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An introduction to iZotope Vocal Doubler, based on information from the maker and distributors: what it does, how to use it and who it may suit. It is not scored.
iZotope Vocal Doubler is a free plug-in designed to enhance your vocal with a natural doubling effect…
— iZotope official site
What is Vocal Doubler?
Vocal Doubler is a free vocal plug-in from iZotope. It adds a doubling effect, like a second take sung over the first, to give a voice more richness and depth.
Doubling normally means recording the same phrase several times and layering the takes. iZotope says this plug-in builds that effect on a single track with its doubling technology, which may help when you want to avoid re-recording.
The interface is stripped down: dragging up and down changes stereo separation, and dragging left and right changes human variation. iZotope says the design is meant to shorten the learning curve and get to a good result quickly.
Formats are AU, AAX, VST2 and VST3 (all 64-bit only), with a light CPU load that is said to suit complex sessions. It supports Windows and macOS and is offered as a free download on the official site.
Supported systems are macOS Sonoma (14.7.x), Sequoia (15.7.x) and Tahoe (26.1.x) on Intel and Apple silicon (including via Rosetta 2), and Windows 10 (22H2) and 11 (24H2). Formats are AU, AAX, VST2 and VST3, all 64-bit only.
The hosts listed on the official page are Logic Pro 11, Pro Tools 2024, Ableton Live 12, Cubase 14, Nuendo 14, Studio One 7, Reaper 7, FL Studio 2024, Adobe Audition 2025, Premiere Pro 2025, DaVinci Resolve 19 and Reason 13, covering both music and video editors.
Doubling on a single track
Apply it to one vocal track and get a layered, doubled effect without recording extra takes. It may help when you want to add thickness quickly.
Vertical drag sets stereo separation
Dragging up and down changes how wide the doubled voice spreads, so you decide between centered and wide with one gesture.
Horizontal drag sets human variation
Dragging left and right changes how much natural variation there is between the doubled voices, from tightly matched to more take-like.
Simple, quick controls
The clean interface is meant to shorten the learning curve so you can try it without interrupting your mix workflow.
Light CPU load
iZotope says the CPU load is light, suitable for complex sessions, which matters if you use several instances in a big project.
Wide host and format support
AU, AAX, VST2 and VST3 are supported, with Logic, Pro Tools, Ableton Live, Cubase, Studio One, Reaper, FL Studio and more on the official host list.
Works in video editors too
Premiere Pro and DaVinci Resolve are on the host list, so it may be usable to thicken narration in video work.
Low CPU overhead
iZotope lists low overhead as a feature, which may make it easier to place on several vocals in busy sessions.
Integrated with modern hosts
Operation is listed for recent versions of major DAWs, so it loads from each host's plug-in list.
Specifications
| Item | Details |
|---|---|
| Price | Free |
| Formats | AU / AAX / VST2 / VST3 (all 64-bit only) |
| macOS | Sonoma 14.7.x / Sequoia 15.7.x / Tahoe 26.1.x (Intel and Apple silicon) |
| Windows | Windows 10 (22H2) / Windows 11 (24H2) |
| Controls | Vertical drag = stereo separation, horizontal drag = human variation |
| Supported OS | macOS 14.7.x / 15.7.x / 26.1.x, Windows 10 22H2 / 11 24H2 |
| Plug-in formats | AU / AAX / VST2 / VST3 (64-bit only) |
What is included and system requirements
- Formats: AU, AAX, VST2, VST3 (64-bit only)
- Example supported hosts: Logic Pro 11, Pro Tools 2024, Ableton Live 12, Cubase 14, Nuendo 14, Studio One 7, Reaper 7, FL Studio 2024, Adobe Audition 2025, Premiere Pro 2025, DaVinci Resolve 19, Reason 13
- macOS support covers Intel and Apple silicon (via Rosetta 2 or natively)
How to use it
- Download the free Vocal Doubler from the iZotope website.
- Run the installer and choose the format your DAW supports (VST3, AU and so on).
- Rescan plug-ins in your DAW and check that Vocal Doubler appears.
- Load it as an insert on the vocal track.
- Drag up and down to set the stereo separation.
- Drag left and right to set the human variation.
- Compare with the dry vocal and check the blend against the rest of the mix.
- Play it with the other tracks to confirm the doubling does not hurt lyric clarity.
- Insert it on the vocal track, then drag vertically for stereo separation and horizontally for human variation.
Adding thickness to vocals
It may be useful layered on lead vocals or choruses when you want a chorus-like thickness.
Cutting re-recording in home studios
When recording the same take repeatedly is a chore, you could try building the double from a single take.
Podcasts and narration
A light touch may add width to a voice for a produced feel.
Rap doubles and phrase endings
It may offer a quick way to add doubles to rap lines or phrase ends.
Adding thickness to unrepeatable takes
It may be worth trying when a take cannot be re-recorded but you want a layered feel.
Who it may suit
- People who want to try vocal doubling for free
- Home-studio users who find re-recording the same take tiring
- Those who prefer a few controls over a crowded interface
- Users with limited CPU headroom
Good to know before you buy
- It is 64-bit only and will not run in 32-bit hosts.
- Listed OS support is macOS Sonoma/Sequoia/Tahoe and Windows 10 (22H2)/11 (24H2).
- Free offers can change, so check the official page before downloading.
- The product page does not say whether an account is needed to download; iZotope links a general product authorization article.
Price
Free to use (iZotope official site, checked 2026-10-27).
See Vocal Doubler on the product page
Sources: izotope.com (checked 2026-10-27)
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