Castle
What ChatGPT, Claude, Gemini & Grok actually say · August 2026
The verdict
Castle appears in 1 AI-ranked category — best position #3 for device intelligence apis for account takeover prevention.
Combines real-time device intelligence with session-level behavioral risk scoring, enabling automated response policies like step-up MFA or session termination directly at login. Assumes teams prefer an out-of-the-box session risk engine over raw signal collection.
Where Castle falls short, per the models
- Gemini Higher cost and integration surface area than pure fingerprinting APIs, making it overkill for engineering teams that only need raw device identifiers to feed internal models.
Top alternatives per the models: Fingerprint · SEON · Sardine · Incognia
Watch Castle
Boards re-poll weekly and the models change their minds. One short email only when Castle's standing moves — a rank change, a rival overtaking, or new reasoning from the models. Nothing otherwise.
Embed your ranking badge
Castle ranks #3 for best device intelligence apis for account takeover prevention by AI-model consensus. Put the badge in your README, docs or site — it updates automatically as the models re-rank.
[](https://modelsagree.com/best/best-device-intelligence-apis-for-account-takeover-prevention?utm_source=badge&utm_medium=embed&utm_campaign=badge-castle)<a href="https://modelsagree.com/best/best-device-intelligence-apis-for-account-takeover-prevention?utm_source=badge&utm_medium=embed&utm_campaign=badge-castle"><img src="https://modelsagree.com/badge/castle.svg" alt="Castle — ranked #3 for Best device intelligence APIs for account takeover prevention by AI models on ModelsAgree" height="28"></a>Rankings are computed from what the models answer, re-polled on demand · raw reasoning shown verbatim · methodology