It filters the spam so your inbox does not have to. Basin is a form backend: you point an HTML form at a Basin endpoint and it stores submissions, filters spam and passes them on by email and integrations. The Free plan lists 1 form, 50 submissions a month, 1 project, no file uploads, 30 days of data retention, basic spam protection, AJAX support and Zapier. Starter is listed at $12.50 a month for 3 forms and 250 submissions, Growth at $24.17 for unlimited forms and 1K submissions, Pro at $40.83 for 5K, and Agency at $108.33 for 25K. G2 has only 1 review. On Reddit, a r/webflow commenter called Basin awesome and said its spam filtering works wonders, and a Webflow forms review scored Basin 7.6 out of 10 for notifications against 6.8 for Formspark. It suits developers who want a form endpoint with decent spam control and can live with a small free tier.
Free tier quotas
Plan
Free, $0
Forms
1
Submissions
50 per month
Projects
1
File uploads
None
Collaborators
None
Data retention
30 days
Spam protection
Basic
Integrations
Zapier, with AJAX support
Last sniffed Oct 11, 2026. Always confirm on the official pricing page.
👍 Good boy
+The Free plan includes AJAX support, basic spam protection and a Zapier integration.
+A r/webflow commenter called Basin awesome and said its spam filtering works wonders.
+A r/webflow review of Webflow's default forms scored Basin 7.6 out of 10 for notifications, ahead of Formspark at 6.8, and said it works well with Zapier.
+Growth at $24.17 a month lists unlimited forms, projects, collaborators and data retention, with Slack and Google Sheets integrations.
+Pro adds custom email templates, an AI lead agent and location filtering.
+Agency lists enhanced deliverability, priority support and multi-step forms at 25K submissions a month.
👎 Watch out
−Free allows only 1 form and 50 submissions a month, with no file uploads and no collaborators.
−Free keeps submission data for only 30 days.
−Slack and Google Sheets integrations are first listed on Growth, not on Free or Starter.
−G2 shows only 1 review for Basin, so there is little independent review data.
−Agency, the top listed plan, costs $108.33 a month.
−Starter lists 3 forms and no collaborators at $12.50 a month.
The catch
The Free plan is a trial-sized plan: 1 form, 50 submissions a month and 30 days of data retention. Starter, Growth, Pro and Agency are the paid steps.
In the pricing data I read, the monthly and annual price fields were identical for every paid plan (for example $12.50 for Starter), so I could not tell whether those figures are monthly prices or an annual rate shown per month. The page title also advertises a free trial. Check the live page before you rely on any number.
Review data is thin. G2 has 1 review, and most opinion comes from Reddit threads about Webflow forms. One commenter credited Basin's spam filtering. I did not verify how the filtering works.
What’s included
✓Hosted form endpoint
✓AJAX support
✓Basic spam protection on Free
✓Advanced spam filtering on Growth
✓Zapier integration
✓Slack and Google Sheets integrations on Growth
✓Data retention up to unlimited
✓Custom email templates on Pro
✓Multi-step form support on Agency
Free tier value
Generosity
B
Estimated value
$12.50/mo (Starter plan)
Feature parity
Free: 1 form, 50 submissions, 30-day retention. Starter is $12.50 a month.
Screenshots
HomepagePricing page
Paid plans
Starter, listed at $12.50 per month
3 forms, 250 submissions a month, 500MB file storage, 1 project, 365 days of data retention, basic spam filtering and Zapier.
Growth, listed at $24.17 per month
Unlimited forms, projects and collaborators, 1K submissions a month, 2GB file storage, unlimited data retention, advanced spam filtering, Slack and Google Sheets integrations.
Pro, listed at $40.83 per month
5K submissions a month, 10GB file storage, custom email templates, an AI lead agent and location filtering.
Agency, listed at $108.33 per month
25K submissions a month, 50GB file storage, enhanced deliverability, priority support and multi-step forms support.
Common questions
Is Basin free?
Yes. The Free plan lists 1 form and 50 submissions a month.
