# Interval Timer vs Sustain

The clearest difference is in-app purchases: Sustain at none against Interval Timer's 2. Sustain also leads on iOS requirement (15.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Interval Timer sells 2 in-app purchases, starting at $2.99 per month. Sustain asks for nothing beyond the download.

## The numbers

| Metric | Interval Timer | Sustain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/sustain-x/id6762615576/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Every 6 days |
| Monetization | — | Free |
| Size | 4 MB | 46 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [OLEKSANDR VASETSKYI](https://appshunter.io/developer/1873939856) | [TruBlink LLC](https://appshunter.io/developer/1878512515) |

## What reviewers say

### Interval Timer

[App page](https://appshunter.io/ios/app/interval-timer-tabata-boxing/id6760763901)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Interval Timer Premium – Monthly | $2.99 | per month |
| Interval Timer Premium – Yearly | $17.99 | per year |


### Sustain

[App page](https://appshunter.io/ios/app/sustain-x/id6762615576)

This app connects you with a personal fitness coach for tailored training and nutrition plans. Receive personalized workouts, meal guidance, and track your progress with real-time updates and direct messaging support.

**Highlights:** Personalized workouts, Nutrition guidance, Progress tracking, Direct messaging with coach, Real-time data review, Community features

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

**In-app purchases:** none


## Frequently asked questions

### Is Interval Timer free?

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

### Is Sustain free?

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

### Do Interval Timer or Sustain have ads?

Neither Interval Timer nor Sustain shows ads.

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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.*