A real room, measured at the listening position
A real room measured with Apsis (30 points, 19 October 2026). Press Listen and switch Apsis on and off: the track plays through this room's response, and through the same room with Apsis' own filters. Levels are matched. Best on headphones (on speakers, your own room adds to it).
Music: “ONLY HUMAN” by HoliznaCC0, public domain (CC0).
Features
One measurement. Every speaker, every app, every pair of headphones.
The program follows the microphone
The speakers ping quietly, Apsis hears where the microphone is and guides you around 31 points, so one lucky spot does not decide the result. No tape measure, no typing distances.
Your microphone's calibration file · UMIK found by its serial numberCuts the peaks. Leaves the dips it cannot fix.
Low latency (≈6 ms) for recording, linear phase for mixing, or a mix of both. Strength from 0 to 100 %.
Your whole computer, and your DAW
Inside Windows' own audio engine, or through its own sound device on a Mac, with a profile for each output: speakers on one, headphones on another.
VST3 · Audio Unit · off in exports by default · bypass, mono, side, dimStudio monitors in your headphones
99 models corrected to neutral, then two virtual monitors in a treated control room: near, mid or far field. A short listening test fits them to your ears.
HPDB measurements · SADIE II head responses · the full listPhone, laptop, car
Hear the mix on the systems it will meet, and through two classic studio monitors, without leaving the sweet spot.
Bass phase correction
The port and the speaker's roll-off make the bass arrive late. Apsis lines it up with the rest, without touching the tone.
What the measurement found, as a PDF
Where to sit, the angle of the speakers, room modes and their ringing, reverberation time by octave, early reflections. Advice, in plain words.
A look inside
Clear about what it changes
The graph shows the measurement, the target, the correction and the result, and the text under it says in plain words what was done.
Compact, beside the mixer
- Volume and the levels in dBTP
- Input and clip lights: a sound clipped before it came is seen
- Correction on and off, safe level held
- Stereo, mono, side, one channel or −20 dB
Always at hand
- On and off in one click, to compare
- A profile for each output: speakers on one, headphones on another
- Correction, volume, input and clip lights
- Starts with Windows or the Mac
Speakers: the measurement, the correction and the result.
Pricing
One payment. Yours to keep.
Every feature free for 14 days. No subscription, no expiry, free updates. Move the license to a new computer whenever you need to.
- Room and headphone correction
- System-wide and VST3 plugin
- Free updates
- Everything in the 2-computer license
- Studio, home and laptop
- Free updates
Prices include VAT where it applies. Payments are handled by our reseller Paddle, who also handles invoices and refunds (see the refund policy).
Questions
Before you start
Which microphone do I need?
An omnidirectional measurement microphone with its calibration file: a miniDSP UMIK-1 or UMIK-2 (the program finds the file by the serial number), or an XLR microphone such as the Behringer ECM8000 on your audio interface. Headphones need no microphone.
Are my headphones supported?
99 models are built in, from the HPDB measurements: see the full list. Pick yours in the Headphones tab; no microphone is needed. Any other model can be added from a free measurement file (next question).
My headphones are not in the list. Where do I get a free profile?
From AutoEq, which has free measurements of thousands of models. Open any source folder that has your model, find it and download the file named exactly like it with .csv at the end, for example "Sennheiser HD 600.csv". The other files there (ParametricEQ.txt, GraphicEQ.txt, the .wav filters) do not fit: they are equalizer settings, not measurements. Then in Apsis: Headphones → Import response. AutoEq compares the headphones with its own target, based on Harman's research, so "Flat" then sounds like that target. A text file "frequency dB" of how far your headphones are from neutral works too.
Does it work with my DAW?
Any DAW that loads VST3 plugins: Cubase, Ableton Live, FL Studio, Reaper, Studio One, Bitwig, Cakewalk and others; on a Mac also Logic Pro and GarageBand through the Audio Unit. Pro Tools users can use the system-wide correction.
Will the correction end up in my exported mix?
No. The plugin switches itself off when the DAW renders an export, and keeps the timing exact. You can turn this off if you want to print through it.
Do I need to be online?
Once to start the trial or activate a key, then once a month to confirm the license; it keeps working for 30 days without a connection. Studio computers without internet can be activated from a phone.
Can I move the license to another computer?
Yes. Deactivate it in the program on the old computer, then activate it on the new one.
Is there a Mac version?
Yes, in beta: macOS 11 or later, Apple silicon and Intel, with the system-wide correction, VST3 and Audio Unit. One license covers both: a key for 2 computers can be a PC and a Mac.
Your room, out of the mix.
14 days free, every feature. No card needed.