# Intervals Timer vs Keiser M Series

The clearest difference is price: Keiser M Series at Free against Intervals Timer's $4.99. Keiser M Series also leads on update cadence (weekly vs every 2 months) and iOS requirement (13.0 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

Keiser M Series is free to download; Intervals Timer costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Intervals Timer ships an update every 2 months, Keiser M Series weekly. The most recent releases landed on October 4, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Intervals Timer | Keiser M Series |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[4.3 (2.8K ratings)](https://appshunter.io/ios/app/keiser-m-series/id1094598975/reviews)** |
| Number of ratings | — | **2.8K** |
| Positive reviews | — | 19.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | — | Free |
| Size | 2 MB | 77 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [ILIOS Incorporated](https://appshunter.io/developer/738673887) | [Keiser Corp.](https://appshunter.io/developer/1094598974) |

## What reviewers say

### Intervals Timer

[App page](https://appshunter.io/ios/app/intervals-timer/id821177477)

**Features:** macOS Compatibility

**In-app purchases:** none


### Keiser M Series

[App page](https://appshunter.io/ios/app/keiser-m-series/id1094598975)

This app collects data from Keiser M Series Intelligent equipment, offering real-time training metrics like power and cadence. It supports free rides, FTP tests, and guided workouts, syncing data to the Keiser Metrics cloud and compatible platforms.

**Highlights:** Real-time training graphs, Power, cadence, FTP zones, Free ride mode, FTP test functionality, Guided workout sessions, Workout data syncing

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Quick connection to equipment
- 👍 Easy to use
- 👍 Useful guided sessions
- 👍 Integrates with Strava

**What reviewers complain about**

- 🐛 Disconnects quickly
- 🐛 Inaccurate distance and power data
- 🐛 Loses connectivity when switching apps
- 🐛 Unreliable data recording
- 🐛 Difficult to use in group settings

**Reported bugs**

- App frequently logs users out
- Inconsistent data recording and syncing
- Compatibility issues with newer devices and iOS versions
- Inability to save user profiles and settings

**Requested features**

- Integration with Apple Watch for heart rate data
- Background app functionality
- More customizable workout options
- Better data visualization and progress tracking
- Improved Strava and other app integrations


## Frequently asked questions

### Is Intervals Timer free?

Intervals Timer costs $4.99, with no in-app purchases.

### Is Keiser M Series free?

Keiser M Series is free to download, with no in-app purchases.

### Do Intervals Timer or Keiser M Series have ads?

Neither Intervals Timer nor Keiser M Series shows ads.

### Which is updated more often, Intervals Timer or Keiser M Series?

Intervals Timer ships an update every 2 months, and Keiser M Series weekly. Most recently, Intervals Timer was updated on October 4, 2026 and Keiser M Series on October 10, 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.*