Privacy Policy
Last updated: 29 June 2026
Tentaco is built privacy-first. There are no accounts and no sign-up. Most tools run entirely in your browser — the data you paste or generate never leaves your device.
Controller
Tentaco is operated by Daniel Kuhlbarsch, Olvenstedter Grund 2, 39130 Magdeburg. Email: daniel.kuhlbarsch@outlook.de, phone: 0152 05939006.
What we collect
We do not require personal data and there is no registration. To improve Tentaco, we use privacy-friendly website analytics (see below). Contents processed in local tools are not stored on our servers.
Local browser storage
Favourites, recent tools, text snippets, tool collections, theme settings and assistant history are stored in your browser’s localStorage, sessionStorage or IndexedDB. This data stays on your device.
File exchange (optional)
If you use File exchange, you upload a file to our server to receive a temporary download link. We store the file name, size, MIME type and the file itself. Files are automatically deleted after at most 6 hours. We do not analyse file contents.
Optional cloud assistant
By default the Tentaco assistant runs fully locally — your questions never leave your device. If you enable cloud mode, we send your query to OpenAI (USA) for better answers. Only enable cloud if you agree. OPENAI_API_KEY belongs on the server only, never in the browser.
Website analytics (Umami)
We use Umami Analytics (cloud.umami.is, operated by Umami Software Inc.) to measure aggregated page views — for example which tools and studios are popular. Umami does not use advertising cookies, does not create user profiles for ad targeting, and does not store full IP addresses. Typical data: visited URL, referrer, browser type, operating system, device type and coarse region. Legal basis: Art. 6(1)(f) GDPR (legitimate interest in operating and improving the service). You can object at any time (Art. 21 GDPR) or block the script with a browser extension / disable JavaScript. Privacy information from Umami: https://umami.is/privacy-policy
Cookies
We do not use advertising or cross-site tracking cookies. Umami analytics works without marketing cookies. Optional additional analytics (Plausible, Google Analytics) load only if separately enabled on the server. Essential cookies may be set for language preference (NEXT_LOCALE) and similar site functions.
Voluntary support
You can support Tentaco voluntarily via Ko-fi (ko-fi.com). Payments are processed by Ko-fi; we do not receive or store your payment card details.
Your rights
You have rights under the GDPR (see our GDPR page). You can clear browser data yourself anytime. For server-stored files or other privacy requests contact us at daniel.kuhlbarsch@outlook.de or 0152 05939006.
Contact
Privacy enquiries to Daniel Kuhlbarsch: daniel.kuhlbarsch@outlook.de, 0152 05939006.