# Ooooo vs NeuralStack.io™

The clearest difference is in-app purchases: Ooooo at none against NeuralStack.io™'s 2. Ooooo also leads on ratings volume (121 vs 9). NeuralStack.io™'s advantage is update cadence (every 3 weeks vs every 5 months) and rating (5.0 vs 4.8). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. NeuralStack.io™ sells 2 in-app purchases, starting at $2.99 per month. Ooooo asks for nothing beyond the download.

NeuralStack.io™ holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Ooooo has 121 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 96% of Ooooo's written reviews are positive against 100% of NeuralStack.io™'s.

Ooooo ships an update every 5 months, NeuralStack.io™ every 3 weeks. The most recent releases landed on September 21, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Ooooo | NeuralStack.io™ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (121 ratings)](https://appshunter.io/ios/app/ooooo/id1244537282/reviews) | **[5.0 (9 ratings)](https://appshunter.io/ios/app/neuralstackio-focus-and-sleep/id6502728529/reviews)** |
| Number of ratings | **121** | 9 |
| Positive reviews | 95.8% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 179 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pavlos Tsochantaris](https://appshunter.io/developer/328330654) | [Banzai Labs](https://appshunter.io/developer/305909501) |

## What reviewers say

### Ooooo

[App page](https://appshunter.io/ios/app/ooooo/id1244537282)

This app generates binaural beat audio waves to help you achieve specific mind-states like sleep, meditation, or energy. It offers a simple, offline experience without ads or in-app purchases, and includes an Apple Watch app for convenience.

**Highlights:** Binaural beat audio generation, Supports sleep, meditation, relaxation, and energy states, Offline functionality, No ads or in-app purchases, Apple Watch app included, Optional white/brown noise masking

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

**In-app purchases:** none

**What reviewers like**

- 👍 Free and no ads
- 👍 Simple and easy to use
- 👍 Highly customizable
- 👍 Works in the background
- 👍 Effective for focus and sleep

**What reviewers complain about**

- 🐛 Frequency accuracy issues
- 🐛 Limited frequency range (caps at 500Hz for some)
- 🐛 Stereo might be broken for some users
- 🐛 Small controls on iPad/Pro
- 🐛 Does not support AirPlay

**Reported bugs**

- App closes when phone goes to sleep or switches apps (needs background capability)
- Frequency displayed does not match actual played frequency
- Slider caps out at 500hz for some users
- Stereo may not be working correctly for some users

**Requested features**

- Higher mhz frequencies
- Numerical input for precision
- Green Noise option
- Program sequences of beats and transitions (auto-pilot)
- Dial into specific frequencies to the thousandth decimal point


### NeuralStack.io™

[App page](https://appshunter.io/ios/app/neuralstackio-focus-and-sleep/id6502728529)

Create personalized audio experiences for focus, sleep, and mindset enhancement. Combine brainwave entrainment, guided breathing, and ambient sounds to build custom 'Stacks'. Listen offline and alongside other apps.

**Highlights:** Customizable Stacks with multi-stage elements, Brainwave entrainment (0.5-100 Hz), Guided breathing programs, Layered ambience and nature sounds, Offline listening, Integration with other apps, Stack playlists

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NeuralStack.io Monthly Subscription | $2.99 | per month |
| NeuralStack.io Annual Subscription | $24.99 | per year |


## Frequently asked questions

### Is Ooooo free?

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

### Is NeuralStack.io™ free?

NeuralStack.io™ is free to download, with in-app purchases available.

### Which has better reviews, Ooooo or NeuralStack.io™?

NeuralStack.io™ is rated higher. Ooooo averages 4.8 out of 5 from 121 ratings, while NeuralStack.io™ averages 5.0 from 9 ratings.

### Do Ooooo or NeuralStack.io™ have ads?

Neither Ooooo nor NeuralStack.io™ shows ads.

### Which is updated more often, Ooooo or NeuralStack.io™?

Ooooo ships an update every 5 months, and NeuralStack.io™ every 3 weeks. Most recently, Ooooo was updated on September 21, 2026 and NeuralStack.io™ on October 6, 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.*