Free / Open-sourceUnified observability, security and incident response for cloud-scale engineering teams
Free / Open-sourceUnified observability, security and incident response for cloud-scale engineering teams
Fiddler AI records 44,204 monthly visits with -10.2% month-over-month growth and Contact for Pricing pricing. hCaptcha records 5,446,045 monthly visits with +18.7% growth and Freemium, Free Trial, Contact for Pricing, Free pricing.

The control plane for trusted enterprise agents and models
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | fiddler.ai | hcaptcha.com |
| Pricing Model | Contact for Pricing | Freemium, Free Trial, Contact for Pricing, Free |
| Monthly Visits | 44.2K (44,204) | 5.45M (5,446,045) |
| MoM Traffic Delta | -5.04K (-10.2%) | +858.28K (+18.7%) |
| Primary Market & Share | 🇺🇸 United States (28.4%) | 🇺🇸 United States (18%) |
| Direct Visits / mo | 9.13K | 3.05M |
| User Rating | 4.4 | 4.1 |
| Supported Platforms | Website | Website |

The control plane for trusted enterprise agents and models
See the performance of every agent and predictive model in a single pane of glass, with every action, token and dollar traceable by user and team.
Fiddler Centor Models power policy enforcement and continuous evaluation inside your network, avoiding external LLM API calls and their hidden costs.
Detects and redacts PII, PHI and secrets on the same request path — before a prompt reaches the model and before a response reaches the developer — with sub-80ms latency.
Keeps a living inventory of every connected agent and records each enforcement decision, with who triggered it and what happened, ready for GRC and AI regulation audits.

Privacy-first bot detection and fraud prevention for the web
Multi-layered detection delivers risk scores and near-zero false positives, with passive and no-CAPTCHA modes.
Stop transaction fraud, account takeovers and multi-accounting with privacy-preserving signals and no PII.
A stronger, toll-free alternative to SMS MFA that reduces fraud while simplifying the user experience.
Build custom risk models with adaptive learning and enrich your own ML using blinded, compliant signals.
Free / Open-sourceUnified observability, security and incident response for cloud-scale engineering teams
Free / Open-sourceUnified observability, security and incident response for cloud-scale engineering teams

SpecialistEnterprise AI and plagiarism detection for content integrity

SpecialistAI detector, plagiarism and content-quality checks in one scan
SpecialistAI detector, plagiarism and content-quality checks in one scan

Free / Open-sourceAgent observability, evaluation, and continuous improvement for production AI
Free / Open-sourceAgent observability, evaluation, and continuous improvement for production AI

Attack-led AI security testing and red teaming
Attack-led AI security testing and red teaming

SpecialistApplies AI behavior analysis to network and cloud security, but is designed for enterprise infrastructure rather than web forms.
SpecialistApplies AI behavior analysis to network and cloud security, but is designed for enterprise infrastructure rather than web forms.

Free / Open-sourceBuild, simulate, evaluate and monitor self-improving AI agents
Free / Open-sourceBuild, simulate, evaluate and monitor self-improving AI agents

Free / Open-sourceEvaluate, monitor, and govern your AI applications in production
Free / Open-sourceEvaluate, monitor, and govern your AI applications in production
SpecialistDelivers endpoint security and data erasure tools, but lacks web-based bot detection and challenge features.
SpecialistDelivers endpoint security and data erasure tools, but lacks web-based bot detection and challenge features.

SpecialistSpecializes in protecting AI models against prompt injection and jailbreaks, rather than standard web traffic bot defense.
SpecialistSpecializes in protecting AI models against prompt injection and jailbreaks, rather than standard web traffic bot defense.

Free / Open-sourceStandardize LLM evaluation, observability, and red teaming across your whole org
Free / Open-sourceStandardize LLM evaluation, observability, and red teaming across your whole org

SpecialistMonitors SaaS applications for data loss prevention, but does not offer public-facing bot mitigation or CAPTCHA widgets.
SpecialistMonitors SaaS applications for data loss prevention, but does not offer public-facing bot mitigation or CAPTCHA widgets.