Deepline: Apnea & Freediving

Vivchar Vitaly

About this app

Find your breath. Deepline pairs a calm apnea trainer — CO2 and O2 tables plus box breathing — with a beautiful freediving logbook. Fully offline. The numbers are the heroes, and the water goes still when you hold.

Deepline is for freedivers, spearfishers and snorkelers — and for anyone who wants a quieter way to train their breath.

Train your breath hold
- CO2 and O2 apnea tables, auto-built from your personal max
- Box breathing for daily calm and pre-dive focus
- A still, high-contrast timer made for wet hands and bright sun
- The water stays motionless during every hold — nothing to distract you

Log every dive
- Depth, breath-hold time, discipline and conditions
- A GPS pin for every spot
- Your full freediving logbook, kept on your device

See your progress
- Watch your breath-hold time grow, session after session
- Personal records, kept simple

Calm by design
- A signature living-water interface, not another stopwatch
- No clutter, no noise, no emoji
- Works fully offline — no account, no sign-up, your data stays yours

How it works
1. Measure your baseline breath hold
2. Train with CO2 / O2 tables and box breathing
3. Log your dives and watch your progress deepen

Free to use. Your breath, your data, your line to the deep.

What’s new

Find your breath. Deepline is here — the calm apnea trainer and freediving logbook in one.

- CO2 and O2 tables, built from your personal max
- Box breathing for pre-dive focus
- A dive log with depth, conditions and a GPS pin
- Your breath-hold progress, session after session

Fully offline, no account — your data stays yours.