Terms of Use

1Provider and scope

These Terms govern the Android app Oatpendant, provided by Zydeno. Contact [email protected] with any question about them. The Privacy Policy explains what stays on your device, how optional location and reminders work, what you can export and how support e-mails are handled.

2Agreement to these terms

These Terms of Use (“Terms”) are a legal agreement between you and Zydeno, the developer of Oatpendant (“we”, “us”). They apply to the Oatpendant app for Android, its updates and everything it shows or produces (together, “the app”). By installing, opening or using the app you accept these Terms. If you do not accept them, do not use the app and uninstall it.

The Privacy Policy explains how the app handles data and forms part of these Terms. If we offer optional features under additional terms in the future, for example paid features, those terms will be shown to you before you accept them and will apply together with these Terms.

You must be old enough to enter into a binding contract where you live, or use the app with the consent and supervision of a parent or guardian who accepts these Terms for you. If you use the app for an organisation, you confirm that you may accept these Terms on its behalf; the consumer-protection provisions of these Terms apply only to consumers.

3The app

Oatpendant is an offline companion for Muslim prayer. It calculates daily prayer times for a place you choose using a calculation method, Asr convention, high-latitude rule and adjustments you select; shows the qibla direction with the phone’s compass and a sun-and-moon check; shows Gregorian and Hijri dates with adjustments you can enter for your community; compares calculated times with a mosque timetable you import; keeps a quiet count (tasbih); creates monthly timetables to print or save; and can show optional reminders.

The app is a personal calculation and reference tool. It has no account, no online service, no community features and no audio of the call to prayer (adhan) or recitation. It is not affiliated with, endorsed or certified by any mosque, religious authority, government body or organisation whose calculation convention it names.

4Not professional advice; no safety-critical use

The app is a tool to help you plan and calculate. It does not give professional, engineering, legal or other expert advice, and using it does not create a professional relationship with us. You remain responsible for your inputs, for how you interpret the results and for what you decide to do.

Do not use the app as the only basis for a decision where an error could cause death, personal injury, damage to property or the environment, or legal or financial loss, and do not use it in a safety-critical system, in an emergency or to control equipment. Oatpendant is a calculation aid. It does not issue religious rulings, does not decide whether a prayer or fast is valid and does not observe the moon; conventions named after organisations are not endorsed by them.

5Licence to use the app

Subject to these Terms, we grant you a limited, personal, revocable, non-exclusive, non-transferable and non-sublicensable licence to download, install and use the app on Android devices you own or control, for your own purposes (personal prayer planning and reference, including preparing timetables for your household, mosque or community). The app is licensed to you, not sold.

Except where these Terms, an open-source licence or mandatory law allow it (for example decompiling for interoperability where the law permits), you may not: copy, modify, translate or create derivative works of the app; decompile, disassemble or reverse-engineer it; rent, lend, sell, sublicense, distribute or publish it, or make it available for use by others over a network; remove or change any copyright, trademark or legal notice; or get around any technical limit of the app, including any future purchase, licence or advertising mechanism.

Open-source components and fonts in the app are licensed under their own licences, listed in the app under About → Open-source licenses. Those licences prevail for those components, and nothing in these Terms limits the rights they give you.

6Calculation methods and religious matters

Muslims and their communities follow different conventions for the start of Fajr and Isha, for Asr, for high latitudes, for precautionary minutes and for the start of Hijri months. The app offers several published calculation conventions. Where a convention carries the name of an organisation or country, the name identifies the convention as we implement it from its published parameters; it does not mean that the organisation approved the app or that the result matches its current official timetable. Some conventions are marked as approximations because the official timetable uses local rules that the app cannot reproduce exactly. A method the app suggests for your region is only a starting point.

The calculated Hijri calendar follows an astronomical table or rule and can differ by a day or more from the date your community announces, especially at the start of Ramadan, at Eid and at the start of other months. The app lets you record an announced date; it does not tell you which announcement to follow.

7Accuracy of times, dates and direction

Calculated times depend on the place, time zone, method, adjustments and settings you choose, on the device clock and time-zone data, and on the limits of the astronomical models. Atmospheric refraction, terrain, elevation and local custom mean that the moment you observe in the sky can differ from the calculated time by several minutes. At high latitudes in some seasons, twilight-based times cannot be determined from the sky at all; the app then shows that the time is unresolved or uses the high-latitude rule you selected, and you should follow your local mosque or authority.

