# Sigma vs Arcus VBT

The clearest difference is rating: Arcus VBT at 5.0 against Sigma's 4.4. Arcus VBT also leads on review sentiment (100% vs 87%). Sigma's advantage is in-app purchases (none vs 10) and ratings volume (54 vs 6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Arcus VBT sells 10 in-app purchases, starting at $6.69 per month. Sigma asks for nothing beyond the download.

Arcus VBT holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Sigma has 54 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 87% of Sigma's written reviews are positive against 100% of Arcus VBT's.

Both ship on a similar rhythm, roughly weekly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Sigma | Arcus VBT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (54 ratings)](https://appshunter.io/ios/app/sigma-ai/id6743433033/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/arcus-vbt/id6778055009/reviews)** |
| Number of ratings | **54** | 6 |
| Positive reviews | 86.8% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | **Free** | Freemium |
| Size | 231 MB | 164 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Chaoshi Technology (Shanghai) Co., Ltd.](https://appshunter.io/developer/1520053656) | [夏雯 姚](https://appshunter.io/developer/1896671999) |

## 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


### Arcus VBT

[App page](https://appshunter.io/ios/app/arcus-vbt/id6778055009)

Analyze barbell training with real-time or imported video analysis. Track key velocity metrics, review reps, and monitor progress over time with detailed charts and cloud sync. Designed for strength athletes and coaches seeking to enhance their training.

**Highlights:** Live camera tracking, Video import analysis, Barbell velocity metrics, Rep-by-rep history, Progress charts, Cloud sync

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Jump Pro Monthly | $6.69 | per month |
| Lift Pro Monthly | $7.99 | per month |
| Ultra Monthly | $10.99 | per month |
| Arcus Coach 10 Monthly | $19.99 | per month |
| Arcus Coach 20 Monthly | $29.99 | per month |
| Jump Pro Yearly | $45.90 | per year |
| Lift Pro Yearly | $54.90 | per year |
| Ultra Yearly | $75.90 | per year |
| Arcus Coach 10 Yearly | $149.99 | per year |
| Arcus Coach 20 Yearly | $229.99 | per year |


## Frequently asked questions

### Is Sigma free?

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

### Is Arcus VBT free?

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

### Which has better reviews, Sigma or Arcus VBT?

Arcus VBT is rated higher. Sigma averages 4.4 out of 5 from 54 ratings, while Arcus VBT averages 5.0 from 6 ratings.

### Do Sigma or Arcus VBT have ads?

Neither Sigma nor Arcus VBT shows ads.

### Which is updated more often, Sigma or Arcus VBT?

Sigma ships an update weekly, and Arcus VBT weekly. Most recently, Sigma was updated on October 24, 2026 and Arcus VBT 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.*