Every producer has the same loop after a mix is "done". Bounce it. Play it on the phone speaker. Then the earbuds. Then the Bluetooth speaker in the kitchen, the car on the way to the shop, the laptop, the TV. Come back, nudge the low end, bounce again. Repeat until you run out of patience rather than problems.
CheckMyMix exists to end that loop. Load the mix once, at your desk, and switch listening profiles instead of exporting. It is a free download for macOS at quantumaccordbg.com/checkmymix.
This post is deliberately plain about what the first version does, because the alternative — letting you find out with headphones on — is how a tool loses trust it never gets back.
What version 1.0 does
- Opens a WAV or MP3 and plays it, with a real transport: play, pause, resume, stop, a time readout.
- Lays out the nine listening profiles the tool is built around: Budget Phone, Premium Phone, Wired Earbuds, Wireless Earbuds, Laptop Speakers, Bluetooth Speaker, Car Stereo, Car + Subwoofer, Smart TV.
- Has a Bypass switch and a Spectrum panel in the places they will live.
- Is signed and notarised by Apple, so it opens without a warning, on Apple silicon and Intel Macs running macOS 26.5 or later.
What version 1.0 does not do yet
Picking a profile does not change the sound. In 1.0 the profiles are positions in the interface, not processing. The spectrum panel is a placeholder. That is the honest state of the app today.
The processing behind each profile is the next release: frequency-response shaping, bass roll-off, compression and limiting, harmonic distortion, stereo narrowing down to mono, and resonances — combined differently for each profile, so "Budget Phone" sounds like a budget phone rather than like a high-pass filter with a label on it. That architecture — small DSP modules combined into profiles — is the reason the app is built as a desktop application first and not a plugin: the profiles need to be tuned by ear against real playback systems before they are worth putting inside a DAW.
Why representative profiles, not branded devices
The profiles are listening situations, not specific products. "Premium Phone" stands for the range of phones a listener might actually own this year and next, not one model that gets discontinued. A profile tuned to a single device is precise about the wrong thing.
What it is not
Not a mastering plugin. Not another EQ. The goal is confidence that the mix survives the trip from your monitors to a phone in someone's pocket — a translation check, made before release rather than after.
Who it is for
Music producers, mixing engineers, independent artists, and bedroom producers who make records on headphones and find out too late what the low end does on a car stereo.
Where it is going
After the profile DSP lands: a VST3 plugin so the check happens inside the DAW, Windows, new profiles, and eventually a shared library of profiles people build and tune themselves. None of that is in 1.0, and the download page will keep saying exactly which version does what.
Download it at quantumaccordbg.com/checkmymix. If you try it, the most useful thing you can send back is which playback system betrays your mixes most often — that is the profile that gets tuned first.