# Sigma vs 悠虎户外轨迹

The clearest difference is in-app purchases: Sigma at none against 悠虎户外轨迹's 1. Sigma also leads on iOS requirement (14.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 悠虎户外轨迹 sells 1 one-off in-app purchase. Sigma asks for nothing beyond the download.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Sigma | 悠虎户外轨迹 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (55 ratings)](https://appshunter.io/ios/app/sigma-ai/id6743433033/reviews)** | — |
| Number of ratings | **55** | — |
| Positive reviews | 86.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Free | — |
| Size | 231 MB | 15 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 12+ | 17+ |
| Developer | [Chaoshi Technology (Shanghai) Co., Ltd.](https://appshunter.io/developer/1520053656) | [玉虎 王](https://appshunter.io/developer/6788402360) |

## 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


### 悠虎户外轨迹

[App page](https://appshunter.io/ios/app/id6797769017)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 首发永久版 | $2.99 | one-time |


## Frequently asked questions

### Is Sigma free?

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

### Is 悠虎户外轨迹 free?

悠虎户外轨迹 is free to download, with in-app purchases available.

### Do Sigma or 悠虎户外轨迹 have ads?

Neither Sigma nor 悠虎户外轨迹 shows ads.

### Which is updated more often, Sigma or 悠虎户外轨迹?

Sigma ships an update weekly, and 悠虎户外轨迹 weekly. Most recently, Sigma was updated on October 28, 2026 and 悠虎户外轨迹 on October 24, 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.*