# Sigma vs R211 Run

The clearest difference is in-app purchases: Sigma at none against R211 Run's 2. Sigma also leads on update cadence (weekly vs every 2 weeks). R211 Run's advantage is iOS requirement (12.0 vs 14.0). On price, ads and device support there is nothing between them.

Both are free to download. R211 Run sells 2 one-off in-app purchases. Sigma asks for nothing beyond the download.

Sigma ships an update weekly, R211 Run every 2 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | Sigma | R211 Run |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (56 ratings)](https://appshunter.io/ios/app/sigma-ai/id6743433033/reviews)** | — |
| Number of ratings | **56** | — |
| Positive reviews | 86.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Free | — |
| Size | 232 MB | 32 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Chaoshi Technology (Shanghai) Co., Ltd.](https://appshunter.io/developer/1520053656) | [Kouyi (Hangzhou) Sports Technology Co Ltd](https://appshunter.io/developer/1812554119) |

## What reviewers say

### Sigma

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

This app offers a distraction-free running experience with detailed daily, weekly, and monthly analysis of your runs. It visualizes your running data and creates a map diary of your routes and moods, with AI-powered personalized coaching based on your history.

**Highlights:** Distraction-free running recording, Daily, weekly, monthly analysis, Map diary of routes and moods, AI-powered personalized coaching, Visualized calorie consumption, Data migration from multiple devices

**In-app purchases:** none


### R211 Run

[App page](https://appshunter.io/ios/app/r211-run/id6745493817)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Half Marathon Training Plan | $14.99 | one-time |
| Marathon Training Plan | $24.99 | one-time |


## Frequently asked questions

### Is Sigma free?

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

### Is R211 Run free?

R211 Run is free to download, with in-app purchases available.

### Do Sigma or R211 Run have ads?

Neither Sigma nor R211 Run shows ads.

### Which is updated more often, Sigma or R211 Run?

Sigma ships an update weekly, and R211 Run every 2 weeks. Most recently, Sigma was updated on October 30, 2026 and R211 Run on October 30, 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.*