FlexTune vs RRS Passive EQ Collection
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FlexTune
Personalize your car's audio system with this app. Easily adjust bass, clarity, and other sound settings using a five-band equalizer and create custom profiles for different music or moods. Enjoy wireless control of your KICKER audio system.
- Variable Five-Band Parametric Equalizer
- Multiple Custom Presets
- Remote KICKER Subwoofer Gain
- Adjustable Center-Image Control
- Bluetooth LE Enabled
- Wireless Control
Read full descriptionHide full description
Congratulations on your new vehicle. Now it’s time to make your sound personal! KICKER® FlexTune™ works seamlessly with your phone, tablet and your new KICKER audio system to personalize your sound. Increase the clarity? No problem. Want more KICKER bass? Turn one knob. Easily tweak the audio with a touch of the graphic five-band equalizer, right from your phone or tablet screen. You’ll hear how much better it sounds from the very first touch! When your sound is perfect, save it as your own personal profile, or make multiple profiles to match your tunes, your spouse’s tunes, the kids’ tunes – or your mood! Features: • Variable Five-Band Parametric Equalizer • Multiple Custom Presets • Remote KICKER Subwoofer Gain • Adjustable Center-Image Control • Bluetooth LE® Enabled • Completely Wireless Control
RRS Passive EQ Collection
This app offers a collection of vintage-inspired equalizers, combining three classic models into a single, full-featured audio plugin. It provides detailed control over tone shaping for music production and mixing. A demo version is available with limited playtime.
- Combines EQP-1A, MEQ-5, and HLF-3C equalizers
- Standalone and AUv3 plugin support
- Modeled vintage analog saturation
- Undo/Redo functionality
- A/B comparison
- Macro controllers
- Built-in Gain Match
Read full descriptionHide full description
The Passive EQ Collection 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 Passive EQ Collection AUv3 plug-in as many times as you want, thereby you get the Demo period again and again.) Unlimited version of Passive EQ Collection AUv3 plug-in comes as In-App Purchase. SPECIFICATIONS: • Three classics, EQP-1A, MEQ-5 and HLF-3C, combined in one full-featured equalizer; • Standalone and AUv3 Plug-in; • Modeled vintage Equalizers; • On/Off Analog Saturation; • Undo/Redo; • A/B; • 2x/4x/8x Upsampling; • Macro controllers; • Built-in Gain Match; • Scalable GUI. The EQP-1A based on Classic Program Equalizer from the '60s, original EQ is renowned for its unique ability to boost and cut the same frequencies simultaneously, thereby creating a resonant shelf, the EQP-1A faithfully models the overbuilt transformers and complex tube amplifiers of the original hardware. Conceived and created for broadband equalization, the EQP-1A features 4 low boost/cut frequencies, 3 high-cut frequencies and 7 HF boost points, along with a bandwidth control for shaping the high boost curve. The MEQ-5 based on Classic Mid-Range Equalizer from the '70s, with two bands of midrange boost and one band of midrange dip, the MEQ-5 gets the very best out of the «power region» where guitars and vocals can make or break a mix. The MEQ-5 provides exacting control of the «power region» in program material, that frequency range from about 300 Hz to 5000 Hz in which most of the sound energy is concentrated. The ear is especially sensitive to sounds in this region. In this region, even small resonances in studio acoustics and microphone and speaker responses are very evident in their effect on the listenability of the sound. Three independent sets of controls make it possible to boost on a peak curve at 200…1000 Hz while simultaneously boosting on a peak curve at 1.5…5 kHz, while simultaneously dipping at 200…7000 Hz. 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 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 broadband EQP-1A, the midrange MEQ-5 and the passive high/low filter HLF-3C together comprise a full range vintage EQ chain. To use Passive EQ Collection as a plug-in, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — Passive EQ Collection 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 Passive EQ Collection at 100% against FlexTune's 40%. RRS Passive EQ Collection also leads on rating (5.0 vs 2.8). FlexTune's advantage is in-app purchases (none vs 1) and iOS requirement (8.2 vs 10.0). On price, ratings volume, update cadence and ads 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
Both are free to download. RRS Passive EQ Collection sells 1 one-off in-app purchase. FlexTune asks for nothing beyond the download.
RRS Passive EQ Collection holds the better App Store score, 5.0 against 2.8. Both are backed by a comparable volume of ratings — 10 and 14 respectively. Written reviews point the same way: 40% of FlexTune's written reviews are positive against 100% of RRS Passive EQ Collection's.
FlexTune ships an update every 3 months, RRS Passive EQ Collection every 2 months. The most recent releases landed on August 14, 2026 and August 20, 2026 respectively.
| Parameter | FlexTune | RRS Passive EQ Collection |
|---|---|---|
| Price | Free | Free |
| Rating | 2.8 (10 ratings) | 5.0 (14 ratings) — better |
| Positive reviews | 40.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 10 | 14 — better |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.2 — better | 10.0 |
| Further details — not scored | ||
| Size | 16 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Kicker | RRS, OOO |
Customer experience
FlexTune
RRS Passive EQ Collection
In-app purchases
FlexTune
No in-app purchases
RRS Passive EQ Collection
- RRS Passive EQ Collection Full$8.99








