We are going to lose this comparison on most axes, so here they are first. All of this is from their pricing page, checked in September 2026.
SongbookPro’s own feature list says it transposes text-based songs. That is the sentence this whole page turns on, and it is not a criticism — it is true of almost every app in this category.
A photograph of a page in your band book is not text. Neither is a scanned PDF, or a screenshot, or a hook you sang into your phone at 11pm. In most apps those arrive as pictures of songs: you can see them, file them and set-list them, but you cannot change the key, because there is nothing there to change.
SongCharter turns them into facts. Every chord ends up anchored to a word, which means the photograph transposes exactly like a typed chart does — and the capo ladder can score every position against the song’s actual chords.
SongbookPro states plainly that iOS, Android and Windows are each sold separately. If you read charts on an iPad and prepare them on a Windows PC, that is two purchases.
SongCharter is $19.99 once across every Apple device you own, through Universal Purchase — but only Apple devices. Which of those is better arithmetic depends entirely on what your band carries, and for a lot of bands it is theirs.
SongbookPro Solo syncs your own devices through your own cloud storage; sharing a library with a band is what Groups is for, a subscription from $4 per user per year — $30/yr for six, $50/yr for twelve.
In SongCharter a set travels as a link. Your bandmate taps it and the whole set opens in their browser — no account, no app, nothing installed, and nothing of yours on our servers, because the set rides in the part of the URL browsers never send anywhere. It is a smaller feature than a managed shared library with permissions. It is also free and works on a bandmate’s Android phone.
If your charts are already text and your band is mixed-platform, buy SongbookPro — it is cheaper, it is good, and this page is not going to pretend otherwise.
Come to us if a real part of your book only exists as pictures, and you are tired of the songs you cannot transpose being exactly the ones you needed a tone down.
The full side-by-side, including OnSong and SongSheet Pro, is on the comparison page. Leaving OnSong specifically has its own page. And the capo chart is free and needs no app at all.
Test it on the one thing it is for. Photograph the messiest page in your band book — the one no app has ever been able to transpose — and see what comes back. Three songs free, no account.