Comparison

CalmusPlay vs GtrLib Chords Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • AI music composition
  • Royalty-free music
  • Customizable music parameters
  • Personalized music generation
  • Simplified desktop version
Features
Read full description

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

About

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.

Highlights
  • Vast chord library
  • Suggested fingering
  • Audio demonstrations
  • Chord search
  • All positions and inversions
  • Apple Watch app
  • Export as PNG/MIDI
Features
Read full description

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

CalmusPlay4 screens
GtrLib Chords Pro4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
CalmusPlay versus GtrLib Chords Pro: the parameters behind the verdict, then further details
ParameterCalmusPlayGtrLib Chords Pro
Price$2.99 — better$8.99
Rating5.0 (2 ratings) — better4.8 (130 ratings)
Positive reviews33.3% of reviews84.0% of reviews — better
Number of ratings2130 — better
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch, Vision Pro — better
Requires iOS11.0 — better16.0
Further details — not scored
Size291 MB11 MB
Age rating4+4+
DeveloperErki-tonlist sfBijoy Thangaraj

Customer experience

CalmusPlay

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

GtrLib Chords Pro

All ratings128 ratings
Positive93.8%
Neutral2.3%
Negative3.9%
Written reviews25 reviews
Positive84.0%
Neutral4.0%
Negative12.0%

In-app purchases

None

CalmusPlay

No in-app purchases

None

GtrLib Chords Pro

No in-app purchases

Questions

Is CalmusPlay free?
CalmusPlay costs $2.99, with no in-app purchases.
Is GtrLib Chords Pro free?
GtrLib Chords Pro costs $8.99, with no in-app purchases.
Which has better reviews, CalmusPlay or GtrLib Chords Pro?
CalmusPlay is rated higher. CalmusPlay averages 5.0 out of 5 from 2 ratings, while GtrLib Chords Pro averages 4.8 from 130 ratings.
Do CalmusPlay or GtrLib Chords Pro have ads?
Neither CalmusPlay nor GtrLib Chords Pro shows ads.
Which is updated more often, CalmusPlay or GtrLib Chords Pro?
CalmusPlay ships an update every 4 months, and GtrLib Chords Pro every 2 months. Most recently, CalmusPlay was updated on November 1, 2026 and GtrLib Chords Pro on November 2, 2026.

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