KNOCK vs PO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KNOCK
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.
- Slap and punch through mixes
- Signature drum sound
- Extreme ease of use
- Seamless workflow integration
- Crafted by platinum producer
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KNOCK is the last plugin you will ever need to make your drums slap and punch through your mix. This plugin was meticulously crafted by platinum producer & award winning sound designer, DECAP. It is inspired by the signature sound of his popular drum kit series DRUMS THAT KNOCK, which has helped shaped the sonics of modern music. KNOCK is optimized for extreme ease of use for beginners and professionals alike. Use KNOCK to make your drums slap, and take you to the next level. Whether you are new to producing, or a seasoned pro, KNOCK will seamlessly fit into your workflow.
PO
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.
- 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
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PO-PatchStudio designs drum sounds, kits and patterns for Teenage Engineering's PO-32 Tonic, then sends them to your Pocket Operator over sound. Free, with no ads and no account. The PO-32 has no USB data connection. It loads new sounds the way an old modem does, by listening through its microphone. So this app does the fiddly part on a proper screen: build a kit, hold your phone next to the PO-32 and press play. WHAT YOU CAN DO - Shape all 16 sounds with the full set of 21 synth parameters, plus both ends of the morph - Program 16-step patterns on the pads, with accents, and hear them before you send - Send a whole kit, a single sound or a pattern to the PO-32 over audio - Back up your PO-32: record its data dump through the microphone and the app decodes it into a kit you can edit - Import Microtonic .mtdrum and .mtpreset patches, including files from older versions of Microtonic, and export your sounds back out - Keep kits, sounds and patterns in a local library with tags and favourites WORKS WITH - PO-32 Tonic - Also sends drum sounds to the PO-35 Speak's built-in Tonic channel HOW TRANSFER WORKS Put the PO-32 in receive mode (press acc + sound), turn your phone's volume up and play the transfer into the PO-32's mic. To back up, start recording in the app, then hold write and press sound on the PO-32. Previews come from an open-source recreation of the PO-32's synth, so they sound close to the hardware but not identical. Once a sound is on the PO-32, it plays through the device's own engine. A NOTE FROM ME I'm a solo developer and a PO-32 owner. PO-PatchStudio stands on the open-source libpo32 library by Eric Lewis and years of reverse-engineering by the Pocket Operator community, which is why it's free. If something is missing or broken, tell me. Not affiliated with or endorsed by Teenage Engineering AB or NuEdge Development AB. Pocket Operator, PO-32 and Tonic are trademarks of Teenage Engineering AB. Microtonic is a trademark of NuEdge Development AB.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | KNOCK | PO |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 3.9 (21 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 57.9% of reviews | — |
| Number of ratings | 21 — better | 1 |
| Update frequency | Every 39 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 9 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Plugins That Knock | Photon Consulting Limited |
Customer experience
KNOCK
PO
In-app purchases
KNOCK
No in-app purchases
PO
No in-app purchases









