# Whizz vs KettleCore Sync

The clearest difference is in-app purchases: KettleCore Sync at none against Whizz's 2. Whizz's advantage is update cadence (every 9 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Whizz sells 2 in-app purchases, starting at $3.99 per month. KettleCore Sync asks for nothing beyond the download.

Whizz ships an update every 9 days, KettleCore Sync every 2 months. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Whizz | KettleCore Sync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/whizz/id6497229656/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 81 MB | 128 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [OptimaSport](https://appshunter.io/developer/1741307739) | [Ekklo](https://appshunter.io/developer/1730579732) |

## What reviewers say

### Whizz

[App page](https://appshunter.io/ios/app/whizz/id6497229656)

This app provides personalized indoor cardio training plans generated by AI. It tracks your performance with detailed statistics, offers global challenges, and supports various cardio machines for weight loss, fitness improvement, or competition preparation.

**Highlights:** AI-generated personalized training plans, Supports various cardio machines, Calculates fitness indicators (VO₂max, BMI), Tracks session progress and statistics, Global community challenges and rankings, Instant access to training history

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $3.99 | per month |
| Yearly subscription | $29.90 | per year |


### KettleCore Sync

[App page](https://appshunter.io/ios/app/kettlecore-sync/id6759012136)

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

**In-app purchases:** none


## Frequently asked questions

### Is Whizz free?

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

### Is KettleCore Sync free?

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

### Do Whizz or KettleCore Sync have ads?

Neither Whizz nor KettleCore Sync shows ads.

### Which is updated more often, Whizz or KettleCore Sync?

Whizz ships an update every 9 days, and KettleCore Sync every 2 months. Most recently, Whizz was updated on October 8, 2026 and KettleCore Sync on October 6, 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.*