Cap Worker

Protect your site from bots without tracking visitors

By xyTom

InstallOpens in your own Appflare
Stars
201
201 stars on the app's GitHub repository.
Installs
Under 10
Fewer than 10 Appflare users run this app, from anonymous usage data; smaller counts are not published.
Plan
Free
Runs on Cloudflare's free Workers plan.
License
MIT
An open-source license: you may use, change and share the app on its terms.
Version
Sep 15, 2025
Version 0.0.0-20250915.39eb690.
Last tested
Oct 14
The catalog installed this version in a test account and it answered, on Oct 14, 2026.

About

A self-hosted alternative to Google reCAPTCHA or hCaptcha.

A self-hosted backend for Cap, the privacy-friendly proof-of-work CAPTCHA: your sites get challenges and verify tokens against your own Worker, with no tracking.

Features

  • Add a CAPTCHA widget to your website forms
  • Check visitors with browser calculations instead of image puzzles
  • Verify completed challenges on your server
  • Collect no visitor tracking data
  • Prevent reuse of verified tokens by default

Deploy Cap Worker on Cloudflare

  1. Step 1: Set up Appflare in your Cloudflare account

    Once

    Appflare installs itself into your own Cloudflare account from your browser, and runs on the free Workers plan, as Cap Worker does. See what Cap Worker needs on your account.

    Set up AppflareAlready have Appflare? Install Cap Worker

  2. Step 2: Install Cap Worker

    Cap Worker needs no keys or settings from you.

    One switch on the form puts Cap Worker behind Cloudflare Access, so only the people who use your Appflare can open it.

  3. Step 3: Finish setting it up

    After the install, Appflare shows two short steps for Cap Worker, on its page.

With Appflare instead of by hand

  • Nothing to build on your computerAppflare sets itself up from your browser, with no API token to create and nothing to install.
  • Updates in one clickAppflare tells you when the catalog has a new version, and Update installs it.
  • Health checksAfter every install and update, Appflare checks that the app answers.
  • It stays in your own accountEverything runs on your Cloudflare account and your plan, and Appflare records what it creates, so an uninstall removes it.

What it needs on your account

  • Durable ObjectsThis app uses it

Questions

Does Cap Worker run on Cloudflare's free plan?

Yes. Cap Worker runs on Cloudflare's free Workers plan, and so does Appflare.

What does Cap Worker create in my Cloudflare account?

Appflare creates a Worker for Cap Worker and the resources it uses: Durable Object classes. Appflare records each resource it creates; an uninstall deletes them, keeping any data you choose to keep.

How do I update Cap Worker?

When the catalog has a new version, Cap Worker's page in Appflare says Update available. Select Update: Appflare takes a snapshot first, so you can roll back to the version before. You can also let Appflare update it automatically.

Is Cap Worker open source?

Yes, under MIT. An open-source license: you may use, change and share the app on its terms. Its source code is at github.com/xyTom/cap-worker.

Links

Packaged for the catalog by MendyLanda.

Author

Categories