# Osano vs OneTrust: cookie banner speed and features

On desktop, Osano and OneTrust showed their banners in about the same time. The medians were 644 ms for Osano and 629 ms for OneTrust. Neither added a measurable delay. Both held trackers back in every check. Per vendor docs, only Osano offers open-source code and a free tier. Per vendor docs, only OneTrust offers self-hosting.

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 | Osano | OneTrust | Difference |
| --- | --- | --- | --- |
| How fast does the banner appear? | 644 ms | 629 ms | About the same. They are less than 16 ms apart. |
| Does it slow the page down? | No measurable change | No measurable change | Neither added a measurable delay. |
| How fast does a click respond? | 32 ms | 24 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? | +87 KB (95% interval 85 KB to 87 KB) | +211 KB (95% interval: 211 KB) | Osano added 124 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, Osano showed its banner sooner, in a median 2.15 s against 3.92 s for OneTrust. Osano delayed the main content 52 ms less. Osano failed 2 of 4 checks: the accept check failed and the reject check failed. OneTrust failed none. Per vendor docs, only Osano offers open-source code and a free tier. Per vendor docs, only OneTrust offers self-hosting.

| Question | Osano | OneTrust | Difference |
| --- | --- | --- | --- |
| How fast does the banner appear? | 2.15 s | 3.92 s | Osano’s banner appeared 1.76 s sooner. |
| Does it slow the page down? | +424 ms (95% interval 420 ms to 428 ms) | +476 ms (95% interval 444 ms to 508 ms) | Osano delayed the main content 52 ms less. |
| How fast does a click respond? | 128 ms | 16 ms | OneTrust responded 112 ms sooner. Both are under 200 ms, which feels instant. |
| Does it block trackers until consent? | 2 of 4 checks passed. 2 failed: the accept check failed, the reject check failed | 4 of 4 checks passed | Osano failed 2 of 4 checks: the accept check failed and the reject check failed. OneTrust failed none. |
| How much does it add to the page? | +85 KB (95% interval: 85 KB) | +211 KB (95% interval: 211 KB) | Osano added 126 KB less to the first load. |

## Which features differ?

| Feature | Osano | OneTrust |
| --- | --- | --- |
| IAB TCF | Per vendor docs (TCF v2) | Per vendor docs (TCF v2.2 and v2.3) |
| IAB GPP | Per vendor docs | Per vendor docs |
| 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 |
| Script blocking | Per vendor docs (Paid plans) | Per vendor docs |
| Consent records | Per vendor docs (Paid plans) | Per vendor docs |
| Cookie scanning | Per vendor docs | Per vendor docs |
| Open source | Partial (Older library only) | Not supported (Proprietary) |
| Self-hostable | Not supported (Hosted script) | Partial (Script only; hosted backend) |
| Headless UI | Unknown | Partial (Mobile and CTV only) |
| TypeScript types | Partial (React Native SDK only) | Unknown |
| Free tier | Per vendor docs (About 5,000 pageviews a month) | Not supported (Quote-based pricing) |
| Script tag | Per vendor docs | Per vendor docs |
| React SDK | Not supported (Script tag only) | 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 Osano if

- You want open-source code and a free tier
- Page weight matters to you: Osano added 124 KB less to the first load

### Choose OneTrust if

- You want self-hosting

## Questions about this pair

### Is Osano faster than OneTrust?

Not in a way this run can separate. Their banner times were about the same. They are less than 16 ms apart. Neither added a measurable delay.

### Do Osano and OneTrust both support IAB TCF?

Both document it. Statuses come from vendor docs.

### Do Osano 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.

## Related comparisons

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