# Seconds Pro Interval Timer vs NASM EDGE

The clearest difference is review sentiment: Seconds Pro Interval Timer at 80% against NASM EDGE's 9%. Seconds Pro Interval Timer also leads on rating (4.8 vs 2.9) and in-app purchases (none vs 6). NASM EDGE's advantage is price (Free vs $7.99) and iOS requirement (15.6 vs 18.0). On update cadence and device support there is nothing between them.

NASM EDGE is free to download; Seconds Pro Interval Timer costs $7.99 up front. NASM EDGE sells 6 in-app purchases, starting at $19.99 per month. Seconds Pro Interval Timer asks for nothing beyond the download.

Seconds Pro Interval Timer holds the better App Store score, 4.8 against 2.9. That said, the two scores are not equally well evidenced: Seconds Pro Interval Timer has 12K ratings behind it against 236, so its average is the more settled of the two. Written reviews point the same way: 80% of Seconds Pro Interval Timer's written reviews are positive against 9% of NASM EDGE's.

Seconds Pro Interval Timer ships an update fortnightly, NASM EDGE every 3 weeks. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Seconds Pro Interval Timer | NASM EDGE |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[4.8 (12K ratings)](https://appshunter.io/ios/app/seconds-pro-interval-timer/id363978811/reviews)** | [2.9 (236 ratings)](https://appshunter.io/ios/app/nasm-edge-personal-trainers/id1353245169/reviews) |
| Number of ratings | **12K** | 236 |
| Positive reviews | **79.7% of reviews** | 9.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | **Paid** | Subscription |
| Best chart rank | **#8** | — |
| Size | 94 MB | 235 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Runloop Ltd](https://appshunter.io/developer/325563420) | [ATI](https://appshunter.io/developer/369946807) |

## 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, #110 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


### NASM EDGE

[App page](https://appshunter.io/ios/app/nasm-edge-personal-trainers/id1353245169)

This app provides tools for personal trainers to manage clients, create custom workouts, and track progress. It also offers resources for fitness enthusiasts, including exercise videos and daily routines.

**Highlights:** Client assessment wizard, Custom workout creation, Calorie and macronutrient calculator, Client dashboard with progress tracking, Exercise video library, NASM CPT exam preparation tools

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Trainer Plus (1 Month) | $19.99 | per month |
| Trainer Pro (1 Month) | $34.99 | per month |
| Trainer Quarterly Subscription | $55.99 | per 3 months |
| Trainer Plus (1 Year) | $199.99 | per year |
| Trainer Pro (1 Year) | $349.99 | per year |
| CPT Exam Prep Package | $16.99 | one-time |

**What reviewers like**

- 🚀 Useful assessment features
- 📈 Nutrition calculators
- 💻 Ability to add own videos/exercises
- 📝 Easy to add clients

**What reviewers complain about**

- 🐛 Buggy and crashes frequently
- ⏱️ Slow exercise search and loading
- 🤯 Frustrating to use, glitchy
- 🔍 Limited exercise library
- 💾 Issues saving/updating workouts

**Reported bugs**

- Workouts disappearing after saving
- Exercises not loading properly
- Inability to edit/delete client information
- Frequent login issues and app crashes
- Unreliable syncing between app and web version

**Requested features**

- Add ability to create supersets and circuits
- Allow clients to record weights/reps used
- Integrate with fitness tracking apps
- Add more exercise options, including basic movements
- Improve workout editing and saving functionality


## Frequently asked questions

### Is Seconds Pro Interval Timer free?

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

### Is NASM EDGE free?

NASM EDGE is free to download, with in-app purchases available.

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

Seconds Pro Interval Timer is rated higher. Seconds Pro Interval Timer averages 4.8 out of 5 from 12K ratings, while NASM EDGE averages 2.9 from 236 ratings.

### Do Seconds Pro Interval Timer or NASM EDGE have ads?

NASM EDGE shows ads; Seconds Pro Interval Timer does not.

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

Seconds Pro Interval Timer ships an update fortnightly, and NASM EDGE every 3 weeks. Most recently, Seconds Pro Interval Timer was updated on October 17, 2026 and NASM EDGE on October 13, 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.*