The qibla bearing is a calculated great-circle direction. The compass reading depends on your phone’s sensors and calibration and can be disturbed by magnets, metal, electronics, cases and vehicles. The magnetic model built into the app is valid until the end of 2029; after that the app tells you that magnetic declination may be out of date. The Sun & Moon check uses the calculated position of the sun, its shadow or the moon as a reference; whether you can see them depends on weather and your surroundings, and the moon’s calculated position does not establish crescent visibility or a calendar date.

Timetables you import, and comparisons with them, are only as accurate as the file you provide. The app shows the source you entered but does not check whether that source is current or official.

8Reminders are approximate

Reminders are optional conveniences. They use Android’s standard, inexact scheduling, so Android may deliver them minutes or, with battery restrictions, much later than planned, or not at all if notifications are blocked, the phone is off, or the device manufacturer restricts background work. The app does not play the call to prayer and does not override silent mode or Do Not Disturb. Do not rely on a reminder for the start or end of a prayer time or of a fast; check the times on screen or your mosque’s timetable.

9Safe and respectful use

• Never look directly at the sun, with or without the app, including when using the sun-and-moon check. Looking at the sun can permanently damage your eyes.
• Hold the phone flat and away from magnets and metal when using the compass, and do not use the app while driving, cycling or doing anything that needs your full attention.
• The app gives no medical or health advice. If you are unsure whether you should fast or how to pray because of illness, pregnancy, age or another condition, ask a doctor and a scholar you trust.
• Be considerate in places of worship: keep sounds and vibrations at a level that does not disturb others, for example with your phone’s silent mode and the app’s haptic and sound settings.

You are responsible for the place, method, adjustments and other settings you choose, and for checking printed or shared timetables before you give them to others.

10Your data, exports and deletion

Your places, settings, mosque data, imported timetables, counts and reminder settings are stored only on your device. We hold no copy and cannot restore lost data. Android automatic backup and device transfer are switched off, so uninstalling the app, clearing its storage, resetting or losing your phone erases the data unless you have exported a backup. Use Settings → Your data to export a complete backup, to restore one after a preview and to delete all data.

Restoring a backup replaces what is on the device; export a copy first. The app checks backups and writes changes atomically, but it cannot guarantee recovery after a device or storage failure. Backups, PDFs and CSV files are not encrypted by the app and contain your location. If you choose a cloud-backed location or a cloud or network printer, that provider is responsible for the file under its own terms. Deleting data in the app does not delete files you exported or pages you printed.

11Timetables and content you add

You can add your own text and files, such as place and mosque names, notes on sources, announced dates and timetables in CSV format. You keep any rights you have in this content and grant us no rights in it, because it never leaves your device through the app. Import and print only timetables you are allowed to use. Many mosques and authorities publish timetables under their own terms; the app does not license them to you, and a printed or exported sheet that contains someone else’s timetable must respect those terms. Do not present a sheet made with the app as an official timetable of a mosque or authority unless they have approved it.

12Third-party software, data and original content

The app uses AndroidX, Jetpack Compose, DataStore, Kotlin, kotlinx.coroutines and kotlinx.serialization under the Apache License 2.0; adapts the Adhan solar equations (MIT, Copyright 2016 Batoul Apps), Astronomy Engine (MIT, Copyright 2019–2025 Don Cross) and the HijriDate Umm al-Qura month table (MIT, Copyright Mohammed Alshehri); uses the World Magnetic Model 2025 (NOAA NCEI and British Geological Survey, public domain); and bundles a city list derived from GeoNames under the Creative Commons Attribution 4.0 licence, selected, normalised and indexed by Zydeno. The typefaces PT Root UI (Copyright ParaType) and Noto Serif, Noto Sans Arabic, Noto Sans Bengali and Noto Sans Devanagari (Copyright The Noto Project Authors) are used under the SIL Open Font License 1.1. Licence texts, attributions and data versions are available offline in Settings → About & privacy → Open-source licenses. Where an open-source licence gives you rights that differ from these Terms, the open-source licence prevails for that component. GeoNames, NOAA, the British Geological Survey and the authors of these components do not endorse the app.

