Chord vs Unit Circle Calculator PRO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Chord
Unlock musical creativity with a suite of tools for composing and practicing. Generate chord progressions, practice notation, train your ear, and even use your device as a MIDI keyboard. Includes a macOS version for seamless integration.
- Chord progression generation with inversions and extensions
- Live playback as piano or synth
- MIDI output to macOS
- Guitar chord finder
- Notation reading practice
- Ear training for intervals and voice
- macOS version included
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This app plus your ears equals complete freedom in writing music! A comprehensive set of tools for any musician: * Chord Progression: Create beautiful chord progressions with full flexibility - use inversions, sus2, sus4, 7th, 9th, and more. Enjoy live playback as piano or synth, or send MIDI directly to your macOS computer! * Guitar Chords - helps you find and browse guitar chords. * MIDI Keyboard: Transform your phone into a MIDI keyboard for your macOS computer (compatible with macOS Catalina and newer). * Notation Practice: Practice reading notes in both treble and bass clefs. * Chord Calculation: Help you learn how to calculate chords and progressions. * Interval Practice: Practice recognizing and comparing musical intervals by ear. * Voice & Ear Training: Simple, effective tools for voice practice and ear training. * Harmonic Match - helps you mix tracks in key while DJing. * Guitar tuner - helps you tune your guitar to the most popular tunings. * Modulation Pad - Helps when using a compact MIDI keyboard without built-in pitch and modulation controls. Also includes a sustain pedal (compatible with macOS Catalina and newer). Plus, enjoy the macOS version included with your purchase!
Unit Circle Calculator PRO
Visualize and understand the unit circle with step-by-step calculations, diagrams, and animations. Supports various input formats including negative values, decimals, fractions, and pi. Save, share, and revisit past calculations.
- Unit circle visualization
- Step-by-step calculation
- Diagrams and animations
- Supports negative values, decimals, fractions, and π
- Calculation history
- Shareable solutions
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The unit circle is visualized and explained with calculation steps, diagrams and animations. Enter the radian or the angle α to calculate the results. Negative values, decimals, fractions and π are supported. The solution is displayed step by step. All calculations are saved in the history. The solution can be shared. [ Contents] - all important quantities for the unit circle - results are also calculated as π-value - animation to show the angle α - diagrams for sine and cosine - history function to save the input - detailed solution - negative values, decimal numbers, fractions and π are supported - no ads! [ Usage ] - there are fields for entering values using a special keyboard - press the check mark button at the bottom right to start the calculation - if values are missing, all fields will be marked orange - if the values are wrong, the affected field will be highlighted red - the entries in the history can be deleted or sorted - if you select an entry in the history, it will be automatically loaded for the calculation - the whole history can be deleted by pressing a button - solutions can be shared
Screenshots
Verdict
Chord and Unit Circle Calculator PRO both sit at 4.8 stars, but that hides the real split: 100% of Unit Circle Calculator PRO's written reviews are positive against 57% of Chord's. Unit Circle Calculator PRO also leads on price ($1.99 vs $3.99). Chord's advantage is device support (5 vs 3) and ratings volume (81 vs 25). On rating, update cadence, ads and in-app purchases 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
Chord costs $3.99 and Unit Circle Calculator PRO $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.8 for Chord against 4.7 for Unit Circle Calculator PRO. Both are backed by a comparable volume of ratings — 81 and 25 respectively. Written reviews are what separate them: 57% of Chord's written reviews are positive against 100% of Unit Circle Calculator PRO's.
Chord ships an update every 4 weeks, Unit Circle Calculator PRO monthly. Both last shipped on October 24, 2026.
| Parameter | Chord | Unit Circle Calculator PRO |
|---|---|---|
| Price | $3.99 | $1.99 — better |
| Rating | 4.8 (81 ratings) — better | 4.7 (25 ratings) |
| Positive reviews | 57.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 81 — better | 25 |
| Update frequency | Every 4 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 46 MB | 181 MB |
| Age rating | 4+ | 4+ |
| Developer | Roman Sevastyanov | Glindemann, Sennoun, Langer GbR |
Customer experience
Chord
Unit Circle Calculator PRO
In-app purchases
Chord
No in-app purchases
Unit Circle Calculator PRO
No in-app purchases
Questions
Is Chord free?
Is Unit Circle Calculator PRO free?
Which has better reviews, Chord or Unit Circle Calculator PRO?
Do Chord or Unit Circle Calculator PRO have ads?
Which is updated more often, Chord or Unit Circle Calculator PRO?
Other comparisons
