Support

FAQ

What do I need to use Circa?

A Google Fitbit Air tracker paired with your Google account, and an iPhone running iOS 17 or later. Circa reads the Air's data through the Google Health API, and there is no separate Circa account.

Why are my scores empty on day one?

The Air is listening. First baselines form after 3 nights. Until then the halo, sub-scores and forecast show their collecting states, which is by design and not a bug. Circa never shows you statistics it hasn't earned.

When do insights unlock?

Each insight has a minimum number of nights (typically 20) and requires ≥80% log completeness in its window. Until then its card shows progress, e.g. "collecting · 9 of 20 nights needed." Insights that fail their confidence interval for 14 consecutive days are retired automatically.

How does the Tonight forecast work?

A transparent linear driver model: caffeine at bedtime, late nicotine, evening stack, zone minutes and sleep debt each contribute a signed amount you can inspect. It starts with sensible coefficients and re-fits to your own nights (ridge regression) once 30 nights exist. It recomputes on every log.

What is demo mode?

A synthetic persona with pre-seeded numbers so you can explore the full app without connecting an account. It is clearly badged "demo data" and fully wiped when you exit.

How do I export my data?

Profile → Export all data. You get a CSV of every intake plus a complete JSON dump (settings, stack, daily metrics, insights, raw datapoints) via the share sheet.

Widget and Siri logging

Add the Circa widget to your Home or Lock Screen for one-tap logging of your three most frequent intakes. Or say "Log an espresso in Circa" to Siri.

Sync seems stale

Pull down to refresh on any tab. In the background, iOS allows Circa to refresh roughly every 15 to 30 minutes, matching the band's own sync cadence. If the band hasn't synced to Google Health, Circa can't see new data yet.

Why do I see ads, and how do I change my ad consent?

Circa is free and has no in-app purchase, so advertising is what pays for it. There is a banner above the tab bar on the today, body and signals tabs, and a capped full screen ad that can follow once you have saved an intake. Nothing inside the app removes the ads, because there is nothing to buy. What you can change is your consent: open the profile from the corona mark at the top left, scroll to About and choose Ad privacy settings to reopen Google's consent form. Your sleep, HRV, activity and intake log are never handed to the advertising kit. The full detail, including the provider and the legal basis, is in the Privacy Policy.

Account deletion

This website

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Contact

levin.schwab@gmx.de