Surge XT: A Free Synthesizer for GarageBand and Logic Pro on Mac
GarageBand and Logic come with plenty of sounds, but sooner or later you want more synth sounds, and good synth plugins often cost as much as the music software itself.
Surge XT is a powerful synth that costs nothing. It comes with thousands of presets and works in GarageBand, Logic and most other music apps.
What is Surge XT?
Surge XT is a free, open-source hybrid synthesizer developed by a community of volunteers. It runs as an Audio Unit (AU), VST3 or CLAP plugin in music apps like GarageBand, Logic Pro, Ableton Live and Reaper, and also as a standalone app. It includes several synthesis methods, a wide range of effects and modulation, and thousands of presets. Surge XT Effects adds its effects as a separate plugin.
Key features
Thousands of presets
Pads, basses, leads and effects, ready to play.
Works in GarageBand
Loads as an Audio Unit in GarageBand, Logic and more.
Deep sound design
Wavetables, modulation and effects when you want to go further.
How to get started with Surge XT
1. Download Surge XT for macOS from its website or install it with Homebrew.
2. Run the installer to add the AU and VST3 plugins.
3. In GarageBand or Logic, create a software instrument track.
4. Choose Surge XT under Audio Units > Instruments and browse presets.
2. Run the installer to add the AU and VST3 plugins.
3. In GarageBand or Logic, create a software instrument track.
4. Choose Surge XT under Audio Units > Instruments and browse presets.
Prefer the command line? If you use Homebrew, the free package manager for Mac, open Terminal and run:
brew install --cask surge-xt
Tips to get more out of it
• Use the arrows by the preset name to flick through sounds quickly.
• Try the standalone app to explore sounds without a music app.
• Save your favourites to the preset browser as you find them.
• Add Surge XT Effects to other tracks for its reverbs and delays.
• Try the standalone app to explore sounds without a music app.
• Save your favourites to the preset browser as you find them.
• Add Surge XT Effects to other tracks for its reverbs and delays.
Is it really free?
Free and open source. No ads, no account and no paid version.
Pros and cons
| 👍 Pros | 👎 Cons |
|---|---|
| Free and open source | Interface can overwhelm |
| Huge preset library | Deep features take learning |
| AU, VST3 and CLAP | Presets vary in quality |
Who is it for?
Best for: Music makers using GarageBand, Logic and other apps. Works on: Mac, Windows and Linux. Sign-up: Not required.
Surge XT alternatives
• Vital: a popular wavetable synth with a free version (account needed).
• Dexed: a free recreation of the classic Yamaha DX7.
• VCV Rack: a free virtual modular synth for deeper exploration.
• Dexed: a free recreation of the classic Yamaha DX7.
• VCV Rack: a free virtual modular synth for deeper exploration.
FAQ
Does Surge XT work in GarageBand?
Yes. It installs as an Audio Unit, which GarageBand supports.
Is it really free?
Yes. It's open source and developed by volunteers, with no paid version.
The verdict
Surge XT gives you a professional-quality synth for free. If you make music on a Mac, add it to your plugins today.
👉 Try it: surge-synthesizer.github.io
Part of the free creative apps for mac series on johnthecomputerman.co.uk. Follow @johnthecomputerman on Instagram for a new free Mac tool every Monday, Wednesday and Friday. Pricing and features were checked in September 2026 and can change, so check the tool's own site for the latest.
