Privacy policy
Last updated: August 2026
Who we are
Callejero is a Spanish-immersion practice app. This policy describes what data the service handles and why. Questions or requests: 1:277298120287:web:1a677a526bb2461c587dea.
Account data
Sign-in is handled by Firebase Authentication (Google). We store your account identifier and email address to identify your account. We never see or store your password; Google or Firebase handles credentials.
Your learning data
The product is built on your history, so we store it in your account: conversation turns and their corrections, listening results, saved phrases and patterns, flashcards and review history, lessons and test attempts, settings, and usage metering for your plan. This data exists to run the features (for example, lessons are generated from your own logged corrections). It is never shown to other users.
Third-party processors
- Anthropic: the text you write in scenes and lookups is sent to Anthropic's Claude API to generate responses, corrections and lessons. Per Anthropic's commercial terms, API data is not used to train their models.
- Microsoft Azure: when the natural voice is enabled, the text to be spoken is sent to Azure Speech to synthesize audio. Synthesized audio is cached on our server so repeats are served without re-sending.
- Google Firebase: authentication (your email and sign-in state).
- Stripe: payment processing for paid plans, when billing is live. We never see or store your card number; Stripe handles it.
What we don't do
- No ads, no ad trackers, no selling or sharing your data for advertising.
- No training AI models on your data.
- No collection beyond what the features above need.
Retention and deletion
Your data is kept while your account exists so the app can keep building on your history. Email 1:277298120287:web:1a677a526bb2461c587dea from your account address and we will delete your account and all associated learning data. Backups roll off on their own schedule shortly after.
Changes
If this policy changes materially we will note it here with a new date.