andersk/altcha

Analysis updated 2026-07-18 · repo last pushed 2025-06-03

Audience · developerComplexity · 3/5StaleSetup · moderate

Mindmap

mindmap
  root((ALTCHA))
    What it does
      Proof-of-work challenge
      Blocks spam and bots
      No tracking or cookies
    Tech Stack
      JavaScript widget
      TypeScript backend
      Python PHP Go Java Ruby Elixir
    Use Cases
      Signup form protection
      Donation form spam block
      API abuse prevention
    Audience
      Web developers
      Privacy conscious teams
    Features
      GDPR CCPA compliant
      WCAG accessible
      Lightweight 29KB

mindmap root((ALTCHA)) What it does Proof-of-work challenge Blocks spam and bots No tracking or cookies Tech Stack JavaScript widget TypeScript backend Python PHP Go Java Ruby Elixir Use Cases Signup form protection Donation form spam block API abuse prevention Audience Web developers Privacy conscious teams Features GDPR CCPA compliant WCAG accessible Lightweight 29KB

What do people build with it?

USE CASE 1

Replace a third-party CAPTCHA on a signup or contact form with a privacy-friendly, cookie-free alternative.

USE CASE 2

Add adaptive spam filtering to an API or donation form using ALTCHA Sentinel.

USE CASE 3

Protect a React, Vue, Svelte, or Angular app from bots using a ready-made starter template.

What is it built with?

JavaScriptTypeScriptPythonPHPGoJavaRubyElixir

How does it compare?

	andersk/altcha	00kaku/gallery-slider-block	04amanrajj/netwatch
Stars	—	—	0
Language	—	JavaScript	Rust
Last pushed	2025-06-03	2021-05-19	—
Maintenance	Stale	Dormant	—
Setup difficulty	moderate	easy	moderate
Complexity	3/5	2/5	3/5
Audience	developer	general	ops devops

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

Requires running your own backend verification server and embedding the widget script.

The explanation does not specify the license terms.

Copy-paste prompts

Prompt 1

Show me how to add the ALTCHA widget to a signup form in my React app so it verifies submissions without cookies.

Prompt 2

How do I set up an ALTCHA backend verification server using one of the TypeScript or Python libraries?

Prompt 3

Explain how ALTCHA's proof-of-work challenge works and why it doesn't need to track or fingerprint users.

Prompt 4

Help me add an accessible ALTCHA code-challenge fallback with audio playback to my form.

Frequently asked questions

What is altcha?

ALTCHA is a self-hosted, privacy-first spam and bot protection widget that uses an invisible proof-of-work puzzle instead of tracking cookies or visual CAPTCHAs.

Is altcha actively maintained?

Stale — no commits in 1-2 years (last push 2025-06-03).

What license does altcha use?

The explanation does not specify the license terms.

How hard is altcha to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is altcha for?

Mainly developer.

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