contact form API | real monthly bill, caps, overage, add-ons

Try it freeFull version · $21 →

How it works
  1. Enter your details in the free version below.
  2. See your result right away on this page.
  3. Need more? The full version adds what is listed under "What you get".

What you get: The Excel workbook that runs your volume through 4 named services at once (Formspree, Forminit, Static Forms, Basin, plan terms read 2026-11-15, yearly-billed rates) and names the cheapest plan that…

The plan card is not the bill: Formspree's card shows $20/mo billed yearly and charges $30 month to month for 2,000 submissions, and Forminit pauses and rejects every submission over the cap. 7 inputs and 12 formulas.

Made-up example: a plan card that says $20 a month bills $30 month to month for 2,000 submissions, so a site with 2,600 submissions a month has 600 rejected and pays $120 a year too much above the card.

Pricing pages put the yearly-billed rate on the card and the cap rule in the FAQ. This page puts both into one bill from your own volume, before a cap rejects an enquiry.

Your numbers

Your result

Submissions over the plan cap-
Submissions rejected over the cap-
Overage billed-
Real monthly bill-
Real bill minus the plan card price-
Real cost per 1,000 delivered submissions-
Paid above the plan card in a year-

Everything updates as you type. Nothing is uploaded. This runs in your browser.

Plan terms read on the vendors' own pages on 2026-11-15: Formspree Professional $20/mo billed yearly, $30 month to month, 2,000 submissions (formspree.io/plans) · Forminit: over the cap "forms pause and reject new submissions" (forminit.com/pricing) · Basin: over the cap submissions "will still be delivered" and billed, $5.25 per 1,000 for the first band (usebasin.com/pricing) · Static Forms Pro: $1.00 per 1,000 extra, off by default (staticforms.dev/pricing).

Full version — $21 once: the workbook runs your volume through Formspree, Forminit, Static Forms and Basin and names the cheapest plan that takes every submission. Get the workbook

Get the full calculatorFull version: all tabs, your own file, works offline.

Get the full version $21

The Excel workbook that runs your volume through 4 named services at once (Formspree, Forminit, Static Forms, Basin, plan terms read 2026-11-15, yearly-billed rates) and names the cheapest plan that takes every submission, so you can re-check next month when your volume or their prices change.

One payment, one licence key for this tool. The key is shown right after payment.

Plan cards read 2026-11-15: Formspree Professional $20/mo billed yearly or $30 month to month for 2,000 submissions (formspree.io/plans); Basin Pro $40.83/mo billed yearly for 5,000 plus $5.25 per 1,000 extra (usebasin.com/pricing

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Questions and answers

What does this page do?

The plan card is not the bill: Formspree's card shows $20/mo billed yearly and charges $30 month to month for 2,000 submissions, and Forminit pauses and rejects every submission over the cap.

Is it free?

Yes. The free version on this page works without an account. The full version ($21) adds: The Excel workbook that runs your volume through 4 named services at once (Formspree, Forminit, Static Forms, Basin, plan terms read 2026-11-15, yearly-billed rates) and names the cheapest plan that…

How do I use it?

1. Enter your details in the free version below. 2. See your result right away on this page. 3. Need more? The full version adds what is listed under "What you get".

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For a team or company: for an invoice with your company details, a quote or several licences, write to [email protected].