# ThermoTimer vs Phase

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.

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.

## The numbers

| Metric | ThermoTimer | Phase |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[4.8 (5 ratings)](https://appshunter.io/ios/app/phase-sleep-schedule-reset/id6759457939/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | — | Free |
| Size | 8 MB | 32 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Andy Arevalo](https://appshunter.io/developer/1853674132) | [Youssef Ismaili](https://appshunter.io/developer/1696488085) |

## What reviewers say

### ThermoTimer

[App page](https://appshunter.io/ios/app/thermotimer/id6755892933)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ThermoTimer Pro | $4.99 | one-time |


### Phase

[App page](https://appshunter.io/ios/app/phase-sleep-schedule-reset/id6759457939)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Phase Pro | $0.99 | per 7 days |
| Phase Pro | $5.99 | per year |
| Lifetime Phase Pro | $1.99 | one-time |
| Pro | $2.99 | one-time |
| Lifetime Pro | $4.99 | one-time |
| Phase Pro | $9.99 | one-time |


## Frequently asked questions

### Is ThermoTimer free?

ThermoTimer costs $4.99, and also offers in-app purchases.

### Is Phase free?

Phase is free to download, with in-app purchases available.

### Do ThermoTimer or Phase have ads?

Neither ThermoTimer nor Phase shows ads.

### Which is updated more often, ThermoTimer or Phase?

ThermoTimer ships an update every 2 months, and Phase every 5 weeks. Most recently, ThermoTimer was updated on October 8, 2026 and Phase on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*