Comparison

Zero Chorus vs RRS HLF

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

Head to head
About

Zero Chorus

This audio effect plugin provides a high-quality chorus inspired by the Roland Dimension D, offering a versatile sound without muddy low end. It integrates seamlessly with iOS DAWs and supports expanded controls for easy tweaking.

Highlights
  • Roland Dimension D style chorus
  • Feedback control for flanging
  • AUv3 audio unit extension
  • Expanded touch controls
  • Desktop quality algorithm
  • Thickens guitar and synth parts
Read full description

Looking for a rich chorus effect without a muddy low end? Zero Chorus is a high quality Roland Dimension D style chorus plug-in. The addition of a feedback control improves versatility by enabling flanging effects. Zero Chorus is an Audio Unit Extension (AUv3) that works inside host apps. Just open up your favorite host that supports Audio Units and add it as an effect. The controls expand when touched so they can be easily seen while tweaking. Zero Chorus brings a superb chorus algorithm to your favorite iOS DAW. Compatible with GarageBand, Cubasis, Auria, BeatMaker, AudioBus, AUM, Modstep, and more. Blamsoft brings their experience creating top notch plug-ins for the desktop to iOS. The same algorithm is found in the popular Zero Hybrid Synthesizer Rack Extension for Propellerhead Reason. The available parameters allow you to dial in a wide variety of chorus effects, from transparent to heavy. It's great for thickening electric guitar or synth parts. You get a desktop quality algorithm at an iOS friendly price. Tap Developer Website for sound examples. Note: Second screenshot shows the effect of touching a control.

About

RRS HLF

This audio plugin offers broad tonal sculpting with 12 dB per octave low and high cut filters. It allows for precise frequency subtraction to enhance musicality in mixes, compensating for hardware signal loss with unity gain.

Highlights
  • 12 dB/octave low and high cut filters
  • Retro-tonal sculpting
  • Special effects
  • Compensates for insertion loss
  • Unity gain upon insertion
  • Simple three-control interface
Read full description

The HLF-3C completes the Passive EQ Collection. This plug-in has 12 dB per octave low and high cut filters, providing broad retro-tonal sculpting or bygone-era special effects, without the inconvenience of insertion loss found with the unamplified passive hardware. You can easily subtract the unnecessary frequencies in any instrument and sub-group so they stay wonderfully musical in the mix. The original HLF-3C hardware unit is a true passive design: there are no input/output amplifiers and it does not require any external power. As a result, there is an inherent loss of signal level when using the HLF-3C hardware. The RRS HLF-3C plug-in compensates for this inherent signal loss for simplified use in the modern era: it has unity gain upon insertion (there is no insertion loss until one or both of the cut filters is engaged). The HLF-3C interface is very simple and includes only three controls: • Enable — This toggle switch is the plug-in bypass control. When in the down position (bypassed), plug-in processing is disabled altogether. The plug-in is engaged with the switch is in the up position. This switch can be used to compare the processed settings to that of the original signal; • Low Cut — This rotary switch specifies the cutoff frequency of the low cut filter. Ten frequencies are available: 50, 80, 100, 150, 250, 500, 750, 1000, 1500 and 2000 CPS; • High Cut — This rotary switch specifies the cutoff frequency of the high cut filter. Ten frequencies are available: 1.5, 2, 3, 4, 5, 6, 8, 10, 12 and 15 KCS. To use HLF-3C as a plug-in, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — HLF-3C will appear in the list of Audio Unit extensions for effect plug-ins in the host app.

Screenshots

Zero Chorus2 screens
RRS HLF4 screens

Verdict

The call

The clearest difference is review sentiment: RRS HLF at 100% against Zero Chorus's 43%. RRS HLF also leads on price (Free vs $2.99) and rating (5.0 vs 4.2). On ratings volume, 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

RRS HLF is free to download; Zero Chorus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

RRS HLF holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 21 and 19 respectively. Written reviews point the same way: 43% of Zero Chorus's written reviews are positive against 100% of RRS HLF's.

UpkeepUpdate frequency

Zero Chorus ships an update every 6 months, RRS HLF every 3 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level
Zero Chorus versus RRS HLF: the parameters behind the verdict, then further details
ParameterZero ChorusRRS HLF
Price$2.99Free — better
Rating4.2 (21 ratings)5.0 (19 ratings) — better
Positive reviews42.9% of reviews100.0% of reviews — better
Number of ratings21 — better19
Update frequencyEvery 6 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.09.0 — better
Further details — not scored
Size15 MB22 MB
Age rating4+4+
DeveloperBlamsoft, Inc.RRS, OOO

Customer experience

Zero Chorus

All ratings22 ratings
Positive77.3%
Neutral4.5%
Negative18.2%
Written reviews21 reviews
Positive42.9%
Neutral4.8%
Negative52.4%

RRS HLF

All ratings19 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Zero Chorus

No in-app purchases

None

RRS HLF

No in-app purchases

Questions

Is Zero Chorus free?
Zero Chorus costs $2.99, with no in-app purchases.
Is RRS HLF free?
RRS HLF is free to download, with no in-app purchases.
Which has better reviews, Zero Chorus or RRS HLF?
RRS HLF is rated higher. Zero Chorus averages 4.2 out of 5 from 21 ratings, while RRS HLF averages 5.0 from 19 ratings.
Do Zero Chorus or RRS HLF have ads?
Neither Zero Chorus nor RRS HLF shows ads.
Which is updated more often, Zero Chorus or RRS HLF?
Zero Chorus ships an update every 6 months, and RRS HLF every 3 months. Most recently, Zero Chorus was updated on November 6, 2026 and RRS HLF on November 3, 2026.

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