Category: Captcha & Bot Detection
8 European alternatives to CaptchaService (Stad München) — GDPR-compliant & EU-hosted.
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.
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Facts
- Headquarters
- DE (EU)
- Sovereignty model
- Open-source, distributed
- Category
- Captcha & Bot Detection
- Type
- Product
- GDPR-compliant
- Yes
- Open-source
- Yes
- Data hosting
- EU
Sources
Public sources used in the latest check of this record.
Compliance evidence
The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".
No public compliance evidence has been recorded for this vendor yet. Do you know its DPA or subprocessor list? Something wrong? Suggest a correction
Sovereignty profile of CaptchaService (Stad München)
How this vendor scores on the five dimensions of the Digital Sovereignty Heatmap: 0 is sovereign, 100 is high exposure. These are the same scores the assessment uses.
| Jurisdictional exposure (JES) | Headquartered in the EU: European law applies | 0 |
|---|---|---|
| Data residency (DRS) | EU-only hosting | 0 |
| Cryptographic key sovereignty (CKS) | Self-hostable: encryption keys under your own control | 10 |
| Platform lock-in (PLS) | Open source: low switching costs | 20 |
| Source & runtime sovereignty (SRS) | Source code auditable, forkable and self-hostable | 0 |
| Average | 6 |
Why digital sovereignty matters with CaptchaService (Stad München)
CaptchaService (Stad München) is headquartered in DE and therefore falls under European law: the GDPR, NIS2 and the Data Act. No foreign legislation can compel access to your data.
Data is hosted exclusively in the EU, so CaptchaService (Stad München) scores best on data residency.
CaptchaService (Stad München) is open source. You can audit the source code, self-host the software and keep the encryption keys under your own control. Switching is easier because data and software are not tied to a single party.
What this means for your organisation depends on your whole stack and context. The free assessment weighs CaptchaService (Stad München) together with your other vendors and gives a total score, a heatmap and the main risk drivers.
Top EU-based & GDPR-compliant alternatives to CaptchaService (Stad München)
The European alternatives to CaptchaService (Stad München) come from our knowledge base of over 3,600 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.
- ALTCHA Sentinel↗
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.
CZ · commercial
- Captcha.eu↗
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.
AT · commercial
- Gregwar Captcha Bundle↗
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.
FR · open-source
Frequently asked questions
What is the best European alternative to CaptchaService (Stad München)?
It depends on your use case. Strong EU alternatives to CaptchaService (Stad München) include ALTCHA, ALTCHA Sentinel and Atmosvere. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.
Are there open-source alternatives to CaptchaService (Stad München)?
Yes. Open-source EU alternatives to CaptchaService (Stad München) include ALTCHA and Gregwar Captcha Bundle. These keep your data fully under your own control and let you self-host if you want to.
Is CaptchaService (Stad München) GDPR-compliant and where is the data hosted?
CaptchaService (Stad München) is headquartered in DE (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes CaptchaService (Stad München) an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.
Digital sovereignty in Captcha & Bot Detection
Captcha & Bot Detection: Services that detect whether a real user or bot is visiting a website. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.
Also in this category
- mosparoEUCH
- Myra EU CAPTCHAEUDE
- Private CaptchaEUEE
- SilentShieldEUDE
- TrustcaptchaEUDE
- Akamai Bot ManagerUS
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