EQ550 vs MPlus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
MPlus
This app offers advanced audio mixing capabilities with a customizable interface and extensive control over input and output channels. It features real-time spectrum analysis, a signal generator, and multi-track recording, all accessible via a touch screen or network connection.
- Customizable TFT LCD display
- Individual channel processing (gate, compressor, EQ, delay)
- Real-time spectrum analyzer (RTA)
- Signal generator (pink noise, sine wave, white noise)
- Multi-track USB recording
- Scene management with 100 storage slots
- Touchscreen and network control
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配置参数 •1.14寸通道TFT液晶引导显示,通道名字及背景颜色可自定义编辑(支持中文)。 •MIC输入增益调节(平滑的数字增益,参与保存到场景) •Mic输入通道(Linked)奇偶联调•・+48V幻象电源(MIC通道均可独立打开关闭,参与保存到场景) •每个输入通道都内置压限器,噪声门,相位,高低通滤波器,5段参量均衡,延时,通道声像平衡调节 •通道参数快速拷贝功能•・各通道均设有多功能菜单,哑音和监听 •通道100MM电动推杆(33个ALPS电动推子) •输入输出及效果通道独立物理推子控制 •各通道推子支持用户自定义层功能 •两个推子层翻页按键(输入翻页,输出及效果固定推子,操作更方便快捷) •8个可自定义的物理按键 •8个DCA编组,8个静音编组 •每个通道独立的反馈抑制器管理 •自带信号发生器(粉红噪音/正玄波/白噪声),可自定义从任何一个或者多个输出通道输出 •自带实时频谱RTA功能(颜色可编辑) •支持双机同步数据备份 •通道以及场景编辑支持中文输入法 •集成自动混音功能 •支持对讲话筒(Talkback)功能 •支持MIDI接口输入 •AUX输出(推子前/后)可设置 •输出通道处理:高低通滤波,15段参量均衡,主输出31段(GEQ支持通过在推子上操控),压缩器,延时,相位 •USB 8*8多轨录音功能 •内置声卡(手机、IPAD、MP3、PC直接播放、录音) •8个快捷场景调用模式,100个场景存储, 可自定义场景名字,支持中文输入,场景无缝切换,不会断音,支持U盘导入导出 •本地内置4个独立的DSP效果器,预设多种效果模式供用户直接使用 •FX脚踏开关接口 •12V输出接口,可外接照明设备 •可一键恢复出厂设置 •支持232中控控制 •多操作系统操控软件 • 支持有线网口调节(或外接路由器无线调节) •10.1寸1280*800高清电容触摸显示屏
Screenshots
Verdict
The clearest difference is rating: MPlus at 5.0 against EQ550's 4.5. MPlus also leads on in-app purchases (none vs 1). EQ550's advantage is update cadence (monthly vs every 13 months) and ratings volume (11 vs 1). On price, ads and device support 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. MPlus asks for nothing beyond the download.
MPlus holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: EQ550 has 11 ratings behind it against 1, so its average is the more settled of the two.
EQ550 ships an update monthly, MPlus every 13 months. The most recent releases landed on October 24, 2026 and September 28, 2026 respectively.
| Parameter | EQ550 | MPlus |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (11 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 11 — better | 1 |
| Update frequency | Monthly — 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 | 12.0 |
| Further details — not scored | ||
| Size | 20 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | RRS, OOO | 科 李 |
In-app purchases
EQ550
- RRS EQ550 Unlimited$4.99
MPlus
No in-app purchases