The icon, illustrations, compass, layouts, interface sounds, explanations and translations are created for Oatpendant. Astronomical formulas and the numerical parameters of calculation conventions are facts and methods, not claimed as our exclusive property. No timetables, texts, logos or emblems of mosques, religious authorities or governments are bundled, and the app contains no recordings of the call to prayer or of Quran recitation. Android, Google Play, your browser, e-mail app, document provider and print service are independent products and services with their own terms; they are named only to explain how the app works.

13Acceptable use

Use the app lawfully, respectfully and in line with these Terms. Import only files you trust and have the right to use. Do not use the app, or material made with it, to insult, mock or incite hatred against any religion, school, community or person, and do not present its results as a religious ruling or as an official timetable or announcement.

14Intellectual property

The app’s original code, design, artwork, sounds and texts are protected by intellectual-property law and belong to us or our licensors. Exporting a backup, PDF or CSV gives you a copy of your own data and of the calculated times; it does not transfer rights in the app’s software, artwork or fonts. You may print and share timetables you make with the app for non-commercial community use.

15Price, payments, ads and future paid features

Current version. The current version of Oatpendant is provided free of charge, without ads and without in-app purchases or subscriptions. This describes the current version only. It is not a promise that the app, or any feature of it, will remain free of charge or free of ads.

Possible changes. We may at any time introduce advertising; offer paid features, in-app purchases, subscriptions or a paid edition; change which features are free; and set or change prices. Features that are free today may require payment in a future version. We will describe such changes in the store listing and release notes, and in the Privacy Policy where they affect data.

Purchases. Any purchase will be made through Google Play and processed by Google under the Google Play Terms of Service and its payment policies. Prices are shown in Google Play before you buy, including taxes where applicable. Subscriptions renew automatically until you cancel them in Google Play; cancelling stops future renewals. Refunds follow Google Play’s refund policies and your mandatory consumer rights, such as the right of withdrawal in the EU and the UK. Where you ask for immediate access to digital content during a withdrawal period, you may lose that right to the extent the law allows, and you will be asked to confirm this before you buy. You are charged only if you choose to buy something.

Ads. If the app shows ads, they are supplied by third parties. We are not responsible for the content of ads or for the products and services advertised, and any dealings with advertisers are between you and them.

Price changes. We may change prices for future purchases at any time. For an active subscription, we will announce a price increase as Google Play and the law require, and you can cancel before it applies.

16Disclaimer of warranties

The app, its prayer times, Hijri dates, qibla bearings, compass readings, sun-and-moon checks, mosque comparisons, reminders, quiet count, timetables, printouts, backups and other functions are provided “as is” and “as available”. We do not warrant that any calculated time, date or direction matches the sky, your community’s practice or any official timetable or announcement, that reminders will be delivered on time, that the compass is accurate on your device, or that data stored on your device will be preserved.

17Limitation of liability

To the extent permitted by law, we are not liable for any loss arising from a time, date, direction, reminder or timetable shown or produced by the app, or from a decision you or others make based on it, including a prayer performed early or late or missed, a fast started or ended at the wrong time, an observance kept on a different day from your community, a direction faced in error, or errors in timetables you print or distribute; for injury caused by looking at the sun or by using the phone while moving; for lost, corrupted or overwritten data or backups; or for reminders that are late or not delivered.

18Your rights as a consumer

If you use the app as a consumer, you benefit from the mandatory consumer-protection rules of the country where you live, and nothing in these Terms affects them. In particular:

• EU and EEA: your statutory rights, including those on the conformity of digital content and digital services under the national rules implementing Directive (EU) 2019/770 where they apply, and mandatory product-liability rules, remain unaffected.
• United Kingdom: your statutory rights, including under the Consumer Rights Act 2015, remain unaffected.
• Australia: our services come with guarantees that cannot be excluded under the Australian Consumer Law. Where the law allows us to limit our liability for failing to meet a consumer guarantee for services that are not of a kind ordinarily acquired for personal, domestic or household use, our liability is limited to supplying the services again or paying the cost of having them supplied again.
• New Zealand: if you acquire the app for business purposes, you agree that the Consumer Guarantees Act 1993 does not apply, to the extent the law permits.
• United States and Canada: some states and provinces do not allow the exclusion of implied warranties or the limitation of incidental or consequential damages, so some of the exclusions above may not apply to you. In Québec, the mandatory provisions of the Consumer Protection Act apply.

