Privacy Policy, Terms of Use and Copyright Notice — 1001 Pro Calculators and Tools
Effective 13 September 2026
Your calculations never leave your phone. Every figure you enter, every result and every record you save is processed and stored on your device. The app has no user accounts, no sign-in and no server of its own, so none of it is transmitted to us.
There is no advertising, on any tier. The app contains no advertising software, displays no adverts and requests nothing from any advertising network.
The app collects nothing about you. There is no analytics, crash reporting or usage telemetry of any kind.
1. Important notice: calculations, not advice
The calculators, worksheets and trade tools in this app perform arithmetic using published formulas and the figures you enter. Their results are estimates for general information and planning purposes only.
- Not professional advice. Nothing in the app constitutes financial, investment, tax, legal, medical, engineering, building-control or other professional advice, and it is not a substitute for advice from a suitably qualified professional who knows your circumstances.
- Not a final figure. A result is only as reliable as the inputs and assumptions behind it. Quotations, budgets, timesheets, productivity figures and material quantities produced by the app should be checked before they are relied on, issued to a customer or used for payroll, pricing or compliance.
- Rates and rules change. Tax bands, interest rates, thresholds, building standards and regulations vary by country, lender and authority, and change over time. Verify any figure you intend to act on with the body that sets it.
- Markets carry risk. Calculators that model investments, shares, options or other markets apply a formula to the figures you enter. They are not a recommendation to buy or sell anything, and past performance is not a guide to future returns.
The arithmetic is performed with exact precision and tested against published worked examples. That is a statement about the calculation, not about whether a given calculator or result is appropriate for your purpose. Decisions taken using the app remain your responsibility.
2. Information stored on your device
The app keeps the following in its own private storage on your device. It is not transmitted, and other apps cannot read it.
| Information | Purpose |
|---|---|
| Preferences | Starred calculators, category order, region, units and currency |
| Saved calculations | The figures you entered in a calculation you chose to save |
| Worksheets | Projects and quotations, budgets, timesheets and productivity plans you create |
| Business details | The letterhead and customer details you enter on a quotation |
| Site photographs | Photographs you attach to a project |
| Recent inputs and history | So a calculator reopens with the figures you last used |
| Usage allowances | The trial start date and daily counts that apply the free tier's limits |
Saved calculations store the figures you entered rather than the result, so a result is always recalculated with the current version of its calculator.
The app does not ask for your name, email address, phone number, location or contacts, and has no code that could read them. Details you type into a quotation are stored on the device and leave it only when you export or share that document.
Your device may include app data in its own backup (Google Drive on Android, iCloud on iPhone and iPad) if device backup is switched on. That is a setting of the device, not of this app.
3. Photographs
A project can hold site photographs, taken with the device's own camera app or chosen through the system photo picker, which provides only the photograph you select. A copy is kept in the app's private storage. Photographs are never uploaded, leave the device only inside a document you export, and are deleted with the project they belong to.
4. Purchases and billing
Two things can be bought: the Pro subscription, and the Trade Tools, a single one-off purchase covering every trade that includes a year of Pro. Purchases are made through the store the app was installed from, using Google Play Billing on Android and the App Store on iPhone and iPad.
Payment details are handled by Google or Apple and are never received by the app. The app is told only whether an active subscription exists for the store account, and which one-off products that account owns and when each was bought. The purchase date is used to calculate the year of Pro included with the Trade Tools.
Subscriptions are managed or cancelled in the Google Play Store, or in iOS Settings under your Apple ID and Subscriptions, according to the store that billed you. The Trade Tools purchase has nothing to cancel.
5. Permissions
The app declares no permissions of its own. It requests no internet, location, camera, microphone, contacts, photo library or storage access, and no access to information about other apps. Attaching a photograph uses the device's own camera app and the system photo picker, neither of which needs a permission.
The only permission in the released app is the store billing permission, which allows Google Play or the App Store to process a purchase. It carries no data and gives the app no access to anything on the device.
6. Sharing and exports
A result, quotation, timesheet, budget or report can be shared through the device's share sheet as a PDF, spreadsheet file, image or text, or copied to the clipboard. This happens only when you choose to do it. You choose the recipient app, and what you share is then governed by that app's privacy policy. This app keeps no copy of what is shared.
7. Retention and deletion
Information is kept on your device until you delete it in the app or uninstall the app, which removes everything the app has stored. No copy is held on any server, because the app has none, and no third party holds information collected through the app.
8. Children
The app is suitable for all ages and is not directed at children. It collects no information that could identify a user of any age.
9. Limitation of liability
The app is provided for general information and calculation purposes, on an "as is" basis. While every calculation is tested, no warranty is given that results are free of error or suitable for any particular purpose. To the fullest extent permitted by law, the developer accepts no liability for any loss or damage arising from reliance on results produced by the app. Nothing in these terms limits any right you have under consumer protection law that cannot lawfully be limited.
10. Ownership, copyright and intellectual property
10.1 Owner
1001 Pro Calculators and Tools (the "App") is owned by Afrasiyab Afrasiyab, trading as One App Company ("One App Company", "we", "us"). © 2026 One App Company. All rights reserved.
The App was designed and built independently, from the ground up, by One App Company. Every part of it described in section 10.2 is our original work and our property, and is protected by the laws of the United Kingdom and, through the Berne Convention and the TRIPS Agreement, of the other countries that are party to them.
