Best Form Backend in 2026: 6 Free Options Compared

A form backend is a URL your form posts to. It accepts each submission, filters spam, stores it and emails you, so a static site, a React app or a site builder can take messages without a server of your own. If that's new to you, how to add a contact form to a static website without a backend starts from the beginning. This post is about choosing one.

All six services do that core job the same way: you change your form's action, and submissions start arriving. What separates them is what the free plan keeps, what each step up costs, how they stop spam and how hard they are to leave.

How we compared them#

• The free plan. Submissions a month, number of forms, and how long submissions are kept.
• Price at real volumes. What 250, 1,000, 5,000 and 20,000 submissions a month cost.
• Spam protection you get without paying, and whether it makes visitors solve a CAPTCHA.
• Lock-in. Whether it only works on one host, and whether you can export your data.
• What goes in your HTML. A form key, an access key, a host attribute or your email address.

Plans change. The prices here are what each pricing page showed in late October 2026, and the sources are at the end.

The six form backends at a glance#

Formspree: the default most tutorials use#

Best for: sites with many small forms, or teams who want Slack and Discord alerts without paying.

<form action="https://formspree.io/f/YOUR_FORM_ID" method="POST">

Formspree created the category in 2014. It is the endpoint most templates, tutorials and AI coding tools write when you ask for a contact form.

Where it's strong

• Unlimited forms on the free plan.
• Slack, Discord, Telegram and WhatsApp alerts on every plan, including Free.
• Domain restriction and custom reCAPTCHA on the free plan.
• Plans up to 20,000 submissions a month on Business, with custom plans above that.

Where it falls short

• The free plan is 50 submissions a month, archived for 30 days, with no search or export.
• Every step up is small. $15 a month covers 200, $30 covers 2,000 and $90 covers 20,000. Billed yearly, that is $120, $240 and $720.
• Webhooks and autoresponses start on Professional, at $30 a month.

See Nisuform vs Formspree for the full side by side.

Web3Forms: the biggest free plan#

Best for: getting the most free submissions across several small sites.

<form action="https://api.web3forms.com/submit" method="POST">
  <input type="hidden" name="access_key" value="YOUR_ACCESS_KEY">

Web3Forms has run since 2020. You get an access key by email and put it in a hidden input.

Where it's strong

• 250 submissions a month and unlimited forms, the largest free plan of any service here that needs an account.
• Free redirects to your own thank-you page.
• hCaptcha on the free plan, with a shared site key.
• Pro covers 10,000 submissions a month for $149 a year, with a discounted plan for students, non-profits and early-stage startups by application.

Where it falls short

• The free plan shows 30 days of history.
• Turnstile, reCAPTCHA, your own hCaptcha keys and domain restriction need a paid plan, so free forms can be posted to from any site.
• File uploads, webhooks, autoresponders and CC addresses need a paid plan too.

See Nisuform vs Web3Forms.

FormSubmit: no account at all#

Best for: a quick form that only needs to email you.

<form action="https://formsubmit.co/you@example.com" method="POST">

Put your address in the action, submit once, click the confirmation email, and the form works. There is no account and no fee.

Where it's strong

• No account and no price.
• Redirects, autoresponses, webhooks, CC addresses and email templates are all free, set with special fields like _next and _autoresponse.
• It says more than 400,000 websites have used it.

Where it falls short

• By default, your email address sits in your page source, where scrapers collect addresses for spam.
• Email is where submissions live. Its help page says it keeps them for 30 days and doesn't keep uploaded files.
• reCAPTCHA is on by default, and FormSubmit advises keeping it on, so visitors may have to solve a challenge.
• Being free means there is no plan to upgrade to if you need more control or support.

See Nisuform vs FormSubmit.

Netlify Forms: free if Netlify hosts your site#

Best for: plain HTML sites deployed on Netlify that will stay there.

<form name="contact" method="POST" data-netlify="true">

Netlify reads your HTML at deploy time, finds forms with data-netlify="true" and handles their submissions itself.

Where it's strong

• Free with no monthly limit on Netlify's credit-based plans since April 2026.
• Nothing else to sign up for. Submissions are in the Netlify dashboard you already use, with CSV export.
• Email, Slack and webhook notifications at no extra cost.
• Akismet spam filtering, plus an optional honeypot and reCAPTCHA 2.

