# Seconds Interval Timer vs TimerNinja

The clearest difference is ratings volume: Seconds Interval Timer at 24K against TimerNinja's 8. Seconds Interval Timer also leads on rating (4.7 vs 4.4) and iOS requirement (18.0 vs 26.0). TimerNinja's advantage is review sentiment (83% vs 75%) and device support (6 vs 3). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Seconds Interval Timer sells 1 one-off in-app purchase and TimerNinja sells 4 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Seconds Interval Timer holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Seconds Interval Timer has 24K ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 75% of Seconds Interval Timer's written reviews are positive against 83% of TimerNinja's, so the app with the better star average is not the one people write more warmly about.

Seconds Interval Timer ships an update monthly, TimerNinja every 3 weeks. The most recent releases landed on September 25, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Seconds Interval Timer | TimerNinja |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (24K ratings)](https://appshunter.io/ios/app/seconds-interval-timer/id475816966/reviews)** | [4.4 (8 ratings)](https://appshunter.io/ios/app/timerninja-activity-timers/id1591804917/reviews) |
| Number of ratings | **24K** | 8 |
| Positive reviews | 75.0% of reviews | **83.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 95 MB | 11 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Runloop Ltd](https://appshunter.io/developer/325563420) | [Heftii, Inc.](https://appshunter.io/developer/1588613002) |

## 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


### TimerNinja

[App page](https://appshunter.io/ios/app/timerninja-activity-timers/id1591804917)

Track time for workouts and productivity with versatile timer options. Supports Apple Watch integration, Apple Health recording, and SharePlay for synchronized challenges with friends. Offers customizable themes and multiple timer types.

**Highlights:** Multiple timer types (Stopwatch, Countdown, Intervals, EMOM, Pomodoro), Apple Watch standalone app and remote control, Record workouts to Apple Health, SharePlay for synchronized workouts with friends, Customizable dark and light themes, Standalone Apple Watch app

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TimerNinja+ Monthly | $2.99 | per month |
| TimerNinja+ Family Monthly | $3.99 | per month |
| TimerNinja+ Yearly | $9.99 | per year |
| TimerNinja+ Family Yearly | $14.99 | per year |


## Frequently asked questions

### Is Seconds Interval Timer free?

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

### Is TimerNinja free?

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

### Which has better reviews, Seconds Interval Timer or TimerNinja?

Seconds Interval Timer is rated higher. Seconds Interval Timer averages 4.7 out of 5 from 24K ratings, while TimerNinja averages 4.4 from 8 ratings.

### Do Seconds Interval Timer or TimerNinja have ads?

Neither Seconds Interval Timer nor TimerNinja shows ads.

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

Seconds Interval Timer ships an update monthly, and TimerNinja every 3 weeks. Most recently, Seconds Interval Timer was updated on September 25, 2026 and TimerNinja on September 8, 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.*