Do Didomi and Usercentrics both support IAB TCF?

Both document it. Statuses come from vendor docs.

Do Didomi and Usercentrics block trackers before consent?

Both held trackers back in every check. Each check loads the page. Then it looks for trackers that ran, cookies that the page set or data that left the page before the visitor chose.

Didomi vs Usercentrics: cookie banner speed and features compared

Results forFramework

On emulated mobile, Didomi and Usercentrics showed their banners in about the same time. The medians were 4.41 s for Didomi and 4.16 s for Usercentrics. Usercentrics delayed the main content 436 ms less. Both held trackers back in every check. Per vendor docs, only Didomi offers self-hosting. Per vendor docs, only Usercentrics offers a free tier.

DidomiDidomi

Didomi Tested: Hosted
All Didomi results

UsercentricsUsercentrics

Usercentrics Tested: Hosted
All Usercentrics results

Which is faster, Didomi or Usercentrics?

Shorter bars are better. The exception is tracker blocking, where the bar shows the share of checks passed.

Didomi and Usercentrics on the mobile (emulated) profile, Next.js 16
Question	Didomi	Usercentrics	Difference
Banner appearsTime from navigation until the banner is visible on screen. Lower is better.	4.41 sSlow	4.16 sSlow	About the same. The gap is under 20%, within run-to-run noise.
Page slowed byExtra time before the main content paints (LCP), compared with the same page without a consent manager.	+1.28 s95% interval 1.26 s to 1.29 sLarge	+844 ms95% interval 836 ms to 864 msNoticeable	Usercentrics delayed the main content 436 ms less.
Click responds inTime from pressing Accept until the screen updates. Under 200 ms feels instant.	16 msOne visit measuredFast	Under 16 msOne visit measuredFast	About the same. They are less than 16 ms apart.
Blocks trackersChecks that no tracker runs, the page sets no cookie and no data leaves the page before the visitor chooses.	4 of 4 checks passedBlocked	4 of 4 checks passedBlocked	Both held trackers back in every check.
Adds to pageExtra data transferred during the first load, compared with the same page without a consent manager.	+253 KB95% interval: 253 KBHeavy	+164 KB95% interval: 164 KBModerate	Usercentrics added 89 KB less to the first load.

“About the same” means that the two results fall within each other’s spread. We measure both against the same page without a consent manager. We do not publish a direct head-to-head interval yet.

Page vitals and load times

Lab detail for engineers. All values are medians on the mobile profile. Both CMPs ran on Next.js 16.

Page vitalsChange against the same page without a consent manager.
Metric	Didomi	Usercentrics
TTFB	No measurable delaypage 5 ms	No measurable delaypage 7 ms
FCP	No measurable delaypage 248 ms	No measurable delaypage 252 ms
LCP	+1.28 spage 4.72 s	+844 mspage 4.30 s
CLS	No measurable shiftpage 0.00	No measurable shiftpage 0.00

Load timesMilliseconds from navigation.
Metric	Didomi	Usercentrics
CMP script requested
CMP script loaded
Consent state known
Banner visible	4.41 s	4.16 s

After AcceptMilliseconds from the click.
Metric	Didomi	Usercentrics
Screen responds	16 ms	Under 16 ms
Banner gone
Consent applied
Analytics active

Which features differ between Didomi and Usercentrics?

Statuses come from each vendor’s documentation. Each status links to its source.

Verified by test
Per vendor docs
Partial
Not supported
Unknown

Features that differ between Didomi and Usercentrics, from vendor docs
Feature	DidomiDidomi	UsercentricsUsercentrics
Only Didomi · 2
Self-hostableDeveloper	Assets through your domain (vendor documentation, opens in a new tab)	Hosted backend (vendor documentation, opens in a new tab)
First-party SDKsFrameworks	React (vendor documentation, opens in a new tab)	Script tag only (vendor documentation, opens in a new tab)
Only Usercentrics · 1
Free tierPricing	Contact sales (vendor documentation, opens in a new tab)	1,000 sessions a month (vendor documentation, opens in a new tab)

Same on both · 14

Features with the same status for Didomi and Usercentrics
Feature	DidomiDidomi	UsercentricsUsercentrics
IAB TCFStandards	TCF v2.2 (vendor documentation, opens in a new tab)	Pro plan and up (vendor documentation, opens in a new tab)
IAB GPPStandards	Per vendor docs (vendor documentation, opens in a new tab)	v3 script tag (vendor documentation, opens in a new tab)
Google Consent Mode v2Standards	Per vendor docs (vendor documentation, opens in a new tab)	Per vendor docs (vendor documentation, opens in a new tab)
Google-certified CMPStandards	Per vendor docs (vendor documentation, opens in a new tab)	Per vendor docs (vendor documentation, opens in a new tab)
Global Privacy ControlStandards	Per vendor docs (vendor documentation, opens in a new tab)	Per vendor docs (vendor documentation, opens in a new tab)
Geo-targeted bannersCompliance	Per vendor docs (vendor documentation, opens in a new tab)	Plus plan and up (vendor documentation, opens in a new tab)
Script blockingCompliance	Tag-based (vendor documentation, opens in a new tab)	Paid plans (vendor documentation, opens in a new tab)
Consent recordsCompliance	Per vendor docs (vendor documentation, opens in a new tab)	Kept 12 months (vendor documentation, opens in a new tab)
Cookie scanningCompliance	Per vendor docs (vendor documentation, opens in a new tab)	Per vendor docs (vendor documentation, opens in a new tab)
Open sourceDeveloper	Proprietary (vendor documentation, opens in a new tab)	Commercial licence (vendor documentation, opens in a new tab)
Headless UIDeveloper	Per vendor docs (vendor documentation, opens in a new tab)	Per vendor docs (vendor documentation, opens in a new tab)
TypeScript typesDeveloper	React SDK only (vendor documentation, opens in a new tab)	Per vendor docs (vendor documentation, opens in a new tab)
Script tagFrameworks	Per vendor docs (vendor documentation, opens in a new tab)	Per vendor docs (vendor documentation, opens in a new tab)
First-party SDKsNext.js, Vue, Nuxt, Svelte, SvelteKit, Astro, TanStack Start	Script tag only (vendor documentation, opens in a new tab)	Script tag only (vendor documentation, opens in a new tab)

Should you choose Didomi or Usercentrics?

We built these lists from the measured and documented differences above. Neither list is a recommendation.

Choose Didomi if

You want self-hosting
You want a first-party SDK for React

Choose Usercentrics if

You want a free tier
Page load time matters to you: Usercentrics delayed the main content 436 ms less
Page weight matters to you: Usercentrics added 89 KB less to the first load

What was tested?

Deployment: Both ran from their vendor-hosted services. Network distance to each vendor is part of the result.

How we test: methodology cookiebench-v3.2.4

Questions about Didomi and Usercentrics

Answers come from the benchmark run and from each vendor’s documentation.

Report a correction

Not in a way this run can separate. Their banner times were about the same. The gap is under 20%, within run-to-run noise. Usercentrics delayed the main content 436 ms less.