# Custom Interval Timers vs Core

The clearest difference is in-app purchases: Custom Interval Timers at none against Core's 3. Custom Interval Timers also leads on update cadence (every 4 months vs every 33 months) and ratings volume (14 vs 4). Core's advantage is ads (none vs shown). On price, rating, review sentiment and device support there is nothing between them.

Both are free to download. Core sells 3 in-app purchases, starting at $1.99 per month. Custom Interval Timers asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Custom Interval Timers against 5.0 for Core. Both are backed by a comparable volume of ratings — 14 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Custom Interval Timers ships an update every 4 months, Core every 33 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Custom Interval Timers | Core |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (14 ratings)](https://appshunter.io/ios/app/custom-interval-timers/id1552160706/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/core-interval-and-hiit-timer/id1562215374/reviews) |
| Number of ratings | **14** | 4 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 33 months |
| Monetization | **Ad-supported** | Freemium |
| Size | 40 MB | 9 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alex Rich](https://appshunter.io/developer/1030627712) | [Yating Lu](https://appshunter.io/developer/1526204219) |

## What reviewers say

### Custom Interval Timers

[App page](https://appshunter.io/ios/app/custom-interval-timers/id1552160706)

Design personalized interval timers for workouts or productivity. Its intuitive editor allows for custom flows with various settings like countdowns and personalized interfaces. Offers light/dark modes and an option to disable ads.

**Highlights:** Customizable interval flows, Intuitive timer editor, Count up or down timers, Personalized running interface, Light/dark mode, Ad-free option

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

**In-app purchases:** none


### Core

[App page](https://appshunter.io/ios/app/core-interval-and-hiit-timer/id1562215374)

This app helps you stay focused during workouts by managing intervals, work times, and rest periods with clear visual and audio cues. Save custom routines for HIIT, Tabata, or boxing, and track your training history to monitor progress.

**Highlights:** Customizable interval timers, Audio cues for work/rest phases, Save and reuse workout routines, Visual countdown and color coding, Workout history and trend tracking, Optional Pro features via in-app purchase

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Yearly | $9.99 | per year |
| Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is Custom Interval Timers free?

Custom Interval Timers is free to download, with no in-app purchases.

### Is Core free?

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

### Which has better reviews, Custom Interval Timers or Core?

Custom Interval Timers and Core are both rated 5.0 out of 5 on the App Store, from 14 and 4 ratings respectively.

### Do Custom Interval Timers or Core have ads?

Custom Interval Timers shows ads; Core does not.

### Which is updated more often, Custom Interval Timers or Core?

Custom Interval Timers ships an update every 4 months, and Core every 33 months. Most recently, Custom Interval Timers was updated on October 29, 2026 and Core on October 30, 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.*