Metering and Analysis Plugins Guide for Better Mixes

Why Your Ears Alone Will Get You In Trouble

Your ears lie. Not because they're bad tools, but because they adapt. Spend 90 minutes on a mix and your brain starts filling in the gaps, compensating for things that aren't actually there.

Metering doesn't replace trained ears. It catches the mistakes your ears stop noticing.

We've taken mixes that felt finished, run them through a loudness meter, and watched the integrated LUFS read at -9 when Spotify's normalization target is -14. That's not a small difference. That's a mix that sounds distorted on every phone speaker the second the algorithm applies gain reduction.

That's the case for metering. Not to make your music sound better in some abstract sense, but to stop specific, preventable mistakes from shipping with your record.

This guide covers every category of metering plugin worth knowing: loudness, spectral analysis, stereo correlation, and the emerging multichannel metering you'll need if you're working toward Dolby Atmos delivery. We'll tell you what's free, what's worth paying for, and where most producers get it wrong in 2025.

See our tested picks for the best metering plugins

What Are the Different Types of Metering Plugins?

Loudness Meters (LUFS and True Peak)

Loudness meters read your signal against broadcast and streaming standards. The two numbers you care about are Integrated LUFS and True Peak.

Integrated LUFS is the average loudness over an entire track. Spotify targets -14 LUFS. Apple Music and Tidal land around -16 LUFS. YouTube sits at -14. Broadcast (EBU R128) targets -23 LUFS with a True Peak maximum of -1 dBTP.

True Peak is different from sample peak. It accounts for inter-sample peaks: moments where the reconstructed analog signal clips even though no individual sample touched 0 dBFS. We've seen mixes pass their DAW's clip indicator but fail True Peak at -0.2 dBTP. That causes distortion in lossy codecs like AAC and MP3.

The most satisfying workflow is keeping a loudness meter on your master bus through the whole session, not just at the end. Watching Integrated LUFS creep toward your target as you balance the arrangement teaches you things no tutorial can.

Spectrum Analyzers

A spectrum analyzer shows you the frequency content of your signal in real time. It won't tell you whether something sounds good. It will tell you whether you have 8dB of buildup at 200Hz that your mix room is masking.

We love using a spectrum analyzer during reference comparisons. Load your reference track on one channel, your mix on another, and flip between them while watching the analyzer. The gap between the curves is the work.

This is where producers lose time when they don't have a good analyzer: they'll chase a frequency problem by ear through 20 plugin passes when a 10-second look at the spectrum would've shown a 6dB shelf difference below 100Hz.

Stereo Correlation Meters

Correlation meters show how similar the left and right channels are. A reading of +1 means perfectly mono-compatible. A reading of 0 means no correlation. Negative values mean phase cancellation, and anything below -0.3 will sound ugly on a mono speaker.

The frustrating thing is that problematic stereo issues often sound brilliant on headphones and terrible on anything else. Mid-side processing gone wrong, a reverb with excessive stereo width, a chorus effect on a bass track: all of these can push correlation into the negative without you noticing until the mix collapses to mono.

A correlation meter at the end of your signal chain is the fastest way to catch these before they leave your studio.

Which Free Metering Plugins Are Actually Worth Using?

We'd build the free stack first. The paid options add workflow features, not fundamentally better readings.

Voxengo SPAN (Free)

SPAN is the underrated workhorse of free spectrum analysis. It draws a clean FFT spectrum in real time, with adjustable slope, averaging time, and channel configurations. We've run it on individual tracks, buses, and the master chain simultaneously using multiple instances.

The display is configurable enough for professionals and readable enough for beginners. It handles stereo, mid-side, and multi-channel signal routing without a paid upgrade. Check the manufacturer's site for current pricing on any premium variants, but the core plugin is free.

Youlean Loudness Meter 2 (Free / $49 Pro)

The free version of Youlean reads Momentary, Short-Term, and Integrated LUFS simultaneously alongside True Peak and Loudness Range. That's the full EBU R128 spec, free.

We ran the free version against a calibrated reference loudness meter on the same signal. The readings matched to within 0.1 LU. That's not bad, that's accurate.

The $49 Pro version adds streaming presets for Spotify, Apple Music, YouTube, and broadcast standards, batch file analysis, and a timeline view that shows loudness changes across the track. Worth it if you're mastering regularly. Annoying that you need to pay to unlock the streaming presets specifically, but the free version still tells you the number you need.

