Free, open-source hybrid synthesizer with extensive filters and a flexible modulation engine.
VST3supportedAUsupportedAAXnot supportedCLAPsupportedWINsupportedMACsupportedLNXsupported
Checked September 2026
Surge XT vs Spitfire LABS (2026)
Surge XT is best for budget-conscious producers wanting a fully free, open-source synth with pro-level features; Spitfire LABS is best for producers wanting free, high-quality Spitfire-recorded instruments (legacy plugin, being discontinued Oct 31 2026). Surge XT starts at Free and Spitfire LABS at Free.
Free Spitfire instrument plugin/library set, being sunset in favor of subscription-based Splice INSTRUMENT.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supported
| Surge XT | Spitfire LABS | |
|---|---|---|
| Best for | budget-conscious producers wanting a fully free, open-source synth with pro-level features | producers wanting free, high-quality Spitfire-recorded instruments (legacy plugin, being discontinued Oct 31 2026) |
| Starting price | Free | Free |
| Free version | Yes | Yes |
| Free trial | — | — |
| Formats | VST3, AU, CLAP, LV2, Standalone | VST, VST3, AU, AAX |
| OS | Windows, macOS, Linux | Windows, macOS |
| Key features | Hybrid synthesis engine, Extensive filter selection, Flexible modulation matrix, MPE and microtuning support, Open Sound Control support | Free curated instrument packs, Dedicated lightweight plugin host, Recordings from top studios and artists, Continues to work standalone after the sunset date |
| Developer | Surge Synth Team | Spitfire Audio |
Questions people ask
Surge XT starts at Free; Spitfire LABS starts at Free.
Hybrid synthesis engine, Extensive filter selection, Flexible modulation matrix, MPE and microtuning support, Open Sound Control support.
Free curated instrument packs, Dedicated lightweight plugin host, Recordings from top studios and artists, Continues to work standalone after the sunset date.