Connect your existing form to one endpoint. Save submissions in a searchable inbox, filter spam and check each notification’s delivery status.
Works with HTML, React, Next.js and Astro.
Free for 250 submissions a month. No credit card required.
Copy an example for your website and replace the endpoint with your own form’s URL.
<form action="https://api.formkoi.com/f/YOUR_PUBLIC_FORM_KEY" method="POST">
<label for="name">Your name</label>
<input id="name" name="name" autocomplete="name" required>
<label for="email">Email address</label>
<input id="email" name="email" type="email" autocomplete="email" required>
<label for="message">Your message</label>
<textarea id="message" name="message" required></textarea>
<!-- Leave this hidden anti-spam field empty. -->
<input type="text" name="botcheck"
tabindex="-1" autocomplete="off" style="display:none" hidden>
<button type="submit">Send message</button>
</form>How it works
Each recipient confirms their address by email before anything is sent to them.
Copy the endpoint, or a generated HTML, React, Next.js or Astro example that already includes your Turnstile and upload settings.
Send a test from the workspace, then submit from your real page. Open the message to see its fields, recipients and delivery status.
<form action="https://api.formkoi.com/f/YOUR_PUBLIC_FORM_KEY" method="POST">
<label for="name">Your name</label>
<input id="name" name="name" autocomplete="name" required>
<label for="email">Email address</label>
<input id="email" name="email" type="email" autocomplete="email" required>
<label for="message">Your message</label>
<textarea id="message" name="message" required></textarea>
<!-- Leave this hidden anti-spam field empty. -->
<input type="text" name="botcheck"
tabindex="-1" autocomplete="off" style="display:none" hidden>
<button type="submit">Send message</button>
</form>Replace the action URL with the endpoint from your workspace. The hidden honeypot field is the only extra markup; Turnstile and upload markup are generated when you enable them.
Using React, Next.js or Astro?What you get
Built for freelance developers, small studios and technical founders. Every site needs a contact or quote form; none of them needs its own mail setup, spam filter and retry logic.
01Inbox
Messages from all your sites and clients land in one place, tagged by form, so you never dig through email threads to find a lead.
02Delivery status
Check whether an email is queued, delivered to the receiving mail server or bounced. Review the attempt history and retry eligible failures from the saved submission.
Delivered means accepted by the receiving mail server. It does not confirm inbox placement or that the email was read.
Receipt versus delivery03Spam protection
Four layers of protection on every plan. Suspicious messages are held in a Spam folder with the reason shown, and a false positive is one click from restored.
Pricing
Free for 250 submissions a month, with spam protection and delivery tracking included. Need file uploads or more submissions? Pro includes private attachments and 10,000 monthly submissions, shared across your forms.
Pro: $12/month or $120/year — save $24 a year.
Pro billed as $120 once a year, instead of $144.
For portfolios, side projects and a client site or two.
$0forever
250 submissions a month
After that, new submissions pause until the month resets.
For higher-volume forms and file uploads.
$10per month, billed yearly
10,000 submissions a month
After that, $1.50 per 1,000 more, only if you turn extra usage on.
Create your free account without a card, then upgrade in Billing when you need Pro. Submissions are counted across all forms in a workspace and reset each month. Questions? Contact us.
Choose different fields and see which team would receive the message. This separate browser preview uses sample rules and recipients.
Browser-only demo with made-up recipients. Turnstile, attachments, webhooks and email sending are not simulated.
Quote requests, support forms and project briefs need extras. Switch each one on per form instead of wiring up another service.
On Pro: up to 3 private attachments per submission, 5 MiB each and 10 MiB total, with an expiry you choose.
Up to 10 rules on fields you already collect. First match wins, otherwise default recipients apply.
An automatic reply goes out only when the visitor ticks a consent box, with sending limits built in.
Signed webhook events in the Standard Webhooks format, with retries and an attempt history.
No. Keep your fields, styles and website. Point a standard HTML form at your Form Koi endpoint, or send JSON or multipart from JavaScript. Your workspace generates an example that already matches your form’s Turnstile and upload settings.
Yes. Form Koi accepts regular HTML form posts, JSON and multipart requests, so it fits static sites as well as framework apps. The quickstart includes HTML, React, Next.js and Astro examples, and the API reference covers custom integrations.
Combine Cloudflare Turnstile, a hidden honeypot field, rate limits and allowed origins. Messages that trip the honeypot or contain many links are held in a Spam folder without notifying anyone. You can review and restore them. No filter catches everything.
Each notification has its own status: Queued, Sending, Accepted by email service, Delivered to mail server, Bounced or Needs attention. You can retry eligible failures from the message page. A delivery status does not guarantee inbox placement or that someone read the email.
Usage is shared across the forms in a workspace and resets each calendar month. Free includes 250 submissions and stops there: the endpoint returns a 429 error with a clear message, and the visitor is asked to contact the website owner. Pro includes 10,000 and can keep collecting past that for $1.50 per 1,000 once you turn on extra usage and choose a monthly spending cap.
Same plan, same limits. Monthly is $12 billed each month and can be cancelled any time. Yearly is $120 billed once a year, which works out to 2 months free. You choose at checkout. Contact support if you need to change your billing cycle later.
Yes. Create scoped API tokens for your server, read messages with cursor pagination, and manage supported form settings through the REST API. The docs include copyable requests and a downloadable OpenAPI specification.
By default messages stay until you delete them. Per form, you can set automatic expiry from 1 to 365 days after receipt. Attachments have their own shorter lifetime that you choose when you enable uploads.