Privacy
Last updated 12 October 2026. Applies to every Walrus Machine app (Groovy Cat, thumbChord, Acordes, Espejo) and to this website.
Short version: the apps work without an account, we do not know who you are, and the little we do collect is there to find out what breaks and what gets used. You can turn it off in any app.
What we collect
Each installation gets a random identifier that is not tied to you. Under that identifier we keep:
- Anonymous usage: which screens and features you use, how long a session lasts, when something goes wrong, the app version, operating system and language. Never what you type, play or record.
- Crash reports: the technical trace of the failure, the app version, the operating system and the device model.
- Feedback you choose to send from the app: the text you write, plus the version, device and the last few technical log lines. It becomes a public report on the app’s GitHub project, so please leave personal details out of it.
- If an app offers an account and you create one, your email address, used only to sign you in and sync your data between devices. No app requires an account to work.
What we never collect
- Your name, contacts, location, or anything that identifies you, unless you create an account (see above).
- What you make: songs, recordings, MIDI performances, the chords you look up. They stay on your device, except where you ask an app to process a song and only the song link travels.
- Camera or microphone. Espejo uses your camera to draw you on screen; the image never leaves your device.
- We do not show ads, we do not sell or share data with advertisers, and we do not build profiles.
Children. Our first users are our own kids, so the apps are built to be safe for them: nothing collected can identify a person, we do not ask for age or any personal data, and there are no accounts, purchases or chats aimed at children. If you believe a child sent us personal data through the feedback form, write to us and we will delete it.
Who processes it
We are too small to run our own servers for everything, so a few services do it for us. Data is stored in the United States.
| Service | What for |
|---|---|
| PostHog | Anonymous usage analytics. |
| Sentry | Crash reports. |
| GitHub | Feedback sent from the apps becomes a public issue in the app’s repository. |
| Cloudflare | Hosts this site and routes the apps’ requests to our processing server. |
How to opt out
Every app has a switch, “Send anonymous usage data”, in its settings. Turn it off and nothing is sent, not even crash reports. The feedback form keeps working because you decide when to use it.
How long we keep it
- Usage data: up to 12 months, then it is deleted.
- Crash reports: 90 days.
- Feedback: as long as the public report exists. Ask us and we will remove it.
- Account data: until you delete the account.
Private betas
While an app is in a private beta, testers who have agreed to it may be recorded in more detail (for example, session recordings) so we can fix problems quickly. We tell each tester exactly what is recorded. This page describes the public versions.
Your rights
You can ask what we hold under your identifier, ask us to delete it, or withdraw consent at any time. Because usage data is anonymous, we may need the identifier shown in the app’s settings to find it. We answer every email.
Changes
If this page changes in a way that matters, we update the date above and say so in the apps.