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4 Open Source Autotune Plugins

Pitch Correction is a necessary tool for every producer, letting you correct pitch mistakes in monophonic audio and sometimes polyphonic audio. With expensive tools like Melodyne or Antares Auto-Tune, it can be hard to get your hands on a good pitch correction plugin.

Free autotune VST plugins are a nice alternative but are often limited in terms of software development (which is where open-source software gets an upper hand). With some programming know-how, you'll be able to use these pitch correctors as a platform to build your own bespoke plugin.

If you're looking for a more simple take on pitch correction, you should get a 3rd party VST plugin that isn't open source. The open-source plugins are few and far between and are only reserved for advanced developers.

What Are The Best Open Source Autotune Plugins?

You'd be surprised, but there are not a lot of choices around for open-source auto-tune plugins. No matter what, you'll always be making some compromises, so if you're looking for something simple to just drop into your DAW and start using, these won't be for you.

That being said, open-source plugins allow for something that VSTs could never do. That's customizability. With enough coding knowledge, you can make any of these plugins into the perfect package for you.

1. AutoTalent by Tom Baran

Compatibility: Linux / Open Source, 32-bit/64-bit
Price: FREE

autotalen open source autotune

Pros

✅ Easy-to-understand GUI

✅ Formant shifting

✅ Vibrato function

✅ Scale and Moder Correction settings

✅ Good for hard-tuned sound

Cons

❌ Desired notes need to be specified

❌ Clunky interface compared to other autotune plugins that aren't open source

❌ Autotune is not as good as non-open-source autotune plugins

Tom Baran's Autotalent is easily the best open-source autotune plugin, mimicking almost every feature you could get with a Pro pitch correction plugin.

Autotalent is almost 15 years old at this point, so it might not be the most sophisticated plugin out there, but it will certainly do the job.

With real-time pitching functionality as well as hard-tuning capabilities you can do much more than just adjust your pitch. The added artificial vibrato and formant controls make Autotalent into an even more powerful sound-design tool.

You can also easily change the scale of any melody between major and minor keys, as well as change the mode of your melody.

With Autotalent you'll have to pre-select the pitches you want your melody to hit. This was built to work with not only vocals but any other monophonic melody.

When it comes to open-source pitch correction, AutoTalent is easily the most feature-rich one out there. With options to harmonize to a specified scale and other bespoke functions, AutoTalent can realistically replace your other free autotune vst plugins.

That being said, AutoTalent is not as natural or transparent sounding like the big players in the pitch correction space. You can get away with a lot, but there are some instances where AutoTalent starts to sound overly surgical and digital.

This could be great if that's what you're looking for, but for a more natural pitch correction, AutoTalent might not be for you.

Autotalent is an open-source LADSPA plugin and can be compiled to function on most operating systems.

2. Outotune by Richard Hladik

Compatibility: Linux / Open Source, 32-bit/64-bit

Price: FREE

Pros

✅ Rich and warm sound

✅ Easy to use and set up

✅ MIDI-controlled pitch correction

✅ Easy Reharmonization

✅ Can be used as a Vocoder

Cons

❌ Issues with Latency at higher Buffer Sizes

❌ Awful GUI

❌ Not the best autotune sound when compared to non-open-source plugins

Richard Hladik's Outotune is a bit of a step away from pitch correction, rather, functioning as a harmonize. Inspired by Jacob Collier's Harmonizer, Outotune is a tool that will let you become a one-person choir.

Outotune works by resynthesizing your vocal at different pitches, which can be controlled by MIDI. This lets you harmonize with yourself, or even play in a different melody for your vocal.

This will not be the pick for those of you looking for a natural, transparent pitch correction utility. This is much better suited for sound design purposes and writing music. While you can use this to correct your vocals, it's not built for that.

Additionally, this LV2 plugin can give you an instant estimate of your fundamental frequency. This means that at any point you can view the pitch parameter and see what notes are going into the plugin.

The GUI of Outotune is, to put it lightly, barren and won't provide you with much information, but usually, you won't even need to look at the plugin other than the initial setup.

The only big drawback to Outotune is the noticeable latency at higher buffer sizes. The speech analysis system doesn't work in real-time either due to the latency limitations of this plugin. Lower buffer sizes allow for real-time synthesis, so it shouldn't be a big issue!

3. Data-Driven Pitch Corrector by Sannawag

Compatibility: Linux, Windows / Open Source, 32-bit/64-bit

Price: FREE

Pros

✅ Pitch Correction using a trained AI model

✅ Easy to monitor incoming pitch values

✅ Able to train own correction model

Cons

❌ Limited in its controls

❌ No GUI

Sannawag's Data-Driven Pitch Corrector is a very interesting, yet simple take on pitch correction, based on the pitch dataset creation paper by S.Wager,  G. Tzanetakis, C. Wang, S. Sullivan, J. Shimmin, M. Kim, and P. Cook.

DDPC is trained on real-world examples of singing and melodies that are in tune. You can also train your own model, but a pre-trained one is available.

Essentially what DDPC does is compute the pitch of every note in your vocal performance, outputting a constant stream of pitch values. These are then rounded up to the nearest semitone and corrected with the included pitch-shifter.

You can also change the intonation of your pitch correction, so you could even auto-tune outside of the standard concert pitch.

As an open-source plugin to dive into and edit, this is probably the best on the list. The inner workings of the plugin are quite simple, not taking into consideration any model training.

From experience, DDPC tends to be a bit lacklustre. The lack of a GUI makes it even more clunky to use. Some recordings, it can do wonders for, achieving almost transparent pitch correction. Other recordings can get completely messed up and it's hard to tell why there's a difference.

A great base to start from, DDPC has tons of potential for you to explore!

4. AM Pitchshifter LADSPA by Steve Harris

Compatibility: Linux / Open Source, 32-bit/64-bit
Price: FREE

am pitch shifter open source autotune

Pros

✅ Clean sounding pitch shifting

✅ Easy operation

✅ Great for sound design

Cons

❌ For automatic tuning, needs to be used in tandem with PitchScaleHQ

❌ Not the best for clean and transparent pitch correction

Steve Harris is a legend when it comes to open-source audio utility plugins. His LADSPA collection features over a hundred different tools, fx and utilities to choose from.

With that in mind, the collection doesn't have a dedicated pitch correction plugin at the present moment.

The AM Pitch shifter, used in tandem with his PitchScaleHQ plugins can give you similar results to an auto-tune plugin.

AM Pitchshifter is quite straightforward, taking one pitch and letting you change it to another. There are two main controls which are the pitch shift slider, and the buffer size slider.

The buffer size especially is an interesting setting to mess around with. Low buffer sizes can get you a fluttery vocal effect, while larger buffer sizes can start to sound like a flanger or an echo.

Probably most useful for sound design purposes, AM Pitchshifter is an interesting tool to explore.

PitchScaleHQ is a pitch shifter that's made to scale the harmonics based on your base frequency. This lets you do some general-purpose pitch correction and can be used in tandem with AM Pitchshifter to achieve quite convincing results.

They won't give Melodyne or AutoTune a run for their money, but it works, and you can make it even better with some coding knowledge!

Summary

Most producers will stick with the popular options, the Melodynes and auto-tunes of the world. Some will focus on the free options (if this is you, check out this awesome list of free-autotune vst plugins)

But again, there are some who would like to take on the task of creating a bespoke plugin for themselves. These picks for the 4 best open-source autotune plugins will be the best starting point in your journey!

If you enjoyed this list, make sure to check out some of our other awesome articles, tutorials and reviews below!

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