# Round vs Calybe AI

The clearest difference is update cadence: Calybe AI at every 3 days against Round's every 9 days. Calybe AI also leads on iOS requirement (15.1 vs 17.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Round ships an update every 9 days, Calybe AI every 3 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Round | Calybe AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/round-hiit-workout-timer/id6757195833/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 3 days** |
| Monetization | Free | — |
| Size | 37 MB | 157 MB |
| Requires iOS | 17.2 | **15.1** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ryosuke Nakayama](https://appshunter.io/developer/1865209768) | [Sankat Mochan](https://appshunter.io/developer/6776510930) |

## What reviewers say

### Round

[App page](https://appshunter.io/ios/app/round-hiit-workout-timer/id6757195833)

This interval timer is designed for high-intensity interval training (HIIT), Tabata, and circuit workouts. It allows users to create custom routines with multiple exercises and track their progress. The app offers haptic alerts and can be controlled from an Apple Watch.

**Highlights:** Customizable interval routines, HIIT, Tabata, and circuit training support, Apple Watch control, Haptic alerts for round changes, Visual arc timer, Workout progress tracking, Apple Health integration

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Calybe AI

[App page](https://appshunter.io/ios/app/calybe-ai-calorie-counter/id6777555056)

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

**In-app purchases:** none


## Frequently asked questions

### Is Round free?

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

### Is Calybe AI free?

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

### Do Round or Calybe AI have ads?

Neither Round nor Calybe AI shows ads.

### Which is updated more often, Round or Calybe AI?

Round ships an update every 9 days, and Calybe AI every 3 days. Most recently, Round was updated on November 5, 2026 and Calybe AI on October 31, 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.*