# 复旦耳鸣RS vs Sigma

The clearest difference is update cadence: Sigma at weekly against 复旦耳鸣RS's every 5 weeks. Sigma also leads on review sentiment (87% vs 76%). 复旦耳鸣RS's advantage is iOS requirement (11.0 vs 14.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

复旦耳鸣RS ships an update every 5 weeks, Sigma weekly. The most recent releases landed on October 15, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | 复旦耳鸣RS | Sigma |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.4 (52 ratings)](https://appshunter.io/ios/app/sigma-ai/id6743433033/reviews)** |
| Number of ratings | — | **52** |
| Positive reviews | 76.2% of reviews | **86.8% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Weekly** |
| Monetization | Free | Free |
| Size | 154 MB | 231 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 12+ |
| Developer | [复旦大学附属眼耳鼻喉科医院](https://appshunter.io/developer/1369704511) | [Chaoshi Technology (Shanghai) Co., Ltd.](https://appshunter.io/developer/1520053656) |

## What reviewers say

### 复旦耳鸣RS

[App page](https://appshunter.io/ios/app/rs/id1369704512)

This app offers a patented online self-matching system for tinnitus relief. It scientifically customizes sound therapy to help users overcome tinnitus and restore a peaceful auditory experience.

**Highlights:** Online self-matching for tinnitus, Customized sound therapy, Patented technology, Tinnitus relief, Auditory peace restoration

**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 复旦耳鸣RS free?

复旦耳鸣RS is free to download, with no in-app purchases.

### Is Sigma free?

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

### Do 复旦耳鸣RS or Sigma have ads?

Neither 复旦耳鸣RS nor Sigma shows ads.

### Which is updated more often, 复旦耳鸣RS or Sigma?

复旦耳鸣RS ships an update every 5 weeks, and Sigma weekly. Most recently, 复旦耳鸣RS was updated on October 15, 2026 and Sigma on October 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*