# Didomi vs Usercentrics: cookie banner speed and features

On desktop, Didomi showed its banner sooner, in a median 466 ms against 672 ms for Usercentrics. Neither added a measurable delay. Both held trackers back in every check. Per vendor docs, only Didomi offers self-hosting. Per vendor docs, only Usercentrics offers a free tier.

We measured both in the same run, in a Next.js app. We measured each against the same page without a consent manager. They also share Script tag, React, Nuxt, Astro, TanStack Start integrations.

## Which is faster on desktop?

Desktop profile: 1365 × 768 · No CPU slowdown · 12.5 MB/s, no added latency.

| Question | Didomi | Usercentrics | Difference |
| --- | --- | --- | --- |
| How fast does the banner appear? | 466 ms | 672 ms | Didomi’s banner appeared 206 ms sooner. |
| Does it slow the page down? | No measurable change | No measurable change | Neither added a measurable delay. |
| How fast does a click respond? | 16 ms | 16 ms | About the same. They are less than 16 ms apart. |
| Does it block trackers until consent? | 4 of 4 checks passed | 4 of 4 checks passed | Both held trackers back in every check. |
| How much does it add to the page? | +253 KB (95% interval: 253 KB) | +164 KB (95% interval: 164 KB) | Usercentrics added 89 KB less to the first load. |

## Which is faster on mobile?

Mobile (emulated) profile: 390 × 844, DPR 3 · Mid-tier phone CPU (4× slowdown) · 200 KB/s, 150 ms latency.

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.

| Question | Didomi | Usercentrics | Difference |
| --- | --- | --- | --- |
| How fast does the banner appear? | 4.41 s | 4.16 s | About the same. The gap is under 20%, within run-to-run noise. |
| Does it slow the page down? | +1.28 s (95% interval 1.26 s to 1.29 s) | +844 ms (95% interval 836 ms to 864 ms) | Usercentrics delayed the main content 436 ms less. |
| How fast does a click respond? | 16 ms | Under 16 ms | About the same. They are less than 16 ms apart. |
| Does it block trackers until consent? | 4 of 4 checks passed | 4 of 4 checks passed | Both held trackers back in every check. |
| How much does it add to the page? | +253 KB (95% interval: 253 KB) | +164 KB (95% interval: 164 KB) | Usercentrics added 89 KB less to the first load. |

## Which features differ?

| Feature | Didomi | Usercentrics |
| --- | --- | --- |
| IAB TCF | Per vendor docs (TCF v2.2) | Per vendor docs (Pro plan and up) |
| IAB GPP | Per vendor docs | Per vendor docs (v3 script tag) |
| Google Consent Mode v2 | Per vendor docs | Per vendor docs |
| Google-certified CMP | Per vendor docs | Per vendor docs |
| Global Privacy Control | Per vendor docs | Per vendor docs |
| Geo-targeted banners | Per vendor docs | Per vendor docs (Plus plan and up) |
| Script blocking | Per vendor docs (Tag-based) | Per vendor docs (Paid plans) |
| Consent records | Per vendor docs | Per vendor docs (Kept 12 months) |
| Cookie scanning | Per vendor docs | Per vendor docs |
| Open source | Not supported (Proprietary) | Not supported (Commercial licence) |
| Self-hostable | Partial (Assets through your domain) | Not supported (Hosted backend) |
| Headless UI | Per vendor docs | Per vendor docs |
| TypeScript types | Partial (React SDK only) | Per vendor docs |
| Free tier | Not supported (Contact sales) | Per vendor docs (1,000 sessions a month) |
| Script tag | Per vendor docs | Per vendor docs |
| React SDK | Per vendor docs (First-party SDK) | Not supported (Script tag only) |
| Next.js SDK | Not supported (Script tag only) | Not supported (Script tag only) |
| Vue SDK | Not supported (Script tag only) | Not supported (Script tag only) |
| Nuxt SDK | Not supported (Script tag only) | Not supported (Script tag only) |
| Svelte SDK | Not supported (Script tag only) | Not supported (Script tag only) |
| SvelteKit SDK | Not supported (Script tag only) | Not supported (Script tag only) |
| Astro SDK | Not supported (Script tag only) | Not supported (Script tag only) |
| TanStack Start SDK | Not supported (Script tag only) | Not supported (Script tag only) |

## Which should you choose?

### Choose Didomi if

- You want self-hosting
- You want a first-party SDK for React
- A fast banner matters to you: Didomi’s banner appeared 206 ms sooner

### Choose Usercentrics if

- You want a free tier
- Page weight matters to you: Usercentrics added 89 KB less to the first load

## Questions about this pair

### Is Usercentrics slower than Didomi?

On the desktop profile, Didomi’s banner appeared in a median 466 ms and Usercentrics’ in 672 ms. Neither added a measurable delay.

### 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.

## Related comparisons

- [c15t vs Usercentrics](https://cookiebench.com/compare/c15t-vs-usercentrics.md)
- [c15t vs Didomi](https://cookiebench.com/compare/c15t-vs-didomi.md)
- [OneTrust vs Didomi](https://cookiebench.com/compare/onetrust-vs-didomi.md)
- [OneTrust vs Usercentrics](https://cookiebench.com/compare/onetrust-vs-usercentrics.md)
- [c15t vs OneTrust](https://cookiebench.com/compare/c15t-vs-onetrust.md)
- [c15t vs CookieYes](https://cookiebench.com/compare/c15t-vs-cookieyes.md)

Methodology [cookiebench-v3.2.4](https://cookiebench.com/methodology). inth, the team behind c15t, maintains CookieBench. c15t is one of the consent managers we measure ([disclosure](https://cookiebench.com/methodology)). Feature support comes from vendor documentation unless a row says "Verified by test".