# Seconds Pro Interval Timer vs Fitly Pro

The clearest difference is price: Fitly Pro at Free against Seconds Pro Interval Timer's $7.99. Fitly Pro also leads on iOS requirement (15.0 vs 18.0). Seconds Pro Interval Timer's advantage is ads (none vs shown) and update cadence (fortnightly vs every 6 weeks). On in-app purchases and device support there is nothing between them.

Fitly Pro is free to download; Seconds Pro Interval Timer costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Seconds Pro Interval Timer ships an update fortnightly, Fitly Pro every 6 weeks. The most recent releases landed on September 24, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Seconds Pro Interval Timer | Fitly 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 | No |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | Paid | — |
| Best chart rank | **#8** | — |
| Size | 94 MB | 117 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Runloop Ltd](https://appshunter.io/developer/325563420) | [Sideloaded Studio LLC](https://appshunter.io/developer/1848266188) |

## 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


### Fitly Pro

[App page](https://appshunter.io/ios/app/fitly-pro/id6754440128)

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

**In-app purchases:** none


## Frequently asked questions

### Is Seconds Pro Interval Timer free?

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

### Is Fitly Pro free?

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

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

Fitly Pro shows ads; Seconds Pro Interval Timer does not.

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

Seconds Pro Interval Timer ships an update fortnightly, and Fitly Pro every 6 weeks. Most recently, Seconds Pro Interval Timer was updated on September 24, 2026 and Fitly Pro on September 19, 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.*