CalmusPlay vs GtrLib Chords Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CalmusPlay
This app generates original, royalty-free music using artificial intelligence. Users can customize compositions by selecting elements like geographical origin, zodiac sign, interests, and desired speed. It's a simplified version of a desktop music composition program.
- AI music composition
- Royalty-free music
- Customizable music parameters
- Personalized music generation
- Simplified desktop version
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CalmusPlay - Your Personal Composer - composes music based on you... CalmusPlay composes original and royalty free music using Artificial Intelligence - Music for movies, TV shows or Games - and music for your self. The core of CalmusPlay is the CalmusAI brain where the modern composing methods are programmed into the brain using Lisp programming language. NASA has historically used Lisp for artificial intelligence and autonomous systems, most notably in the 1990s Remote Agent project, the first AI system to control a spacecraft. CalmusPlay does not collect or use any musical material from the internet but creates new music based on the input from the user. CalmusPlay can compose thousands of royalty free music examples by combining geographical position , zodiac sign, complexity, interests, colour and speed. How it works: Select your geographical origin, zodiac sign, personality complexity, interests, favourite colour, speed of your music and press Play … CalmusPlay is a simple versions of MacOs program CalmusComposer
GtrLib Chords Pro
Access a comprehensive library of guitar chords with detailed fingering and audio demonstrations. Quickly find any chord, explore inversions, and view positions across the fretboard. This tool is designed for guitarists of all levels.
- Vast chord library
- Suggested fingering
- Audio demonstrations
- Chord search
- All positions and inversions
- Apple Watch app
- Export as PNG/MIDI
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Explore the vast and comprehensive collection of guitar chords in GtrLib Chords Pro. Get all the possible positions of any chord throughout the fretboard along with its suggested fingering and audio demonstration. Use the built-in search to quickly get to any chord that you are looking for. GtrLib Chords is an invaluable tool in the pocket of any guitarist. • Vast and comprehensive chord library for guitar. • Includes suggested fingering for every chord. • Browse all the chords for every root note. • Explore all the inversions of a chord. • Change the root note with simple taps. • Search and quickly find any chord in any key. • Browse all the possible positions for every chord. • Search any chord directly using Spotlight. • Export any chord as a PNG image or MIDI file. • Includes a standalone app for Apple Watch. • VoiceOver support - makes the app accessible for users who are blind or have low vision. • Widgets - Quickly access recently viewed chords. • App Clips - Explore any chord in detail without having to install the complete app. • Includes support for Dark Mode. More on GtrLib Chords Pro for Apple Watch: GtrLib Chords Pro bundles a standalone app for Apple Watch and makes “most of the guitar chords you will ever need” accessible on the Apple Watch. You can quickly access any chord using just a few taps or using the context menu. Listen to any chord by just tapping on it.
Screenshots
Verdict
The clearest difference is review sentiment: GtrLib Chords Pro at 84% against CalmusPlay's 33%. GtrLib Chords Pro also leads on ratings volume (130 vs 2). CalmusPlay's advantage is price ($2.99 vs $8.99) and rating (5.0 vs 4.8). On update cadence, 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
CalmusPlay costs $2.99 and GtrLib Chords Pro $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.
CalmusPlay holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: GtrLib Chords Pro has 130 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 33% of CalmusPlay's written reviews are positive against 84% of GtrLib Chords Pro's, so the app with the better star average is not the one people write more warmly about.
CalmusPlay ships an update every 4 months, GtrLib Chords Pro every 2 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | CalmusPlay | GtrLib Chords Pro |
|---|---|---|
| Price | $2.99 — better | $8.99 |
| Rating | 5.0 (2 ratings) — better | 4.8 (130 ratings) |
| Positive reviews | 33.3% of reviews | 84.0% of reviews — better |
| Number of ratings | 2 | 130 — better |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch, Vision Pro — better |
| Requires iOS | 11.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 291 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Erki-tonlist sf | Bijoy Thangaraj |
Customer experience
CalmusPlay
GtrLib Chords Pro
In-app purchases
CalmusPlay
No in-app purchases
GtrLib Chords Pro
No in-app purchases
Questions
Is CalmusPlay free?
Is GtrLib Chords Pro free?
Which has better reviews, CalmusPlay or GtrLib Chords Pro?
Do CalmusPlay or GtrLib Chords Pro have ads?
Which is updated more often, CalmusPlay or GtrLib Chords Pro?
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