# Interval Timer vs Core Progression App

The clearest difference is in-app purchases: Core Progression App at none against Interval Timer's 8. Core Progression App also leads on ads (none vs shown) and rating (4.9 vs 4.5). Interval Timer's advantage is update cadence (every 9 days vs every 3 months) and ratings volume (19K vs 32). On price and iOS requirement there is nothing between them.

Both are free to download. Interval Timer sells 6 in-app purchases, starting at $0.99 per month. Core Progression App asks for nothing beyond the download.

Core Progression App holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: Interval Timer has 19K ratings behind it against 32, so its average is the more settled of the two. Written reviews point the same way: 73% of Interval Timer's written reviews are positive against 100% of Core Progression App's.

Interval Timer ships an update every 9 days, Core Progression App every 3 months. The most recent releases landed on October 14, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Interval Timer | Core Progression App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (19K ratings)](https://appshunter.io/ios/app/interval-timer-tabata-timer/id406473568/reviews) | **[4.9 (32 ratings)](https://appshunter.io/ios/app/core-progression-app/id1436977364/reviews)** |
| Number of ratings | **19K** | 32 |
| Positive reviews | 72.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 9 days** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 143 MB | 152 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [NEO PIXEL LABS PTE. LTD.](https://appshunter.io/developer/1788472183) | [Core Progression LLC](https://appshunter.io/developer/1436977363) |

## What reviewers say

### Interval Timer

[App page](https://appshunter.io/ios/app/interval-timer-tabata-timer/id406473568)

This app helps you manage workout intervals with customizable work and rest periods. It runs in the background and allows music playback, with options to save settings and share progress. Integrates with Apple Health for heart rate monitoring.

**Highlights:** Customizable sets, intervals, and rest times, Runs in background and with screen locked, Music playlist integration, Save settings as templates, Apple Health integration for heart rate, Post workouts to social media

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus - 1 Month | $0.99 | per month |
| Premium - 1 Month | $1.99 | per month |
| Plus - 1 Month | $1.99 | per month |
| Premium - 1 Month | $2.99 | per month |
| Plus - 1 Year | $4.99 | per year |
| Premium - 1 Year | $9.99 | per year |

**What reviewers like**

- 🚀 Free version works well
- 👍 Customizable intervals and timers
- 👍 Flexible for different workouts
- 👍 Easy to use and set up
- 👍 Provides visual and audio cues

**What reviewers complain about**

- 🐛 Timer issues (stops, loses time)
- 🔋 Drains battery when used
- 💰 Expensive subscription model
- 📢 Intrusive ads
- 🔒 Incompatible with other apps

**Reported bugs**

- Ads block functionality
- App freezes or crashes
- Timer doesn't work in background

**Requested features**

- Add notes to workouts
- Provide workout history and analytics
- Allow syncing with Apple Health
- Improve Apple Watch integration
- Add more customization options


### Core Progression App

[App page](https://appshunter.io/ios/app/core-progression-app/id1436977364)

This comprehensive fitness platform helps you track daily activities, monitor body metrics, and access over 2000 exercises with 3D demonstrations. Create custom workouts or use presets to guide your fitness journey, earning badges along the way. Syncs with Apple Health for seamless activity logging.

**Highlights:** Class schedules and opening hours, Daily fitness activity tracking, Weight and body metric tracking, 2000+ exercises with 3D demos, Preset and custom workouts, Badge earning system, Apple Health synchronization

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Interval Timer free?

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

### Is Core Progression App free?

Core Progression App is free to download, with no in-app purchases.

### Which has better reviews, Interval Timer or Core Progression App?

Core Progression App is rated higher. Interval Timer averages 4.5 out of 5 from 19K ratings, while Core Progression App averages 4.9 from 32 ratings.

### Do Interval Timer or Core Progression App have ads?

Interval Timer shows ads; Core Progression App does not.

### Which is updated more often, Interval Timer or Core Progression App?

Interval Timer ships an update every 9 days, and Core Progression App every 3 months. Most recently, Interval Timer was updated on October 14, 2026 and Core Progression App on October 1, 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.*