# Opti Calm vs MindViewer

The clearest difference is monetization model: MindViewer at free against Opti Calm's subscription. Opti Calm's advantage is update cadence (every 2 months vs every 4 months) and iOS requirement (9.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Opti Calm ships an update every 2 months, MindViewer every 4 months. The most recent releases landed on September 10, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Opti Calm | MindViewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/opti-calm/id1321696251/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Subscription | **Free** |
| Size | 280 MB | 126 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Optiherence](https://appshunter.io/developer/948846804) | [Neeuro Pte Ltd](https://appshunter.io/developer/960758140) |

## What reviewers say

### Opti Calm

[App page](https://appshunter.io/ios/app/opti-calm/id1321696251)

Train your brain to reach optimal performance patterns with this app. It uses a compatible external brain-sensing accessory to provide visual and audio feedback, guiding you to a state of calm for meditation or high-pressure activities. Improve efficiency and recall your best performance brain patterns.

**Highlights:** Brain activity sensing integration, Visual feedback (score, video, brain representation), Audio feedback (music volume), Calm brain training algorithm, Performance optimization, Meditation and sports training modes

**Features:** macOS Compatibility

**In-app purchases:** none


### MindViewer

[App page](https://appshunter.io/ios/app/mindviewer/id1436471710)

Understand your mental state during activities like studying, working, or resting. This tool visualizes your attention, relaxation, and mental workload using brain signal data from a compatible sensor.

**Highlights:** Visualize mental states, Track attention and relaxation, Measure mental workload, Analyze brain frequencies (delta, theta, alpha, beta, gamma), Record mental state during activities, Compare effectiveness of different activities

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

**In-app purchases:** none


## Frequently asked questions

### Is Opti Calm free?

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

### Is MindViewer free?

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

### Do Opti Calm or MindViewer have ads?

Neither Opti Calm nor MindViewer shows ads.

### Which is updated more often, Opti Calm or MindViewer?

Opti Calm ships an update every 2 months, and MindViewer every 4 months. Most recently, Opti Calm was updated on September 10, 2026 and MindViewer on September 18, 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.*