Form backend as a service

Stop building form backends. Start shipping.

Point your HTML form to InputHaven and get instant submissions, email notifications, AI spam filtering, and a full dashboard. No server code. Works with every framework.

Start Free — 500 submissions/month Read the Docs

No credit card required. Free tier is free forever.

Add to any HTML form in 30 seconds

One hidden field. That's the entire integration. Pick your framework:

<form action="https://inputhaven.com/api/v1/submit" method="POST">
  <input type="hidden" name="_form_id" value="your-form-id" />
  <input type="text" name="name" placeholder="Name" required />
  <input type="email" name="email" placeholder="Email" required />
  <textarea name="message" placeholder="Message" required></textarea>
  <button type="submit">Send</button>
</form>

HTMLReactNext.jsVueSvelteAstroRemixNuxtAngularGatsbyHugoJekyll

500+

Free submissions/month

5 layers

Spam protection

12+

Frameworks supported

80%

Cheaper than Formspree

Everything you need for form handling

From simple contact forms to complex multi-step workflows.

Instant Setup

Create a form endpoint in seconds. No server, no deployment, no configuration files. Just a URL.

Email Notifications

Get notified instantly when someone submits your form. Custom subjects, auto-responses, and HTML formatting.

AI Spam Filtering

Claude-powered spam detection that understands context, not just keywords. Blocks sophisticated spam that rule-based filters miss.

Conditional Email Routing

Route submissions to different team members based on field values. Sales inquiries to sales, support to support.

Visual Form Builder

Build forms visually and export production-ready HTML, React, or Next.js code. Copy, paste, done.

Multi-Layer Spam Protection

Honeypot fields, keyword filtering, AI detection, rate limiting, and domain allowlists. Five layers of defense.

Webhooks

Forward submissions to Slack, Discord, Zapier, or your own backend. HMAC-SHA256 signed for security.

File Uploads

Accept file uploads with submissions. Stored securely on Cloudflare R2 with signed download URLs.

Works Everywhere

HTML forms, React, Vue, Svelte, Next.js, Astro, Angular — if it can make an HTTP request, it works.

Submissions Dashboard

View, search, filter, and manage all submissions. See spam scores, read status, and submission metadata.

CORS & Domain Control

Per-form domain allowlists ensure submissions only come from your authorized websites.

CSV Export & API

Export submissions as CSV. Full REST API for programmatic access. Available on all plans including free.

How it works

Create a form

Add one line of HTML

Add a hidden input with your form ID. Point your form action to our API. That's it.

Receive submissions

Get email notifications, view submissions in the dashboard, forward via webhooks.

Try it right now

This form is powered by InputHaven. Fill it out and see how submissions work.

More submissions. Less money. Better features.

See how InputHaven compares to other form backends.

Feature	InputHaven	Formspree	Web3Forms	Getform
Free submissions/mo	500	50	250	50
Price for 2,500 subs	$5/mo	$25/mo	$8/mo	$16/mo
API on free tier	Yes	No	Yes	No
AI spam filtering	Yes	No	No	No
Email routing rules	Yes	No	No	No
Visual form builder	Yes	No	No	Yes
Webhooks	From $5/mo	From $25/mo	No	From $16/mo
File uploads	From $5/mo	From $25/mo	From $8/mo	From $16/mo
Open API spec	Yes	No	No	No

InputHaven vs Formspree InputHaven vs Getform

Simple, transparent pricing

Start free. Upgrade when you need more. Cancel anytime.

Free

500 submissions/month
3 forms
Email notifications
Spam protection
API access

Start Free

Starter

$5/mo

$48/yr (save $12)

2,500 submissions/month
25 forms
File uploads
Webhooks
Data export (CSV)
AI spam filtering
Conditional email routing
90-day retention

Get Started

Built for every use case

Contact Forms

The classic use case. Add a contact form to your marketing site in under a minute.

Feedback Widgets

Collect user feedback from your app. Use the JSON API for seamless integration.

Newsletter Signups

Collect email addresses and forward to your email marketing tool via webhooks.

Job Applications

Accept resumes and cover letters with file uploads. Route to the right hiring manager.

Event Registration

Registration forms with conditional routing. Sales team to sales, technical to engineering.

Lead Generation

Capture leads from landing pages. Auto-respond instantly. Forward to your CRM via webhook.

Developer-first design

Everything a developer expects from a form backend.

REST API on every plan

Programmatic access to forms and submissions, even on the free tier. No upgrade required.

OpenAPI specification

Full API spec at /openapi.yaml. Generate typed clients in any language.

npm packages

@inputhaven/react for React apps, @inputhaven/js for vanilla JavaScript. Type-safe.

HMAC-signed webhooks

Verify webhook authenticity with SHA-256 HMAC signatures. No guessing if it's real.

LLM-friendly docs

Machine-readable docs at /llms.txt and /llms-full.txt for AI coding assistants.

CSV export & API keys

Export all data as CSV. Create API keys for CI/CD and automation workflows.

Frequently asked questions

Is the free tier really free forever?

Yes. The free tier includes 500 submissions per month, 3 forms, email notifications, spam protection, and API access. No credit card required. No time limit.

How does InputHaven compare to Formspree?

InputHaven offers 10x more free submissions (500 vs 50), costs 80% less for paid plans ($5/mo vs $25/mo for similar features), and includes AI spam filtering and conditional email routing that Formspree doesn't offer.

Is the form ID safe to put in my HTML?

Yes. The form ID is a public identifier, not a secret key. It only allows submitting data to your form. Protection comes from CORS domain allowlists, rate limiting, spam filtering, and honeypot fields.

What frameworks does InputHaven work with?

Any framework that can render HTML or make HTTP requests: React, Next.js, Vue, Nuxt, Svelte, SvelteKit, Astro, Angular, Remix, Gatsby, Hugo, Jekyll, plain HTML, and more.

How does AI spam filtering work?

On Starter plans and above, submissions pass through Claude-powered classification that understands context and intent. It catches sophisticated spam that keyword filters miss, with zero configuration required.

Can I self-host InputHaven?

InputHaven is a hosted service. For self-hosting, you'd need to run the full stack (PostgreSQL, Redis, R2, Resend). The hosted version handles all infrastructure so you can focus on building.

Ready to stop building form backends?

Create your free account and start collecting form submissions in under a minute.

Get Started Free Compare Plans

500 submissions/month free. No credit card. No lock-in.