Didier Fuentes
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Huginn – Privacy Policy

Last updated: July 2026

Huginn is developed by Didier Fuentes. This Privacy Policy explains what Huginn does with your information.

The Short Version

Huginn reads your Gmail on your iPhone, classifies it with a language model running on the device, and sends none of it to any server we operate. There is no account to create, no analytics, and no tracking. We never see your email.

Information We Collect

We collect nothing. Huginn has no backend. There is no server that receives your email, your categories, your corrections, or any record of how you use the app.

Huginn accesses your Gmail directly from your device using the Gmail REST API over OAuth 2.0. The app requests a single scope, gmail.modify, which allows it to read your messages and change their labels — for example marking as read, archiving, starring, or applying a label. No broader access is requested, and the app cannot send email on your behalf.

Authentication happens in a Google-hosted web sheet. Huginn never sees your Google password; it only receives and stores the access tokens Google issues.

On-Device Processing

Everything Huginn understands about your email, it works out on your phone:

  • Classification, summarization and field extraction run on Apple Foundation Models, or on a Qwen3 model executed locally through MLX — whichever you select in Settings.
  • The learning signals built from your corrections — sender history, message patterns and recent examples — are computed and stored locally.

Your email content is never transmitted to us or to any third-party inference service. If you choose the Qwen3 backend, the model weights are downloaded once from Hugging Face; that request carries no information about you, your account, or your mail.

Data Storage

Everything Huginn keeps is on your device:

  • Email data is cached locally so the review queue works quickly.
  • Authentication tokens are stored in the iOS Keychain.
  • Categories, actions, extracted fields and learning history are stored in a local database.
  • Downloaded model weights are stored in the app's own storage.

Deleting the app removes all of it. You can revoke Huginn's access to your Gmail at any time from your Google Account's security settings, independently of the app.

Third-Party Services

Huginn contains no analytics, crash-reporting, advertising or attribution SDKs. The only network connections it makes are:

  • Google — OAuth 2.0 sign-in and the Gmail API, to read and label the mail you asked it to manage. Governed by the Google Privacy Policy.
  • Hugging Face — a one-time download of model weights, only if you select the Qwen3 backend. Governed by the Hugging Face Privacy Policy.

Google API Services — Limited Use

Huginn's use of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements. Specifically: data obtained from Google APIs is used only to provide the user-facing features described above, is never transferred to others except as required to provide those features or to comply with law, is never used for advertising, and is never read by humans except with your explicit consent, for security purposes, or as required by law.

Because all processing happens on your device, no Google user data is ever transferred to Huginn's developer in the first place.

Permissions

Huginn asks for two optional iOS permissions, and only when you configure an action that needs one:

  • Notifications — if a category is set to notify you.
  • Reminders — if a category is set to add items to Apple Reminders.

Declining either only disables that action. Reminders created by Huginn live in your own Reminders app; we have no access to them.

Tracking

Huginn does not track you across apps or websites, does not use your data for targeted advertising, and does not sell, rent, or share your data. There is nothing to sell — we don't have it.

Children's Privacy

Huginn is not directed at children under the age of 13 and does not knowingly collect data from children.

Changes to This Policy

We may update this Privacy Policy as the app changes. The "last updated" date above always reflects the current version.

Contact

Questions about this policy: [email protected]

By using Huginn, you agree to this Privacy Policy.