Do Osano and Usercentrics both support IAB TCF?

Both document it. Statuses come from vendor docs.

Do Osano 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.

Osano vs Usercentrics: cookie banner speed and features compared

Results forFramework

On desktop, Osano and Usercentrics showed their banners in about the same time. The medians were 644 ms for Osano and 672 ms for Usercentrics. Neither added a measurable delay. Both held trackers back in every check. Per vendor docs, only Osano offers open-source code.

OsanoOsano

Osano Tested: Hosted
All Osano results

UsercentricsUsercentrics

Usercentrics Tested: Hosted
All Usercentrics results

Which is faster, Osano or Usercentrics?

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

Osano and Usercentrics on the desktop profile, Next.js 16
Question	Osano	Usercentrics	Difference
Banner appearsTime from navigation until the banner is visible on screen. Lower is better.	644 msModerate	672 msModerate	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.	No measurable delay95% interval −20 ms to 20 msNone	No measurable delay95% interval −16 ms to 16 msNone	Neither added a measurable delay.
Click responds inTime from pressing Accept until the screen updates. Under 200 ms feels instant.	32 msOne visit measuredFast	16 msOne visit measuredFast	Usercentrics responded 16 ms sooner. Both are under 200 ms, which feels instant.
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.	+87 KB95% interval 85 KB to 87 KBLight	+164 KB95% interval: 164 KBModerate	Osano added 77 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 We do not publish a direct head-to-head interval yet.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 desktop profile. Both CMPs ran on Next.js 16.

Page vitalsChange against the same page without a consent manager.
Metric	Osano	Usercentrics
TTFB	No measurable delaypage 6 ms	No measurable delaypage 5 ms
FCP	No measurable delaypage 68 ms	No measurable delaypage 64 ms
LCP	No measurable delaypage 120 ms	No measurable delaypage 120 ms
CLS	No measurable shiftpage 0.00	No measurable shiftpage 0.00

Load timesMilliseconds from navigation.
Metric	Osano	Usercentrics
CMP script requested
CMP script loaded
Consent state known
Banner visible	644 ms	672 ms

After AcceptMilliseconds from the click.
Metric	Osano	Usercentrics
Screen responds	32 ms	16 ms
Banner gone
Consent applied
Analytics active

Which features differ between Osano 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 Osano and Usercentrics, from vendor docs
Feature	OsanoOsano	UsercentricsUsercentrics
Only Osano · 1
Open sourceDeveloper	Older library only (vendor documentation, opens in a new tab)	Commercial licence (vendor documentation, opens in a new tab)
Not confirmed for one side · 1
Headless UIDeveloper	Unknown	Per vendor docs (vendor documentation, opens in a new tab)

Same on both · 14

Features with the same status for Osano and Usercentrics
Feature	OsanoOsano	UsercentricsUsercentrics
IAB TCFStandards	TCF v2 (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	Paid plans (vendor documentation, opens in a new tab)	Paid plans (vendor documentation, opens in a new tab)
Consent recordsCompliance	Paid plans (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)
Self-hostableDeveloper	Hosted script (vendor documentation, opens in a new tab)	Hosted backend (vendor documentation, opens in a new tab)
TypeScript typesDeveloper	React Native SDK only (vendor documentation, opens in a new tab)	Per vendor docs (vendor documentation, opens in a new tab)
Free tierPricing	About 5,000 pageviews a month (vendor documentation, opens in a new tab)	1,000 sessions a month (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 SDKsReact, Next.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 Osano or Usercentrics?

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

Choose Osano if

You want open-source code
Page weight matters to you: Osano added 77 KB less to the first load

Choose Usercentrics if

Nothing measured or documented here favours Usercentrics. Decide on price, support and the tools that you already use

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 Osano 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. Neither added a measurable delay.