What is SpamBlock?
Learn about SpamBlock's dual-product platform for spam prevention
SpamBlock is a privacy-focused form backend and spam detection service that protects web forms from spam submissions. It consists of two main products:
SpamBlock Pixel
The Pixel is a lightweight JavaScript script that you add to your website. It injects honeypot and assessment fields, analyzes submissions for spam signals, and adds marker data to the form payload. Send the full payload to your form backend (preferably SpamBlock Forms), where the backend uses the markers to filter spam.
Key features:
- One script tag, works immediately
- Works with any form
- No account required
- 13+ spam detection signals
- Free forever (1000 checks/day per IP)
Spam assessment markers (spamblock_score, spamblock_reasons, spamblock_allow) are automatically included in every submission. Your backend filters spam based on these markers—do not block submissions in the browser. This avoids false positives, prevents alerting fraudsters, and ensures all data is captured for analysis.
Hint: the lack of form assessment data would indicate that the form was submitted before the pixel could load, which is a strong indicator of a bot submission.
SpamBlock Forms
Forms is a simple, serverless form backend that lets you easily add custom forms to any website—no backend code needed. Just send form data to your unique endpoint, and Forms handles submissions, spam filtering, and notifications to your email, webhook, or other destinations.
Key features:
- Additional backend spam protection
- Analytics dashboard
- Webhook integrations
- Email notifications
- Data export
- Free for up to 100 submissions per month
How It Works Together
You can use Pixel and Forms together:
- Pixel provides protection to any form on any website, regardless of forms provider
- Forms provides an easy to use, easy to configure, secure hosted forms solution
- Both share the same spam detection engine