# Holon vs PD1

The clearest difference is price: Holon at Free against PD1's $3.99. Holon also leads on device support (4 vs 2) and iOS requirement (12.0 vs 17.5). PD1's advantage is in-app purchases (none vs 2) and update cadence (every 6 days vs every 3 months). On ads and monetization model there is nothing between them.

Holon is free to download; PD1 costs $3.99 up front. Holon sells 2 one-off in-app purchases. PD1 asks for nothing beyond the download.

Holon ships an update every 3 months, PD1 every 6 days. The most recent releases landed on October 3, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Holon | PD1 |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.5 (14 ratings)](https://appshunter.io/ios/app/holon/id1352687747/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 75.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 days** |
| Monetization | Paid | Paid |
| Size | 144 MB | 10 MB |
| Requires iOS | **12.0** | 17.5 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Holonic Systems Oy](https://appshunter.io/developer/1172474856) | [Pedro Yamada](https://appshunter.io/developer/1604183940) |

## What reviewers say

### Holon

[App page](https://appshunter.io/ios/app/holon/id1352687747)

This app transforms your movement through cities into a dynamic, real-time musical score. It uses your physical location and activity to generate interactive synth music, encouraging outdoor exploration and turning listeners into performers.

**Highlights:** Human-powered music generation, Encourages outdoor activity, Zero UI for minimal distraction, Environmentally responsive music, Real-time synth music creation, Optional AirPods and Apple Watch integration

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Apple Watch support | Free | one-time |
| Movesense Support | Free | one-time |


### PD1

[App page](https://appshunter.io/ios/app/pd1-analog-delay/id6450869337)

This app simulates classic analog delay pedals, offering a meaner grit with a ladder filter and random delay-line noise. It's an audio-unit effect designed for musicians seeking unique delay sounds.

**Highlights:** Analog delay simulation, Ladder filter for meaner grit, Random delay-line noise, Audio-unit effect plugin, Classic pedal sound recreation

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Holon free?

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

### Is PD1 free?

PD1 costs $3.99, with no in-app purchases.

### Do Holon or PD1 have ads?

Neither Holon nor PD1 shows ads.

### Which is updated more often, Holon or PD1?

Holon ships an update every 3 months, and PD1 every 6 days. Most recently, Holon was updated on October 3, 2026 and PD1 on October 15, 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.*