# Interval Flow vs Peaks

The clearest difference is monetization model: Peaks at freemium against Interval Flow's subscription. Peaks also leads on review sentiment (64% vs 48%). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Interval Flow sells 10 in-app purchases, starting at $4.99 per 3 months and Peaks sells 6 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for Interval Flow against 4.7 for Peaks. Both are backed by a comparable volume of ratings — 167 and 289 respectively. Written reviews are what separate them: 48% of Interval Flow's written reviews are positive against 64% of Peaks's.

Interval Flow ships an update fortnightly, Peaks every 2 weeks. The most recent releases landed on November 3, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Interval Flow | Peaks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (167 ratings)](https://appshunter.io/ios/app/interval-flow-wod-timer/id6444124987/reviews)** | [4.7 (289 ratings)](https://appshunter.io/ios/app/peaks-sleep-and-energy/id6446705377/reviews) |
| Number of ratings | 167 | **289** |
| Positive reviews | 48.1% of reviews | **64.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 weeks** |
| Monetization | Subscription | **Freemium** |
| Size | 20 MB | 232 MB |
| Requires iOS | 18.6 | **18.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Bence Kaposzta](https://appshunter.io/developer/1650069302) | [Vogelhaus Apps GmbH](https://appshunter.io/developer/1563696067) |

## What reviewers say

### Interval Flow

[App page](https://appshunter.io/ios/app/interval-flow-wod-timer/id6444124987)

This app revolutionizes fitness routines with deep customization and advanced tracking for various activities like HIIT, Yoga, and CrossFit. It allows users to create, share, and follow personalized workouts with features like color-coded intervals, real-time progress tracking, and voice assistance.

**Highlights:** Color-coded intervals, Customizable circuits, Real-time progress tracking, Voice assist and search, Exercise library, Workout sharing

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 Month | $4.99 | per 3 months |
| 1 Month | $9.99 | per month |
| 1 Month, 3 day trial | $9.99 | per month |
| Annual | $14.99 | per year |
| 1 Year discounted | $25.95 | per year |
| 1 Year, 3 day trial | $39.99 | per year |
| 1 Year | $39.99 | per year |
| 1 Year Intro month | $39.99 | per year |
| Free Lifetime subscription | Free | one-time |
| Lifetime | $24.99 | one-time |

**What reviewers like**

- 👍 Nicely designed with good features
- 👍 Unique and brilliantly for keeping fit
- 👍 Simplicity gets it done

**What reviewers complain about**

- 🐛 App crashes on launch
- 🐛 App doesn't remember interval settings
- 🐛 App rearranges workout order
- 🐛 Cannot see questionnaire properly
- 🐛 Robot voice with no visual instructions

**Reported bugs**

- Programs deleted after update
- App crashes when adding a program
- Show/Hide Instructions adds time to interval
- App defaults to unused workout
- Cannot permanently skip to end of timed activity

**Requested features**

- Increase repetitions to 20
- Streamline adding intervals
- Make it possible to hide unused workouts
- Add music integration or option
- Provide visual instructions for moves


### Peaks

[App page](https://appshunter.io/ios/app/peaks-sleep-and-energy/id6446705377)

This app analyzes your sleep patterns to predict your daily energy levels, helping you schedule tasks and breaks effectively. It uses scientific models to provide personalized energy curves and insights into sleep quality, recovery, and vitals.

**Highlights:** Personalized energy curve predictions, Sleep timing and debt tracking, Recovery and sleep score analysis, Home and Lock Screen widgets, Calendar export, Integrates with Apple HealthKit, Oura, Garmin

**Features:** Family Sharing, Apple Watch app

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $5.99 | per month |
| Yearly | $39.99 | per year |
| Yearly - Referral | $39.99 | per year |
| Yearly - Referrer | $39.99 | per year |
| Yearly | $39.99 | per year |
| Lifetime | $149.99 | one-time |


## Frequently asked questions

### Is Interval Flow free?

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

### Is Peaks free?

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

### Which has better reviews, Interval Flow or Peaks?

Interval Flow is rated higher. Interval Flow averages 4.7 out of 5 from 167 ratings, while Peaks averages 4.7 from 289 ratings.

### Do Interval Flow or Peaks have ads?

Neither Interval Flow nor Peaks shows ads.

### Which is updated more often, Interval Flow or Peaks?

Interval Flow ships an update fortnightly, and Peaks every 2 weeks. Most recently, Interval Flow was updated on November 3, 2026 and Peaks on November 12, 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.*