EQ550b vs Zen AutoPan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
EQ550b
This audio effect plugin emulates a classic American equalizer from the late 1960s, offering four bands of equalization with selectable frequencies and proportional Q. It provides a wide range of tonal variations for professional audio manipulation and can be used as a standalone app or an AUv3 plugin.
- Modeled vintage EQ
- Four bands of equalization
- Selectable frequency centers
- Proportional Q filter
- Stereo, Mid, or Side EQ modes
- AUv3 plugin compatibility
Read full descriptionHide full description
EQ550b 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 EQ550b AUv3 plug-in as many times as you want, thereby you get the Demo period again and again.) Unlimited version of EQ550b AUv3 plug-in comes as In-App Purchase. Based on Classic American EQ from the late '60s, the EQ550b is a continuation of the EQ that played a major role in the history of music recording, but with an additional filter band and several new frequencies. With a surprisingly wide range of tonal variations, the EQ550b is an invaluable and professional audio tool with great flexibility and excellent sonic ability. Features: • Standalone and AUv3 plug-in; • Precise port of Rack Extensions plug-in; • Modeled vintage EQ; • Four bands of classic American equalization; • Each band offers seven selected frequency centers; • 15 dB of boost/cut per band; • EQ band 1 and 4 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. Rather than offer a huge assortment of complex features, the EQ550b provides exactly the right number of controls. Its four EQ bands are overlapped significantly to aid in dual roles as problem solver and sweetening device with each band offering seven switchable filter frequencies that span four-to-five octaves. These frequencies, purposely selected to be musical rather than numeric. 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. The EQ550b 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 EQ550b as a plug-in, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — EQ550b will appear in the list of Audio Unit extensions for effect plug-ins in the host app.
Zen AutoPan
This AUv3 stereo movement tool offers dynamic panning effects for music production and sound design. Sculpt your audio with multiple LFO shapes and an intuitive XY pad for real-time creative control. Seamlessly integrate with compatible DAWs on iOS devices.
- Multiple LFO Shapes
- Intuitive XY Pad
- Adjustable Stereo Width
- AUv3 Compatibility
- Optimized for iOS
- 3D Visuals
Read full descriptionHide full description
FX Forms #002 - Zen AutoPan from Wild Surmise Music, second offering in the series of AUv3 FX plugins. Note: This needs a compatible DAW App such as Logic Pro, AUM, Cubasis, Garageband etc to use the AUv3 plugin. Zen AutoPan is not merely a tool, but an invitation to dance with the rhythm of the universe. Designed with the meticulous care of a Zen garden, this AUv3 app is a portal to experiencing the dynamic interplay of sound and silence. As Alan Watts might say, it allows you to "play" with your music, weaving the fabric of stereo panning effects into the tapestry of auditory experience. In the act of creating or enhancing sound, Zen AutoPan becomes a partner in the dance of existence, moving with the effortless grace of a leaf on a breeze. It's here, in the realm of music production and sound design, that Zen AutoPan offers a reflection of the universe's own symphony, inviting you to partake in the cosmic play of sound and silence, movement and stillness. Features: - Multiple LFO Shapes: Choose from sine, square, sawtooth, and random LFO shapes to sculpt your sound. - Intuitive XY Pad: Control the depth and speed of your stereo panning effects with an easy-to-use XY pad, allowing for real-time adjustments and creative expression. - Width Control: Adjust the stereo width to go from subtle spatial enhancements to full stereo sweeps, giving your tracks a larger-than-life presence. - Versatile Use: Ideal for music production, live performances, and sound design projects. - AUv3 Compatibility: Seamlessly integrates with your favorite DAW or music production app, offering flexibility and ease of use. - Optimized for iOS: Crafted specifically for the iOS environment, Zen AutoPan ensures a stable, high-performance experience on your favorite devices. 3D Visuals leverage SceneKit and Metal Shaders providing good visual performance on iOS devices and can also be turned off in the info menu.
Screenshots
Verdict
The clearest difference is in-app purchases: Zen AutoPan at none against EQ550b's 1. EQ550b's advantage is update cadence (every 2 weeks vs every 13 months) and review sentiment (100% vs 80%). On price, rating, ratings volume 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. EQ550b sells 1 one-off in-app purchase. Zen AutoPan asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.8 for EQ550b against 4.7 for Zen AutoPan. Both are backed by a comparable volume of ratings — 14 and 15 respectively. Written reviews are what separate them: 100% of EQ550b's written reviews are positive against 80% of Zen AutoPan's.
EQ550b ships an update every 2 weeks, Zen AutoPan every 13 months. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.
| Parameter | EQ550b | Zen AutoPan |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (14 ratings) — better | 4.7 (15 ratings) |
| Positive reviews | 100.0% of reviews — better | 80.0% of reviews |
| Number of ratings | 14 | 15 — better |
| Update frequency | Every 2 weeks — better | Every 13 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 19 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | RRS, OOO | Tom Power |
Customer experience
EQ550b
Zen AutoPan
In-app purchases
EQ550b
- RRS EQ550b Unlimited$4.99
Zen AutoPan
No in-app purchases









