# Seconds Interval Timer vs Onyx Timer

The clearest difference is rating: Seconds Interval Timer at 4.7 against Onyx Timer's 4.1. Seconds Interval Timer also leads on ratings volume (24K vs 17) and review sentiment (74% vs 65%). Onyx Timer's advantage is iOS requirement (7.0 vs 18.0). 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 Onyx Timer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Seconds Interval Timer holds the better App Store score, 4.7 against 4.1. That said, the two scores are not equally well evidenced: Seconds Interval Timer has 24K ratings behind it against 17, so its average is the more settled of the two. Written reviews point the same way: 74% of Seconds Interval Timer's written reviews are positive against 65% of Onyx Timer's.

Seconds Interval Timer ships an update monthly, Onyx Timer every 2 weeks. The most recent releases landed on November 10, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Seconds Interval Timer | Onyx Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (24K ratings)](https://appshunter.io/ios/app/seconds-interval-timer/id475816966/reviews)** | [4.1 (17 ratings)](https://appshunter.io/ios/app/onyx-timer-hands-free-voice-controlled-talking-exercise-timer/id880784736/reviews) |
| Number of ratings | **24K** | 17 |
| Positive reviews | **74.5% of reviews** | 65.2% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 99 MB | 35 MB |
| Requires iOS | 18.0 | **7.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Runloop Ltd](https://appshunter.io/developer/325563420) | [Kirill Edelman](https://appshunter.io/developer/460175496) |

## What reviewers say

### Seconds Interval Timer

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

This interval timer app helps you build and run custom workouts for HIIT, Tabata, and circuits. It provides voice cues, runs in the background, and syncs with Apple Watch. Save workouts to Apple Health and track calories burned.

**Highlights:** Build custom timers for any workout, Voice cues for intervals, Runs in background with screen off, Syncs with Apple Watch, Color-coded interval display, Save workouts to Apple Health, Play music with cues

**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


### Onyx Timer

[App page](https://appshunter.io/ios/app/onyx-timer-hands-free-voice-controlled-talking-exercise-timer/id880784736)

This app allows users to create and manage custom workouts combining time-based and rep-based exercises. Control your workout hands-free with voice commands and receive audio cues for each exercise. Workouts can be saved and shared, with options for visual and auditory customization.

**Highlights:** Voice-controlled timer, Mix time and rep-based exercises, Audio exercise announcements, Background operation, Workout saving and sharing, Customizable commands

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is Seconds Interval Timer free?

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

### Is Onyx Timer free?

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

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

Seconds Interval Timer is rated higher. Seconds Interval Timer averages 4.7 out of 5 from 24K ratings, while Onyx Timer averages 4.1 from 17 ratings.

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

Neither Seconds Interval Timer nor Onyx Timer shows ads.

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

Seconds Interval Timer ships an update monthly, and Onyx Timer every 2 weeks. Most recently, Seconds Interval Timer was updated on November 10, 2026 and Onyx Timer on November 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.*