The complete list of Pro features is the following:

• Advanced chords recognition: more than 700 recognized chords. To ensure complex chord recognition is on, choose “All” on the segmented control below “Chords” 
• Voicing/position recognition: tells you more precisely which chord positions to match well with the song. You can enable/disable voicing/position by using the toggle under “Position” 
• Unlimited saved songs: Build playlists with no limits
• Export transcriptions to PDF: you can check how PDFs look like in FAQ : In Chord ai Pro, what do the chord charts look like when you export to pdf?
• Score editing: Add / remove / edit chords, keys and lyrics, change time signature & more. Use long press gesture to display the edit menu 
• Stems / Multitracks export: Export bass / drums / vocals / other stems as separate wav files
• Audio transposition / Pitch shift
• Alternate tunings: Discover thousands of chord positions in your favorite tunings for all strings instruments guitar / ukulele / bass / mandolin / banjo
• Smart capo: Get capo suggestions to play with more ease or to better match the song.
• Long audio/video support: Process audio up to one hour at once