Comparison

Capo Key Transposer vs SUS4 Capo Calc

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

Head to head
About

Capo Key Transposer

Easily transpose songs to different keys by indicating the correct capo placement. Learn new chord shapes and manage your songbook offline. Ideal for singers, guitarists, and songwriters.

Highlights
  • Instant capo fret calculation
  • Open chord diagrams for common shapes
  • Support for 24 major and minor keys
  • Save and sort songs in a digital songbook
  • Offline functionality
  • Includes five starter songs
Features
Read full description

You know the song in G. The singer needs it in Bb. Capo tells you exactly where to clamp so the shapes you already know come out in the key you need. Most transposer apps hand you a new set of chords and leave you to relearn the song. Capo does the opposite: it keeps your fingers on the open shapes you already play and moves the capo instead. Spin two wheels, read the fret, play. WHAT YOU GET • Land on the right fret in seconds: pick the key you know and the key you need, and the capo fret (0–7) appears instantly • Play the song the easy way with open chord diagrams for the I, IV, V and vi shapes you will actually finger • Stop guessing what fits: all 24 major and minor keys with their full I–ii–iii–IV–V–vi chord families and relative keys • Walk on stage prepared: save every song with its key, capo fret and notes, then search and sort your saved songs by title, date or capo • Start playing tonight with five starter songs already in your songbook • Rehearse anywhere: everything works offline in the practice room, the church basement or the campfire PERFECT FOR • Singers and acoustic players who need a song in a different key before tonight • Worship and praise teams matching charts to each vocalist's range • Beginners who know four open chords and want to play many more songs • Songwriters and teachers testing which key sits best for a voice WHY NOT JUST LOOK IT UP? A chart on the wall shows one direction and none of your songs. Capo swaps the direction in a tap, shows the actual shapes to strum, and remembers the fret for every song in your set so you never re-solve the same problem twice. PRIVATE BY DEFAULT Your songbook stays on your device. No account, no sign-in, no ads and no tracking. Capo never needs an internet connection to do its job. FULL ACCESS Capo is a paid app. Choose a weekly or yearly subscription, or a one-time lifetime purchase, and unlock the transposer, the complete key reference, chord diagrams and unlimited saved songs. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period and can be managed in your App Store account settings. Set your original key, set your target key, and play your next song tonight. Terms of Service: https://pnkl26.web.app/terms-of-service Privacy Policy: https://pnkl26.web.app/privacy-policy Support: pnkhanhlinh0206@gmail.com

About

SUS4 Capo Calc

Features
Read full description

Pick the key you want to sing in and see which fret the capo goes on and which shapes to play. It also works the other way: type the chords and it finds the key. Fully on-device: no cloud, no account. Choose your tuning, choose the target key, and Capo Calc lists the options with the fret and the shapes, with open-friendly shapes first if you want them. Change the tuning to drop D, DADGAD or open G and the answer changes with it. • Capo position and chord shapes for any target key • Find Key: type a progression and get its key • Standard, dropped, open and modal tunings, and 7 and 8-string guitars • Fretboard diagrams for each suggestion For singers moving songs into their range, worship guitarists following a key sheet, and guitarists playing with a second guitar. Everyone gets two calculations 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

Capo Key Transposer4 screens
SUS4 Capo Calc4 screens

Verdict

The call

The clearest difference is update cadence: SUS4 Capo Calc at every 2 weeks against Capo Key Transposer's every 2 months. SUS4 Capo Calc also leads on device support (4 vs 1). On price, ads, in-app purchases and iOS requirement 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. Capo Key Transposer sells 3 in-app purchases, starting at $2.99 per 7 days and SUS4 Capo Calc sells 10 in-app purchases, starting at $4.39 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Capo Key Transposer ships an update every 2 months, SUS4 Capo Calc every 2 weeks. The most recent releases landed on October 31, 2026 and November 10, 2026 respectively.

Scorecard2 real differences · 8 level
Capo Key Transposer versus SUS4 Capo Calc: the parameters behind the verdict, then further details
ParameterCapo Key TransposerSUS4 Capo Calc
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPad, Mac, Apple Watch — better
Requires iOS17.016.0 — better
Further details — not scored
Size4 MB29 MB
Age rating4+4+
DeveloperLinh Phan Nhat KhanhThePaulSmith

In-app purchases

3 purchases

Capo Key Transposer

Subscriptions2
  • Capo Key Transposer Weekly$2.997 Days
  • Capo Key Transposer Yearly$14.991 Year
One-time1
  • Major Minor Scales Lifetime$29.99
10 purchases

SUS4 Capo Calc

Subscriptions7
  • SUS4 All-Access7 Days trial$4.391 Month
  • SUS4 All-Access7 Days trial$5.991 Month
  • SUS4 All-Access7 Days trial$7.991 Month
Show 4 more
  • 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-time3
  • SUS4 Capo Calc Lifetime$54.99
  • SUS4 Capo Calc Lifetime$71.99
  • SUS4 Capo Calc Lifetime$103.99

Questions

Is Capo Key Transposer free?
Capo Key Transposer is free to download, with in-app purchases available.
Is SUS4 Capo Calc free?
SUS4 Capo Calc is free to download, with in-app purchases available.
Do Capo Key Transposer or SUS4 Capo Calc have ads?
Neither Capo Key Transposer nor SUS4 Capo Calc shows ads.
Which is updated more often, Capo Key Transposer or SUS4 Capo Calc?
Capo Key Transposer ships an update every 2 months, and SUS4 Capo Calc every 2 weeks. Most recently, Capo Key Transposer was updated on October 31, 2026 and SUS4 Capo Calc on November 10, 2026.

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