Privacy Policy

Overview

Cipher is built with privacy as a core principle. We believe your data belongs to you — not us, not advertisers, not third parties. This policy explains what data Cipher accesses, how it’s processed, and where it’s stored.

Data We Do Not Collect

Cipher does not collect, transmit, or store any of the following:

• Personal information (name, email, phone number)
• Device identifiers or advertising IDs
• Location data
• Usage analytics or telemetry
• Voice recordings or audio files
• Transcripts or note content

We do not use any analytics SDKs, tracking pixels, or third-party data collection tools.

On-Device Processing

All core functionality in Cipher runs entirely on your device:

• Speech recognition — uses Apple’s on-device Speech framework. Audio is processed locally and never sent to any server.
• AI processing — on-device models (Gemma, Qwen, Llama) run locally without an internet connection. Your transcripts are processed on your phone and never leave it.
• Data storage — all notes, to-dos, projects, and tags are stored in secure local storage on your device.

Bring Your Own Key (BYOK) — Optional Cloud AI

Cipher offers an optional feature that lets you connect your own API key to use cloud-based AI providers. When you use this feature:

• Your transcript data is sent directly from your device to the third-party AI provider you selected (e.g., OpenAI, Google, Anthropic, DeepSeek, Groq, OpenRouter).
• Synonymy does not receive, intercept, store, or have access to this data at any point.
• Your API key is stored locally on your device and is never transmitted to Synonymy.
• You are subject to the privacy policy and terms of service of the third-party provider you choose to use.

No Account Required

Cipher does not require you to create an account, sign up, or log in. There is no authentication system, no user database, and no server-side user profiles.

Data Deletion

Since all data is stored locally on your device, you have full control over it at all times. You can delete individual notes, to-dos, or projects within the app. Uninstalling Cipher removes all app data from your device.

Children’s Privacy

Cipher does not knowingly collect any data from children under 13. Since the app does not collect any personal data from any user, no special provisions are necessary.

Changes to This Policy

We may update this Privacy Policy from time to time. Changes will be reflected on this page with an updated effective date. Since we do not collect contact information, we encourage you to review this policy periodically.

Contact

If you have questions about this Privacy Policy, contact us at hello@synonymy.studio.