# Outbase vs Sigma

The clearest difference is rating: Sigma at 4.4 against Outbase's 3.0. Sigma also leads on review sentiment (86% vs 45%) and ratings volume (47 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Sigma holds the better App Store score, 4.4 against 3.0. That said, the two scores are not equally well evidenced: Sigma has 47 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 45% of Outbase's written reviews are positive against 86% of Sigma's.

Outbase ships an update every 2 weeks, Sigma weekly. The most recent releases landed on August 28, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Outbase | Sigma |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/outbase/id6739030517/reviews) | **[4.4 (47 ratings)](https://appshunter.io/ios/app/sigma-ai/id6743433033/reviews)** |
| Number of ratings | 1 | **47** |
| Positive reviews | 45.5% of reviews | **86.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | Free | Free |
| Size | 117 MB | 217 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Beijing Shiyuan Zaowu Culture Co., Ltd.](https://appshunter.io/developer/1586936933) | [Chaoshi Technology (Shanghai) Co., Ltd.](https://appshunter.io/developer/1520053656) |

## What reviewers say

### Outbase

[App page](https://appshunter.io/ios/app/outbase/id6739030517)

Connect with friends and the world through sports. Compete in real-time challenges, discover local hotspots, and build exclusive sports clubs to achieve new milestones together. Turn solo workouts into a vibrant community experience.

**Highlights:** Real-time sports challenges, Social feed with activity updates, Create and join sports clubs, Leaderboards and performance tracking, Connect with smart devices, Share workout data and achievements

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Outbase free?

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

### Is Sigma free?

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

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

Sigma is rated higher. Outbase averages 3.0 out of 5 from 1 ratings, while Sigma averages 4.4 from 47 ratings.

### Do Outbase or Sigma have ads?

Neither Outbase nor Sigma shows ads.

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

Outbase ships an update every 2 weeks, and Sigma weekly. Most recently, Outbase was updated on August 28, 2026 and Sigma on September 22, 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.*