for iPhone and iPad: finds the colors in your photos. The general rules cover it, with no annex.
  • Hexponents: Daily Math Puzzle, for iPhone, iPad and the web: a daily logic puzzle on a hexagonal grid. Annex H, and its own website.
  • Palette Party: Color Match, for iPhone and iPad: a game that tests how well you see color. Annex I.
  • It's Just Blackjack, for iPhone and iPad: a casino-style Blackjack game played with virtual credits. Annex J.

Where an app needs terms beyond the sections above, it has a lettered annex at the end of this page. An annex adds to the sections above and, where the two differ, governs for that app. An app without an annex is governed by the sections above alone.

10

Your data and your responsibilities

  • Everything you enter is yours. We claim no rights in it, and, as described in our Privacy Policy, our apps do not send it to us, except where an app's annex says otherwise (today, Tucked In's live features, Pet Papers' share links and Hexponents' accounts).
  • You are responsible for the accuracy of what you enter, for keeping your device and store account secure, and for backups. Where an app offers sync through your own platform account, that is how you keep a copy beyond one device; exporting your data is another.
  • If you enter information about other people, you are responsible for having their permission.
11

Client engagements

If you engage us to build, run or host software, the agreement we sign for that project governs it — scope, price, timeline, ownership of what we make, confidentiality, warranties, support and everything else. This page does not replace it, cut it down, or add to it.

Two things hold in any case. We treat what you show us in confidence, whether or not a separate agreement says so. And how we handle personal data in your systems is described in our Privacy Policy — in short, it is yours, we act on your instructions, and we do not use it for anything else.

12

Acceptable use

You agree not to copy, modify, distribute, sell or lease any part of the Services; not to reverse engineer or attempt to extract source code except to the extent the law expressly allows; not to circumvent or interfere with subscription checks, rate limits or any other protective measure; not to use the Services to store or transmit anything unlawful; and not to use them for anything unlawful.

13

Intellectual property

The Services — our apps, this website, the DosSantos Systems name, the names of our apps, and their designs and content — are owned by DosSantos Systems LLC and protected by copyright, trademark and other laws. These Terms give you a license to use them as described; they do not transfer any ownership. Third-party components we include are used under their own licenses, which we honor and credit.

14

Third parties

Our apps rely on services provided by the platform you run them on — an app store for distribution and purchases, and the platform's own sync where an app offers it. A few also use an outside service that their annex names: Google AdMob for the ads in our free games, aviationweather.gov for ClearSky's weather reports, and Stripe and Sign in with Google for Hexponents on the web. Your use of any of these is governed by that provider's terms and privacy policy, and we are not responsible for their availability or performance. Beyond that, we keep third-party dependencies to a minimum; our Privacy Policy lists every outside service any of this touches.

15

Changes to the Services

We may add, change or remove features, and may stop offering something altogether. If we discontinue an app we will say so in advance where we reasonably can. Discontinuing an app does not delete what it stored on your device, and where an app offers export, that keeps working for as long as the app is installed. Store policies govern any refund of a purchase or subscription affected by a discontinuation.

16

Ending the agreement

You may stop using the Services at any time — for an app, by deleting it; a subscription is cancelled through your store account settings. We may suspend or end your right to use the Services if you materially breach these Terms. The sections on our software being a tool rather than a record, on figures and estimates, on intellectual property, and sections 17 through 21, survive any ending of this agreement.

17

No warranty

To the maximum extent permitted by law, the Services are provided "as is" and "as available", without warranties of any kind, whether express, implied or statutory, including implied warranties of merchantability, fitness for a particular purpose, accuracy and non-infringement. We do not warrant that the Services will be error-free or uninterrupted, or that their figures will be accurate or complete. Some jurisdictions do not allow the exclusion of certain warranties, so parts of this section may not apply to you. This section does not affect any warranty in a signed client agreement.

18

Limitation of liability

To the maximum extent permitted by law, DosSantos Systems LLC and its members, officers and contractors will not be liable for any indirect, incidental, special, consequential or punitive damages, or for any loss of data, profits or revenue, arising out of or relating to the Services, however caused, even if advised of the possibility. Our total liability for all claims relating to the Services will not exceed the greater of the amount you paid us for the Services in the twelve months before the claim arose and fifty US dollars. Liability under a signed client agreement is governed by that agreement, not by this section. Nothing in these Terms limits liability that cannot be limited by law, including for death or personal injury caused by negligence, or the statutory rights of consumers where those rights cannot be waived.

19

Indemnity

You agree to indemnify and hold harmless DosSantos Systems LLC from claims, losses and expenses, including reasonable legal fees, arising out of your breach of these Terms or your use of the Services in violation of law or of another person's rights.

20

Governing law and disputes

These Terms are governed by the laws of the Commonwealth of Massachusetts, United States, without regard to its conflict-of-laws rules. Before starting any formal proceeding, please contact us so that we can try to resolve the matter informally. Any dispute that cannot be resolved that way will be brought in the state or federal courts located in Bristol County, Massachusetts, and you and we consent to their jurisdiction. If you are a consumer in a jurisdiction whose law gives you the right to bring proceedings in your own courts or under your own law, nothing here removes that right.

