ThermoTimer vs Phase
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ThermoTimer
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Take Control of Your Hot & Cold Therapy ThermoTimer is the ultimate timing companion for sauna lovers, cold-plunge enthusiasts, and anyone practicing contrast therapy. Whether you’re just getting started or following advanced protocols like the Wim Hof method, ThermoTimer keeps every session precise, safe, and effortless. 6 Guided Therapy Protocols Choose from expertly designed routines—perfect for recovery, wellness, stress reduction, and building resilience: Beginner – A gentle intro to heat & cold therapy Wim Hof Method – Short cold cycles with extended heat recovery Finnish Sauna – Classic Nordic-style timing Contrast Therapy – Switch smoothly between hot and cold Quick Recovery – A fast routine for busy days Cold Focused – Ideal for ice bath and cold plunge training Each protocol includes clear phase transitions, visual cues, and optional audio alerts. Built for Real Sauna Conditions ThermoTimer is designed to perform flawlessly in hot, humid, or low-light environments: Large, high-contrast timer visible through steam Dim mode to keep screens discreet in dark saunas Tap-friendly controls — no tiny buttons Live Activities keeps your timer on the Lock Screen Works 100% offline for remote cabins or spa settings Apple Watch Integration Leave your phone outside the heat. Start, pause, skip phases, and view progress directly from your wrist. Perfect for saunas, cold tubs, and recovery sessions. Track Your Progress Stay consistent and see your improvement over time: Full session history Time spent in hot & cold phases Streak tracking Session export for coaches or wellness logs Three Beautiful Themes Match your environment and personal style: Sauna Glow – Warm amber hues Dark Minimal – Clean, OLED-friendly black Light Clean – High contrast for outdoor cold plunging Clear Audio & Haptic Alerts Never miss a phase transition again. Choose from subtle countdown beeps, phase-complete sounds, or gentle haptics. No Account. No Ads. No Subscriptions. Just a powerful, beautifully designed thermal therapy timer—always ready when you are. Perfect For Sauna users & cold plunge fans Contrast therapy routines Recovery athletes Breathwork & resilience training Wellness spas & at-home sauna setups Wim Hof method practitioners Transform your heat & cold routine with precision.
Phase
This app guides you through a personalized daily plan to gradually shift your sleep schedule. It provides timed nudges based on your local sunrise and sunset to help you achieve your desired bedtime and wake-up times.
- Personalized day-by-day sleep schedule
- Science-backed daily nudges
- Multiple sleep programs for different needs
- Location-aware sunrise/sunset sync
- Offline functionality
- HealthKit integration
- Home and Lock Screen widgets
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Your sleep schedule is off. Phase shifts it back — one day at a time. Phase is a guided program that fixes your broken sleep schedule through small, progressive daily shifts. No vague advice. No endless tracking. Just a clear plan that moves your bedtime and wake time closer to your goal — 15 minutes at a time. Tell Phase when you currently sleep, when you want to sleep, and it builds a personalized day-by-day plan to get you there. HOW IT WORKS - Pick a program that fits your situation - Set your current and goal sleep times - Get a personalized day-by-day schedule - Follow science-backed daily nudges - Watch your sleep shift into place 6 SLEEP PROGRAMS Phase is not one-size-fits-all. Pick the program that matches your situation: - Sleep Schedule Reset — the original 14-day phase shift - Night Owl Fix — stop going to bed at 3 AM - Jet Lag Recovery — get back on local time fast - Weekend Drift Reset — fix the Sunday-night-to-Monday-morning gap - Shift Work Transition — adjust to a new work schedule - Early Riser Challenge — become a morning person in two weeks YOUR DAILY NUDGES Every day, Phase gives you timed nudges based on your schedule and your local sunrise and sunset: - Morning Light — get sunlight early to reset your internal clock - Caffeine Cutoff — stop caffeine at the right time so it does not interfere with sleep - Screen Dim — reduce blue light before bed to protect melatonin - Wind Down — start your pre-sleep routine at the right moment - Bedtime — hit the pillow at your new target time All nudge times adjust automatically as your schedule shifts forward each day. Toggle nudges on or off and fine-tune timing to fit your life. WIDGETS AND LIVE ACTIVITY - Home Screen and Lock Screen widgets for sun position, nudge checklist, bedtime countdown, and sleep stats - Bedtime Live Activity — a countdown on your Lock Screen and Dynamic Island as bedtime approaches - Bedtime alarm that rings through Silent Mode and Do Not Disturb WHAT MAKES PHASE DIFFERENT - A real program, not a tracker — a clear plan with a finish line - Location-aware — nudge times sync with your actual sunrise and sunset - Works offline — no account, no login, no cloud - Science-backed — based on circadian rhythm research - Beautiful Sun Arc — a visual map of your day showing light, nudges, and targets - Schedule exceptions — have an early flight? Adjust one day without breaking your plan - Takes 30 seconds to set up TRACK YOUR PROGRESS See your journey laid out. Check off each day. Build streaks. Get encouragement when you need it. Know exactly how far you have come and how close you are to your goal. HEALTHKIT INTEGRATION Phase reads your sleep, sunlight, exercise, and caffeine data from Apple Health to auto-verify nudges and show activity bars on your daily timeline. Phase never writes to HealthKit — your data stays yours. BUILT FOR FOCUS No charts. No dashboards. No social features. Phase does one thing and does it well — it fixes your sleep schedule. Your body has a clock. Phase helps you reset it. Terms of Use: https://www.theblackholecompany.com/termsConditions.html
Screenshots
Verdict
The clearest difference is price: Phase at Free against ThermoTimer's $4.99. On update cadence, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Phase is free to download; ThermoTimer costs $4.99 up front. ThermoTimer sells 1 one-off in-app purchase and Phase sells 6 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.
ThermoTimer ships an update every 2 months, Phase every 5 weeks. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.
| Parameter | ThermoTimer | Phase |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | — | 4.8 (5 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 5 — better |
| Update frequency | Every 2 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Free |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 8 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Andy Arevalo | Youssef Ismaili |
In-app purchases
ThermoTimer
- ThermoTimer Pro$4.99
Phase
- Phase Pro$0.997 Days
- Phase Pro$5.991 Year
- Lifetime Phase Pro$1.99
- Pro$2.99
- Lifetime Pro$4.99
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- Phase Pro$9.99








