Kelvin: Cold Plunge Tracker

Adelyons LLC

In-app purchases

About this app

Kelvin is a hardware-agnostic cold-exposure tracker — a gorgeous plunge timer, a session log with history and streaks, a breathwork trainer, and adaptation insights. Not a tub remote. Works with ANY cold source — ice bath, cold shower, lake, or chest-freezer tub. Kelvin owns the practice, not the tub.

Master the cold — on any tub, shower, or lake. Every second in the cold, counted.

WHY PLUNGERS CHOOSE KELVIN
• A real timer, log and history that actually work — on Android. Breath-up rounds, a plunge countdown with a first-30s cold-shock breathing coach, and a guided warm-up. The category leader still can't log a session on Android; Kelvin is built Android-first.
• Works with any cold source — no hardware, no pairing, no 2.4GHz router, no $5,000 tub. Ice bath, shower, lake, stock-tank, freezer: pick a source and start.
• Safety guardrails the whole category ignores — cold-shock and afterdrop guidance, a sensible exposure ramp, contraindication warnings, and a hard lock on breath-holds in or before water. Free, and never paywalled.
• Works offline, opens instantly — local-first, no account, nothing to crash. Works at a frozen lake with no signal.

FREE FOREVER
• The Plunge timer: breath-up, plunge countdown with first-30s cold-shock coaching, and a guided warm-up — for any cold source
• Log sessions: temperature (C/F), duration, water source, how you felt, and post-plunge clarity and mood — in a tap or two
• Streaks and a calendar heatmap: current and longest streak, total time-in-cold, longest plunge, weekly minutes
• Breathwork trainer: box breathing and Wim-Hof-style rounds, with the safety lock that never lets you breath-hold in or before water
• Safety guardrails: cold-shock and afterdrop guidance, a sensible exposure ramp, and contraindication warnings — free, never paywalled
• Protocols library: beginner ramp, Wim-Hof-style, contrast (sauna to cold), athletic recovery
• 90-day history, CSV export, local backup and restore
• Large text, high contrast, reduced motion — accessibility is free

KELVIN+ (OPTIONAL, 100% ON-DEVICE)
• Adaptation insights: your cold-capacity curve trending up, the temperature-by-duration tolerance trend, "you've banked 4h12m in the cold this month," best time of day for clarity, and mood correlation
• On-device AI coach digest: a plain-language recap of your week plus a personalized next-week ramp, grounded in your logs — your data never leaves the phone
• Custom protocols and contrast builder, plus sauna and heat sessions
• Goals and challenges (the 30-day cold streak) and shareable streak cards
• Unlimited history and advanced stats

THE SEARCH TERMS WE WERE BUILT FOR
Cold plunge. Cold plunge tracker. Ice bath. Cold plunge app. Plunge timer. Ice bath timer. Cold exposure. Cold shower. A cold therapy and breathwork tracker that respects the practice — on any cold source.

Kelvin is not medical advice. Cold exposure carries real risks — cold shock, afterdrop, and, with breath-holds in or near water, shallow-water blackout and drowning. Consult a doctor before starting, especially with a heart condition, high blood pressure, or during pregnancy.

Feedback? Email [e-mail] — we read every note.

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