Will you get down before dark — and when must you turn back?
From the sunset time where you are, plus how long the climb took and what is left, it works backward to the time you have to turn around.
US$5, bought once. Payment is handled by Gumroad. JPY pricing is planned for the future Google Play editions.
From buying it to using it offline
- Buy on Gumroad and your license key arrives in the receipt email.
- Swap that key for an unlock code at ektopos.app/redeem, then paste the code into the app.
- You need the internet only the first time (about 10–12 MB). After that it runs with no signal.
What it does
- Start from today’s sunset at your location and subtract the descent to get a turnaround time
- Estimate the return from your measured pace on the way up
- Keep a safety margin for dusk and switching to a headlamp
What it does not do
- Works offline (meant for ridgelines with no signal) · no account · one-time purchase · no tracking · no ads
- Not GPS navigation or a trail map; it does one thing — the time math — and does not route you
- It cannot model a sudden weather turn or your own state; the last call is yours on the mountain
When it helps
Day hikers and ridge walkers who do not want the turnaround time left vague