# Sigma vs 轻练

The clearest difference is rating: 轻练 at 5.0 against Sigma's 4.5. Sigma's advantage is in-app purchases (none vs 9) and review sentiment (87% vs 55%). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 轻练 sells 9 in-app purchases, starting at $6.99 per month. Sigma asks for nothing beyond the download.

轻练 holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Sigma has 59 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 87% of Sigma's written reviews are positive against 55% of 轻练's, so the app with the better star average is not the one people write more warmly about.

Sigma ships an update weekly, 轻练 every 11 days. The most recent releases landed on November 12, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Sigma | 轻练 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (59 ratings)](https://appshunter.io/ios/app/sigma-ai/id6743433033/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ai-and/id6760098662/reviews)** |
| Number of ratings | **59** | 1 |
| Positive reviews | **86.9% of reviews** | 55.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 11 days |
| Monetization | **Free** | Freemium |
| Size | 233 MB | 136 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Chaoshi Technology (Shanghai) Co., Ltd.](https://appshunter.io/developer/1520053656) | [Chongqing Youzhimeng Tech](https://appshunter.io/developer/1826490696) |

## 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.

**Highlights:** Ad-free running experience, Multi-dimensional analysis views, Map diary of runs and moods, AI partner with personalized advice, Visualized calorie consumption, Data migration from popular wearables

**In-app purchases:** none


### 轻练

[App page](https://appshunter.io/ios/app/ai-and/id6760098662)

This app provides personalized fitness and health management. It creates custom workout plans, tracks various health data, and offers professional analysis to help users build healthy habits. Features include 3D video guidance, AI coaching, and smart data recording for exercise and diet.

**Highlights:** Personalized workout plans, 3D video exercise guidance, Automatic health data tracking, AI fitness and diet consultation, Smart calorie and weight logging, Customizable daily calorie intake plans

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 轻练-月会员订阅 | $6.99 | per month |
| 轻练-月会员订阅1 | $7.99 | per month |
| 轻练-年会员(优惠3) | $12.99 | per year |
| 轻练-年会员(优惠2) | $19.99 | per year |
| 轻练-年会员订阅优惠1 | $19.99 | per year |
| 轻练-年会员订阅 | $22.99 | per year |
| 轻练-永久会员(优惠2) | $22.99 | one-time |
| 轻练-永久会员(优惠1) | $24.99 | one-time |
| 轻练-永久会员 | $29.99 | one-time |


## Frequently asked questions

### Is Sigma free?

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

### Is 轻练 free?

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

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

轻练 is rated higher. Sigma averages 4.5 out of 5 from 59 ratings, while 轻练 averages 5.0 from 1 ratings.

### Do Sigma or 轻练 have ads?

Neither Sigma nor 轻练 shows ads.

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

Sigma ships an update weekly, and 轻练 every 11 days. Most recently, Sigma was updated on November 12, 2026 and 轻练 on November 9, 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.*