Comparison

EQ550 vs Kompresor

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

EQ550

This audio effect plugin emulates classic American EQs from the late 1960s, offering precise control over equalization with unique Proportional Q technology. It functions as a standalone app or an AUv3 plugin for compatible hosts, providing a flexible and characterful sound shaping experience.

Highlights
  • Standalone and AUv3 plugin
  • 3 bands of classic American equalization
  • Proportional Q filter bandwidth
  • Stereo, Mid, or Side EQ modes
  • Undo/Redo and A/B comparison
  • Scalable GUI
Read full description

EQ550 AUv3 plug-in — comes as time-limited Demo-version for you to try. It gives you 5 minutes of Free play time. (You can reload the EQ550 AUv3 plug-in as many times as you want, thereby you get the Demo period again and again.) Unlimited version of EQ550 AUv3 plug-in comes as In-App Purchase. The EQ550 faithfully captures the punch, low-frequency transparency, and ultra-tight imaging of iconic American EQs of the late 1960’s. Making use of Proportional Q intuitively widens the filter bandwidth at minimal settings and narrows it at higher settings without the need for additional bandwidth controls. This unique feature minimizes the «phase-shift» sound found in many equalizers. Features: • Standalone and AUv3 plug-in; • 3 bands of classic American equalization; • Each band offers 7 selected frequency centers; • Maximum 15dB of boost/cut per band; • EQ Band 1 and 3 offer shelf/peak switching; • Proportional Q narrows filter Q at extremes; • Stereo (Mono), Mid or Side EQ modes; • Undo/Redo; • A/B comparison; • 2x/4x/8x Upsampling; • Macro controllers; • Built-in Gain Match; • Scalable GUI. The EQ550 provides reciprocal equalization at 21 points in 5 steps of boost to a maximum of 15dB of gain at each point. The twenty one equalization points are divided into three overlapping ranges. The high and low frequency ranges are individually selectable as either peaking or shelving, and a band-pass filter may be inserted independently of all other selected equalization settings. Frequency ranges and boost/cut are selected by switches, and a pushbutton «IN» switch allows the EQ to be silently introduced to the signal path. A small toggle switch is used to insert the band-pass filter into the EQ550. The EQ550 extends the features of the original hardware and joins the flexibility of the digital world to the character of the analog processing. Allows you to choose between equalizer modes (Stereo, Mid, Side) and remove analogue saturation from the processing circuit to deliver pure digital sound. To use EQ550 as a plug-in, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — EQ550 will appear in the list of Audio Unit extensions for effect plug-ins in the host app.

About

Kompresor

This audio tool offers versatile compression with multiple algorithms and processing modes for various signals, from mix bus to mastering. It provides fine-tuning options like DELTA monitoring and external sidechaining for precise audio manipulation.

Highlights
  • Multiple compression algorithms
  • Five processing modes (stereo, mid, side, left, right)
  • External sidechain input
  • DELTA monitoring
  • Fast attack time (0.01ms)
  • Peak and RMS detectors
  • AUv3 plugin compatibility
Read full description

Kompresor is a versatile and powerful, yet easy to use, compressor. With several compression algorithms and processing modes under the hood, Kompresor is suitable for use on a wide variety of signals, on the mix bus, or for mastering. For the most transparent compression, ideal for mastering, use AUTO or "AUTO A" envelopes. Use PROGRAM envelope for an easy mix bus gluing effect. If you are after the classic style compression switch to feedback configuration. Select RMS detector for a smoother compression suitable for vocals, guitars, etc. Five processing modes allow you to go from the standard stereo (L/R) compression mode to more surgical modes like compressing the mid (sum) or side (diff) signal only, or compressing exclusively the left or right channel. To help you fine tune compression parameters, enable DELTA feature to monitor only the difference between the uncompressed and compressed signal. Last but not least, Kompresor has an external side chain input for those times when you need to duck one signal based on another one. Features: – Four types of compression Attack/Release envelopes SIMPLE, AUTO, AUTO A, and PROGRAM. – Five processing modes LEFT, RIGHT, MID, SIDE, STEREO – External sidechaining (only in hosts that support external sidechaining) – Very fast attack time - 0.01ms – Ratio up to 30:1 – Soft knee up to 50dB width – Feedforward and feedback configuration – Peak and RMS detectors – Sidechain high pass filter – Parallel processing – Monitoring only the difference between the uncompressed and compressed signal – Intelligent auto makeup gain – 4x oversampling to avoid aliasing – Plenty of factory presets to provide a starting point Kompresor is primarily an AUv3 effect. To use Kompresor as a plug-in, you will need an AUv3 compatible host such as Garageband, AUM, etc. Kompresor application is there to provide a user manual and a chance to use Kompresor with the microphone input. You can try Kompresor on a macOS or a Windows based machine by downloading the demo version of the plug-in (VST3, AUv2, AAX) from our website (https://www.shatteredglassaudio.com) and running it in a DAW of your choice. Sonically speaking there are no differences between the iOS and macOS/Windows versions of Kompresor.

Screenshots

EQ5504 screens
Kompresor2 screens

Verdict

The call

The clearest difference is price: EQ550 at Free against Kompresor's $24.99. EQ550 also leads on update cadence (monthly vs every 8 months) and iOS requirement (10.0 vs 15.8). Kompresor's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 1). On ratings volume, ads 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

CostPrice · In-app purchases · Ads · Monetization

EQ550 is free to download; Kompresor costs $24.99 up front. EQ550 sells 1 one-off in-app purchase. Kompresor asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Kompresor holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 11 and 4 respectively.

UpkeepUpdate frequency

EQ550 ships an update monthly, Kompresor every 8 months. Both last shipped on October 24, 2026.

Scorecard6 real differences · 4 level
EQ550 versus Kompresor: the parameters behind the verdict, then further details
ParameterEQ550Kompresor
PriceFree — better$24.99
Rating4.5 (11 ratings)5.0 (4 ratings) — better
Positive reviews33.3% of reviews—
Number of ratings11 — better4
Update frequencyMonthly — betterEvery 8 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better15.8
Further details — not scored
Size20 MB4 MB
Age rating4+4+
DeveloperRRS, OOOShattered Glass Audio

Customer experience

EQ550

All ratings11 ratings
Positive81.8%
Neutral9.1%
Negative9.1%
Written reviews3 reviews
Positive33.3%
Neutral33.3%
Negative33.3%

Kompresor

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

EQ550

One-time1
  • RRS EQ550 Unlimited$4.99
None

Kompresor

No in-app purchases

Questions

Is EQ550 free?
EQ550 is free to download, with in-app purchases available.
Is Kompresor free?
Kompresor costs $24.99, with no in-app purchases.
Which has better reviews, EQ550 or Kompresor?
Kompresor is rated higher. EQ550 averages 4.5 out of 5 from 11 ratings, while Kompresor averages 5.0 from 4 ratings.
Do EQ550 or Kompresor have ads?
Neither EQ550 nor Kompresor shows ads.
Which is updated more often, EQ550 or Kompresor?
EQ550 ships an update monthly, and Kompresor every 8 months. Most recently, EQ550 was updated on October 24, 2026 and Kompresor on October 24, 2026.

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