Comparison

Comp 609 vs Fair Limiter

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

Head to head
About

Comp 609

This audio effect plugin emulates analog compressors, offering extensive control over attack, release, ratio, and saturation. It supports various operation modes, external sidechaining, and parallel compression for detailed audio shaping. A demo version is available with a time limit.

Highlights
  • Analog compressor emulation
  • Adjustable attack, release, and ratio
  • External sidechain with high-pass filter
  • Multiple operation modes (M/S, Stereo, Mono)
  • Parallel compression
  • Oversampling and 64-bit processing
  • Scalable GUI
Read full description

Comp 609 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 Comp 609 AUv3 plug-in as many times as you want, thereby you get the Demo period again and again.) Unlimited version of Comp 609 AUv3 plug-in comes as In-App Purchase. FEATURES: • 6 Attack, 9 Recovery (Release) and 5 Ratio selections; • External Sidechain and Sidechain signal High-pass filter; • 6 operation modes: M/S, Mid-channel, Side-channel, Mono with Right-channel as Sidechain signal, 2-Mono, linked Stereo (or Mono); • Parallel compression; • 8x Oversampling and 64-bit floating point processing; • Undo/Redo; • A/B comparison; • 2x/4x/8x Upsampling; • Macro controllers; • Built-in Gain Match; • Scalable GUI. COMPRESSOR SECTION: • Threshold determines how much compression will occur. When the input signal exceeds the Threshold level, the compressor engages. A smaller value results in more compression. The available range is from -20 dBu to +12 dBu; • Attack determines how fast limiting will engage when the signal exceeds the limiter Threshold. The available values is from 1 to 6; • Recovery (Release) is the time it takes for the compressor to stop processing after the signal drops below the Threshold value. The available values are 40, 80, 100, 400, 600, 800, 1000, 1500, 2000 ms; • Ratio — this control determines the compressor ratio. The available values are 1.5:1, 2:1, 3:1, 4:1 and 6:1; • Sat. On — this toggle switch enables the Analog Saturation. The saturation has no effect unless this switch is in the «On» (down) position. MASTER SECTION: • SC-Filter — the Sidechain Filter controls the cutoff frequency of a low-cut filter on the compressor control signal Sidechain. The available range is 30 Hz to 240 Hz and Off; • Input Gain controls the signal input level to the plug-in; • The Makeup control increases the signal level out of the compressor to compensate for reduced levels as a result of compression. The available range is -20 dB to +20 dB. The Makeup control does not affect the amount of compression; • Mix — the output balance between the signal processed by the plug-in and the original dry source signal can be adjusted with the Mix control. Mix facilitates parallel compression techniques without having to create additional routings in the DAW; • Comp. In — this toggle switch enables the compressor. The compressor has no effect unless this switch is in the «In» (down) position. • Mode — compressor can operate in six modes: M/S, Mid-channel, Side-channel, Mono with Right-channel as Sidechain signal, 2-Mono, linked Stereo (or Mono). This switch determines the active mode. To use Comp 609 as a plug-in, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — Comp 609 will appear in the list of Audio Unit extensions for effect plug-ins in the host app.

About

Fair Limiter

This audio unit plugin emulates the classic Fairchild 670 tube compressor and limiter, offering its renowned sonic character. It provides comprehensive controls, including sidechain filters and boost, for detailed audio shaping. A free version is available for testing, with a one-time purchase to remove limitations.

Highlights
  • AUv3 plugin for DAWs
  • Fairchild 670 emulation
  • Sidechain filters and boost
  • Variable-Mu compression
  • Stereo or Mid/Side setup
  • 6386 tube simulation
Features
Read full description

Fair Limiter is an AUv3 audio unit plugin that digitally replicates the Fairchild 670, a legendary and highly esteemed tube compressor/limiter renowned for its outstanding audio quality and unique sonic character. Features: - Use as an AUv3 plugin in GarageBand, Logic Pro, AUM, or other DAW - Digital emulation of the Fairchild 670 - Features all the controls of the legacy Fairchild 670 - Adds additional control with the sidechain filters and boost - Variable-Mu compression - Fast attack, slow release times - 6386 tube simulation - Stereo or Mid/Side setup - Linking of stereo controls and sidechain output The free version allows you to test Fair Limiter completely, but every minute the limiter will be silent for 3 seconds. To remove these limits there is a one time in-app purchase.

Screenshots

Comp 6094 screens
Fair Limiter4 screens

Verdict

The call

The clearest difference is review sentiment: Comp 609 at 88% against Fair Limiter's 50%. Comp 609 also leads on rating (4.8 vs 4.4) and ratings volume (25 vs 8). Fair Limiter's advantage is update cadence (monthly vs every 7 months). On price, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Comp 609 sells 1 one-off in-app purchase and Fair Limiter sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Comp 609 holds the better App Store score, 4.8 against 4.4. Both are backed by a comparable volume of ratings — 25 and 8 respectively. Written reviews point the same way: 88% of Comp 609's written reviews are positive against 50% of Fair Limiter's.

UpkeepUpdate frequency

Comp 609 ships an update every 7 months, Fair Limiter monthly. The most recent releases landed on September 12, 2026 and August 31, 2026 respectively.

Scorecard5 real differences · 5 level
Comp 609 versus Fair Limiter: the parameters behind the verdict, then further details
ParameterComp 609Fair Limiter
PriceFreeFree
Rating4.8 (25 ratings) — better4.4 (8 ratings)
Positive reviews87.5% of reviews — better50.0% of reviews
Number of ratings25 — better8
Update frequencyEvery 7 monthsMonthly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS10.0 — better14.0
Further details — not scored
Size21 MB32 MB
Age rating4+4+
DeveloperRRS, OOOJan Maes

Customer experience

Comp 609

All ratings25 ratings
Positive96.0%
Neutral0.0%
Negative4.0%
Written reviews8 reviews
Positive87.5%
Neutral0.0%
Negative12.5%

Fair Limiter

All ratings8 ratings
Positive75.0%
Neutral12.5%
Negative12.5%
Written reviews4 reviews
Positive50.0%
Neutral25.0%
Negative25.0%

In-app purchases

1 purchases

Comp 609

One-time1
  • RRS Comp 609 Unlimited$4.99
1 purchases

Fair Limiter

One-time1
  • Fair Limiter Activation$11.99

Questions

Is Comp 609 free?
Comp 609 is free to download, with in-app purchases available.
Is Fair Limiter free?
Fair Limiter is free to download, with in-app purchases available.
Which has better reviews, Comp 609 or Fair Limiter?
Comp 609 is rated higher. Comp 609 averages 4.8 out of 5 from 25 ratings, while Fair Limiter averages 4.4 from 8 ratings.
Do Comp 609 or Fair Limiter have ads?
Neither Comp 609 nor Fair Limiter shows ads.
Which is updated more often, Comp 609 or Fair Limiter?
Comp 609 ships an update every 7 months, and Fair Limiter monthly. Most recently, Comp 609 was updated on September 12, 2026 and Fair Limiter on August 31, 2026.

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