# Seconds Interval Timer vs ImersU

The clearest difference is rating: Seconds Interval Timer at 4.7 against ImersU's 3.0. Seconds Interval Timer also leads on ratings volume (24K vs 2) and review sentiment (75% vs 60%). ImersU's advantage is in-app purchases (none vs 1) and iOS requirement (15.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

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

Seconds Interval Timer holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Seconds Interval Timer has 24K ratings behind it against 2, 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 60% of ImersU's.

Seconds Interval Timer ships an update monthly, ImersU every 2 weeks. The most recent releases landed on September 24, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Seconds Interval Timer | ImersU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (24K ratings)](https://appshunter.io/ios/app/seconds-interval-timer/id475816966/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/imersu/id6444767962/reviews) |
| Number of ratings | **24K** | 2 |
| Positive reviews | **75.0% of reviews** | 60.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 95 MB | 259 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Runloop Ltd](https://appshunter.io/developer/325563420) | [Immersive Gym Company Limited](https://appshunter.io/developer/1655703445) |

## 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


### ImersU

[App page](https://appshunter.io/ios/app/imersu/id6444767962)

Experience indoor rowing like never before with virtual, real-world courses. Train or race against AI, customize your environment, and connect with your rowing machine for an immersive fitness journey.

**Highlights:** Virtual real-world rowing courses, Customizable time of day and weather, AI boat racing, Connects with rowing machines via Bluetooth FTMS, Flow Row mode for non-connected ergometers, Multi-screen display support

**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 ImersU free?

ImersU is free to download, with no in-app purchases.

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

Seconds Interval Timer is rated higher. Seconds Interval Timer averages 4.7 out of 5 from 24K ratings, while ImersU averages 3.0 from 2 ratings.

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

Neither Seconds Interval Timer nor ImersU shows ads.

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

Seconds Interval Timer ships an update monthly, and ImersU every 2 weeks. Most recently, Seconds Interval Timer was updated on September 24, 2026 and ImersU on September 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.*