Music Theory Intervals vs Equalizer Pro +
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Music Theory Intervals
This app helps musicians of all levels identify musical intervals by ear or sight. It offers various training modes, clef support, and customizable settings for practice. Results can be saved and printed for progress tracking.
- Interval recognition by sight and sound
- Simple and compound interval training
- Audio, Visual, and combined modes
- Treble, Alto, Tenor, Bass clef support
- Customizable interval playback
- Printable Grade Book for results
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Teachers, students and professional musicians: Recognize simple and compound intervals by sight and/or sound. Includes a 'Grade Book' list of all saved results that you can print or send. • Simple Intervals included are major, minor, diminished, augmented 2nds, 3rds, 6ths, 7ths, and diminished, perfect, and augmented 4ths, 5ths, and octaves. • Compound Intervals are intervals larger than an octave. • Three modes: Audio and Visual, Audio Only (Ear Training), and Visual Only (Clef Notation Training). • Treble, Alto, Tenor, and Bass clefs. • Set how the interval is played; harmonically, melodically up, down, or randomly. • Set a random root change, or set the root yourself between each question. • Set the number of questions, or stop anytime and grade only the number answered. The Grade Book is filterable by name. Grades include the name, date and time the quiz was taken, all relevant settings (clef, number of questions, etc.), and score (percentage and letter grade).
Equalizer Pro +
Enhance your audio experience with a professional equalizer and a full-featured music player. Enjoy high-quality sound, customizable EQ curves, and support for various audio formats. Manage your music library with ease, including playlist creation and song transfer options.
- High-performance equalizer with 32-bit float processing
- Customizable EQ curves with unlimited points
- Plays MP3, FLAC, OGG, WAV, APE files
- Supports iPod Library playback
- Multiple playlists and playback controls
- Song transfer via iTunes File Sharing and WiFi
- CarPlay and Dark Appearance support
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Professional Equalizer + Full featured MP3/OGG/FLAC Player HIGH PERFORMANCE EQUALIZER - Highly optimized equalizing algorithm. Uses much less battery than other EQ apps with comparable algorithm. - High quality equalization without distortion. Uses 32-bit float processing. - Draw EQ curves without limitation of number of points. - Realtime spectrum output FULL FEATURED PLAYER - Play directly from iPod Library. - MP3/FLAC/OGG/WAV/APE file support - lock screen album art & meta-data support - mulitasking - remote control support - Customizable gestures - Multiple playlists - scrubbing, repeat, shuffle - Support ID3 lyrics (LRC and SYLT word-level lyrics), album art. - Transfer songs between PC/MAC using iTunes files sharing - Transfer songs using WiFi - supports CarPlay - supports Dark Appearance EQ PRESETS - 12 built-in EQ Presets - Unlimited user EQ Presets. - You can set EQ preset for individual track. (EQ preset for song is automatically loaded when played) * DRM protected tracks are not supported.
Screenshots
Verdict
The clearest difference is rating: Music Theory Intervals at 4.7 against Equalizer Pro +'s 4.2. Music Theory Intervals also leads on price ($1.99 vs $4.99). Equalizer Pro +'s advantage is update cadence (fortnightly vs every 28 months) and ratings volume (557 vs 3). On ads, in-app purchases and monetization model 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
Music Theory Intervals costs $1.99 and Equalizer Pro + $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Music Theory Intervals holds the better App Store score, 4.7 against 4.2. That said, the two scores are not equally well evidenced: Equalizer Pro + has 557 ratings behind it against 3, so its average is the more settled of the two.
Music Theory Intervals ships an update every 28 months, Equalizer Pro + fortnightly. The most recent releases landed on September 26, 2026 and October 13, 2026 respectively.
| Parameter | Music Theory Intervals | Equalizer Pro + |
|---|---|---|
| Price | $1.99 — better | $4.99 |
| Rating | 4.7 (3 ratings) — better | 4.2 (557 ratings) |
| Positive reviews | — | 46.8% of reviews |
| Number of ratings | 3 | 557 — better |
| Update frequency | Every 28 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 43 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | Patrick Q. Kelly | Tachyon Factory Inc. |
Customer experience
Music Theory Intervals
Equalizer Pro +
Bugs and requests
Music Theory Intervals
Not enough reviews yet to summarise bugs or requests.
Equalizer Pro +
Reported bugs
5 issues- Inability to play songs from iTunes library
- Issues with CarPlay integration
- Inconsistent behavior with iOS updates
- Syncing problems with playlists and album art
- Frequent crashes and freezes
Requested features
6 requests- Expand support for streaming services
- Improve playlist management
- Add more preset EQ options
- Enhance visualizer and UI customization
- Optimize performance for older devices
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- Provide better guidance and tutorials
In-app purchases
Music Theory Intervals
No in-app purchases
Equalizer Pro +
No in-app purchases
Questions
Is Music Theory Intervals free?
Is Equalizer Pro + free?
Which has better reviews, Music Theory Intervals or Equalizer Pro +?
Do Music Theory Intervals or Equalizer Pro + have ads?
Which is updated more often, Music Theory Intervals or Equalizer Pro +?
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