Prosopo

What is Prosopo?

Prosopo is a modern, privacy-first bot defense and AI agent trust management platform designed for SaaS providers, e-commerce, ticketing platforms, and fintechs. Built by Prosopo Ltd, it replaces black-box scoring and invasive user tracking with transparent, explainable bot detection and open-source CAPTCHA widgets.

Prosopo operates across two core tiers: Procaptcha (a lightweight, open-source form protection widget with an available self-hosted mode) and Prosopo Protect (an enterprise edge-based bot and AI agent management solution running on Cloudflare Workers or AWS Lambda@Edge). Every request evaluated by Prosopo receives a clear, human-readable verdict and exact technical reason (e.g., "Solver service detected" or "HTTP header fingerprint mismatch"), allowing security teams to audit every block without opening support tickets.

• Platform Focus: Privacy-first bot protection, AI agent trust management, open-source CAPTCHA (Procaptcha), edge application security, and explainable threat detection
• Developer / Entity: Prosopo Ltd
• Launch Year: 2021

Use Cases:

• Protecting website contact forms, user signups, and password reset endpoints from automated spam
• Blocking credential stuffing, brute-force attacks, and account takeover (ATO) across authentication endpoints
• Stopping scalper bots and inventory hoarding on high-demand ticketing and e-commerce checkout flows
• Defending APIs and SaaS platforms against aggressive price scraping, content theft, and free-tier trial abuse
• Orchestrating AI agent access by setting custom policies for authorized research agents versus unauthorized scraping bots

Technology:

• Edge execution architecture deployed via Cloudflare Workers or AWS Lambda@Edge without server installations
• Multi-layer detector suite evaluating device behavior, browser parameters, network reputation, and solver service signals
• Open-source client widget base (Procaptcha) supporting self-hosting and zero third-party tracking cookies
• Decision Machines rule engine and Catcher behavioral SDK delivering granular, auditable request logs

Target Users:

• Full-stack engineers, security architects, and CTOs seeking transparent, non-blackbox bot detection
• E-commerce retailers, ticketing platforms, and SaaS founders protecting APIs and sign-up flows
• Privacy-conscious enterprises requiring strict GDPR compliance and self-hostable CAPTCHA options

Corporate Entity: Operates as Prosopo Ltd / prosopo.io

Key features of Prosopo

Prosopo's key features are

• Explainable Block Reasons: Every blocked request includes exact technical detector logs (such as synthetic interaction timings or header mismatches) instead of opaque scores.
• Procaptcha Open-Source Widget: Privacy-preserving, cookie-free CAPTCHA widget with zero third-party ad tracking and open-source GitHub codebase.
• AI Agent Trust Orchestration: Granular Access Rules to allow, monitor, or block legitimate AI shopping agents while stopping malicious scrapers.
• Edge Serverless Deployment: Deploys directly on Cloudflare Workers or AWS Lambda@Edge for ultra-low latency execution.
• 14-Day Preview Mode: Analyzes site traffic and highlights detected threats for 14 days before enforcing live block actions.
• Self-Hosting & Data Sovereignty: Offers full self-hosting options and EU-only data processing to satisfy GDPR requirements.

Prosopo Pricing

Prosopo offers a freemium model for its Procaptcha form widget alongside flat-rate, unmetered monthly plans for site-wide Prosopo Protect deployments.

Procaptcha Free Tier:

• $0 / month
• Includes up to 10,000 monthly request verifications for forms, invisible CAPTCHA mode, and basic spam filtering

Procaptcha Professional:

• Starting from $39 / month
• Includes higher monthly request volumes, residential proxy detection, and advanced analytics

Prosopo Protect Enterprise:

• From $1,990 / month (unmetered traffic pricing per site; 15% discount for annual billing)
• Includes site-wide and API protection, Cloudflare/AWS edge setup, explainable logs, 14-day preview mode, and business-hours SLA

Prosopo Protect Custom:

• From $3,300 / month
• Includes everything in Enterprise plus 24/7 support with 15-minute P1 response SLA, custom data residency, and dedicated database options

Who is using Prosopo?

Prosopo is trusted by thousands of websites, digital platforms, and institutions globally, including

• Ticketing & E-Commerce Outlets: Twickets (UK ticket resale platform) and major retail portals
• Digital Media & Publishing: The A.V. Club, Jezebel, and PimEyes
• Enterprise & Academic Organizations: Persimmon Homes, University of Cologne, and American Astronomical Society

Best Prosopo Alternatives

Some of the strongest Prosopo alternatives include

• Cloudflare Turnstile
• hCaptcha
• Altcha (Open Source)
• Friendly Captcha
• DataDome
• Arkose Labs

Pros and Cons of Prosopo

Pros

• Pioneers explainable detection by providing specific technical reason strings for every blocked request
• Open-source, privacy-first Procaptcha widget requires no cookie consent banners
• Predictable flat-rate pricing for Prosopo Protect avoids traffic spike invoice surprises
• Serverless edge deployment (Cloudflare/AWS) ensures zero backend server maintenance

Cons

• Site-wide Prosopo Protect plans start at $1,990/month, targeted primarily at mid-market and enterprise budgets
• Requires edge runtime environment (Cloudflare Workers or AWS Lambda@Edge) for full Protect deployment
• Less brand recognition than traditional legacy services like Google reCAPTCHA

Why Choose Prosopo?

Prosopo is an ideal choice for developers, security teams, and enterprise leaders who want a transparent, privacy-focused bot management platform that provides clear, auditable reasons for every blocked request while supporting open-source CAPTCHA self-hosting.

• Replaces black-box scores with human-readable, auditable block reasons
• Offers an open-source, cookie-free CAPTCHA widget (Procaptcha)
• Provides flat-rate, unmetered edge protection against scrapers and scalpers
• Orchestrates trusted AI agents versus abusive bot traffic

Prosopo vs. Competitors

The main difference between Prosopo, DataDome, and Cloudflare Turnstile is that Prosopo provides 100% explainable technical block reasons for every detection alongside an open-source CAPTCHA option (Procaptcha), whereas DataDome uses proprietary ML risk scoring without open-source widgets, and Cloudflare Turnstile focuses on zero-puzzle background edge checks within Cloudflare's ecosystem. Prosopo stands out for its explainable logs, flat-rate unmetered pricing, and open-source base.

How do we rate Prosopo?

Prosopo Review

Prosopo is a breath of fresh air in the enterprise bot management space. By rejecting black-box scores in favor of explicit, human-readable detection reason strings for every blocked request, it gives security engineers total clarity on threat activity. Combined with its privacy-first open-source Procaptcha widget and edge-based Protect architecture, Prosopo is an ideal solution for modern, auditable web security.

Conclusion

Prosopo is an innovative, privacy-first bot mitigation and AI agent trust platform. By uniting open-source widget technology, explainable edge detection, and predictable flat-rate pricing, it empowers businesses to protect forms, APIs, and whole web applications with absolute confidence.