One app. One honest price.

No. It's a single one-time CHF 29 payment through Stripe — no recurring charge, no card kept on file by nüchtern, no account to manage.

Seven things: your complete fasting history in the Journey tab (Free shows your last 6 fasts; Pro shows all of them, no cap), custom goal lengths — set any goal from 1–168 hours instead of picking from the 8 presets, Keep screen awake, so the dial stays glanceable without the screen dimming while a fast runs, backup & recovery — full export and import are free for everyone, because carrying your own data to a new phone or browser shouldn't cost anything; Pro adds a rolling 40-day on-device snapshot, so an accidental reset can be undone without having a file to hand, Mood Check-in's full breathing library & pattern view — Free's daily check-in stays complete either way, and so does its guided breathing pause: the physiological sigh, one minute. Pro opens the other four patterns plus a custom builder, the three- and five-minute pauses, optional tones and vibration, and a visual pattern of how you've been feeling over time, Fast Together's friend cap raised from 4 to 8, and 15 additional themes across the Swiss, Sport, Calm and World collections in Settings → Themes (tap any of them to preview instantly, before you buy). Everything else in the app is identical on both plans.

Yes. Free is not a trial and never expires — the timer, water tracking, guides, all presets and the 2 free themes stay fully usable with no time limit and no nagging.

No. Once your license verifies on a device, it's trusted from then on — there's no expiry check and no phone-home. "Launch offer" describes the CHF 29 one-time price and duration of this promotion for new purchases, not a countdown on keys already issued: any key bought during the offer stays lifetime, even after the offer ends.

Yes — a license is a plain key you redeem, not a device-locked account, so it works wherever you enter it. There's no device limit or usage tracking to enforce otherwise; this is an honor-system, one-time-purchase model, not a subscription license server.

Check the receipt email from your Stripe checkout — your key is included there. If you still can't find it, contact [email protected] with your purchase details and it'll be sorted out directly.

A short, paced breathing exercise built into Mood Check-in — and it isn't behind the paywall. After logging how you feel, tap "Take a moment" and a calm panel guides you through slow in/out breaths with an expanding circle and a phase counter — timed entirely on its own, with no water or other data logged as a side effect. Free breathes the physiological sigh — two inhales and one long exhale, the fastest way to take the edge off a hunger wave — for one minute. Pro opens the rest of the library: box breathing, 4-7-8, coherent and humming, a custom pattern you build yourself, three- and five-minute pauses, and optional tones and vibration so the whole thing can be done with your eyes closed. That's what makes it a quick reset between tasks or a longer wind-down at night.