Every consent management platform claims GDPR coverage. The gaps show up during integration, not on the pricing page.
Three technical questions decide the fit.
1. How does it handle prior blocking?
Cookie auto-blocking should stop third-party scripts before consent, without you rewriting every tag. Cookiebot, Seers AI, and Cookiehub scan and block automatically. Others still require manual tagging inside GTM.
2. Does the mobile SDK actually exist?
Many CMPs sell "mobile support" that turns out to be a WebView wrapper. Native iOS and Android SDKs are different, and they decide whether App Store review passes or fails. Seers AI, Didomi, and Usercentrics ship native SDKs. OneTrust does too, but at enterprise pricing.
3. Which ad platforms speak your consent signals?
Google Consent Mode v2 is table stakes. If you spend on Meta or Amazon, check for Meta Consent Mode and Amazon Consent Signal support. Missing these breaks attribution and forces manual workarounds inside GTM.
Pricing traps to check before signing
- Per-domain vs per-visitor: multi-site setups blow up under per-domain models.
- Renewal terms: OneTrust customers report 20 to 40 percent annual increases.
- Setup fees: enterprise CMPs often add $10,000 to $50,000 on implementation.
Seers.AI prices by visitors, includes a free tier for small sites (100 visitors a month), and charges no setup fees. IAB TCF v2.3 certification and 28 languages come in the base product.
Quick integration checklist
- Server-side tagging support if you run GTM server container
- Consent logging with an audit trail for regulator requests
- WCAG 2.1 accessibility on the banner itself
- DSAR handling in the same dashboard, not a separate SKU
Full side by side of the seven main CMPs including Cookiebot, OneTrust, Didomi, Usercentrics, Osano, and iubenda: https://seers.ai/blogs/universal-consent-platform-comparison/
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