Do Ketch and OneTrust both support IAB TCF?

Both document it. Statuses come from vendor docs.

Do Ketch 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.

Ketch vs OneTrust: cookie banner speed and features compared

Results forFramework

On desktop, OneTrust showed its banner sooner, in a median 629 ms against 1.68 s for Ketch. Ketch delayed the main content by 0 ms. OneTrust added no measurable delay. Both held trackers back in every check. Per vendor docs, only Ketch offers open-source code and a free tier. Per vendor docs, only OneTrust offers self-hosting.

KetchKetch

Ketch Tested: Hosted
All Ketch results

OneTrustOneTrust

OneTrust Tested: Hosted
All OneTrust results

Which is faster, Ketch or OneTrust?

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

Ketch and OneTrust on the desktop profile, Next.js 16
Question	Ketch	OneTrust	Difference
Banner appearsTime from navigation until the banner is visible on screen. Lower is better.	1.68 sSlow	629 msModerate	OneTrust’s banner appeared 1.05 s sooner.
Page slowed byExtra time before the main content paints (LCP), compared with the same page without a consent manager.	0 msSmall	No measurable delay95% interval −20 ms to 20 msNone	Ketch delayed the main content by 0 ms. OneTrust added no measurable delay.
Click responds inTime from pressing Accept until the screen updates. Under 200 ms feels instant.	40 msOne visit measuredFast	24 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.	+532 KBHeavy	+211 KB95% interval: 211 KBModerate	OneTrust added 321 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 We do not publish a direct head-to-head interval yet.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	Ketch	OneTrust
TTFB	0 mspage 5 ms	No measurable delaypage 6 ms
FCP	−4 mspage 60 ms	No measurable delaypage 60 ms
LCP	0 mspage 116 ms	No measurable delaypage 124 ms
CLS	No measurable shiftpage 0.00	No measurable shiftpage 0.00

Load timesMilliseconds from navigation.
Metric	Ketch	OneTrust
CMP script requested
CMP script loaded
Consent state known
Banner visible	1.68 s	629 ms

After AcceptMilliseconds from the click.
Metric	Ketch	OneTrust
Screen responds	40 ms	24 ms
Banner gone
Consent applied
Analytics active

Which features differ between Ketch 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 Ketch and OneTrust, from vendor docs
Feature	KetchKetch	OneTrustOneTrust
Only Ketch · 2
Open sourceDeveloper	SDKs and samples only (vendor documentation, opens in a new tab)	Proprietary (vendor documentation, opens in a new tab)
Free tierPricing	5,000 users (vendor documentation, opens in a new tab)	Quote-based pricing (vendor documentation, opens in a new tab)
Only OneTrust · 1
Self-hostableDeveloper	Hosted service (vendor documentation, opens in a new tab)	Script only; hosted backend (vendor documentation, opens in a new tab)
Not confirmed for one side · 1
TypeScript typesDeveloper	Per vendor docs (vendor documentation, opens in a new tab)	Unknown

Same on both · 12

Features with the same status for Ketch and OneTrust
Feature	KetchKetch	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	Per vendor docs (vendor documentation, opens in a new tab)	Per vendor docs (vendor documentation, opens in a new tab)
Script blockingCompliance	Tag orchestration (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)
Headless UIDeveloper	Per vendor docs (vendor documentation, opens in a new tab)	Mobile and CTV only (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 Ketch or OneTrust?

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

Choose Ketch if

You want open-source code and a free tier

Choose OneTrust if

You want self-hosting
A fast banner matters to you: OneTrust’s banner appeared 1.05 s sooner
Page load time matters to you: Ketch delayed the main content by 0 ms. OneTrust added no measurable delay
Page weight matters to you: OneTrust added 321 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 Ketch and OneTrust

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

Report a correction

On the desktop profile, OneTrust’s banner appeared in a median 629 ms and Ketch’s in 1.68 s. Ketch delayed the main content by 0 ms. OneTrust added no measurable delay.