tiktok2026-08-03
Stop timing your plunge on the phone clock
Sauna time, plunge time, rounds. Tap start. A full-screen countdown you can read across the room — warm orange for the heat, icy blue for the cold. 🔥🧊
← Tundra IndustriesKailua-Kona, HI
The easiest way to time contrast therapy: set your sauna duration, cold plunge duration, and rounds. Tap start. That's it. The first Tundra app — the one that started it all.
Palette
Night#1C2030
Ice & Fire#FFFFFF
Screens
A week of content
Straight from the factory's content calendar — what actually goes out for this app.
instagram2026-08-03
You know which phase you're in at a glance
Warm orange means sauna. Icy blue means cold plunge. Big digits, the screen stays awake, and a haptic buzz the second each phase ends. No squinting, no guessing. 🔥🧊
reddit2026-08-03
Made a dead-simple contrast timer because every other one wanted an account
All I wanted was sauna minutes, plunge minutes, and how many rounds — then tap start. No login, no ads, nothing collected. Set 1–10 rounds and it alarms plus buzzes at each switch. r/Sauna
tiktok2026-08-04
Ready to get out early? Skip ahead.
Cold got the better of you before the timer did? Tap to skip to the next phase. It still tracks your total session time at the end. 🧊➡️🔥
instagram2026-08-04
It buzzes even when your screen's off
Eyes closed in the sauna, phone face-down by the plunge — background notifications and an alarm still tell you when to switch. You never have to watch the clock. ⏱️
reddit2026-08-04
How I run my sauna/cold rounds without touching my phone mid-session
Set the two durations and the number of rounds up front, hit start, put the phone down. Alarm and haptics at every phase change, total time logged at the end. That's the whole app. r/coldplunge
tiktok2026-08-05
Set it once. Run your rounds.
1 to 10 rounds, your durations, one tap. The first app Tundra ever shipped — still the simplest way to time contrast therapy. 🔥🧊
Milestones
- Feb 25Contrast Timer 1.0 launched on the App Store