# Liminal Flow vs ADHD Sound App

The clearest difference is monetization model: Liminal Flow at free with in-app purchases against ADHD Sound App's subscription. Liminal Flow also leads on ads (none vs shown) and rating (5.0 vs 4.6). ADHD Sound App's advantage is update cadence (every 2 weeks vs every 2 months) and ratings volume (144 vs 4). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Liminal Flow sells 4 in-app purchases, starting at $4.99 per month and ADHD Sound App sells 12 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Liminal Flow holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: ADHD Sound App has 144 ratings behind it against 4, so its average is the more settled of the two.

Liminal Flow ships an update every 2 months, ADHD Sound App every 2 weeks. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Liminal Flow | ADHD Sound App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/liminal-flow/id6445901345/reviews)** | [4.6 (144 ratings)](https://appshunter.io/ios/app/adhd-sound-app/id6503135887/reviews) |
| Number of ratings | 4 | **144** |
| Positive reviews | — | 45.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 105 MB | 80 MB |
| Requires iOS | **16.0** | 18.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Liminal Flow LLC](https://appshunter.io/developer/1669795723) | [Better Sleep Rise Elite](https://appshunter.io/developer/1707143652) |

## What reviewers say

### Liminal Flow

[App page](https://appshunter.io/ios/app/liminal-flow/id6445901345)

Experience immersive soundscapes designed for meditation, sleep, focus, and deep relaxation. This app generates unique, evolving audio experiences to help regulate your nervous system and cultivate presence. It supports various uses, from personal wellness to professional client sessions.

**Highlights:** Infinitely evolving soundscapes, Supports sleep and meditation, Enhances focus and creativity, Nervous system regulation, Designed for deep listening, Sound refuge for relaxation

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Monthly | $9.99 | per month |
| Annual | $39.99 | per year |
| Annual | $59.99 | per year |


### ADHD Sound App

[App page](https://appshunter.io/ios/app/adhd-sound-app/id6503135887)

This app uses personalized sound therapy and brain-stimulating exercises to improve focus, relaxation, and sleep. It offers an ADHD-friendly mode to help users manage distractions and enhance mental clarity naturally.

**Highlights:** Personalized sound therapy, Brain-stimulating exercises, Focus enhancement, Stress reduction, Deeper sleep promotion, ADHD-friendly mode

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mellow Premium | $4.99 | per 7 days |
| Mellow Premium | $4.99 | per 7 days |
| Mellow Premium | $9.99 | per month |
| UniSleep Premium | $9.99 | per month |
| Mellow Premium | $24.99 | per year |
| Mellow Premium | $24.99 | per year |
| Mellow Premium | $24.99 | per year |
| UniSleep Premium | $29.99 | per year |
| Mellow Premium | $39.99 | per year |
| Mellow Premium | $39.99 | per year |
| ADHD Sound Premium | $47.99 | per year |
| UniSleep Premium Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is Liminal Flow free?

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

### Is ADHD Sound App free?

ADHD Sound App is free to download, with in-app purchases available.

### Which has better reviews, Liminal Flow or ADHD Sound App?

Liminal Flow is rated higher. Liminal Flow averages 5.0 out of 5 from 4 ratings, while ADHD Sound App averages 4.6 from 144 ratings.

### Do Liminal Flow or ADHD Sound App have ads?

ADHD Sound App shows ads; Liminal Flow does not.

### Which is updated more often, Liminal Flow or ADHD Sound App?

Liminal Flow ships an update every 2 months, and ADHD Sound App every 2 weeks. Most recently, Liminal Flow was updated on October 2, 2026 and ADHD Sound App 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.*