EQ550 vs TuneTheory
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
Read full descriptionHide full description
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.
TuneTheory
Read full descriptionHide full description
The tuner and metronome built for musicians who care about precision and feel. TuneTheory hears your instrument ten milliseconds at a time and shows pitch to a fraction of a cent, with a live waveform that stands perfectly still the moment you land the note. Its metronome is sample-accurate: every click lands exactly where it should, at any tempo, no drift, no jitter. INSTRUMENT TUNER • 45 instruments: guitar, bass, ukulele, violin, viola, cello, banjo, mandolin, and many more • 217 playable tunings, from Standard and Drop D to open tunings and artist favorites, with new artist tunings added every month • Retune guide: pick a new tuning and see which way each string goes, one peg at a time • Not sure what you're in? Play your strings and TuneTheory names your tuning • Auto string detection, capo support, and a locked-in color the instant you're there CHROMATIC TUNER • Full chromatic detection with the nearest note, frequency, and cents • Strobe mode: a real-time waveform locked to the note, motionless when in tune • Reference pitch from A4 = 415 to 466 Hz for orchestral, baroque, and worship tuning METRONOME • Sample-accurate timing that never drifts • Grooves: Backbeat, Shuffle, Waltz, 6/8 Jig, Bossa Nova, One Drop, Train Beat, at the tempo you feel • Living grooves: Challenge drops beats out so you hold the time yourself, Evolve builds over sixteen bars, Surprise rewrites the pattern every four • Eight kits, from clean clicks to felt kicks and kalimba, plus Pulse, a synthesized kit that shifts with every accent • Grid editor: hold any step to rest it, accent it, or give it its own sound • 2/4, 3/4, 4/4, 5/4, 6/8, and 7/8, swing feel, tempo ramps, and presets • Sound, haptic, and visual feedback, with a room setting for a little air around each beat ONE UPGRADE, EVERYTHING UNLOCKED TuneTheory is free with generous basics. A single purchase unlocks every instrument and tuning, strobe mode, and the full metronome: every kit, every groove, living grooves, odd meters, swing, tempo ramps, and presets. No subscriptions. No ads. Pay once, own it forever. No tracking. No accounts. Nothing leaves your device.
Screenshots
Verdict
The clearest difference is update cadence: EQ550 at monthly against TuneTheory's every 6 months. EQ550 also leads on iOS requirement (10.0 vs 17.6). On price, ads, in-app purchases 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 and TuneTheory sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
EQ550 ships an update monthly, TuneTheory every 6 months. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.
| Parameter | EQ550 | TuneTheory |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (11 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 11 — better | — |
| Update frequency | Monthly — better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 20 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | RRS, OOO | Christopher Paul Cortez |
In-app purchases
EQ550
- RRS EQ550 Unlimited$4.99
TuneTheory
- TuneTheory Pro Metronome$4.99
- Pro Tuner$4.99
- Pro Studio$9.99









