# NeuroVIZR vs O2CO2

The clearest difference is update cadence: NeuroVIZR at weekly against O2CO2's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. NeuroVIZR sells 4 in-app purchases, starting at $8.89 per month and O2CO2 sells 2 in-app purchases, starting at $3.99 per year. Whichever you choose, the download price is not the number that matters.

NeuroVIZR ships an update weekly, O2CO2 every 3 weeks. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | NeuroVIZR | O2CO2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (141 ratings)](https://appshunter.io/ios/app/neurovizr/id1553597738/reviews)** | — |
| Number of ratings | **141** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 118 MB | 353 MB |
| Requires iOS | 15.5 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | +4 | 4+ |
| Developer | [Vizr Technology OÜ](https://appshunter.io/developer/1896332195) | [ELIOTT ROMAIN-SAVARD](https://appshunter.io/developer/6813168270) |

## What reviewers say

### NeuroVIZR

[App page](https://appshunter.io/ios/app/neurovizr/id1553597738)

This app uses light and sound experiences with a companion device to provide brain exercise and improve cognitive function. It offers sessions for better sleep, brain gym, and achieving specific mind states through neuroplastic changes.

**Highlights:** Light and sound brain exercise, Companion device integration, Sessions for better sleep, Brain Gym exercises, Mind state customization, Neuroplasticity enhancement

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $8.89 | per month |
| Premium Plus Monthly | $14.90 | per month |
| Premium Yearly | $85.00 | per year |
| Premium Plus Yearly | $142.99 | per year |


### O2CO2

[App page](https://appshunter.io/ios/app/o2co2/id6813168268)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| O2CO2 Premium Annual | $3.99 | per year |
| O2CO2 Premium Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is NeuroVIZR free?

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

### Is O2CO2 free?

O2CO2 is free to download, with in-app purchases available.

### Do NeuroVIZR or O2CO2 have ads?

Neither NeuroVIZR nor O2CO2 shows ads.

### Which is updated more often, NeuroVIZR or O2CO2?

NeuroVIZR ships an update weekly, and O2CO2 every 3 weeks. Most recently, NeuroVIZR was updated on November 7, 2026 and O2CO2 on October 31, 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.*