# Sigma vs Kine

The clearest difference is rating: Kine at 5.0 against Sigma's 4.5. Kine also leads on review sentiment (100% vs 87%). Sigma's advantage is in-app purchases (none vs 3) and ratings volume (55 vs 2). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Kine sells 3 in-app purchases, starting at $1.99 per month. Sigma asks for nothing beyond the download.

Kine holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Sigma has 55 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 87% of Sigma's written reviews are positive against 100% of Kine's.

Sigma ships an update weekly, Kine fortnightly. Both last shipped on October 25, 2026.

## The numbers

| Metric | Sigma | Kine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (55 ratings)](https://appshunter.io/ios/app/sigma-ai/id6743433033/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/kine/id6761748072/reviews)** |
| Number of ratings | **55** | 2 |
| Positive reviews | 86.8% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 231 MB | 12 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Chaoshi Technology (Shanghai) Co., Ltd.](https://appshunter.io/developer/1520053656) | [定波 刘](https://appshunter.io/developer/1891223422) |

## What reviewers say

### Sigma

[App page](https://appshunter.io/ios/app/sigma-ai/id6743433033)

This app offers a clean and engaging running experience with detailed analysis and personalized AI coaching. Track your runs, visualize your progress, and collect memories of your journeys on a unique map diary.

**Highlights:** Ad-free running experience, Daily, weekly, and monthly analysis, Map diary of runs and moods, AI-powered personalized coaching, Visualized calorie consumption, Data migration from popular wearables

**In-app purchases:** none


### Kine

[App page](https://appshunter.io/ios/app/kine/id6761748072)

This app provides a comprehensive dashboard for Apple Watch users, consolidating heart rate, sleep, activity, and HRV data. It offers actionable insights into performance, recovery, and training rhythm, with features like live heart-rate feedback and recovery prompts.

**Highlights:** Body-state dashboard, Heart rate and HRV tracking, Sleep and activity trends, Live workout heart-rate feedback, Recovery prompts, 24-hour body-dynamics challenges

**Features:** Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kine Pro Monthly | $1.99 | per month |
| Kine Pro yearly | $12.99 | per year |
| Kine Pro Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is Sigma free?

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

### Is Kine free?

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

### Which has better reviews, Sigma or Kine?

Kine is rated higher. Sigma averages 4.5 out of 5 from 55 ratings, while Kine averages 5.0 from 2 ratings.

### Do Sigma or Kine have ads?

Neither Sigma nor Kine shows ads.

### Which is updated more often, Sigma or Kine?

Sigma ships an update weekly, and Kine fortnightly. Most recently, Sigma was updated on October 25, 2026 and Kine on October 25, 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.*