# Seconds Interval Timer vs Custom Fitness Timer

The clearest difference is in-app purchases: Custom Fitness Timer at none against Seconds Interval Timer's 1. Custom Fitness Timer also leads on update cadence (every 4 days vs monthly) and review sentiment (100% vs 75%). Seconds Interval Timer's advantage is ads (none vs shown) and ratings volume (24K vs 6). On price and device support there is nothing between them.

Both are free to download. Seconds Interval Timer sells 1 one-off in-app purchase. Custom Fitness Timer asks for nothing beyond the download.

Custom Fitness Timer holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Seconds Interval Timer has 24K ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 75% of Seconds Interval Timer's written reviews are positive against 100% of Custom Fitness Timer's.

Seconds Interval Timer ships an update monthly, Custom Fitness Timer every 4 days. The most recent releases landed on September 26, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | Seconds Interval Timer | Custom Fitness Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (24K ratings)](https://appshunter.io/ios/app/seconds-interval-timer/id475816966/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/custom-fitness-timer/id6448923014/reviews)** |
| Number of ratings | **24K** | 6 |
| Positive reviews | 75.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 4 days** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 95 MB | 15 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Runloop Ltd](https://appshunter.io/developer/325563420) | [Jared Rosenthal](https://appshunter.io/developer/1686932132) |

## What reviewers say

### Seconds Interval Timer

[App page](https://appshunter.io/ios/app/seconds-interval-timer/id475816966)

This app provides a versatile interval timer for various workout types like Tabata, HIIT, and circuit training. It features a clear, full-screen display, customizable alerts, and background operation. Users can also utilize a stopwatch and countdown timer, with integration for Apple Health.

**Highlights:** Full-screen colored display, Templates for HIIT, Tabata, Circuit Training, Voice and audio alerts, Music assignment per interval, Background operation, Apple Health integration, Stopwatch and countdown timer

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced Version | $7.99 | one-time |

**What reviewers like**

- 🚀 Great workout app
- 👍 Customizable and user-friendly
- 🔒 Reliable and stable
- 💡 Versatile for various workouts
- 👍 Easy to create and edit timers

**What reviewers complain about**

- 🐛 Occasional audio issues
- 🔍 Limited Apple Watch integration
- 💰 Paid version required for full functionality
- 🕰️ Time-consuming to set up complex workouts

**Reported bugs**

- Timer sometimes stops working unexpectedly
- Issues with restoring purchases on new devices

**Requested features**

- Ability to change beep/alert volume independently
- Option to delay transition between intervals
- Sync workouts across devices
- More preset workout templates
- Heart rate monitoring integration


### Custom Fitness Timer

[App page](https://appshunter.io/ios/app/custom-fitness-timer/id6448923014)

Create and manage custom timers for various fitness activities like countdowns, intervals, and work/rest periods. Features include intuitive navigation, a press-and-hold stopwatch, and optional sound alerts. Personalize timers with custom names and colors to match different phases.

**Highlights:** Unlimited custom timer creation, Countdown timer, Interval timer, Work/Rest timer, Press and hold stopwatch, Optional timer sounds, Color-coded timer phases

**In-app purchases:** none


## Frequently asked questions

### Is Seconds Interval Timer free?

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

### Is Custom Fitness Timer free?

Custom Fitness Timer is free to download, with no in-app purchases.

### Which has better reviews, Seconds Interval Timer or Custom Fitness Timer?

Custom Fitness Timer is rated higher. Seconds Interval Timer averages 4.7 out of 5 from 24K ratings, while Custom Fitness Timer averages 5.0 from 6 ratings.

### Do Seconds Interval Timer or Custom Fitness Timer have ads?

Custom Fitness Timer shows ads; Seconds Interval Timer does not.

### Which is updated more often, Seconds Interval Timer or Custom Fitness Timer?

Seconds Interval Timer ships an update monthly, and Custom Fitness Timer every 4 days. Most recently, Seconds Interval Timer was updated on September 26, 2026 and Custom Fitness Timer on June 11, 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.*