# CalorimeterAI vs HIIT Interval Timer & Tracker

The clearest difference is update cadence: HIIT Interval Timer & Tracker at every 3 weeks against CalorimeterAI's every 3 months. HIIT Interval Timer & Tracker also leads on iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. CalorimeterAI sells 3 in-app purchases, starting at $2.99 per 7 days and HIIT Interval Timer & Tracker sells 4 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

CalorimeterAI ships an update every 3 months, HIIT Interval Timer & Tracker every 3 weeks. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | CalorimeterAI | HIIT Interval Timer & Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Size | 100 MB | 57 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Erkin Gonultas](https://appshunter.io/developer/1768562326) | [Ech-Chafai Kadri](https://appshunter.io/developer/1789520174) |

## What reviewers say

### CalorimeterAI

[App page](https://appshunter.io/ios/app/calorimeterai/id6686398685)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Member | $2.99 | per 7 days |
| Monthly Member | $8.99 | per month |
| Annual Member | $106.99 | per year |


### HIIT Interval Timer & Tracker

[App page](https://appshunter.io/ios/app/hiit-interval-timer-and-tracker/id6742692409)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $1.99 | per 7 days |
| Monthly Pro | $4.99 | per month |
| Yearly Pro | $19.99 | per year |
| Pro Access | $19.99 | one-time |


## Frequently asked questions

### Is CalorimeterAI free?

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

### Is HIIT Interval Timer & Tracker free?

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

### Do CalorimeterAI or HIIT Interval Timer & Tracker have ads?

Neither CalorimeterAI nor HIIT Interval Timer & Tracker shows ads.

### Which is updated more often, CalorimeterAI or HIIT Interval Timer & Tracker?

CalorimeterAI ships an update every 3 months, and HIIT Interval Timer & Tracker every 3 weeks. Most recently, CalorimeterAI was updated on October 15, 2026 and HIIT Interval Timer & Tracker 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.*