Use unlimited forms, collect 500 monthly submissions, accept files, and connect one signed webhook on Free. Form Plume removes the one-endpoint constraint without giving up a developer-first workflow.
Side by side
Both products charge $12 per month for 10,000 submissions at their first paid tier. The practical choice is about the free runway, endpoint limits, storage policy, upload needs, and which developer tools fit your stack.
| Decision point | Form Plume | Submit JSON |
|---|---|---|
| Free endpoints and submissions | Unlimited forms · 500 submissions / month Enough room to separate campaigns, clients, and website sections. | 1 endpoint · 150 submissions / month One project, email notifications, endpoint security, and CAPTCHA are included. |
| First paid capacity | 10,000 submissions for $12 / month Unlimited forms, API access, and unlimited signed webhooks. | 10,000 submissions for $12 / month Pro includes 100 endpoints, 20 projects, and overage at $1.50 per 1,000 submissions. |
| Submission retention | 60 days on Free 2 years on Pro | Stored until deleted while the account is active Submit JSON says product content is deleted within 60 days after account deletion. |
| File uploads | Included on Free 100 MB on Free and 10 GB on Pro | Not listed in the current plan table or product overview The published feature set focuses on JSON and form data, notifications, storage, and routing. |
| Webhooks and API access | 1 signed webhook on Free Pro adds unlimited signed webhooks, API access, retries, and delivery logs. | Webhooks and full API access on Pro Webhook setup supports custom headers and a built-in test request; the REST API uses an OpenAPI 3.1 specification. |
| Integration routes | Native destinations plus flexible automation paths Slack, Discord, Sheets, ActiveCampaign, Mailchimp, Zapier, Make, MindCloud, and signed webhooks | Five named integrations plus webhooks Slack, Discord, Google Sheets, Telegram, Zapier, and webhooks are listed on Pro. |
| Spam and endpoint security | Layered controls with recoverable quarantine Turnstile, honeypots, domain controls, rate limits, blocklists, email hygiene, and adaptive scoring | Three CAPTCHA options, honeypots, domains, and API keys Submit JSON documents reCAPTCHA, Turnstile, hCaptcha, custom honeypot fields, origin restrictions, and API-key security. |
| Developer tooling and exports | Standard form posts · CSV and API on Pro Use native HTML or fetch without adopting a client library. | Beta · TypeScript SDK · export and full API on Pro The docs label Submit JSON beta. Its SDK supports browsers, Node.js, Bun, Deno, and edge runtimes; framework examples cover common JavaScript stacks. |
Where Form Plume pulls ahead
Submit JSON has a thoughtful SDK and security model. Form Plume becomes the better fit when one free endpoint is too restrictive or when attachments and webhook delivery are part of the first production version.
Submit JSON Free allows one endpoint in one project. Form Plume keeps forms unlimited, so a contact page, waitlist, support form, and client campaign can remain separate without an endpoint-count upgrade.
Form Plume publishes explicit upload and storage allowances from Free onward. Submit JSON's current pricing table and product overview do not list file uploads, so attachment-heavy applications need a separately verified storage path.
Submit JSON lists webhooks on its $12 Pro plan. Form Plume includes one signed webhook on Free, which is enough to test or run a focused downstream workflow before paying for unlimited routes.
Choose by situation
Several forms across a portfolio or agency account
Form Plume
Unlimited forms avoid turning every new endpoint or client project into a plan-limit decision.
TypeScript application wanting a dedicated SDK
Submit JSON
Its documented client supports modern browsers, Node.js, Bun, Deno, and edge runtimes with a small configured API.
Long-lived archive on a free active account
Submit JSON
Submit JSON says it stores data until it is deleted, while Form Plume Free has a defined 60-day retention window.
Application or intake form with attachments
Form Plume
Uploads and 100 MB of file storage are explicit Free-plan capabilities instead of an undocumented assumption.
FAQ
Submit JSON Free lists one endpoint, one project, 150 monthly submissions, email notifications, endpoint security, and CAPTCHA. Form Plume Free lists unlimited forms, 500 submissions, 60-day retention, 100 MB of file storage, and one signed webhook.
Their first paid plans have the same current monthly price and submission allowance: $12 for 10,000 submissions. Form Plume Pro keeps forms unlimited, while Submit JSON Pro lists 100 endpoints and 20 projects. Compare the included workflow features instead of price alone.
Yes. Submit JSON offers a documented TypeScript client, API-key endpoint security, Telegram delivery, broad framework examples, and storage that its site says lasts until deletion while an account remains active. Those are meaningful strengths for SDK-first teams and long-lived free archives.
Yes, but the documented browser flows differ. Form Plume supports a native HTML form action or a fetch request. Submit JSON's current HTML example intercepts the form with JavaScript and sends its FormData through the SDK or fetch, rather than demonstrating a no-JavaScript form action.
Usually. Create a Form Plume form, replace the Submit JSON endpoint or SDK call with the new action URL, and test the success and failure paths. Keep the old endpoint available until email delivery, spam controls, and downstream automation are verified.
Form Plume is easier to test without paying because Free includes one signed webhook. Submit JSON puts webhooks on Pro and provides a built-in test request with custom headers. At $12 per month, Form Plume offers unlimited signed webhooks while Submit JSON combines webhooks with its broader Pro feature set.
Submit JSON has an unusually strong published endpoint-security set: reCAPTCHA, Turnstile, hCaptcha, honeypots, restricted origins, and API keys. Form Plume combines Turnstile, honeypots, domain controls, blocklists, rate limits, email hygiene, adaptive scoring, and a recoverable spam quarantine. Choose around the controls your threat model needs.
Compare Formspark for one-time submission credits, Web3Forms for a lightweight endpoint with a larger free allowance, and Formspree for its mature ecosystem. The alternatives hub keeps the same pricing and feature criteria across the full category.
One line. Zero backend.
