# Seconds Pro Interval Timer vs B3

The clearest difference is price: B3 at Free against Seconds Pro Interval Timer's $7.99. B3 also leads on rating (5.0 vs 4.8) and iOS requirement (13.0 vs 18.0). Seconds Pro Interval Timer's advantage is ratings volume (12K vs 5) and chart position (#7 vs unranked). On update cadence, ads, in-app purchases and device support there is nothing between them.

B3 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.

B3 holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Seconds Pro Interval Timer has 12K ratings behind it against 5, so its average is the more settled of the two.

Seconds Pro Interval Timer ships an update fortnightly, B3 monthly. The most recent releases landed on October 14, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Seconds Pro Interval Timer | B3 |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | [4.8 (12K ratings)](https://appshunter.io/ios/app/seconds-pro-interval-timer/id363978811/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/b3-bodies-by-bombshell/id6757632713/reviews)** |
| Number of ratings | **12K** | 5 |
| Positive reviews | 79.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#7** | — |
| Size | 94 MB | 419 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Runloop Ltd](https://appshunter.io/developer/325563420) | [Bombshell Fitness](https://appshunter.io/developer/1738345176) |

## What reviewers say

### Seconds Pro Interval Timer

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

**Currently charting:** #7 Top Paid · Health & Fitness, #73 Top Paid (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


### B3

[App page](https://appshunter.io/ios/app/b3-bodies-by-bombshell/id6757632713)

This app offers personalized coaching for body, habits, and lifestyle transformations. Connect with certified coaches for tailored training, nutrition, and progress tracking to build strength and confidence.

**Highlights:** Customized coaching experience, Personalized training and nutrition, Progress tracking, Habit and lifestyle guidance, Direct coach communication, Health app integration

**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 B3 free?

B3 is free to download, with no in-app purchases.

### Which has better reviews, Seconds Pro Interval Timer or B3?

B3 is rated higher. Seconds Pro Interval Timer averages 4.8 out of 5 from 12K ratings, while B3 averages 5.0 from 5 ratings.

### Do Seconds Pro Interval Timer or B3 have ads?

Neither Seconds Pro Interval Timer nor B3 shows ads.

### Which is updated more often, Seconds Pro Interval Timer or B3?

Seconds Pro Interval Timer ships an update fortnightly, and B3 monthly. Most recently, Seconds Pro Interval Timer was updated on October 14, 2026 and B3 on October 6, 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.*