Do iubenda and OneTrust both support IAB TCF?

Both document it. Statuses come from vendor docs.

Do iubenda and OneTrust 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.

iubenda vs OneTrust: cookie banner speed and features compared

Results forFramework

On emulated mobile, iubenda showed its banner sooner, in a median 2.66 s against 3.92 s for OneTrust. OneTrust delayed the main content 136 ms less. Both held trackers back in every check. Per vendor docs, only iubenda offers a free tier. Per vendor docs, only OneTrust offers self-hosting.

iubendaiubenda

iubenda Tested: Hosted
All iubenda results

OneTrustOneTrust

OneTrust Tested: Hosted
All OneTrust results

Which is faster, iubenda or OneTrust?

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

iubenda and OneTrust on the mobile (emulated) profile, Next.js 16
Question	iubenda	OneTrust	Difference
Banner appearsTime from navigation until the banner is visible on screen. Lower is better.	2.66 sModerate	3.92 sModerate	iubenda’s banner appeared 1.25 s sooner.
Page slowed byExtra time before the main content paints (LCP), compared with the same page without a consent manager.	+612 ms95% interval 600 ms to 624 msNoticeable	+476 ms95% interval 444 ms to 508 msSmall	OneTrust delayed the main content 136 ms less.
Click responds inTime from pressing Accept until the screen updates. Under 200 ms feels instant.	32 msOne visit measuredFast	16 msOne visit measuredFast	OneTrust 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.	+122 KB95% interval: 122 KBModerate	+211 KB95% interval: 211 KBModerate	iubenda added 90 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 We do not publish a direct head-to-head interval yet.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	iubenda	OneTrust
TTFB	No measurable delaypage 6 ms	No measurable delaypage 6 ms
FCP	No measurable delaypage 252 ms	No measurable delaypage 248 ms
LCP	+612 mspage 4.06 s	+476 mspage 3.93 s
CLS	No measurable shiftpage 0.00	No measurable shiftpage 0.00

Load timesMilliseconds from navigation.
Metric	iubenda	OneTrust
CMP script requested
CMP script loaded
Consent state known
Banner visible	2.66 s	3.92 s

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

Which features differ between iubenda and OneTrust?

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 iubenda and OneTrust, from vendor docs
Feature	iubendaiubenda	OneTrustOneTrust
Only iubenda · 1
Free tierPricing	Under 5,000 pageviews a month (vendor documentation, opens in a new tab)	Quote-based pricing (vendor documentation, opens in a new tab)
Only OneTrust · 1
Self-hostableDeveloper	Hosted embed only (vendor documentation, opens in a new tab)	Script only; hosted backend (vendor documentation, opens in a new tab)

Same on both · 14

Features with the same status for iubenda and OneTrust
Feature	iubendaiubenda	OneTrustOneTrust
IAB TCFStandards	TCF v2.2 (vendor documentation, opens in a new tab)	TCF v2.2 and v2.3 (vendor documentation, opens in a new tab)
IAB GPPStandards	Per vendor docs (vendor documentation, opens in a new tab)	Per vendor docs (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	Advanced and Ultimate plans (vendor documentation, opens in a new tab)	Per vendor docs (vendor documentation, opens in a new tab)
Script blockingCompliance	Per vendor docs (vendor documentation, opens in a new tab)	Per vendor docs (vendor documentation, opens in a new tab)
Consent recordsCompliance	Per vendor docs (vendor documentation, opens in a new tab)	Per vendor docs (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	Hosted embed only (vendor documentation, opens in a new tab)	Proprietary (vendor documentation, opens in a new tab)
Headless UIDeveloper	Experimental (vendor documentation, opens in a new tab)	Mobile and CTV only (vendor documentation, opens in a new tab)
TypeScript typesDeveloper	Unknown	Unknown
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)