The open-source form backend where you bring your own API keys. Store submissions, trigger integrations. No vendor lock-in.
<form
action="https://osforms.com/api/v1/f/your-slug"
method="POST"
>
<input type="text" name="name" placeholder="Name" required />
<input type="email" name="email" placeholder="Email" required />
<textarea name="message" placeholder="Your message"></textarea>
<button type="submit">Send</button>
</form>Built for developers who value control, transparency, and speed.
Your API keys, your data, your control. Export anytime, self-host if you want. No proprietary formats.
Resend, Google Sheets, webhooks—all included. Competitors charge $15/mo for features you already pay for.
REST API, webhook signatures, CORS control. Built by developers who read docs, not marketing decks.
Connect your own API keys. Pay only your provider's costs.
Join developers building forms without limits. Open source. No lock-in.