Bot defence built for the age of AI agents

We help businesses let in real people and trusted AI agents, and stop the bots that ruin things for both.

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The web now has three kinds of visitor

People, bots, and AI agents acting for real people. Block every agent and you lose customers; let them all through and you invite abuse. The Forrester Wave 2026 renamed the category from "bot management" to "bot and agent trust management". Prosopo started in 2021 as a privacy-first CAPTCHA and now covers all three, on forms, APIs and whole sites.

Most bot protection is invasive for users and expensive for the businesses paying for it. We are transparent instead: GDPR compliant, privacy-first, and open source.

The problems that keep teams up at night

AI SaaS and freemium apps

Stop fake sign-ups draining your API credits, while letting agents acting for paying customers through.

E-commerce and ticketing

Stop scalper bots, price scrapers and checkout automation, while welcoming AI shopping agents.

Content and publishers

Tell trusted crawlers and authorised AI agents apart from unwanted scraping, with a policy rather than all-or-nothing.

Open source and indie developers

A privacy-first CAPTCHA with full control and a free-forever tier.

Scaling SaaS teams

Trust decisions on every request, human, agent or bot, with the SLAs and reporting security teams need.

What we stand for

Agent-aware

Built for the trust-first model: granular agent permissions and behavioural checks, not a binary block or allow.

Privacy-first

Minimal data collection, no third-party tracking, no data sales. GDPR compliant by design.

Open source

Transparent and auditable, developed in the open on GitHub.

Fair pricing

Published prices from $39 a month, a free-forever tier and no hidden fees.

websites protected: 1,000+
verifications a month: 1B+
bots stopped a month: 100M+

What customers say

Verified G2 and Trustpilot reviews, in their own words.

Easy setup for website owners I have been a web developer for over 10 years at this point, some of the alternative captcha's have been a bit long winded to setup and their documentation is quite poor. I managed to go from discovering Prosopo and use it on my website (the upcoming visitgrid.uk) in under an hour in my own weird in house architecture. Daniel Jones · 22 Jul 2026 Easy Setup, Excellent Spam Protection I use Procaptcha to eliminate spam from my forms on my website. It was fairly easy to install and has excellent customer service. When installed correctly, it helped eliminate spam contacts and subscribers. I contacted Chris at Procaptcha for assistance with an issue, and he very quickly helped resolve it. Wanda A · 28 Mar 2026 Stopped Newsletter Spam My newsletter signup was being continuously spammed. Chris helped me tweak the settings so that bots blocked and temporary spam email domains were filtered. Excellent product and team! Frank Power · 16 Mar 2026 Effortless Integration and Outstanding Support with Procaptcha I use Procaptcha with React. Procaptcha has been very easy to implement as they maintain a wrapper component that can be easily pulled from NPM. They have incredible customer service and are happy to answer any questions I have or help their community with their product. The component itself is flexible, allows styling with inline CSS, and even allows for theming. The puzzle is also not too difficult to solve and is a great middle ground as far as Captchas go. I originally came from using Cloudflare Turnstile and hCaptcha and have enjoyed my experience with Procaptcha significantly more. Nathan G · 11 Aug 2025 Prosopo's CAPTCHA widget I've installed Prosopo's CAPTCHA widget on my website to filter out spam from my contact form. Getting it working was a little bit tricky but the support from Chris has been first class. I wanted to use a CAPTCHA which was as easy as possible for my website's visitors while respecting their privacy and which didn't use cookies. Prosopo's CAPTCHA meets all these criteria. Update - after more than a week I haven't had a single spam form submission. Theo · 31 Mar 2025 Easy Integration, First-Class Bot Blocking I like that Procaptcha offers easy integration, which meant we didn't have to spend days getting it set up. It's cost-effective and reasonable, which is great for our budget. The bot blocking feature is first-class, effectively preventing scrapers from registering as users and clogging up our workflow. Joshua G · 30 Jan 2026

See what's reaching your site

A Bot Exposure Assessment is a 30-minute call with an engineer. We look at your traffic, show where your current setup leaves gaps, and agree how a trial would be judged. Nothing to install first.

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