# KNOCK vs PO

The clearest difference is price: PO at Free against KNOCK's $9.99. PO also leads on rating (5.0 vs 3.9) and update cadence (every 2 days vs every 39 months). KNOCK's advantage is ratings volume (21 vs 1) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

PO is free to download; KNOCK costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PO holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: KNOCK has 21 ratings behind it against 1, so its average is the more settled of the two.

KNOCK ships an update every 39 months, PO every 2 days. Both last shipped on October 11, 2026.

## The numbers

| Metric | KNOCK | PO |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [3.9 (21 ratings)](https://appshunter.io/ios/app/knock/id6443654114/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/po-patchstudio/id6809190034/reviews)** |
| Number of ratings | **21** | 1 |
| Positive reviews | 57.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 2 days** |
| Monetization | Paid | **Free** |
| Size | 9 MB | 12 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Plugins That Knock](https://appshunter.io/developer/1648092173) | [Photon Consulting Limited](https://appshunter.io/developer/6778625337) |

## What reviewers say

### KNOCK

[App page](https://appshunter.io/ios/app/knock/id6443654114)

Enhance your drum sounds with this audio plugin designed for professional mixing. It helps drums cut through the mix with a powerful, impactful sound. Optimized for ease of use, it suits both new and experienced music producers.

**Highlights:** Slap and punch through mixes, Signature drum sound, Extreme ease of use, Seamless workflow integration, Crafted by platinum producer

**Features:** Vision Pro support

**In-app purchases:** none


### PO

[App page](https://appshunter.io/ios/app/po-patchstudio/id6809190034)

Design and edit drum sounds, kits, and patterns for Teenage Engineering's PO-32 Tonic. Transfer your creations to the device via audio. Back up and edit existing sounds, and import/export patches from Microtonic.

**Highlights:** Shape 16 sounds with 21 synth parameters, Program 16-step patterns with accents, Send kits, sounds, or patterns via audio, Back up and decode PO-32 data dumps, Import/export Microtonic patches, Local library with tags and favorites

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

**In-app purchases:** none


## Frequently asked questions

### Is KNOCK free?

KNOCK costs $9.99, with no in-app purchases.

### Is PO free?

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

### Which has better reviews, KNOCK or PO?

PO is rated higher. KNOCK averages 3.9 out of 5 from 21 ratings, while PO averages 5.0 from 1 ratings.

### Do KNOCK or PO have ads?

Neither KNOCK nor PO shows ads.

### Which is updated more often, KNOCK or PO?

KNOCK ships an update every 39 months, and PO every 2 days. Most recently, KNOCK was updated on October 11, 2026 and PO on October 11, 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.*