Procaptcha vs Friendly Captcha - Why Real Bot Protection Matters in 2026

Friendly Captcha markets itself as an invisible, privacy-first CAPTCHA built on proof of work. The privacy part is genuine: it is a European product, it processes in the EU, and it does not need third-party tracking cookies.

The bot protection is the problem. Proof of work is the whole mechanism, and proof of work does not stop bots — it prices them. We examined the integration directly when we first wrote this comparison in 2025, and what the client-side check actually did was considerably less than the marketing implied.

Proof of work is a price, not a test

Proof of work makes the client perform a computation before its request is accepted. The cost is negligible for one sign-up and adds up across a million attempts, so it is a real defence against bulk spam.

It establishes nothing about whether a person is present. Paying the cost is the protocol, so any operator willing to spend the CPU time passes — and at the scale where bot abuse is profitable, compute is the cheapest thing in the attacker's budget. Renting it costs less than the residential proxy access they are already buying.

That is the structural issue, and it is why a proof-of-work-only product behaves the way it does in practice:

• It stops opportunistic, high-volume form spam
• It does not stop anything aimed at you specifically — credential stuffing, scalping, card testing, scraping — because all of those will happily pay

What we found in their stack

From our own examination of the integration:

• The client-side check was thin. The protection delivered to the browser amounted to a user-agent inspection alongside the computation. A user-agent is a string the client chooses, so it is not a protection; it is a formality.
• Commercial solving services already supported it. Anti-Captcha and similar services advertised API support for clearing Friendly Captcha challenges, and without needing proxies — which is the clearest possible evidence that the challenge is not the obstacle.
• Browser automation passed. Selenium, Playwright and Puppeteer drive real browsers, so there was nothing in the check for them to fail. No behavioural analysis, no browser-coherence test, nothing that asks whether a human was there.
• The computation was charged to the user. Proof of work spends the visitor's CPU and, on a phone, their battery. A legitimate customer pays that cost on every verification, and an attacker pays it once per attempt and absorbs it.

The last point is the one that makes it a poor trade. The friction is real and falls on your customers, and the protection it buys is defeated for a few dollars per thousand.

How the two compare

The verdict-inspection row matters more than it looks. A pass or fail token cannot tell you why a customer was refused, which is the question you need answered when one complains. Forrester marked the sector down on explainability in its 2026 Wave, and it applies to most products in it.

Where Friendly Captcha is a reasonable choice

A comparison that concludes "buy ours" in every case is not a comparison:

• Opportunistic form spam is your whole threat model, and cost per attempt is enough to deal with it
• You want the simplest possible integration and no verdict tuning
• Your requirement is principally a GDPR-defensible CAPTCHA, and EU processing with no tracking cookies satisfies it

If that is your situation, proof of work on its own is a legitimate answer and you should keep it.

Where you need more than a price

• Targeted abuse. Credential stuffing, scalping and card testing are run by operators who will pay the compute.
• You need to know why. A per-signal verdict answers a blocked customer's question; a pass/fail token does not.
• Per-flow thresholds. Checkout and password reset need different treatment from a contact form.
• Agentic clients. An AI assistant acting for a real customer fails every classic bot test and is a paying user. Deciding that needs more inputs than a computation.

What customers have said

"We managed to greatly reduce the friction and churn rate of our users while getting better bot protection." — Damjan, Developer

More are on our reviews page, from G2 and Trustpilot.

Checking it yourself

Both products are free to trial, and your own traffic is the only test that settles anything. Put them in front of the same endpoint and compare what each lets through.

Whichever you choose, check three things: that the token is verified server-side, that it is single-use with a short expiry, and that you can find out why a given session was allowed or refused.