iOS & watchOS · 2026 · design + build
Into
the cold.
A cold-plunge tracker that treats the habit like a Norse saga.
Product strategy, UX/UI design, and full SwiftUI development, shipped from zero to App Store by SUUR.
Habit apps bribe you with confetti. TrackCold swears you to an oath : every session either strengthens it or breaks it.
4
Session types: plunge to contrast
2
Platforms: iPhone & Watch
100%
SwiftUI, strict concurrency
39°F
Coldest water it has logged
The idea
A quest is an oath.
Instead of badges, TrackCold has a Saga: multi-day quests named after runes: Awakening, a week of daily sessions growing from one minute to two; Isa's Stillness; Contrast Path. Progress is written in earned runes, and missing a day doesn't pause the quest, it breaks the oath.
Intent, pressure, story. The mythology isn't a skin. It's the retention mechanic.
The experience
Calm surface. Cold discipline.
01
Rituals, not routines
Presets with names that set the tone: Frostbite, a straight three-minute plunge; Ginnungagap, four alternating rounds of ice and heat. Each ritual shows its cold and warm phases as colored rounds, and a custom builder composes any sequence.
02
A timer that respects the moment
In 39-degree water nobody wants a busy screen. The active session is one ring, one number, and the phase you're in, with pause and skip reachable by a numb thumb. A Live Activity mirrors it on the Lock Screen and Dynamic Island.
03
Your heart tells the truth
HealthKit streams heart rate through every session, and the app charts the drop, the calm arriving in real time. Heart-rate recovery is tracked per session and as a personal record, so adaptation is a number, not a feeling.
04
The Oath Ledger
Longest cold, best oath, coldest water, deepest heart-rate recovery, most rounds: records kept like a ledger of kept promises, with session breakdowns and timing charts underneath.
At the water's edge
The phone stays on dry land.
A watchOS companion runs sessions from the wrist, Live Activities keep the countdown on the Lock Screen, home-screen widgets show the streak, and every finished session logs to Apple Health, then turns into a share card for the group chat that dared you.
Built with intention
100% SwiftUI on both platforms, strict concurrency throughout.
The result
Concept to App Store, in-house.
Product strategy, a complete Norse-flavored design language (fjord blues, ember golds, rune iconography), and the full native build: iPhone, Apple Watch, widgets, Live Activities, and a StoreKit 2 subscription business. All shipped by SUUR.
“Retention isn't a badge system. It's a story the user doesn't want to break.”
Building an app that needs a soul, not a skin?
SUUR designs and ships native mobile products end to end, strategy, UX/UI, and the code.