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Nasu - Privacy Policy

Last Updated: August 21, 2026

Nasu is a privacy-focused audio transcription app that processes everything on your device. We are committed to protecting your privacy and to being transparent about exactly what the app does with your data.

The short version

  • Zebel collects no data through Nasu. The App Store privacy label is "Data Not Collected."
  • All AI processing — transcription, speaker identification, voice profiles, summaries, titles, and SOAP/DAP note drafts — happens on your device. We do not operate any servers that receive your audio, transcripts, notes, or voice data.
  • There are no accounts, no ads, no analytics SDK, and no crash-reporting or tracking SDKs.
  • iCloud sync is off by default. If you turn it on, your data is stored in your personal iCloud account and handled by Apple (details below).

On-device processing

Your audio recordings, transcriptions, speaker labels, voice profiles, summaries, titles, and clinical note drafts (SOAP and DAP, when you use Nasu Pro):

  • Are processed exclusively on your device by locally-running models
  • Are never uploaded to our servers or to any third-party AI service
  • Are not used to train any models

Summaries, titles, tag suggestions, and clinical note drafts on supported devices use Apple Intelligence (Apple's on-device Foundation Models). This also runs on your device as part of the operating system. Notes are generated only when you ask, never automatically, and you review them before they become the record.

Voice profiles (speaker recognition)

If you choose to save a voice profile so Nasu can recognize a person in future recordings:

  • A profile is only saved after an explicit consent step — the app requires you to confirm the person has been informed and agrees
  • Profiles are numeric voice signatures, not audio recordings, and are encrypted with a key stored in your iCloud Keychain — end-to-end encrypted, so neither we nor Apple can read them
  • You can delete a person at any time; deletion removes their profile and every stored voice sample
  • Speaker labeling works without saving any voice profile — profiles are strictly optional

Network access and model downloads

Nasu downloads AI models (speech recognition and speaker identification) when you first use the corresponding feature. Models are fetched from Hugging Face's content delivery network as one-way downloads — no user data, audio, or text is ever sent. After download, the models are stored locally and the features work completely offline.

Purchases (Nasu Unlock and Nasu Pro) are processed by Apple through the App Store. Opening this privacy policy, the terms of use, or a support link leaves the app and is handled by your browser.

Purchases

Nasu Unlock (one-time) and Nasu Pro (auto-renewing subscription) are processed by Apple through the App Store. Zebel does not receive or store payment-card details. The app reads Apple's signed transaction status to determine which features are unlocked. Apple's handling of App Store transactions is covered by Apple's Privacy Policy.

iCloud sync (optional, off by default)

By default, everything is stored only on your device. If you enable Settings → iCloud Sync:

  • Your recordings, transcripts, and notes are stored in the private database of your personal iCloud account, so they can sync across your devices
  • That data is then handled by Apple on Apple's servers, under Apple's iCloud terms and Apple's Privacy Policy — Apple encrypts it in transit and at rest
  • Voice profiles remain end-to-end encrypted with a key that only your devices hold, even when synced
  • We (Zebel) never gain access to any of it — synced or not
  • You can turn sync off at any time

Data storage and deletion

Your data is stored on your device (and, only if you opted in, in your personal iCloud account). Deleting a recording, a transcript, a note, or a person's voice profile removes it from your storage; deleting the app removes all locally stored data. We hold no copies.

Children

Nasu is not directed at children and Zebel collects no data from users of any age.

Changes

If this policy changes, the date above will be updated. A material change will be reflected in the App Store privacy information before an updated app is released.

Contact

Questions about privacy: nasu [at] zebel.ai