# Cinder vs Kai AI

The clearest difference is update cadence: Kai AI at daily against Cinder's every 8 days. Kai AI also leads on iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Cinder sells 3 in-app purchases, starting at $2.99 per month and Kai AI sells 3 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

Cinder ships an update every 8 days, Kai AI daily. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Cinder | Kai AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (9 ratings)](https://appshunter.io/ios/app/cinder-plan-and-track-workouts/id6754781687/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Daily** |
| Monetization | Freemium | — |
| Size | 71 MB | 53 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Haplo, LLC](https://appshunter.io/developer/1476210690) | [Orel Bereshit](https://appshunter.io/developer/6774994912) |

## What reviewers say

### Cinder

[App page](https://appshunter.io/ios/app/cinder-plan-and-track-workouts/id6754781687)

Log exercises, sets, reps, and weights with an intuitive interface. Visualize progress with custom charts and AI-powered insights to optimize performance. Seamlessly integrates with Apple devices and HealthKit.

**Highlights:** Log exercises, sets, reps, and weights, Visualize progress with custom charts, AI-powered workout insights, Live Activities for Lock Screen tracking, Apple Watch companion app, HealthKit integration, Smart calendar for training history

**Features:** macOS Compatibility, Siri integration, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cinder Premium Monthly | $2.99 | per month |
| Cinder Premium Annual | $17.99 | per year |
| Cinder Premium Lifetime | $30.00 | one-time |


### Kai AI

[App page](https://appshunter.io/ios/app/kai-ai/id6774994910)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kai AI Monthly | $7.99 | per month |
| Kai AI Annual | $49.99 | per year |
| Kai AI Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is Cinder free?

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

### Is Kai AI free?

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

### Do Cinder or Kai AI have ads?

Neither Cinder nor Kai AI shows ads.

### Which is updated more often, Cinder or Kai AI?

Cinder ships an update every 8 days, and Kai AI daily. Most recently, Cinder was updated on November 7, 2026 and Kai AI on November 5, 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.*