21

General terms

These Terms, together with the Privacy Policy and any app store EULA, are the entire agreement between you and us about the Services — and, for client work, together with the agreement signed for that project. If any part of these Terms is held unenforceable, the rest remains in effect. You may not assign these Terms; we may assign them to a successor to our business. Our not enforcing a term is not a waiver of it.

22

Changes to these terms

We may update these Terms. We will post the new version on this page with a new effective date and, for material changes, describe them in the release notes of the product affected. Continuing to use the Services after a change takes effect means you accept the new Terms.

23

Contact

DosSantos Systems LLC · 488 Pleasant St, Unit 1A, New Bedford, MA 02740 · Sales@DosSantosSystems.com

A

Annex A: PlaneCost: Track Airplane Cost

PlaneCost tracks what an airplane costs to own and fly: fixed costs, running costs and flights, and the cost per hour they add up to. Everything above applies to it, and these specifics apply too.

Free and Premium. PlaneCost is free to download. Premium is an auto-renewable subscription, monthly or yearly, that unlocks the features the app describes. It is sold through Apple's App Store under section 06.

Its figures are estimates. Cost per hour, cost breakdowns, yearly summaries and running averages are worked out from the entries you make, and they are estimates under section 08. Check them before you quote a rate to a partner, a renter or an accountant.

It is not an aviation record. PlaneCost is not a pilot logbook, not an aircraft maintenance record, and not a substitute for any record you are required to keep under 14 CFR or any other regulation. Recording a flight or a maintenance cost in it is not an airworthiness or regulatory determination. Those stay with the pilot in command, under the regulations and the aircraft's official records.

Sharing an aircraft. PlaneCost's figures reflect the entries in your copy of the app. Agreements between you and your partners are yours to make.

Support is through its support page.

B

Annex B: Sweep: The Screenshot Cleaner

Sweep helps you find and delete old screenshots on your iPhone. Everything above applies to it, and these specifics apply too.

Price. Sweep is a one-time purchase through Apple's App Store, under section 06. There is no subscription, no in-app purchase and nothing to unlock.

Deleting is your decision. Swiping only marks a screenshot. Sweep deletes nothing until you confirm in the iOS dialog, and deleted screenshots go to Recently Deleted in Photos, where you can recover them for 30 days. After that, or once you empty Recently Deleted yourself, they are gone for good, and neither we nor Sweep can recover them. Section 07 applies: what you delete is your call, and a backup is yours to keep.

Suggestions are suggestions. Near-duplicate groups, and the shot Sweep suggests keeping in each, are worked out automatically on your iPhone and can be wrong. Look at a group before you delete from it.

Its own privacy policy. Sweep has a privacy policy of its own, which describes exactly what it does with your photos. Support is through its support page.

C

Annex C: Payday Away: The Countdown App

Payday Away counts down to your next payday in widgets on your iPhone's Home Screen, Lock Screen and StandBy. Everything above applies to it, and these specifics apply too.

Price. Payday Away is a one-time purchase through Apple's App Store, under section 06. There is no subscription, no in-app purchase and nothing to unlock.

It is a countdown. Payday Away does not connect to your bank or your employer, and it does not hold, move or send money. It works only from the schedule, and the take-home pay if you add it, that you enter.

Its dates and figures are estimates. Your employer decides when you are paid. The paydays Payday Away shows, including one it moves for a weekend or a US bank holiday, are worked out from the schedule you enter and the rules the app describes, and they can be wrong for your situation. Dollars earned so far, the percent of the pay period and its other figures are estimates under section 08. Check a date with your employer before you rely on it.

Alerts. Payday Away's alerts are scheduled by iOS on your iPhone. Your notification and Focus settings decide whether and when they appear, so do not depend on one arriving.

Its own privacy policy. Payday Away has a privacy policy of its own. Support is through its support page.

D

Annex D: Tucked In

Tucked In hands a babysitter, pet sitter or house sitter what they need for a visit through a live link, and lets parents follow the visit as it happens. Everything above applies to it, and these specifics apply too.

Its own terms. Tucked In has terms of use of its own. They add to these terms for Tucked In, and where the two differ about Tucked In, its own terms govern.

Price. The library, planning visits and printing are free. Features that need our server are Tucked In Plus, an auto-renewable subscription sold through Apple's App Store under section 06, with a free trial for eligible new subscribers. One subscription covers a household.

It uses our server. Unlike most of our apps, Tucked In's live features send what they need to a server we run, as its privacy policy and Annex D of our Privacy Policy describe.

It is not an emergency service, and we do not vet sitters. In an emergency, call 911. Alerts can be delayed or fail. You choose your sitter, and arrangements between you and your sitter, including pay, are between the two of you.

Content. Messages and photos between families and sitters must follow its terms, which have zero tolerance for objectionable content or abusive users. Report either through its support page.

