Privacy Policy

Last updated: August 5, 2026

1. Who we are

Languido ("we", "us") is an iPhone app that provides live, on-device interpretation and translation. This policy describes what information the app and its supporting services handle and why. Questions? Contact support@languido.ai.

2. Conversations are never stored

Languido's core job — listening, transcribing, identifying speakers, and translating — happens on your device. Conversation transcripts exist only in your phone's memory while a session is open. They are never written to disk, never uploaded to our servers, and disappear when the session ends. In offline mode, no conversation data leaves your phone at all.

3. Optional cloud features

Some optional features route data through our server so they work without any setup on your part. When you use them:

• AI translation refinement — short snippets of conversation text are sent to a large-language-model provider (such as Google, OpenAI, Anthropic, Moonshot, Zhipu, or DeepSeek) to improve translation quality. Our server relays the request and does not keep the content.
• Cloud speech recognition — when enabled, audio is streamed to Deepgram for transcription. Our server only issues short-lived (5-minute) access tokens; the audio does not pass through or get stored on our systems.
• Cloud translation and voices — text may be sent to DeepL (translation) or Fish Audio (speech synthesis) to fulfill your request.

These providers process data on our behalf to deliver the feature you invoked. You can avoid all of them by using the app offline or with on-device models — the app is fully functional that way. If you enter your own API keys in Settings, requests go directly from your device to that provider under your own agreement with them.

4. If you create an account

An account is optional — it unlocks premium models, credits, and cross-device sync. If you sign up, we store:

• Email address and optional name, used for sign-in, verification codes, and password resets (sent via SendGrid).
• Password, stored only as a salted bcrypt hash. We never see or store your actual password.
• Credit balance and transaction history — purchases, usage, and remaining balance, so we can show you where your credits went.
• Purchase records — when you buy credits or a subscription through the App Store or Stripe, we record the transaction identifier and product to grant your purchase. Payments are processed entirely by Apple or Stripe; we never see your card number.
• Learning progress — if you use the Learn tab, your course progress (streaks, levels, flashcard schedules) syncs to your account so it can be restored on a new device.
• App preferences — a small settings snapshot (under 8 KB) for cross-device restore.
• Push notification token and timezone — if you allow notifications, we store your device's push token and timezone so reminders arrive at a reasonable local hour. You can turn off streak reminders and tutor messages in Settings, or revoke notification permission entirely in iOS Settings.

Session tokens are stored in the iOS Keychain on your device and expire after 30 days.

5. What we don't do

• We do not sell or rent your personal information to anyone.
• We do not show ads and do not use third-party advertising or tracking SDKs.
• We do not use your conversations to train AI models.

6. Service providers

We rely on a small set of infrastructure providers to run the service: Heroku (application hosting), MongoDB Atlas (database), Apple (App Store payments and push notifications), Stripe (card payments), SendGrid (transactional email), and the AI providers listed in section 3 when you use cloud features. Each receives only what is necessary to perform its function.

7. Data retention and deletion

Account data is kept while your account is active. You can delete your account at any time in Settings → Account → Delete Account. Deletion is immediate and permanent: your profile, credit balances, credit history, learning progress, preferences, push tokens, and any courses you published are erased. Purchase records are retained (unlinked from your identity) as required for financial record-keeping. Local data on your device can be erased from the same screen.

8. Security

All communication between the app and our servers uses TLS. Passwords are hashed with bcrypt, session tokens are signed and time-limited, and API access is authenticated and rate-limited. No system is perfectly secure, but we design so that the most sensitive thing — your conversations — never reaches us in the first place.

9. Children

Languido is not directed at children under 13 (or the equivalent minimum age in your jurisdiction), and we do not knowingly collect personal information from them. If you believe a child has provided us personal information, contact us and we will delete it.

10. Your rights

Depending on where you live, you may have rights to access, correct, export, or delete your personal information. Most of these are available directly in the app (account screen and account deletion). For anything else, email support@languido.ai and we will respond within 30 days.

11. Changes to this policy

If we make material changes, we will update this page and revise the date at the top. Continued use of the app after changes take effect constitutes acceptance of the updated policy.