dspMixFx vs EQ550
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
dspMixFx
This app provides latency-free monitoring and control of DSP features for compatible Yamaha audio interfaces on iOS devices. It enables access to effects like REV-X reverb and Guitar Amp Classics, enhancing your audio production workflow.
- Control DSP mixer and effects
- Latency-free monitoring
- REV-X reverb
- Sweet Spot Morphing Channel Strip
- Guitar Amp Classics
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Together with the UR-RT2, UR-RT4, UR242, UR44, UR28M and UR824 audio interfaces, the dspMixFx app allows you to utilize the benefits of Yamaha’s custom-designed SSP2 DSP chip directly on your iPad and iPhone. The dspMixFx app is free of charge, providing latency-free monitoring while running the highly acclaimed REV-X reverb, the Sweet Spot Morphing Channel Strip and Guitar Amp Classics with other iOS audio apps. Please note that this app is only a control application for Steinberg’s USB audio interfaces UR-RT2, UR-RT4, UR242, UR44, UR28M and UR824. Without a UR interface it can be used in demo mode only. Find more information about the UR audio interfaces at: http://www.steinberg.net/en/products/audio_interfaces/ur_series Find more information about the UR-RT audio interfaces at: http://www.steinberg.net/en/products/audio_interfaces/ur-rt_series Make sure to download and install the firmware update version 2.10 first for UR44, UR28M and UR824 to enable the UR interface to run together with the dspMixFx app. You can find the firmware update at: http://www.steinberg.net/en/support/downloads Key features • Control of all DSP features like DSP mixer and DSP effects • No-latency DSP-powered monitoring with the iPad and iPhone • Works with UR-RT2, UR-RT4, UR242, UR44, UR28M and UR824* * Units need to be switched to class compliant mode to run with the iPad via the iPad Camera Connection Kit, the Lightning to USB Camera Adapter or the Lightning to USB 3 Camera Adapter. In CC mode Loopback capability is disabled and only the analog inputs and outputs are available on UR28M and UR824.
EQ550
This audio effect plugin emulates classic American EQs from the late 1960s, offering precise control over equalization with unique Proportional Q technology. It functions as a standalone app or an AUv3 plugin for compatible hosts, providing a flexible and characterful sound shaping experience.
- Standalone and AUv3 plugin
- 3 bands of classic American equalization
- Proportional Q filter bandwidth
- Stereo, Mid, or Side EQ modes
- Undo/Redo and A/B comparison
- Scalable GUI
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EQ550 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 EQ550 AUv3 plug-in as many times as you want, thereby you get the Demo period again and again.) Unlimited version of EQ550 AUv3 plug-in comes as In-App Purchase. The EQ550 faithfully captures the punch, low-frequency transparency, and ultra-tight imaging of iconic American EQs of the late 1960’s. 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. Features: • Standalone and AUv3 plug-in; • 3 bands of classic American equalization; • Each band offers 7 selected frequency centers; • Maximum 15dB of boost/cut per band; • EQ Band 1 and 3 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. The EQ550 provides reciprocal equalization at 21 points in 5 steps of boost to a maximum of 15dB of gain at each point. The twenty one equalization points are divided into three overlapping ranges. The high and low frequency ranges are individually selectable as either peaking or shelving, and a band-pass filter may be inserted independently of all other selected equalization settings. Frequency ranges and boost/cut are selected by switches, and a pushbutton «IN» switch allows the EQ to be silently introduced to the signal path. A small toggle switch is used to insert the band-pass filter into the EQ550. The EQ550 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 EQ550 as a plug-in, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — EQ550 will appear in the list of Audio Unit extensions for effect plug-ins in the host app.
Screenshots
Verdict
The clearest difference is rating: EQ550 at 4.5 against dspMixFx's 3.7. EQ550 also leads on update cadence (monthly vs every 11 months). dspMixFx's advantage is in-app purchases (none vs 1). On price, review sentiment, 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. EQ550 sells 1 one-off in-app purchase. dspMixFx asks for nothing beyond the download.
EQ550 holds the better App Store score, 4.5 against 3.7. Both are backed by a comparable volume of ratings — 9 and 11 respectively. Written reviews point the same way: 29% of dspMixFx's written reviews are positive against 33% of EQ550's.
dspMixFx ships an update every 11 months, EQ550 monthly. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.
| Parameter | dspMixFx | EQ550 |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (9 ratings) | 4.5 (11 ratings) — better |
| Positive reviews | 29.2% of reviews | 33.3% of reviews — better |
| Number of ratings | 9 | 11 — better |
| Update frequency | Every 11 months | Monthly — 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 | 9.0 — better | 10.0 |
| Further details — not scored | ||
| Size | 53 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Steinberg Media Technologies GmbH | RRS, OOO |
Customer experience
dspMixFx
EQ550
In-app purchases
dspMixFx
No in-app purchases
EQ550
- RRS EQ550 Unlimited$4.99








