FIRDesign Available
A linear- and minimum-phase FIR filter designer for loudspeakers and rooms. Design by hand and from measurements, then export for your convolver.
Formantus — shape your sound
Modern, cross-platform FIR and room-correction tools for loudspeakers and rooms. Design a correction by hand and from measurements, see exactly what it does, then export a filter for your convolution engine.
One-time purchase, no subscription. Works fully offline. No account.
One family, three tools
A shared design language and stack across the whole signal chain — measure your system, design the correction, and (soon) simulate the room.
Measurement Free Coming soon
Capture your system with a sound card and microphone — sweep to impulse response with reflection gating — and hand the result straight to FIRDesign.
In development
RoomSim Coming soon
A room-acoustics app on the same stack — explore placement, modes and reflections before you reach for a filter.
In development
Why Formantus
Built in the spirit of the classic tools, brought up to date — modern, automated, and genuinely cross-platform.
Truly cross-platform
Native macOS on Apple Silicon and Intel, plus Windows and Linux on both ARM and x86. The same app, everywhere you work.
Self-contained
Every installer bundles a trimmed runtime — there is nothing else to install and no dependencies to chase.
Automated, not opaque
Auto-EQ, fidelity-aware auto-centering, an Auto window and excess-phase correction do the heavy lifting — on top of full manual control.
Works fully offline
No account, no telemetry, no phone-home. License activation is offline too. Your work stays on your machine.
Actively developed
A current product, not a frozen one. All 1.x updates are free for license holders.
See exactly what you did
High-resolution charts for magnitude, phase, group delay, impulse and error, with an audibility-graded design check.
Ready to shape your sound?
Try every feature free, then unlock with a one-time $39 license. No subscription, no account.