Comparison

Reverse Chord Finder Pro vs SUS4 Chord ID

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

Head to head
About

Reverse Chord Finder Pro

Identify chords by inputting notes from various instruments or music notation. Discover chord names, hear them played, and analyze their construction. Supports multiple instruments and customization options for musicians of all levels.

Highlights
  • Input notes via piano, string instruments, or music score
  • Extensive chord database with over 100 chord types
  • Hear chords as block chords or arpeggios
  • Find partial chord matches
  • Save identified chords to Favorites
  • View chords on different instruments or notation
  • Left-handed string instrument support
Features
Read full description

If you’ve ever asked “What chord am I playing?” Reverse Chord Finder Pro is for you! Just select two or more notes — using piano, stringed instruments, or music notation — and the app will show you the names of the chords that match. “This app is simply awesome! It will accelerate your discovery of new chords in leaps and bounds and raise your level of playing to new heights.” — A Happy Customer KEY FEATURES * Enter notes in 3 different modes: Piano/Keyboard, String Instruments (guitar, bass, ukulele, etc.), and Music Score * Extensive chord database — more than 100 chord types! * Hear chords played as block chords or arpeggios * Find partial chord matches to isolate passing melody notes * Use the Favorites list to bookmark chords you’ve identified * See the same chord represented on different instruments or in musical notation SPECIAL FEATURES * Left-handed String Instrument support * String Instrument options for 3 to 12 strings, plus capo * Music Score mode supports treble and bass staff, and all 12 major and minor keys * View major scale degrees for selected notes to learn chord construction * Customize chord notation (CDEFGAB, CDEFGAH, Do-Re-Mi) MUSICIANS, COMPOSERS, AND MUSIC STUDENTS * Analyze and write down harmonies * Recognize and construct chords more easily * Improve your understanding of chord theory MUSIC TO OUR EARS “I can look up chords faster than with any other method. Worth much more than the current price.” “With this app I can find out what the chords are ... No more embarrassment in front of the rest of the band!” “A songwriter’s best friend!” Questions or comments? Need some help? Email: support@reversechord.com Web: http://reversechord.com Terms of use: http://reversechord.com/terms.html

About

SUS4 Chord ID

Identify chords by playing them into your device's microphone or by tapping notes on a virtual keyboard. It recognizes ten chord types and offers guitar fingerings. Save your progressions with notes for future reference.

Highlights
  • Microphone chord detection
  • Virtual keyboard input
  • Ten chord types recognized
  • Guitar fingerings
  • Saved chord history with notes
  • On-device processing
Features
Read full description

Play a chord into the mic and see its name, with the top three matches and how sure it is. Or tap the notes on the built-in keyboard. Fully on-device: no cloud, no account. Chord ID knows ten chord types: major, minor, dominant 7th, major 7th, minor 7th, diminished, augmented, sus2, sus4 and power chords. Save the chords you want to keep, add a note, and you have a record of the progression you were working on. • Mic detection with the top three candidates and a confidence for each • A keyboard for tapping notes in • Ten chord types, from triads to 7ths and sus chords • Guitar fingerings for common open chords • A saved history with notes For guitarists working out a song, pianists checking a voicing, and theory students. Everyone gets a few identifications a day. Pro, or SUS4 All-Access across the whole range, removes the daily limit. Made in the UK by working musicians. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Reverse Chord Finder Pro4 screens
SUS4 Chord ID4 screens

Verdict

The call

The clearest difference is rating: Reverse Chord Finder Pro at 4.7 against SUS4 Chord ID's 1.0. Reverse Chord Finder Pro also leads on ratings volume (704 vs 1). SUS4 Chord ID's advantage is update cadence (fortnightly vs every 5 weeks) and device support (4 vs 2). On price, 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

Both are free to download. Reverse Chord Finder Pro sells 6 in-app purchases, starting at $0.99 per 7 days and SUS4 Chord ID sells 10 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Reverse Chord Finder Pro holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Reverse Chord Finder Pro has 704 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Reverse Chord Finder Pro ships an update every 5 weeks, SUS4 Chord ID fortnightly. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

Scorecard4 real differences · 6 level
Reverse Chord Finder Pro versus SUS4 Chord ID: the parameters behind the verdict, then further details
ParameterReverse Chord Finder ProSUS4 Chord ID
PriceFreeFree
Rating4.7 (704 ratings) — better1.0 (1 ratings)
Positive reviews83.6% of reviews—
Number of ratings704 — better1
Update frequencyEvery 5 weeksFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPodiPhone, iPad, Mac, Apple Watch — better
Requires iOS15.6 — better16.0
Further details — not scored
Size36 MB30 MB
Age rating4+4+
DeveloperGhostdustThePaulSmith

Customer experience

Reverse Chord Finder Pro

All ratings689 ratings
Positive93.9%
Neutral1.5%
Negative4.6%
Written reviews140 reviews
Positive83.6%
Neutral2.9%
Negative13.6%

SUS4 Chord ID

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Reverse Chord Finder Pro

Reported bugs

2 issues
  • Capo feature not working as expected
  • Sound not playing in some cases

Requested features

5 requests
  • Ability to save chord progressions
  • Chord lookup functionality
  • MIDI support
  • Customizable chord display options
  • Export chord data to PDF

SUS4 Chord ID

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

Reverse Chord Finder Pro

Subscriptions5
  • Weekly (Personal)7 Days trial$0.997 Days
  • Monthly (Personal)$1.991 Month
  • Monthly (Family)$2.991 Month
Show 2 more
  • Annual (Personal)$17.991 Year
  • Annual (Family)$24.991 Year
One-time1
  • Lifetime (Family)$34.99
10 purchases

SUS4 Chord ID

Subscriptions8
  • SUS4 Chord ID Pro Monthly7 Days trial$2.991 Month
  • SUS4 All-Access7 Days trial$4.391 Month
  • SUS4 All-Access7 Days trial$5.991 Month
Show 5 more
  • SUS4 All-Access7 Days trial$7.991 Month
  • SUS4 All-Access Annual7 Days trial$19.991 Year
  • SUS4 All-Access Annual7 Days trial$26.991 Year
  • SUS4 All-Access Annual7 Days trial$35.991 Year
  • SUS4 All-Access Annual7 Days trial$51.991 Year
One-time2
  • SUS4 Chord ID Lifetime$54.99
  • SUS4 Chord ID Lifetime$103.99

Questions

Is Reverse Chord Finder Pro free?
Reverse Chord Finder Pro is free to download, with in-app purchases available.
Is SUS4 Chord ID free?
SUS4 Chord ID is free to download, with in-app purchases available.
Which has better reviews, Reverse Chord Finder Pro or SUS4 Chord ID?
Reverse Chord Finder Pro is rated higher. Reverse Chord Finder Pro averages 4.7 out of 5 from 704 ratings, while SUS4 Chord ID averages 1.0 from 1 ratings.
Do Reverse Chord Finder Pro or SUS4 Chord ID have ads?
Neither Reverse Chord Finder Pro nor SUS4 Chord ID shows ads.
Which is updated more often, Reverse Chord Finder Pro or SUS4 Chord ID?
Reverse Chord Finder Pro ships an update every 5 weeks, and SUS4 Chord ID fortnightly. Most recently, Reverse Chord Finder Pro was updated on November 1, 2026 and SUS4 Chord ID on October 31, 2026.

Other comparisons