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Disclaimer: Star Stack provides information about European technology services for educational purposes only. Service listings, sovereignty assessments, and recommendations do not constitute legal, financial, or professional advice. We encourage you to verify all information independently and consult appropriate professionals before making technology decisions. Star Stack is not affiliated with any listed services unless explicitly stated.

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Altcha | Star Stack

Services
Altcha

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Altcha

Name: Altcha
Author: Star Stack

Self-hosted, privacy-first CAPTCHA and bot protection

Visit Website GitHub 2.8K

About

ALTCHA is a self-hosted CAPTCHA and bot protection service that uses proof-of-work mechanisms to verify users without external tracking. It is designed for organizations requiring GDPR compliance and accessibility standards without relying on third-party servers.

Resources

No migration guide is currently listed for this service.

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Sovereignty Score

Recorded assessment version: jurisdiction-ownership-2026-10-04

out of 100

Data completeness50% (Partial)

Jurisdictional(56%)

100

Excellent jurisdictional protection with EU-only legal exposure

Jurisdiction: Czechia (EU member)
No foreign parent provider

Ownership(44%)

Strong EU ownership and control

Bootstrapped (self-funded)
Bootstrapped stage
Low acquisition risk (bootstrapped, no investor pressure) (No VC exit timeline, founders retain full control)

More dimensions coming soon

GovernanceComing soon

PortabilityComing soon

LicenseComing soon

CommunityComing soon

How missing data affects scores Submit data corrections

Provider

BAU Software s.r.o.

Quick Facts

Legal jurisdiction: Czechia, EU
Headquarters: Czechia, EU
Ownership: Bootstrapped
License: MIT
Deployment: SaaS

Evidence and freshness

Verification date unknown. This assessment needs review.

A score is an assessment of recorded facts. Missing evidence and unresolved ownership can affect the result.

hqCountry: other
Retrieved 30/01/2026, confidence 75%.
Read evidence excerpt
ALTCHA is made in Europe. ALTCHA ® is a trademark registered in EU.
hqCountry: other
Retrieved 30/01/2026, confidence 75%.
Read evidence excerpt
ALTCHA is made in Europe. ALTCHA ® is a trademark registered in EU.
license: github
Retrieved 02/02/2026, confidence 90%.
Read evidence excerpt
MIT License
hasSelfHostOption: official website
Retrieved 02/02/2026, confidence 90%.
Read evidence excerpt
Self-Hosted ALTCHA Sentinel - deploy on-premises with no dependency on third-party services
hasSaasOffering: official website
Retrieved 02/02/2026, confidence 90%.
Read evidence excerpt
Managed ALTCHA Sentinel - fully managed cluster operated by ALTCHA's engineering team
name: official website
Retrieved 02/02/2026, confidence 90%.
Read evidence excerpt
BAU Software s.r.o., IČO: CZ19414480
hqCountry: official website
Retrieved 02/02/2026, confidence 90%.
Read evidence excerpt
Lidická 700/19, Brno 602 00, Czechia
hqCity: official website
Retrieved 02/02/2026, confidence 90%.
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Lidická 700/19, Brno 602 00, Czechia
legalForm: official website
Retrieved 02/02/2026, confidence 90%.
Read evidence excerpt
BAU Software s.r.o. (společnost s ručením omezeným - Czech limited liability company)
ownershipType: official website
Retrieved 02/02/2026, confidence 90%.
Read evidence excerpt
No external funding or investors mentioned. Company operated by founder Daniel Regeci