Legal
Subprocessors
Last updated: 20 October 2026
Draft. This page has not been reviewed yet and may change before GrammarDeck launches.
These are the companies that help us run GrammarDeck and may process personal data for us. Each one may use the data only to provide its service to us.
| Company | What they do for us | Where |
|---|---|---|
| Google Firebase | Sign-in, plan and usage records, app analytics and crash reports | United States and EU |
| DeepInfra | Runs the AI model (Qwen) that checks your text | United States |
| LanguageTool | Basic grammar and spelling checks, and the backup when the AI is slow | European Union (Germany) |
| Google Gemini | Backup AI check when the main checker is down | United States |
| Sentry | Error reports from the website and the browser extension (never the text you check) | United States |
| Vercel | Hosts this website and the service the apps talk to | United States and worldwide edge network |
| Razorpay | Payments from buyers in India | India |
| Paddle | Payments from buyers outside India (Paddle is the seller of record) | United Kingdom |
| Apple App Store and Google Play | Subscriptions bought inside the phone apps | United States |
| RevenueCat | Checks App Store and Google Play subscriptions for us | United States |
Your text and these companies
The text you check goes only to the grammar services: DeepInfra, LanguageTool and Google Gemini. They process it to return the fix, and we use them on terms that do not let them use your text to train their models. Your text never goes to any other company on this list.
Changes
When we add or replace a company, we update this page and the date at the top. Questions: privacy@grammardeck.com. See also our privacy policy.