# sTrain vs Surge

The clearest difference is price: sTrain at Free against Surge's $2.00. sTrain also leads on iOS requirement (15.0 vs 18.6). Surge's advantage is in-app purchases (none vs 2) and update cadence (fortnightly vs monthly). On ads and device support there is nothing between them.

sTrain is free to download; Surge costs $2.00 up front. sTrain sells 2 one-off in-app purchases. Surge asks for nothing beyond the download.

sTrain ships an update monthly, Surge fortnightly. The most recent releases landed on November 8, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | sTrain | Surge |
| --- | --- | --- |
| Price | **Free** | $2.00 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/surge-interval-timer-and-hiit/id6762224044/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | — | Paid |
| Size | 39 MB | 1 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Anthony Eli Rasch](https://appshunter.io/developer/1785588945) | [Matthew Avery](https://appshunter.io/developer/1893424317) |

## What reviewers say

### sTrain

[App page](https://appshunter.io/ios/app/strain-workout-tracker/id6752215175)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| sTrain Pro - EarlyBird | $3.99 | one-time |
| sTrain Pro - Lifetime | $5.99 | one-time |


### Surge

[App page](https://appshunter.io/ios/app/surge-interval-timer-and-hiit/id6762224044)

This interval timer app is designed for various circuit-style workouts like HIIT, Tabata, and boxing. It provides audio and haptic cues for each phase, allowing users to train without constantly watching the clock. All features are included with a single purchase, offering a complete, ad-free experience.

**Highlights:** Customizable work and rest intervals, Pre-set workout routines (Tabata, HIIT, Boxing), Audio and haptic interval cues, Save up to 20 custom presets, Preparation countdown, Screen stays awake during workouts

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

**In-app purchases:** none


## Frequently asked questions

### Is sTrain free?

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

### Is Surge free?

Surge costs $2.00, with no in-app purchases.

### Do sTrain or Surge have ads?

Neither sTrain nor Surge shows ads.

### Which is updated more often, sTrain or Surge?

sTrain ships an update monthly, and Surge fortnightly. Most recently, sTrain was updated on November 8, 2026 and Surge on November 9, 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.*