Voxengo Correlometer (Free)

Free, accurate, does one job. Stick it on your master bus. A reading below -0.3 means fix the stereo field before you bounce.

The combination of SPAN, Youlean free, and Correlometer costs nothing and covers spectrum, loudness, True Peak, and stereo correlation. That's the full picture.

When Should You Pay for a Metering Plugin?

Pay when your workflow outgrows what free tools handle. Specifically: multichannel metering, batch analysis, and integrated A/B reference workflows.

dpMeter 5 (Paid)

dpMeter 5 supports EBU R128, ITU-R BS.1770-4, and True Peak across multichannel configurations including 5.1, 7.1, and Dolby Atmos deliverables. If you're submitting anything to broadcast or working in immersive audio, you need something like this.

Check the manufacturer's site for current pricing. It's not expensive relative to professional broadcast tools, but it's a different tier from the free stack.

HOFA IQ-Analyser V2

We'd pick HOFA when frequency analysis needs to go beyond what SPAN shows. The IQ-Analyser adds spectrogram view (frequency over time), multi-instance correlation with reference import, and a display that's frankly more readable at a glance under session pressure.

The spectrogram view is clever. We caught a low-frequency resonance at 63Hz on a room mic that only appeared between bar 8 and bar 16, timed with a specific vocal performance. The FFT average never showed it. The spectrogram showed exactly where it lived in time.

Compare the best spectrum analyzer plugins

How Do You Use Metering Plugins Correctly in a Mix Session?

Gain Staging First

Before you trust any loudness reading, your gain staging needs to be correct. If individual tracks are clipping at the input stage, your Integrated LUFS reading is telling you about distortion, not loudness.

Target around -18 dBFS RMS on individual channels. Your master fader should have at least 6dB of headroom before you hit any limiting.

Reference Track Metering

This is the workflow most guides skip. Load your reference track into your session. Route it through the same loudness meter as your mix. Match Integrated LUFS between the two.

We did this during a recent mix and hated what we saw. Our track read -12 LUFS integrated. The reference read -14.2. We'd been loudness-matching with our ears by turning the reference down slightly, which meant we'd been comparing our loud mix to a quieter reference for 45 minutes, convincing ourselves it sounded better.

Once we matched LUFS, the reference had more clarity in the high-mids by a clear margin. That's 45 minutes of wrong decisions the meter caught in 30 seconds.

True Peak Before Delivery

Set a True Peak maximum of -1 dBTP for streaming and -2 dBTP for anything that'll get processed further (like a master going to a distributor for encoding). Run your bounced file back through a loudness meter after export. Your limiter's ceiling in the plugin may not match the final rendered file's True Peak, especially with certain plugin chain orders.

We've shipped files that were True Peak clean in the session and measured at -0.3 dBTP after the render. The render process itself can introduce inter-sample peaks. Always measure the bounce, not the session.

What About Multichannel Metering and Dolby Atmos?

Dolby Atmos delivery specs require integrated loudness of -18 LUFS (dialogue-gated) for cinema, and -16 LUFS (ungated) for streaming. True Peak maximum is -1 dBTP across all channels including the LFE, which is a different requirement than most stereo engineers are used to tracking.

The free stack doesn't handle multichannel correctly. SPAN can display multichannel routing, but Youlean Loudness Meter 2 free won't measure Atmos beds and objects properly.

dpMeter 5 handles multichannel LUFS measurement. If you're working in a DAW that supports Atmos natively (Logic Pro, Pro Tools Ultimate, Nuendo), you'll need a meter that matches those bus configurations. This is one case where we'd skip the free stack entirely and go straight to a paid solution.

The Dolby Atmos Renderer has built-in metering for internal use, but it's not a plugin you can slot into a general metering chain. Treat it as a final check, not a session tool.

Best loudness metering plugins for streaming and broadcast

Summary

Metering plugins catch what ears miss. Start with the free stack: Voxengo SPAN for spectrum, Youlean Loudness Meter 2 for LUFS and True Peak, and Voxengo Correlometer for stereo health. That covers 90% of mixing and mastering needs at zero cost. Upgrade to dpMeter 5 or HOFA IQ-Analyser V2 when you need multichannel support, batch processing, or spectrogram analysis. Always measure your bounce, not just your session. Match LUFS before any reference comparison. Check True Peak before every delivery.