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.
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.
- 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
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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
SUS4 Capo Calc
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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
Verdict
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
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.
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.
| Parameter | Capo Key Transposer | SUS4 Capo Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone, iPad, Mac, Apple Watch — better |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Linh Phan Nhat Khanh | ThePaulSmith |
In-app purchases
Capo Key Transposer
- Capo Key Transposer Weekly$2.997 Days
- Capo Key Transposer Yearly$14.991 Year
- Major Minor Scales Lifetime$29.99
SUS4 Capo Calc
- SUS4 All-Access7 Days trial$4.391 Month
- SUS4 All-Access7 Days trial$5.991 Month
- SUS4 All-Access7 Days trial$7.991 Month
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- 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
- SUS4 Capo Calc Lifetime$54.99
- SUS4 Capo Calc Lifetime$71.99
- SUS4 Capo Calc Lifetime$103.99
Questions
Is Capo Key Transposer free?
Is SUS4 Capo Calc free?
Do Capo Key Transposer or SUS4 Capo Calc have ads?
Which is updated more often, Capo Key Transposer or SUS4 Capo Calc?
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