E

Annex E: Just Invoices

Just Invoices helps you log the work you do for clients, send them invoices and see who still owes you. Everything above applies to it, and these specifics apply too.

Young business owners. Just Invoices is made for people starting their first business, and many of them are teenagers. If you are not yet old enough to form a binding contract where you live, a parent or guardian must accept these Terms on your behalf before you use it.

Price. Just Invoices is distributed through Apple's App Store. Anything it costs is shown there before you pay, and section 06 applies.

It makes invoices. It is not accounting or tax software. Totals, tax, discounts, what you are owed, overdue invoices and the yearly income summary are worked out from what you enter, and they are estimates under section 08. The income summary is a record for you, not a tax form, and nothing in the app is tax advice. Check your figures, and ask a tax professional what you owe.

Your invoices are between you and your clients. You decide what to charge, what an invoice or a reminder says, and who receives it. We are not a party to any invoice, and we do not collect money for you.

Payments happen elsewhere. Just Invoices does not process, hold or see payments. The payment details, links and QR code it prints on an invoice are yours. Your clients pay you through Venmo, Cash App, PayPal or Zelle, under those services' own terms, or with cash or a check. Check your payment details before you send an invoice.

Backups. Importing a backup replaces everything in the app with the backup's contents. Section 10 applies: backups are yours to keep.

Its own privacy policy. Just Invoices has a privacy policy of its own. Support is through its support page.

F

Annex F: Pet Papers

Pet Papers keeps your pets' vaccine records, certificates and care details, and shares them with a kennel, groomer or vet through an encrypted link or a PDF. Everything above applies to it, and these specifics apply too.

Its own terms. Pet Papers has terms of use of its own. They add to these terms for Pet Papers, and where the two differ about Pet Papers, its own terms govern.

Price. Pet Papers is a one-time purchase through Apple's App Store, and section 06 applies.

It is not veterinary advice. Due dates, reminders and statuses are worked out from the dates you enter and common schedules, and what it reads from a document can be wrong. They are estimates under section 08. Ask your veterinarian about your pet's care, and a kennel, groomer or clinic what it requires.

Share links use our server. A share link stores an encrypted copy of what you chose on a server we run, which we cannot read, as its privacy policy and Annex F of our Privacy Policy describe. Anyone who has the full link can open it until you turn it off, and a PDF you sent is a separate file that turning off a link does not recall.

Its own privacy policy. Pet Papers has a privacy policy of its own. Support is through its support page.

G

Annex G: ClearSky: Airport METAR Widget

ClearSky shows live airport weather, METAR and TAF reports for the airports you choose, in widgets. Everything above applies to it, and these specifics apply too.

It is not an official weather briefing. ClearSky shows reports as it receives them, and they can be late, missing, incomplete or wrong. It does not replace an official preflight weather briefing or flight planning. Before any flight, the pilot in command is responsible for getting all available information, under the regulations that apply to them.

Price. Anything ClearSky costs is shown in Apple's App Store before you pay, and section 06 applies.

Its own privacy policy. ClearSky has a privacy policy of its own. Support is through its support page.

H

Annex H: Hexponents: Daily Math Puzzle

Hexponents is a daily logic puzzle, in the app and on the web. Everything above applies to it, and these specifics apply too.

Its own terms. Hexponents has terms of service of its own. They add to these terms for Hexponents, and where the two differ about Hexponents, its own terms govern.

Accounts, Premium and hints. Hexponents has accounts, for people 13 and older. Premium is an auto-renewable subscription and hint packs are one-time purchases. In the app they are sold through Apple's App Store under section 06, and on the web through Stripe.

Buying on the web. On the web we sell Premium and hint packs ourselves, with Stripe taking the payment, so section 06's app store rules do not apply to those purchases. You cancel web Premium in your Hexponents account, it stays active until the end of the period you paid for, and a refund for a web purchase is something you ask us for through its support page. Its own terms set out the details.

It uses our server. Your account and gameplay are kept on a server we run, as its privacy policy and Annex H of our Privacy Policy describe.

Ads. The iPhone and iPad app shows ads from Google AdMob unless you have Premium.

I

Annex I: Palette Party: Color Match

Palette Party is a game that tests how well you see color. Everything above applies to it, and these specifics apply too.

Ads. Palette Party is free to play and shows ads from Google AdMob. The Remove Ads in-app purchase, sold through Apple's App Store under section 06, turns them off.

Support is through its support page.

J

Annex J: It's Just Blackjack

It's Just Blackjack is a casino-style Blackjack game. Everything above applies to it, and these specifics apply too.

Virtual credits only. It is played with virtual credits. They have no cash value, cannot be bought, and cannot be exchanged for money, prizes or anything else of value. It is not real-money gambling, and how you do in the game says nothing about how you would do at a real table.

Earning credits. You start with a bank of credits and can earn more each day, or by choosing to watch an optional rewarded ad from Google AdMob.

Learning features. Its strategy charts and card counting are there to help you learn the game. They are not advice about real-money gambling.

Its own privacy policy. It's Just Blackjack has a privacy policy of its own. Support is through its support page.