# Nerva vs Belly Boi

The clearest difference is rating: Nerva at 4.7 against Belly Boi's 2.5. Nerva also leads on update cadence (every 8 days vs every 6 months) and ratings volume (15K vs 2). Belly Boi's advantage is device support (5 vs 3). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Nerva sells 4 in-app purchases, starting at $99.00 per month and Belly Boi sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Nerva holds the better App Store score, 4.7 against 2.5. That said, the two scores are not equally well evidenced: Nerva has 15K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 72% of Nerva's written reviews are positive against 50% of Belly Boi's.

Nerva ships an update every 8 days, Belly Boi every 6 months. The most recent releases landed on October 26, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Nerva | Belly Boi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (15K ratings)](https://appshunter.io/ios/app/nerva-gut-brain-program/id1467398796/reviews)** | [2.5 (2 ratings)](https://appshunter.io/ios/app/belly-boi/id1592909416/reviews) |
| Number of ratings | **15K** | 2 |
| Positive reviews | **72.4% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 6 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 138 MB | 36 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Mindset Health Pty Ltd](https://appshunter.io/developer/1255073245) | [Sleepy Boy Studios Ltd](https://appshunter.io/developer/1105841781) |

## What reviewers say

### Nerva

[App page](https://appshunter.io/ios/app/nerva-gut-brain-program/id1467398796)

This app offers a personalized gut-brain therapy program to manage symptoms of IBS, FD, GERD, and other gut-brain disorders. It aims to retrain the nervous system and improve communication between the gut and brain through daily sessions and practical tools.

**Highlights:** Personalized gut-brain therapy program, Daily 15-minute retraining sessions, Flare-up management tools, Long-term symptom maintenance plan, AI-driven personalization, Evidence-based clinical research

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Nerva IBS program (Monthly) | $99.00 | per month |
| Nerva IBS program (3 Month) | $149.00 | per 3 months |
| 30% Off Nerva IBS (3 Month) | $149.00 | per 3 months |
| Nerva Full Access | $199.00 | per year |

**What reviewers like**

- 🚀 Effective for symptom reduction
- 👍 Calming and relaxing sessions
- 💡 Helpful for managing stress and anxiety
- 👍 Positive affirmations and education
- 🚀 Quick improvements seen by some users

**What reviewers complain about**

- 🔁 Repetitive nature of sessions
- 💰 Expensive subscription cost
- 🔍 Lack of customization options
- 🐛 Technical issues with app functionality

**Reported bugs**

- App getting stuck on certain days
- Difficulty accessing previous sessions
- Inconsistent user experience across devices

**Requested features**

- More variety in guided visualizations
- Ability to skip or replace certain sessions
- Maintenance plan with reduced pricing
- Offline access to recordings


### Belly Boi

[App page](https://appshunter.io/ios/app/belly-boi/id1592909416)

This app helps you monitor your daily mood, stomach health, and food intake. It features a journal, custom tags, and image additions for each entry. Track your gut mood for IBS and gastrointestinal issues with monthly and annual statistics.

**Highlights:** Daily mood tracking, Journal entry writing, Gut mood and IBS tracking, Food intake logging, Custom tags for entries, Monthly and annual stats, Cross-device sync

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support the app | $2.99 | one-time |


## Frequently asked questions

### Is Nerva free?

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

### Is Belly Boi free?

Belly Boi is free to download, with in-app purchases available.

### Which has better reviews, Nerva or Belly Boi?

Nerva is rated higher. Nerva averages 4.7 out of 5 from 15K ratings, while Belly Boi averages 2.5 from 2 ratings.

### Do Nerva or Belly Boi have ads?

Neither Nerva nor Belly Boi shows ads.

### Which is updated more often, Nerva or Belly Boi?

Nerva ships an update every 8 days, and Belly Boi every 6 months. Most recently, Nerva was updated on October 26, 2026 and Belly Boi on October 17, 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.*