19Indemnity

To the extent permitted by law, you agree to indemnify and hold harmless the developer against claims, liabilities, damages, losses and reasonable costs, including reasonable legal fees, brought by third parties and arising out of (a) your use of the app’s results, including timetables, PDFs and printouts you give to a mosque, community or other people, and the timetables, names and other content you import or add, (b) your breach of these Terms, (c) your violation of any law or of the rights of others, or (d) output of the app that you provide to another person, such as a client or employer. This does not apply to the extent a claim is caused by our own breach of these Terms or our negligence, or where local consumer law does not allow it.

20Changes, availability and termination

To the extent the law allows, we may change, update, add or remove features, change data sources, and suspend or discontinue the app, in whole or in part or in any country, at any time. We are not obliged to provide updates, maintenance or support, except where mandatory consumer law requires updates to keep the app in conformity.

You may stop using the app at any time by uninstalling it. Your licence ends automatically if you materially breach these Terms, and we may end or suspend it where the law requires. When it ends, you must stop using the app and uninstall it. Your data stays on your device under your control, so export what you need first.

Provisions that by their nature should continue after these Terms end continue to apply, including those on intellectual property, disclaimers, limitation of liability, indemnity, governing law and general provisions.

21Google Play

You obtain the app through Google Play. Your download, and any purchase you make, is also governed by the Google Play Terms of Service and Google’s policies. Where these Terms conflict with Google Play’s terms on the distribution, billing, refunds or licensing of apps obtained from Google Play, Google Play’s terms prevail to the extent of that conflict.

These Terms are between you and the developer only, not Google. Google is not responsible for the app or its content and has no obligation to provide maintenance or support for it. Android and Google Play are trademarks of Google LLC.

22Governing law and disputes

These Terms, and any dispute or claim arising out of or in connection with them or the app, including non-contractual disputes, are governed by the law of the country in which the developer is established, without regard to its conflict-of-laws rules. The United Nations Convention on Contracts for the International Sale of Goods does not apply.

The courts competent for the place where the developer is established have jurisdiction. If you are a consumer, you keep the protection of the mandatory provisions of the law of your country of residence, and you may bring proceedings in the courts of that country where that law allows it.

Before starting formal proceedings, please write to [email protected] and give us at least 30 days to try to resolve the issue informally. This does not affect any time limit that applies to you by law or your right to use an alternative dispute-resolution body available to consumers in your country.

23General provisions

• Entire agreement. These Terms, the Privacy Policy and any additional terms you accept for optional features are the entire agreement between you and us about the app.
• Severability. If a provision is found invalid or unenforceable, it applies to the maximum extent permitted and the rest remains in effect.
• No waiver. Not enforcing a provision is not a waiver of the right to enforce it later.
• Assignment. You may not transfer your rights or obligations under these Terms. We may transfer ours, for example together with the app to another developer; where the law requires, this will not reduce your rights as a consumer.
• Events beyond our control. We are not responsible for failure or delay caused by events beyond our reasonable control, such as outages of networks, devices or third-party services, natural disasters or acts of authorities.
• Export and sanctions. You agree to use the app in compliance with applicable export-control and sanctions laws.
• No third-party rights. No one other than you and us may enforce these Terms.
• Notices. We may give notices in the app, in its store listing or release notes, or on this page. You can send notices to [email protected].
• Language. These Terms are written in English, which is the binding version. A translation, if offered, is for convenience only, unless the law of your country requires otherwise.

24Changes to these terms

We may update these Terms, for example when we change the app, introduce ads or paid features (§15), or when the law changes. The effective date and version at the top of this page show which version applies, and the version history (§25) summarises the changes.

For material changes we give reasonable notice before they take effect, for example in the release notes or in the app. If you keep using the app after the changes take effect, you accept the updated Terms; if you do not agree, stop using the app and uninstall it. Changes do not apply to disputes that arose before they took effect.

25Version history

26Contact

• Developer: Zydeno, the developer of Oatpendant on Google Play
• E-mail: [email protected]
• Website: zydeno.com

See also the Privacy Policy.