# Seconds Pro Interval Timer vs KettleLedger Pro

The clearest difference is price: KettleLedger Pro at Free against Seconds Pro Interval Timer's $7.99. KettleLedger Pro also leads on iOS requirement (14.0 vs 18.0). Seconds Pro Interval Timer's advantage is in-app purchases (none vs 3) and chart position (#8 vs unranked). On update cadence, ads and device support there is nothing between them.

KettleLedger Pro is free to download; Seconds Pro Interval Timer costs $7.99 up front. KettleLedger Pro sells 3 in-app purchases, starting at $3.99 per month. Seconds Pro Interval Timer asks for nothing beyond the download.

Seconds Pro Interval Timer ships an update fortnightly, KettleLedger Pro every 9 days. The most recent releases landed on September 30, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Seconds Pro Interval Timer | KettleLedger Pro |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[4.8 (12K ratings)](https://appshunter.io/ios/app/seconds-pro-interval-timer/id363978811/reviews)** | — |
| Number of ratings | **12K** | — |
| Positive reviews | 79.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | Paid | — |
| Best chart rank | **#8** | — |
| Size | 94 MB | 40 MB |
| Requires iOS | 18.0 | **14.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Runloop Ltd](https://appshunter.io/developer/325563420) | [Oliver Bross](https://appshunter.io/developer/1859081127) |

## What reviewers say

### Seconds Pro Interval Timer

[App page](https://appshunter.io/ios/app/seconds-pro-interval-timer/id363978811)

**Currently charting:** #8 Top Paid · Health & Fitness (US App Store)

This interval timer app is designed for high-intensity interval training (HIIT), Tabata, and circuit training workouts. It features a large, color-coded display, customizable interval names, and background operation. It also integrates with Apple Health to track your fitness data.

**Highlights:** Full screen colored display, Templates for HIIT, Tabata, Circuit Training, Speaks interval names and provides warnings, Assign music per interval, Runs in background, Share interval timers, Apple Health integration

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

**In-app purchases:** none

**What reviewers like**

- ⭐ Great updates
- 🤖 Amazing voice prompts
- 👍 Easy to use
- 🎨 Highly customizable
- 🔧 Versatile for various workouts

**What reviewers complain about**

- 🐛 Occasional bugs and glitches
- 🔌 Music volume issues
- 🔍 Complicated setup for some features
- 🌐 Sync/sharing issues between devices
- 🔇 Inconsistent audio cues

**Reported bugs**

- Intervals randomly pausing or skipping
- Music volume issues when launching the app
- Inconsistent audio cues and countdown
- Sync issues between devices

**Requested features**

- Ability to lock Apple Watch screen
- Option to see more than just the next exercise
- Fractional time settings (e.g. 7.74 seconds)
- More voice/audio customization options
- Improved sync between iPhone and iPad


### KettleLedger Pro

[App page](https://appshunter.io/ios/app/kettleledger-pro/id6779903974)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| KettleLedger Pro Monthly | $3.99 | per month |
| KettleLedger Pro Yearly | $34.99 | per year |
| KettleLedger Pro Lifetime | $89.99 | one-time |


## Frequently asked questions

### Is Seconds Pro Interval Timer free?

Seconds Pro Interval Timer costs $7.99, with no in-app purchases.

### Is KettleLedger Pro free?

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

### Do Seconds Pro Interval Timer or KettleLedger Pro have ads?

Neither Seconds Pro Interval Timer nor KettleLedger Pro shows ads.

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

Seconds Pro Interval Timer ships an update fortnightly, and KettleLedger Pro every 9 days. Most recently, Seconds Pro Interval Timer was updated on September 30, 2026 and KettleLedger Pro on September 21, 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.*