# Interval Randomizer vs Smart Trainer app

The clearest difference is in-app purchases: Interval Randomizer at none against Smart Trainer app's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Smart Trainer app sells 1 one-off in-app purchase. Interval Randomizer asks for nothing beyond the download.

Interval Randomizer ships an update monthly, Smart Trainer app every 3 weeks. The most recent releases landed on October 6, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Interval Randomizer | Smart Trainer app |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Size | 6 MB | 10 MB |
| Requires iOS | 18.2 | **17.6** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Hitfire Production AB](https://appshunter.io/developer/1517601288) | [Sandris Radzins](https://appshunter.io/developer/1821254962) |

## What reviewers say

### Interval Randomizer

[App page](https://appshunter.io/ios/app/interval-randomizer-hiit/id6742220783)

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

**In-app purchases:** none


### Smart Trainer app

[App page](https://appshunter.io/ios/app/smart-trainer-app/id6747401793)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version Access | $3.99 | one-time |


## Frequently asked questions

### Is Interval Randomizer free?

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

### Is Smart Trainer app free?

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

### Do Interval Randomizer or Smart Trainer app have ads?

Neither Interval Randomizer nor Smart Trainer app shows ads.

### Which is updated more often, Interval Randomizer or Smart Trainer app?

Interval Randomizer ships an update monthly, and Smart Trainer app every 3 weeks. Most recently, Interval Randomizer was updated on October 6, 2026 and Smart Trainer app on October 7, 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.*