Room EQ Wizard (REW)
REW / John Mulcahy
REW turns a laptop and a measurement microphone into an acoustic measurement system: it generates a sweep, records the response, and returns frequency response, reverberation time by band (RT60, T20, T30), clarity and speech intelligibility, and a background noise spectrum against NC and NR curves.
In engineering that is useful well beyond auditoria: checking background noise in an office or classroom, diagnosing resonance in a plant room, and measuring the effect of acoustic treatment before and after. It also includes modal calculators for rectangular rooms and simulation of absorber effects.
What is missing: the software is entirely free but not open source, and reliable measurement needs a calibrated measurement microphone.
Ratings & Reviews
| Licence type | Completely Free |
|---|---|
| Licence terms | Entirely free software for any use, at no cost and with no time limit. Not open source. Accurate measurement requires a calibrated measurement microphone (separate hardware). |
| Platforms | Linux, macOS, Windows |
| Engineering field | Architecture, Electrical & Electronics, Mechanical Engineering |
| Tool type | Engineering Calculators, Simulation & FEA |
| Vendor site | www.roomeqwizard.com |
This link goes to the vendor site. EngiFree hosts no installers and distributes no cracked versions.
Last verified: 2026-09-07
