Synth1
Synth1: A focused free synth for core subtractive sounds inside compatible DAWs. Ranked #18 of 38 in Software Synthesizers by our editors (7.6/10); pricing: Free plan; best for simple free subtractive synthesis.
At a glance
- Editor score7.6 / 10
- PricingFree plan
- Best forSimple free subtractive synthesis
- Free planYes
- Paid fromFree
- Synthesis engineAnalog_modeling
- Facts checked20 Sep 2026
Where it wins
- Free virtual-analog synthesis with two oscillators and a sub-oscillator
- FM, ring modulation, sync, filters, LFOs, and arpeggiation
- Supports Windows and macOS with automation and 32-note polyphony
Where it doesn't
- Runs only as a plug-in and has no standalone application
- Uses older VSTi 2.4 and AU version 2 formats
- The Windows edition is the one listed with 128 factory presets
Our verdict on Synth1
Synth1 is a freeware virtual-analog software synthesizer for computer music production. It is aimed at producers who want a focused subtractive instrument inside a compatible DAW, rather than a standalone application. Its synthesis engine combines two oscillators with one sub-oscillator, FM modulation, ring modulation, oscillator sync, four filter types, two host-synchronized LFOs, and an arpeggiator. Up to 32-note polyphony, legato, portamento, and parameter automation support playable patches and DAW-based control.
Pricing is straightforward: Synth1 is free, with a free plan and no paid tier described. The Windows edition supports VSTi 2.4, while the macOS edition is an AU version 2 plug-in. That makes the product relevant for musicians whose DAW supports one of those formats, but its plug-in-only design rules out users looking for a self-contained instrument. The included factory preset count is 128 for the Windows edition. Effects include tempo delay and stereo chorus/flanger, adding basic sound-shaping options without changing the product’s focused scope.
Synth1’s main strength is the range of core subtractive controls available in a small instrument: filters with distortion or saturation, synchronized modulation, arpeggiation, and automation cover common production tasks. It is a sensible pick for beginners, budget-conscious producers, and anyone seeking a direct virtual-analog workflow. Choose another synthesizer if you need a standalone app, newer plug-in formats, a broader feature set, or a product designed around advanced synthesis beyond its compact analog-modeling approach.
Your product? Our editors can test Synth1 in depth and publish a review, labelled as paid · from $149/mo →
Synth1 pricing
Synth1 fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Synthesis engine | Analog_modeling |
| Plugin formats | VSTi 2.4, AU version 2 |
| Standalone app | No |
| Supported platforms | Windows_macos |
| Included presets | 128 presets |
| MPE support | Not verified |
| Deployment | Desktop |
| Platforms | Windows, macOS |
| Support | Email, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | daichilab.sakura.ne.jp |
| Facts checked | 20 Sep 2026 |
Alternatives to Synth1
- Arturia V Collection 11A broad, preset-focused instrument collection with clear Intro and Pro options.9.3
- Kontakt 8A broad sample-library platform with serious synthesis and DAW integration.9.1
- DivaA deep analogue-style plug-in with broad modulation, effects and host-format support.8.8
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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