10.2 What is protected
One App Company owns and reserves all intellectual property rights in the App, including copyright (Copyright, Designs and Patents Act 1988), database right (Copyright and Rights in Databases Regulations 1997), UK unregistered design right and supplementary unregistered design right, rights in goodwill and get-up, and rights in confidential information. Those rights cover, without limitation:
- Software. The source code and object code, the software architecture, the calculation engine and its exact-arithmetic implementation, the way each calculation is implemented, and the App's internal data structures and test material.
- The catalogue and its lists. The selection, arrangement, naming, grouping, ordering and descriptions of the 1,001 calculators; the 28 categories and the sections within them; the split between free and Pro; search terms, aliases, tags and links between related calculators; and every other list, table and collection of content in the App, which together represent a substantial investment in obtaining, verifying and presenting their contents.
- Written content. Calculator descriptions, input labels, notes, worked steps and explanations, sample and example figures, in-app messages, help text, store listing text and all other copy.
- Visual design. Screen layouts and the arrangement of elements on each screen, the answer tiles and result displays, category colours and accents, icons, illustrations and technical diagrams, charts and graphs, and the overall appearance of the App.
- Keypads and input. The design, layout, key arrangement and behaviour of every keypad and number pad, the basic, scientific and calculus pads, the tape, history, tabs and the way figures are entered and moved between boxes.
- Worksheets and trade tools. Project Maker, Budget Planner, Timesheet, the Productivity tracker, the Trade Tools and their solvers and set-outs, including their screens, steps, flows and arrangement.
- Documents and exports. The design and layout of every PDF, quotation, estimate, invoice, report, timesheet, budget, share card, image and spreadsheet export the App produces, as templates.
- Name and brand. The names "1001 Pro Calculators and Tools" and "One App Company", the App icon, logo, feature graphic, screenshots, videos and the App's distinctive get-up.
10.3 What is not claimed
Mathematical formulas, scientific and physical constants, units of measurement, published standards, tax rates and thresholds, and general ideas and methods of calculation belong to no one, and One App Company claims no exclusive right in them. Anyone may use a formula. What is protected is our own expression and work: the code, the selection and arrangement, the text, the visual design, the keypads, the worksheets, the tools and the document templates we created to present and apply them.
The App also contains open-source software components, which are used under their own licences and remain the property of their authors. Their licences are listed in the App.
10.4 Your licence to use the App
Downloading the App from Google Play or the App Store gives you a personal, non-exclusive, non-transferable and revocable licence to use it on devices you own or control, for your own personal or business purposes, subject to these terms and to the terms of the store you obtained it from. You are licensed to use the App; you do not own it or any part of it.
Your own figures and documents are yours. The figures you enter, and the quotations, reports and other documents you create for your own use and send to your own customers, may be used by you freely. The templates, layouts and designs those documents are built on remain ours.
10.5 What you may not do
Except as expressly permitted by these terms or by law, you may not, and may not help or allow anyone else to, without our prior written permission:
- copy, reproduce, republish, modify, adapt, translate or create derivative works from the App or any part of it;
- extract or re-utilise all or a substantial part of the catalogue, the categories, the lists, the descriptions or any other content, whether by scraping, screenshots, recording, transcription or any other means, including by repeated and systematic extraction of smaller parts;
- reproduce or imitate the App's visual design, screen layouts, keypads, worksheets, tools, document templates or get-up in any other app, website, product or service;
- decompile, disassemble or reverse engineer the App, except to the limited extent that section 50B of the Copyright, Designs and Patents Act 1988 permits and cannot be excluded;
- sell, rent, lend, sublicense, distribute or otherwise make the App or any part of it available to others;
- remove, obscure or alter any copyright, ownership or other notice; or
- use our names, logo, icon or any similar mark in a way that suggests an association with or endorsement by One App Company.
10.6 Infringement
Any use of the App or its contents outside the licence in section 10.4 infringes One App Company's rights. Infringement may make the person responsible, and any business behind them, liable to civil proceedings for an injunction, damages (including additional damages for flagrant infringement), an account of the profits made from the infringement, the delivery up and destruction of infringing copies, and legal costs. Certain commercial dealing in infringing copies is also a criminal offence under section 107 of the Copyright, Designs and Patents Act 1988.
One App Company monitors for copies and imitations of the App and will enforce its rights, including by sending takedown notices to app stores, hosting providers and platforms, and by bringing proceedings where necessary. To report a suspected copy, or to request permission to use any part of the App, write to hello@oneappcompany.com.
10.7 Rights reserved
All rights not expressly granted in these terms are reserved by One App Company. A delay in enforcing any right, or a decision not to act on a particular occasion, is not a waiver of that right.
11. Governing law
These terms and any dispute arising from them or from the App are governed by the laws of England and Wales, and the courts of England and Wales have jurisdiction. If you are a consumer living elsewhere, you keep the protection of any mandatory law of the country where you live, and nothing in these terms limits a right you have under consumer protection law that cannot lawfully be limited.
12. Changes to this policy
If the information the app handles or these terms change, this document will be updated before that version is released, and any new permission will be shown on the store listing. The effective date above shows when it was last revised.
13. Contact
Questions about this policy, these terms or the use of any part of the App: hello@oneappcompany.com