478 & Box Breathing: Slowtide

Slowtide is a calm breathing app for 4-7-8 breathing (478 breathing), box breathing and every other classic technique, and it keeps guiding you when your screen goes dark. Every classic technique is free, forever: no ads, no account, and it works offline.

WHY SLOWTIDE
Many breathing apps stop the moment the screen turns off, pause your music or podcast, or put the basic exercises behind a paywall. Slowtide was built the other way round. The guiding tones are generated live on your phone and timed to the exact sample, so they never skip or drift. The session keeps running in the background and with the screen off, and your own music or podcast keeps playing while you breathe.

10 CLASSIC TECHNIQUES, ALL FREE
• 4-7-8 breathing for winding down before sleep
• Box breathing 4-4-4-4 for calm and focus
• Coherent breathing at 5.5 breaths per minute
• Physiological sigh
• Extended exhale 4-6
• Humming for the vagus nerve 4-8
• Triangle breathing 4-4-4
• Energy 4-0-2
• Focus 4-4-6
• Ratio breathing 1-4-2

MADE FOR EYES-CLOSED BREATHING
• Keeps going with the screen off and in the background
• Your own music or podcast keeps playing, Slowtide never pauses it
• Tones generated live and timed to the sample, so they never jump
• Vibration as the beat, also with the screen off
• Your settings stay saved
• Streaks and minutes statistics
• Quick settings tile to start a session in one tap
• 2 custom patterns with 3 or 4 phases
• Breath hold test to see where you stand

HOW IT WORKS
1. Pick a technique, for example 4-7-8 breathing in bed or box breathing before a meeting.
2. Choose tones, vibration or both, and the length of the session.
3. Close your eyes or turn off the screen. Slowtide guides every inhale, hold and exhale.

SLOWTIDE PRO
Breathing stays free. Pro adds training for people who want to go further:
• CO2 tables and O2 tables for apnea training, built from your own breath hold test, with growing difficulty
• Your breath hold time over the weeks as a curve
• 4 programs: Sleep in 14 nights, Calm in 10 days, CO2 tolerance in 4 weeks, Vagus nerve reset in 7 days
• Unlimited custom patterns
• 3 more sound colors
Pro is a subscription. The yearly plan comes with a free trial.

SAFETY
Slowtide is not a medical device and does not replace medical advice. Never practise breath hold exercises in or near water, while driving or while standing. If you feel dizzy, stop and breathe normally.

PRIVACY
No account, no ads. No third-party ad or analytics SDKs, only anonymous usage counters without a device ID. Your own entries stay on your phone. The app goes online only for purchases and anonymous usage counters.

Recent changes:
- Pro page: the buy button now always stays visible at the bottom; prices show a loading state, and if Google Play can't be reached you get a "Reload" button.
- The connection to Google Play is restored automatically after an interruption; a double tap starts only one purchase.
- "Restore purchase" now tells you the real result.
- The trial reminder is only set after a confirmed trial purchase; the farewell offer appears only once.