Privacy Policy
Effective: July 3, 2026 · Last updated: September 28, 2026
1. Who we are. Northline is operated by Synthemo. This policy describes what we collect, how we use it, and the controls you have. Contact: synthemo.com/contact.
2. What we collect.
- Account: when you sign in with Google, we receive your name, email address, and profile picture.
- Profile: a preferred name and short bio, if you choose to write them. These are entirely user-authored — we don’t build a hidden profile of you.
- Conversations: your messages, transcribed audio (in voice mode), the personas’ generated responses, and the generated video and audio clips.
- Technical data: basic logs needed to run and secure the Service (timestamps, request metadata, error logs).
- Access requests: if you request access, we receive your email address, your name if you give it, and what you tell us you’d use Northline for. We also keep a one-way hash of your IP address for one day to prevent abuse. We use this only to review your request. Contact us and we’ll delete it.
3. How we use it. To operate the Service (generating persona responses requires processing your messages), to enforce safety and acceptable-use boundaries, and to fix and improve the Service. We do not show ads, and we do not sell your personal information.
4. Service providers. Generating responses requires sending conversation data to the third-party providers that power the Service: a large-language-model provider, a voice-synthesis provider, a speech-to-text provider, a real-time avatar rendering provider and a real-time media provider (avatar mode), an email-delivery provider (to notify us of access requests), a video-hosting provider (it streams the videos on our landing page and receives your IP address and basic playback data when you watch), and our database, storage, and hosting providers. These providers process data on our behalf and retain it according to their own policies; we choose providers with standard commercial data-protection terms.
5. Memory. Persona memory is on by default — personas remember what you tell them across conversations, so they know you the next time you talk. You can turn it off at any time in Settings, and everything a persona remembers is visible to you there. How it works:
- What is remembered: only facts you actually stated in conversation. Personas do not record inferences, impressions, or anything you didn’t say. Certain topics are never captured even if stated, including health and medical information, therapy-adjacent emotional content, romantic or sexual content, financial specifics, and sensitive facts about other people.
- Per-persona scoping: what you tell one persona stays with that persona. A memory becomes visible to another persona only if you tell that persona yourself, or if you choose to share it across personas in Settings. Moments between you and a specific persona are always persona-bound and cannot be shared.
- Visibility: every memory is listed in Settings alongside the words it was captured from. There is no hidden profile.
- Deletion: delete any memory, or all of them, anytime in Settings. Deleting a conversation also deletes any memory that has no other conversation supporting it — a memory does not outlive its last source. Asking a persona to forget something removes it.
- Fading: dated or time-bound memories — events, plans, ongoing projects — fade with time: personas stop referencing them, and you can restore or delete them in Settings.
- Turning memory off immediately stops both remembering and the use of existing memories. Stored memories remain visible in Settings until you delete them.
6. Deletion and retention. When you delete a conversation, it is deleted immediately and permanently from our systems — the conversation, its turns, and its generated media are removed in the same operation. Honest caveats: our database keeps short-window backups that age out automatically; in rare failure cases a stored media file may briefly outlive its deleted conversation before cleanup; and service providers (section 4) retain data per their own policies. We retain account data while your account is active. To delete your account entirely, contact us via synthemo.com/contact and we will process the request within 30 days.
7. California privacy rights. If you are a California resident, you have the right to know what personal information we collect (this policy), to request deletion, and to not be discriminated against for exercising these rights. We do not sell or share personal information for cross-context behavioral advertising. To exercise rights, contact us via synthemo.com/contact.
8. Children. The Service is not directed to children under 13, and we do not knowingly collect personal information from them. If you believe a child under 13 has used the Service, contact us and we will delete the data.
9. Security. We use reasonable safeguards — authenticated access, encryption in transit, and access controls — to protect your data. No system is perfectly secure, and we cannot guarantee absolute security.
10. Changes. We may update this policy as the Service evolves. Material changes will be noticed in the app. Continued use after changes take effect constitutes acceptance.