Privacy policy
RecoLingo records the English conversations you choose to record, turns them into a transcript, and gives you feedback. This notice explains what we collect to do that, who helps us, and how you can delete it.
Effective date: September 28, 2026 · Published by HINODE GIKEN K.K.
Your account
You sign in with Apple or Google. Sign-in is handled by Firebase Authentication. We then store a small profile for your account: your name, email address, profile photo link (if your sign-in provider shares one), and the date you joined.
Your recordings
The app uses your microphone only while you are recording a conversation. When you finish, the audio is uploaded to our cloud storage through a short-lived upload link.
For each recording we store its title and category, when it was recorded, how long it is, the audio file and its size, the transcript, the feedback, and its processing status.
How feedback is made
After upload, a speech-to-text service fetches the audio through a link that expires after 15 minutes and returns a transcript, including word timings and how confident it is about each word. We send that transcript to an AI model, which generates pronunciation, grammar, vocabulary and phrasing feedback. The result is saved with your recording so you can come back to it.
Recording other people
Conversations usually include other people. Only record a conversation when everyone present has agreed to be recorded.
Service providers
These companies process data on our behalf, only to provide RecoLingo:
- Google (Firebase Authentication, Cloud Firestore, Cloud Storage, and Cloud Tasks), to sign you in and store your profile, recordings, transcripts and feedback.
- Deepgram, to turn your audio into a transcript.
- OpenAI, to generate feedback from your transcript.
- Apple and Google, for Sign in with Apple and Google Sign-In.
- Vercel, to host this website and run our servers.
- Stripe, to process RecoLingo Pro subscription payments. Stripe collects your card details directly; we only store your Stripe customer and subscription IDs and your plan status.
We do not sell personal information or show ads, and the app contains no advertising or analytics tools.
On your device
The app saves one small flag on your device to remember that you finished onboarding. Firebase Authentication also keeps your sign-in session on the device so you stay signed in. Signing out ends that session, and removing the app clears both.
Keeping and deleting your data
We keep each recording, its transcript, and its feedback until you delete the recording or delete your account.
You can delete any recording in the app. This permanently removes the audio file, the transcript, and the feedback.
To delete your account and all of its data, go to Profile → Delete account in the app. This permanently deletes your profile, your sign-in, and every recording, transcript, and piece of feedback linked to it, and cancels any RecoLingo Pro subscription. Your billing history stays with Stripe, under its own privacy policy. You can also email koka@hinodetech.jp and we will delete your account for you.
Website visits
This website does not ask you to create an account and has no contact form, advertising pixels, analytics, or cookies. Our web host may process basic connection details, such as your IP address and browser type, to deliver and protect the site.
Children
RecoLingo is not directed to children under 13 and is not designed to collect their personal information. If you believe a child has sent us personal information, please contact us and we will delete it.
Changes and contact
We will update this notice when the app changes how it uses your information. The current version and effective date will always appear on this page.
Privacy questions: koka@hinodetech.jp · HINODE GIKEN K.K.