Stem Checker

Audio QC for stems and multitracks

QC your stems in seconds.

Drop in a delivery and see every problem before it leaves the studio. No DAW required.

See how it works
Mac App StoreDownload for macOS
It’s fast, it’s efficient and it does what it sets out to do efficiently and rather elegantly.

We’ll email a macOS download link. No spam.

As featured inSound On SoundResident AdvisorMusicTechProduction Expert

Instant Verification in Seconds

01

Drop your files

Drag stems straight in from Finder or Dropbox — no session setup, no importing.

Analysis starts the moment they land.

02

Every issue, flagged instantly

Clipping, silent stems, dual-mono exports, duplicates and length mismatches — caught in seconds.

Click any issue to jump to the exact stem, with one-click fixes built in.

Analysis9

Worth Reviewing (9)

Tari Idea 1Very low or no audio detected
Tari MainClipping detected
Tari Main2.00s longer than other stems
Tari Idea 1Possible duplicate of “Tari Idea 2”
Tari Lead bassL & R channels are identical
Convert to Mono
Tari Idea 2L & R channels are identical

03

Play it like a DAW

Every stem in sync, with solo, mute, loop and the shortcuts you already know.

Solos, mutes and A/B switches crossfade, so nothing clicks while you listen.

04

A/B between stems and mix

Compare your separate stem files against a bounced reference — level-matched so you hear real differences.

Reference is auto-detected from the session; Tab to switch between mix and stems instantly.

05Beta

Null test against the mix

The stems are summed and subtracted from the reference, sample by sample. If they add up to the mix, what’s left is silence.

Anything that doesn’t null is highlighted — click it to loop the section and hear exactly what differs.

06

Loudness & peak statistics

True peak, integrated loudness, RMS and DC offset for any stem, the summed stems or the reference.

See how far the stems sum from the mix before you send them.

StatisticsStem sum
StemSumRef

6 active stems, reference excluded

Short-term loudnessLUFS
True peakL−0.8R−1.1dBTP
Integrated loudness−9.4 LUFS
At or over 0 dBFSNone
Sample peakL−1.2R−1.4dBFS
RMSL−12.6R−12.9dBFS
DC offsetL0.0012%R0.0009%
Max short-term−7.2 LUFS
Loudness range6.1 LU
Stem sum vs reference+0.3 LU

07

Convert dual mono to mono

Stereo files whose left and right channels are identical are flagged as dual mono.

Convert them all in one click: true mono copies at about half the size, with your originals untouched.

08

Smart renaming tools

Rename stems individually inline, or open batch rename to strip prefixes, find & replace, and number a whole delivery.

Preview every change before you apply.

Batch Rename
12 stems

Preset

Strip Tari prefix
FindTari →remove

Preview

Tari LEAD VOCALLEAD VOCAL
Tari Lead bassLead Bass
Tari Foley drumsFoley Drums
Tari BVSBVS
Or double-click any stem to rename individually

09

Verify & export

Watch every check turn green once issues are resolved.

Export clean, verified deliverables straight back to Finder or Dropbox.

10New

Share the report as a link

Turn the checks into a delivery report page on stemchecker.io and send the link with your stems.

Only the report is uploaded, never audio. Anyone with the link can open it for 30 days.

1 / 10

Ever bounced or received stems that just aren't right?

These errors slip through every day — and they cost you time, money, and reputation.

Client delivery — 9 files8 potential problems in one delivery
Kick_Snare_FINAL_v3.wav
WAV · 48 kHz · 24-bit
Length mismatch
Exported from a different start point
Bass_print2.wav
WAV · 48 kHz · 24-bit
Dual mono
Mono exported as stereo: L & R identical
Vox BVs.wav
WAV · 48 kHz · 24-bit
✓No problems
Vox BVs copy.wav
WAV · 48 kHz · 24-bit
Duplicate stem
Same audio as “Vox BVs.wav”
Lead Vox.wav
WAV · 48 kHz · 24-bit
Clipping
Digital overs that distort the signal
Audio_01.wav
WAV · 48 kHz · 24-bit
Ambiguous filename
Impossible to tell which track is which
Keys.aif
AIFF · 44.1 kHz · 16-bit
Incoherent metadata
44.1 kHz / 16-bit among 48 kHz / 24-bit
FX_rev.wav
WAV · 48 kHz · 24-bit
Silent stem
An empty file exported by mistake
Stems vs Mix_Bounce.wav
Reference · 48 kHz · 24-bit
Stems vs bounce
The stems don’t sum to the bounced mix

At least one of these slips into 1 of every 3 stem deliveries.

