14 European Captcha & Bot Detection vendors.
Captcha & Bot Detection: Services that detect whether a real user or bot is visiting a website. Below, every vendor in the knowledge base headquartered in the EU or the EEA, each checked by us for headquarters, owner, hosting and licence. Non-European vendors are listed at the bottom with a link to their European alternatives.
28 vendors in total: 14 European, 10 American, 4 other; 6 open source. Last checked: 4 October 2026.
Why this matters for digital sovereignty
Captcha and bot-detection services collect behavioural and device data from every visitor, which qualifies as personal data under the GDPR and makes transfers to non-EU servers relevant. Check whether an EU processing option exists, how long fingerprint data is retained and whether a privacy-friendly alternative without tracking is available.
European vendors
- ALTCHASelf-hosted / open source
Czech open-source proof-of-work captcha alternative
Czechia · open-source
- ALTCHA SentinelEU sovereign
Self-hostable enterprise backend on top of the open-source ALTCHA, adding machine-learning classification, fraud detection and rate-limiting within your own Docker/Kubernetes clusters. Developed by BAU Software s.r.o. (Brno, Czech Republic) — the same maker as the base ALTCHA project.
Czechia
- AtmosvereEU sovereign
Austrian (Dornbirn) enterprise fraud-prevention and bot-mitigation solution at CDN level, formerly Trusted Accounts.
Austria
- Captcha.euEU sovereign
Proof-of-work based, cookieless CAPTCHA alternative operated by Captcha GmbH (Vienna, Austria, registered at Handelsgericht Wien), hosted entirely in Austria, with active customers including OBB and Bauer Media Group as of 2026.
Austria
- CaptchaFoxEU sovereign
German privacy-focused captcha solution
Germany
- CaptchaService (Stad München)Self-hosted / open source
Open-source framework by the City of Munich's IT department (it-at-m) wrapping ALTCHA in a secure, multi-tenant Spring Boot microservice for government portals.
Germany · open-source
- DataDomeEU sovereign
French enterprise bot detection with the DataDome Slider (a CAPTCHA alternative) and machine learning processing 5+ trillion signals daily.
France
- Friendly CaptchaEU sovereign
German privacy-friendly proof-of-work captcha service
Germany
- Gregwar Captcha BundleSelf-hosted / open source
Widely-used, open-source web-rendering library (Symfony bundle) that generates inline image captchas on your own application server. Created by Grégoire Passault (Bordeaux, France); no controlling company.
France · open-source
- mosparoSelf-hosted / open source
Open-source alternative to traditional captchas that checks form data in real time for suspicious patterns and spam traits, without tracking or external API calls. Maintained by the non-profit mosparo Association (Mellingen, Switzerland).
Switzerland · open-source
- Myra EU CAPTCHAEU sovereign
GDPR-compliant, cookieless bot-protection CAPTCHA product from Myra Security GmbH, a Munich-based, ISO 27001/BSI C5/PCI DSS certified German security vendor, marketed explicitly as independent from US CLOUD Act/FISA 702 jurisdiction.
Germany
- Private CaptchaEU sovereign
Privacy-first CAPTCHA/bot-protection service made and hosted in the EU, built by Estonian company Intmaker OU, offering EU-only endpoints, no cookies/tracking, and a self-hosting option for full data control.
Estonia
- SilentShieldEU sovereign
German invisible, cookieless GDPR-compliant CAPTCHA, EU-hosted.
Germany
- TrustcaptchaEU sovereign
German GDPR-compliant captcha service
Germany
Non-European vendors in this category
For each vendor, the page with European alternatives and the sovereignty profile.
- Non-EU vendorAkamai Bot ManagerUnited States · 8 EU alternatives
- Non-EU vendorArkose LabsUnited States · 8 EU alternatives
- Non-EU vendorCloudflare TurnstileUnited States · 8 EU alternatives
- Non-EU vendorF5 Distributed Cloud Bot DefenseUnited States · 8 EU alternatives
- Non-EU vendorFastly Bot DetectionUnited States · 8 EU alternatives
- Non-EU vendorGeeTest CAPTCHAChina · 8 EU alternatives
- Non-EU vendorGoogle reCAPTCHAUnited States · 8 EU alternatives
- Non-EU vendorhCaptchaUnited States · 8 EU alternatives
- Non-EU vendorHUMAN Security (PerimeterX)United States · 8 EU alternatives
- Non-EU vendorKasadaUnited States · 8 EU alternatives
- Self-hosted / open sourcemCaptchaIndia · 8 EU alternatives
- Non-EU vendorMTCaptchaUnited States · 8 EU alternatives
- Non-EU vendorRadware Bot ManagerIsrael · 8 EU alternatives
- Non-EU vendorSwetrix CAPTCHAUnited Kingdom · 8 EU alternatives
Frequently asked questions
Which European Captcha & Bot Detection vendors are there?
The knowledge base lists 14 European Captcha & Bot Detection vendors, including ALTCHA, ALTCHA Sentinel, Atmosvere and Captcha.eu. Every record is checked for headquarters, ultimate owner, hosting locations and licence.
Are there open-source options for Captcha & Bot Detection?
Yes. Open-source Captcha & Bot Detection software from Europe includes ALTCHA, CaptchaService (Stad München), Gregwar Captcha Bundle and mosparo; you can self-host it with the encryption keys under your own control.