FAC Medusa vs KNOCK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FAC Medusa
This versatile audio processor offers a characterful compressor with multiple dynamic controls. It allows for detailed sound shaping through 3-band tone controls, split frequency compression, and both downward and upward compression types. Enhance your audio with parallel compression, a brickwall limiter, and precise metering.
- Characterful compressor with multiple dynamic processors
- 3-Band input tone controls with adjustable crossovers
- Split/Sum frequency bands before compression
- Downward and Upward compression types
- Parallel compression and master Brickwall limiter
- Sidechain and multi-outs support
- Precise metering with decibel values
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• Gentle, natural, or aggressive and colorful compressor • Combine different dynamic processors into a single and easy to use unit • 3-Band input tone controls with adjustable crossovers and saturators • Split/Sum frequency bands before compression • Two dynamic controls: Downward or Upward • Range and knee controls to limit compression depth • Parallel compression and master Brickwall limiter • Sidechain and multi-outs support • Precise metering with decibel values • Advanced Responsive Design, portrait and landscape views • AuV3 for iOS (iPad/iPhone) Compressors are probably the most used audio processors and you surely know what it's all about and how it can help to control the dynamic range of your audio signal. So let's get straight to what makes FAC Medusa a new versatile and characterful compressor! FAC Medusa combines different dynamic processors into a single and easy to use unit, the input signal flows along the following stages: 1) "Pre-amp with tone control and saturation circuit" The input signal is split into three bands of frequencies (Low, Mid and High) according two adjustable crossover points. Setting the level and the saturation amount of each frequency band will definitely make the effect more natural or characterful. 2) "Compression" In addition to the usual controls you may expect, FAC Medusa also provides two types of compression. Downward compression, which is obviously the most common, decreases the level of audio signal above the threshold. And also Upward compression which is less known, despite powerful, and increases the level of audio signal below the threshold. The compression can operate either on the SUM of the frequency bands (L+M+H) or on each frequency band coming from stage 1. 3) "Parallel compression and Brickwall limiter" The master Brickwall limiter is optional and will ensure that the output of stage 2, possibly blended with the original audio signal, remain under control. The limiter comes with threshold and release time controls. As you have realized FAC Medusa has many faces: gentle, natural, or aggressive and colorful. Choose the one you want and be prepared for an exciting sound design experience. Whether you are a budding music producer or passionate amateur musician in any genre, you will definitely find a happy use for it! - AuV3 and Standalone App - To use the sidechain and/or to output the additional three bands, you need a host able to provide to the AuV3 an input bus and three additional output busses The documentation is available at fredantoncorvest.com/FAC_Medusa.html
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.
Screenshots
Verdict
The clearest difference is rating: FAC Medusa at 5.0 against KNOCK's 4.0. FAC Medusa also leads on review sentiment (100% vs 58%) and update cadence (every 4 months vs every 39 months). KNOCK's advantage is in-app purchases (none vs 3) and chart position (#195 vs unranked). On price, ratings volume, ads and monetization model 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
FAC Medusa costs $9.99 and KNOCK $9.99 up front. FAC Medusa sells 3 one-off in-app purchases. KNOCK asks for nothing beyond the download.
FAC Medusa holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 23 and 23 respectively. Written reviews point the same way: 100% of FAC Medusa's written reviews are positive against 58% of KNOCK's.
FAC Medusa ships an update every 4 months, KNOCK every 39 months. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.
| Parameter | FAC Medusa | KNOCK |
|---|---|---|
| Price | $9.99 | $9.99 |
| Rating | 5.0 (23 ratings) — better | 4.0 (23 ratings) |
| Positive reviews | 100.0% of reviews — better | 57.9% of reviews |
| Number of ratings | 23 | 23 |
| Update frequency | Every 4 months — better | Every 39 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Paid |
| Best chart rank | — | #195 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Frederic Corvest | Plugins That Knock |
Customer experience
FAC Medusa
KNOCK
In-app purchases
FAC Medusa
- Small Tip$1.99
- Medium Tip$4.99
- Large Tip$14.99
KNOCK
No in-app purchases








