StubCalcPrivacy Policy
Short version: no account, no ads, no tracking across apps or websites. Your jobs, history and settings stay on your phone. We receive anonymous crash reports, anonymous usage events (which calculator was used, never the measurements) and purchase records needed to unlock Pro. We don't sell or share personal information.
Who we are
StubCalc is run by Artem Radchenko, a sole trader based in Warsaw, Poland, who is the data controller for the processing described here. Contact: [email protected].
What stays on your phone
Everything you type into the app (measurements, bender settings, saved jobs, history, preferences) is stored only on your device. We don't receive it, except when you choose to send it to us with "Report a problem" (see below). Uninstalling the app deletes it. Phone backups (iCloud, Google) may include it under your own backup settings.
What the app sends, and why
| Data | Purpose | Processor | Kept |
|---|---|---|---|
| Crash reports: error and stack trace, app version, device model, OS version, memory state, the screens visited just before the crash. | Find and fix crashes. | Sentry (Functional Software, Inc.), EU data region (Germany). | Up to 90 days. |
| Usage events: a random ID created when the app is installed, and events such as "calculation completed" (calculator type only), paywall viewed, purchase, restore, review prompt shown, problem reported, unit system and language, plus app version, OS and device type. | Understand which features are used and where people get stuck, so we can improve the app. | PostHog, Inc., PostHog Cloud EU (Germany). IP addresses are discarded on arrival and no location is derived. | Up to 1 year. |
| Purchase records: an anonymous app user ID, product, price, currency, store transaction IDs and dates, platform, app version and country. | Unlock and restore Pro on your devices; count sales. | RevenueCat, Inc. (United States), on top of Apple App Store or Google Play billing. | While the purchase is valid, and as required by tax and accounting law. |
We never send your measurements or results with crash reports or usage events. None of this data contains your name, email or phone number, and we don't link it to you. We don't use it for advertising and the app contains no ad or tracking SDKs. Connecting to any server shows it your IP address; we don't add it to the data we keep.
Payments are processed by Apple or Google under their own privacy policies. We never see your card or payment details.
Report a problem and email
If you use "Report a problem" or email us, we receive your email address, your message and, for reports from the app, the inputs and result of the calculation you were looking at, plus app and device version. We use this only to answer you and fix the problem, and delete it within 2 years after the conversation ends. Email is hosted by Zoho Corporation.
This website
stubcalc.com uses no cookies, no analytics and no third-party scripts. It is hosted on Cloudflare Pages; Cloudflare processes your IP address and request details to deliver the pages and protect against abuse, under its own privacy policy.
Legal bases (EU/UK)
Purchase records and support messages: performance of our contract with you. Crash reports and usage events: our legitimate interest in keeping the app working and improving it, kept minimal and anonymous. You can object at any time (see below).
International transfers
Sentry and PostHog store app data in the EU. RevenueCat and Cloudflare may process data in the United States; these transfers rely on the EU-US Data Privacy Framework or the European Commission's Standard Contractual Clauses.
Your rights
Depending on where you live (for example the EU, UK, California or other US states), you can ask to access, correct or delete your data, object to or restrict processing, or receive a copy. Email [email protected]. Because app data is not linked to your name, we may need something to find it, such as the store order number of your purchase. You can also complain to a data protection authority; ours is the Polish UODO (uodo.gov.pl).
We do not sell or share personal information, as those terms are defined under California law, and we do not process sensitive personal information.
Children
The apps are tools for working tradespeople and are not directed at children under 13. We don't knowingly collect data from children.
Changes
If we change what the apps collect, we'll update this page and the effective date before the change ships, and update the App Store privacy labels and Google Play data safety form to match.