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Neothesia vs MIDITrail: catalog facts
Neothesia	MIDITrail
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free download from the developer's site.
Windows, macOS, Linux	Windows, macOS, iOS
Makes note timing visible while exploring a MIDI score.	3D visualization of MIDI notes during playback Built-in wavetable synthesizer
Uses MIDI files rather than recognizing notes from ordinary audio.	Plays MIDI files only, not audio recordings DLS sound files are no longer supported on macOS
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.