Overtonium is Benjamin Dehli's free, open-source 32-partial additive synth, laid out like a mixer, with per-harmonic control and continuous equal-to-just microtuning.
Plugin comparison
Overtonium vs Pigments 6
Specs, price and the Dubspot Score, side by side — with our verdict on which synth to buy.
Independent score / workflow fit / buying signal
Contenders
The side-by-side
8.9Great
Pigments 6 (Arturia) — multi-engine flagship soft synth. Score 8.9/10, price $199, formats and comparisons.
Technical matrix
Specs compared
| Signal | Overtonium | Pigments 6 |
|---|---|---|
| Price | Free | $199 |
| Dubspot Score | — | 8.9 |
| Formats | VST3, AU, LV2, Standalone | VST3, AU, AAX |
| Type | Additive synthesizer (32 partials plus noise) | — |
| Sound source | 32 sine oscillators locked to harmonics, plus a noise channel | — |
| Per-partial control | Around 23 controls per channel strip | — |
| Tuning | Continuous equal-to-just TUNE sweep, inharmonic stretch | — |
| Keyboard temperaments | Equal, just, Pythagorean, quarter-comma meantone, Werckmeister III, Young | — |
| Effects | DRIFT, WOBBLE, dual-path tape echo | — |
| Expression | MPE, per-note pitch bend and pressure | — |
| Formats | VST3, AU (macOS), LV2 (Linux), standalone; macOS, Windows, Linux | VST3, AU, AAX |
| Product type | — | multi-engine flagship soft synth |
| Developer | — | Arturia |
| Typical price | — | $199 |
| Primary job | — | wavetable/VA/granular design |
| Catalog status | — | Current as of 2026 |
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