Zero Chorus vs RRS HLF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Roland Dimension D style chorus
- Feedback control for flanging
- AUv3 audio unit extension
- Expanded touch controls
- Desktop quality algorithm
- Thickens guitar and synth parts
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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.
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | Zero Chorus | RRS HLF |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.2 (21 ratings) | 5.0 (19 ratings) — better |
| Positive reviews | 42.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 21 — better | 19 |
| Update frequency | Every 6 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 15 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Blamsoft, Inc. | RRS, OOO |
Customer experience
Zero Chorus
RRS HLF
In-app purchases
Zero Chorus
No in-app purchases
RRS HLF
No in-app purchases









