# Deep Focus Noise & Timer vs NOI

The clearest difference is in-app purchases: NOI at none against Deep Focus Noise & Timer's 4. NOI also leads on iOS requirement (15.1 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Deep Focus Noise & Timer sells 4 in-app purchases, starting at $0.99 per 7 days. NOI asks for nothing beyond the download.

Deep Focus Noise & Timer ships an update weekly, NOI fortnightly. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Deep Focus Noise & Timer | NOI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (26 ratings)](https://appshunter.io/ios/app/deep-focus-noise-and-timer-dpli/id6760627418/reviews)** | — |
| Number of ratings | **26** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | Free with in-app purchases | — |
| Size | 13 MB | 35 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lukasz Solniczek](https://appshunter.io/developer/1032070216) | [DIGITALWORK INDIA PRIVATE LIMITED](https://appshunter.io/developer/1626527624) |

## What reviewers say

### Deep Focus Noise & Timer

[App page](https://appshunter.io/ios/app/deep-focus-noise-and-timer-dpli/id6760627418)

This app generates unique, real-time audio soundscapes designed to prevent neural adaptation and enhance focus for neurodivergent individuals. It offers various noise colors and neurally-validated presets to create a spatial shield against distractions, all while operating 100% offline.

**Highlights:** Real-time generative audio, no loops, Spatial shielding with HRTF, Neurally-validated presets, Brown, pink, speech-shaped, and white noise, 100% offline functionality, Privacy-first, zero data tracking, Battery efficient native synthesis

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dpli weekly | $0.99 | per 7 days |
| Dpli Monthly | $1.99 | per month |
| Dpli Yearly | $12.99 | per year |
| Dpli lifetime access | $14.99 | one-time |


### NOI

[App page](https://appshunter.io/ios/app/noi/id6762500984)

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

**In-app purchases:** none


## Frequently asked questions

### Is Deep Focus Noise & Timer free?

Deep Focus Noise & Timer is free to download, with in-app purchases available.

### Is NOI free?

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

### Do Deep Focus Noise & Timer or NOI have ads?

Neither Deep Focus Noise & Timer nor NOI shows ads.

### Which is updated more often, Deep Focus Noise & Timer or NOI?

Deep Focus Noise & Timer ships an update weekly, and NOI fortnightly. Most recently, Deep Focus Noise & Timer was updated on October 28, 2026 and NOI on October 25, 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.*