Mastering ChainComing soonYour mix, checked where it matters.
The mastering app you use in the car, on AirPods and on your phone speaker — with controls that feel like iPhone, not a shrunken plugin.
For iPhone · 3-day free trial · $25 once, no subscription
Hear it for real
Fix it where you hear it
Studio monitors flatter a mix. Change the master where people will hear it.
In the car
Plug in over CarPlay or AUX and shape the low end in your parked car — where most tracks get played.
On AirPods
Check sibilance, the top end and the stereo image on the headphones everyone uses.
On the phone speaker
Flip to Mono and hear whether the kick and the vocal survive the smallest speaker.
The chain
A real mastering chain
Four blocks in the order engineers use them. Every control is a full-width slider or a switch, and every value has its units.
01
EQ
Eight bands: cuts, shelves and bells.
Cuts up to 48 dB/oct
02
Bus compressor
Glue with ratio, attack and auto release.
Sidechain high-pass
03
Clipper
Extra loudness at the same true peak.
8× oversampled
04
True-peak limiter
Punchy or Clean, ceiling in dBTP.
Safe for streaming
Meters
Meters you can trust
Integrated, short-term and momentary LUFS plus true peak — read the way your DAW's meter reads them.
- −14
- LUFS: see how far Spotify and YouTube will turn your master down
- 1:1
- Match levels every comparison, so louder never fools you
Two results
Take the master. Or the recipe.
Export the master
The whole track through the chain, straight to Files, AirDrop or your messenger.
- File
- final-mix-v3 master.wav
- Integrated
- −9.9 LUFS
- True Peak
- −1.2 dBTP
Take the recipe to your DAW
EQ moves in dB, what the compressor and limiter take, loudness and true peak. Rebuild the master with your own plugins.
EQ
3. Bell · 250 Hz · −2.5 dB · Q 1.40
5. Bell · 2.5 kHz · +1.5 dB · Q 0.90
Bus Compressor
Threshold −18.0 dB · 4:1 · Attack 10 ms
Gain reduction: typically 2.1 dB
Limiter
Punchy · Gain +4.0 dB · Ceiling −1.0 dBTP
Result: −9.8 LUFS · −1.0 dBTP
Your look
Three looks of its own
Console, Midnight or Tape — or let it follow your iPhone with System, Light and Dark.
Midnight
Night blue glass and mint
Pricing
Try it free. Pay once.
Free
$0
Listen, measure and check — free forever.
- Import and play your mixes
- LUFS meters and true peak
- Mono check for the phone speaker
Full version
$25 once
The whole chain, and every update to it.
- EQ, bus compressor, clipper, limiter
- Match and Compare
- Export WAV, AAC or MP3
- Recipe for your DAW
Start a 3-day free trial when you're ready. Nothing is charged. No subscription.
FAQ
Questions
Does it upload my music?
No. Everything runs on your iPhone. Your tracks never leave the device, and the app works offline.
Will the numbers work in my DAW?
Yes. The recipe lists every EQ move with its frequency, gain and Q, how much the compressor and the limiter take, and the loudness and true peak you should land on. Rebuild the master with your own plugins, then check it by ear and by meter.
What can I export?
WAV at 16 or 24 bits or 32-bit float, AAC at 256 kbps or gapless MP3 at 320 kbps — straight to Files, AirDrop or your messenger. The export shows the loudness and true peak of the file itself.
How does the free trial work?
You start the 3-day trial in the app when you're ready; nothing is charged. When it ends, the chain, export and recipe stop working until you unlock the full version for $25, once, with no subscription. Listening and the meters stay free.
Can I use Bluetooth headphones?
Yes. Wireless audio arrives 150–250 ms late and is compressed on the way, so it's fine for balance and loudness; judge the top end and the timing on wired headphones. The app tells you when you're listening over the air.
Is there an iPad or Android version?
Mastering Chain is made for iPhone. There's no Android version for now.
Get notified at launch
Mastering Chain is almost ready. Leave your email and we'll tell you the day it's on the App Store.