If you're looking for a Hooktheory alternative, ChordAI is another good option. It uses deep learning technology to help musicians recognize chords and beats from sources like YouTube, SoundCloud and live microphone input. ChordAI offers a chord dictionary with guitar, piano and ukulele diagrams, and it can convert audio to MIDI and recognize song lyrics. It's a good option for beginners and pros.
Another good option is Staccato, an AI-based service to help musicians write music and lyrics. It offers an AI Instrument that can create music loops, samples and drum tracks based on text prompts, and an AI Lyrics Generator. Staccato also can integrate with common digital audio workstations and notation software, making it a good option for songwriting and music production. It offers several subscription tiers, including a free starter option, so you can pick what works best for you.
If you want to transcribe music, Klangio offers a powerful AI-based service that converts audio recordings into sheet music, MIDI and MusicXML files. It offers tools like Piano2Notes, Guitar2Tabs and Melody Scanner to help you transcribe music fast and accurately. It's good for musicians who need to write and edit sheet music.
Last, you could consider ScoreCloud, which uses AI technology to transcribe audio recordings into sheet music with a minimal amount of human input. It can transcribe both audio and MIDI files, and it's got powerful editing tools, so it's good for musicians, students and teachers.