Where it falls short

• It only works on sites Netlify deploys. Move hosts, and your forms stop working.
• Forms rendered with JavaScript, like most React, Vue and AI-built forms, aren't in the HTML Netlify reads, so you have to keep a hidden HTML copy with the same fields.
• No JSON submissions, and file uploads are one file per field, 8 MB per request.

See Nisuform vs Netlify Forms.

Forminit: free file uploads and the biggest plan#

Best for: forms that collect files, or sites with more than 5,000 submissions a month.

<form action="https://forminit.com/f/YOUR_FORM_ID" method="POST">

Forminit is Getform under a new name since January 2026, running since 2015. Older tutorials still show getform.io/f/ URLs.

Where it's strong

• File uploads on the free plan, with 100 MB of storage, and free redirects.
• Business covers 50,000 submissions a month for $50, or $594 a year, the largest priced plan in this list.
• Submissions are kept until you delete them, and on Pro each form can delete them after 30, 90 or 365 days.
• An optional _gotcha honeypot and Cloudflare Turnstile support on top of built-in filtering.

Where it falls short

• One form on the free plan.
• CSV export, webhooks, integrations and autoresponders need Pro, at $16 a month or $190 a year.
• Pro caps you at 10 forms. Unlimited forms means Business at $50 a month.

See Nisuform vs Forminit.

Nisuform: every submission kept, the lowest paid price#

Best for: anyone who wants the free plan to keep their submissions, and a cheap first paid step.

<form action="https://api.nisuform.com/s/YOUR_FORM_KEY" method="POST">

This one is ours. The key in the URL only accepts new submissions, and your form works on any host, with or without JavaScript.

Where it's strong

• The free plan keeps every submission until you delete it, with search and CSV export.
• Spam filtering with nothing to set up: a honeypot, a fill-time check, rate limits, and duplicate and link checks. Cloudflare Turnstile, Google reCAPTCHA and allowed websites work on every plan, and spam never counts toward your monthly limit.
• Pro is $10 a month or $84 a year for 5,000 submissions and unlimited forms, with file uploads, webhooks, auto-replies, and Slack, Discord, Telegram and Google Sheets.
• JSON responses with stable error codes, and a ready-made prompt on each form's Setup tab for Cursor, Claude Code or Lovable.

Where it falls short

• The free plan is 100 submissions a month and 3 forms, smaller than Web3Forms, and Formspree's unlimited forms.
• Redirects, file uploads and chat alerts are Pro only. Web3Forms and Forminit give you redirects for free, and Formspree gives you chat alerts for free.
• Pro tops out at 5,000 submissions a month, with no bigger plan yet.
• It is the youngest service on this list, so it has the shortest track record.

What each one costs at your volume#

Monthly prices for the four services with paid plans:

This assumes one form. If you need more than 1 free form on Forminit, or more than 3 on Nisuform, the Free rows move to the first paid plan.

Billed yearly at 5,000 submissions a month, a year costs $720 on Formspree, $190 on Forminit, $149 on Web3Forms and $84 on Nisuform.

FormSubmit and Netlify Forms don't charge for submissions at any volume. With FormSubmit you trade that for email only and 30 days of history. With Netlify Forms, you trade it for staying on Netlify.

Spam protection on the free plan#

A CAPTCHA costs you real messages, because some people give up when they see one. Invisible checks like a honeypot and a fill-time check stop most bots without asking visitors to do anything. Domain restriction stops other sites from posting to your endpoint, so a copied key can't be used from someone else's page.

How to add a contact form to a static website without a backend goes deeper on each check.

Questions to ask before you pick#

1. How many submissions will you get? A portfolio contact form might get 20 a month. A busy landing page can pass 200. Look at the step after the free plan, not just the free plan.
2. Do you need old submissions? The free plans of Formspree, Web3Forms and FormSubmit keep 30 days of history. If the only copy of a lead is an email that landed in spam, it is gone.
3. What ends up in your HTML? A form key or access key is meant to be public. An email address in the action is readable by anyone.
4. Are you tied to your host? Netlify Forms stops working if your site moves. The other five work on any host.
5. Is the form rendered by JavaScript? React, