AudioBo merges a folder of MP3, AAC, or FLAC files into a single M4B audiobook with chapters, metadata, and cover art, and unlike similar tools it doesn’t force a split once the runtime crosses 24 hours. Batch rename can strip repeated prefixes and renumber chapters with regex, and updating just the metadata or artwork preserves the original audio quality instead of re-encoding it. It’s a one-time purchase at $9.99.