reCAPTCHA alternatives

2 projects to consider for your reCAPTCHA workflows.

2 open source

Explore Cap and Procaptcha. Each takes a different approach to your reCAPTCHA workflows. Read its capabilities and limitations to find the right fit.

Catalogue facts checked October 3, 2026

New

Cap

Self-hosted CAPTCHA that verifies visitors without puzzles

Open sourceApache-2.0Self-hosted

Cap suits small-to-mid product and engineering teams that self-host their stack and want to drop reCAPTCHA's tracking for a private, invisible check. Its strength is the combination of SHA-256 proof-of-work with server-side validation and instrumentation challenges, delivered through a roughly 20 kB cookie-free widget with a reCAPTCHA-compatible verify endpoint for migration. The material constraint is operational: there is no generally available hosted version, since Cap.js Cloud remains a waitlisted private beta, so somebody on the team must run the Docker or Node server. If the team can self-host, Cap is a strong privacy-first choice; if it needs zero-operations managed protection, it should use the CAPTCHA bundled with its auth or hosting platform instead.[1][2][3]

Good fit. Privacy-regulated teams replacing reCAPTCHA get an Apache-2.0 codebase with no cookies, no cross-site profiling, and verification data that never leaves their own servers.[1][2]

Keep in mind. Teams with nobody to run a server should not adopt infrastructure they cannot operate; with Cap.js Cloud still in private beta, there is no managed fallback today.[1]

Repository review signals: unknown status, very stale · Observed October 3, 2026.

Read project review Official website

Sources and editorial review

Source research. Reviewed on October 9, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.

We have not run or tested this product.

Indirect public reception sample only: repository stars and forks, AlternativeTo listing rank and likes, named production sponsors, and Logto v1.44.0 provider adoption. No original Reddit or G2 user reports were located within budget, so no verbatim testimonials are included. Adoption proxies are not satisfaction scores. No independent measurements of bypass rates, solve latency, or accessibility outcomes were found. A further search beyond the research budget might locate user reports.

Cap homepage
official · Observed October 9, 2026
Official homepage: mechanism, privacy posture, footprint, deploy shapes, managed-cloud beta state, production sponsors, roadmap.
Cap quickstart guide
official · Observed October 9, 2026
Official quickstart: npm packages, createServer config, Express middleware, standalone Docker image, challenge modes, token expiry.
tiagozip/cap repository
official · Observed October 9, 2026
Repository README: stars and forks, Apache-2.0 license, invisible PoW plus WASM puzzles, widget and image sizes, sponsors.
Cap effectiveness guide (fork mirror of official docs)
community · Observed October 9, 2026
Unofficial fork mirror of the official effectiveness guide; project-authored economic reasoning, not an independent measurement.
AlternativeTo Cap page
community · Observed October 9, 2026
Third-party listing: free and open-source, top-10 reCAPTCHA alternative with 28 likes at observation; like count is a reception signal, not a satisfaction score.
Logto v1.44.0 release notes
official · Observed October 9, 2026
Logto v1.44.0 release notes from early October 2026: Cap joins the supported CAPTCHA providers; OSS self-hosters run their own instance.

Procaptcha

Privacy-focused CAPTCHA that replaces reCAPTCHA and hCaptcha

Open sourceApache-2.0Self-hostedManaged hosting

Teams that want bot protection without tracking cookies or consent-banner changes will get the most from Procaptcha. Its drop-in widget with a same-shape verification response, invisible frictionless passes with a slider-puzzle fallback, and Docker self-hosting or managed cloud with 10,000 free monthly verifications cover the everyday form-spam need with little integration work. Teams that need documented SSO, offline verification, or published per-month Professional pricing should confirm those points before committing, and buyers who require independent public reviews should weigh the thin third-party record. If you run web forms and can change a verification URL, start with the free cloud tier; if you must keep every check on your own servers, self-host the Apache-2.0 packages instead.[1][2][3]

Good fit. The same-shape verification response keeps the migration to a URL change, and the product page speaks directly to repricing-driven moves off reCAPTCHA and hCaptcha.[1][2]

Keep in mind. The Enterprise plan lists multi-user team access but no SSO statement, so identity-conscious buyers should confirm support before committing.[1]

Repository review signals: unknown status, stale · Observed October 12, 2026.

Read project review Official website

Sources and editorial review

Source research. Reviewed on October 12, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.

We have not run or tested this product.

prosopo/captcha repository
official · Observed October 12, 2026
Official repository: prosopo/captcha open-source frictionless CAPTCHA and bot defense, 302 stars, Apache-2.0, prosopo.io homepage link, drop-replacement README, self-hosting guide with Docker Compose, WordPress plugin, Cloudflare Workers and AWS Lambda@Edge support.
Procaptcha GDPR-compliant CAPTCHA widget
official · Observed October 12, 2026
Official product page: drop-in CAPTCHA widget replacing reCAPTCHA or hCaptcha, same-shape verification response, GDPR-compliant cookieless default, free 10,000 monthly verifications, frictionless passes with slider-puzzle fallback, migration notes, comparison guides, support channel.
Prosopo pricing
official · Observed October 12, 2026
Official pricing: free Basic with 10,000 monthly requests, Professional with risk scores, device-aware detection, IP rules, spam filter, agent trust and 50 sites with 30-day trial, Enterprise with unlimited volume, team access, admin API, audit logs, custom SLA, 1:1 support.

Compare reCAPTCHA alternatives

Known catalogue facts at a glance. Columns with no reviewed values are omitted. “Not reviewed” means unknown, not that a capability is absent.

Known facts for reCAPTCHA alternatives
Project	License policy	Hosting	Deployment	Offline	Enterprise support	Best fit
Cap	Apache-2.0 · OSI-approved	Self-hosted	easy	No	Not reviewed	Protecting website forms and logins from bots; Replacing reCAPTCHA without third-party tracking
Procaptcha	Apache-2.0 · OSI-approved	Self-hosted + Managed	moderate	Not reviewed	Yes	Site teams migrating contact and support forms off reCAPTCHA or hCaptcha; Operators wanting GDPR-compliant bot checks without cookie-banner changes

Before you switch

Check that the project covers the workflows and data you need to move.
Confirm that the license terms fit how you plan to run, modify, and distribute it.
Choose between self-hosting responsibility and a reviewed managed option.
Open the project page for repository freshness, review dates, and any unresolved requirements.

About reCAPTCHA

reCAPTCHA is Google’s hosted service for assessing automated traffic and applying bot protection to websites and applications.

Integrations use assessments and challenges depending on the selected configuration. Pricing and feature availability vary by tier, with a limited free assessment allowance rather than unlimited free use.

Google · Free Essentials allowance up to 10,000 assessments per organization/month; higher usage and advanced tiers incur charges. Observed October 2, 2026. · Checked October 3, 2026

Official website

How this list is ordered

Recommended · Organic catalogue order.

A deterministic editorial score using relationship confidence, category fit, logarithmic popularity, as-of maintenance and freshness, with bounded anomaly quarantine and known-data penalties. Payment is fixed at zero.

Payment does not affect organic ranking. Order is a starting point, not a universal recommendation.

OpenAlternative organic alternatives v4 · version 4