See how they're caught →

Free tools

Check a delivery in your browser

Drop stems below to catch clipping, silence, length mismatches, dual-mono exports and more — nothing is uploaded. Everything runs locally.

Stem Checker

Check your stems.

Drop your WAV or AIFF stems anywhere to begin

Trusted by Audio Professionals

Join hundreds of engineers who've streamlined their workflow.

D

Dean Barratt

Mix Engineer, Producer, Studio Manager

London, England

“As a mix engineer, I send stems out to various people—Atmos mixers, mastering engineers, deliverables for labels, remixes—and now Stem Checker has become part of my process. It's so simple and quick to use loading straight from the Finder, and it saves so much time.”

D

Dan Vinci

Record Producer

“Love this app! It has already saved me so much time as I can quickly check everything's been exported correctly and ready to go. Prevented so much back and forth — absolute time saver!!”

M

Marcus

Mix Engineer

“Managing stems used to turn me into 90% detective and only 10% mixer. Now I can actually focus on the creative work instead of hunting down alignment issues and missing files.”

S

Sarah

Post-Production Supervisor

“It flagged a stem that was slightly shorter than the rest—something I normally wouldn't notice until I'm already mid-session. That alone has saved me from so many awkward client calls.”

J

James

Studio Engineer

“Being able to check multitracks and stems without reopening my DAW is genuinely so nice. No more dragging files back into Pro Tools just to double check things are correct before sending.”

Swipe to see more

Simple, Honest Pricing

Monthly

First month free — cancel anytime

$3.99 / month
  • All issue detection & one-click fixes
  • Level-matched A/B compare
  • Batch rename & export tools
  • Dropbox integration
  • Free updates
Limited-time price

Lifetime

One payment, yours forever

Going up to $39.00$29.99 one-time

Offer ends 1st November

  • All issue detection & one-click fixes
  • Level-matched A/B compare
  • Batch rename & export tools
  • Dropbox integration
  • Free updates

Institution licensing

For universities, colleges, and shared studio labs.

For shared lab Macs
  • Per-machine licensing for shared Macs
  • Activation codes with no student sign-in required
  • Works with direct-download deployment on lab machines
View institution guideContact us

Free to download with two free sessions — pick a plan later, inside the app.

Frequently Asked Questions

Everything you need to know about Stem Checker.

With Stem Checker, simply drag and drop your stem files into the app or use the file picker. The app instantly analyzes all stems for common issues like length mismatches, dual-mono exports, clipping, and sample rate inconsistencies. You can play back all stems in sync, solo or mute individual tracks, and visually inspect waveforms - all without opening a DAW. Any detected issues appear in the Issues Panel with one-click fixes where applicable.

Stem Checker supports all major audio formats including WAV, AIFF, MP3, FLAC, and AAC. We recommend using lossless formats (WAV/AIFF) for professional stem checking.

No hard limits! Our streaming architecture processes files of any size without loading them entirely into memory. You can check as many stems as you need in a single session.

Our algorithm analyzes the audio data across channels to detect when left and right channels contain identical content. This helps identify mono files that were incorrectly exported as stereo, which wastes file space and can cause issues with panning and stereo processing.

Yes! We have native Dropbox integration, allowing you to import and export stems directly from your Dropbox folders.

Stem Checker is free to download and includes two free sessions with all features. After that, choose $3.99/month (your first month is free) or a $29.99 one-time lifetime purchase (a limited-time price — it goes up to $39.00 soon). You can cancel the monthly subscription anytime.

Yes — every download includes two free sessions with access to all features, no credit card required. If you then choose the monthly plan, your first month is free.

In Stem Checker, the built-in A/B comparison tool lets you compare your stems against a reference mix. This makes it easy to identify missing parts, level differences, or export mistakes before sending files to clients, labels, or mastering engineers.

Try Stem Checker now.

We’ll email a macOS download link. No spam.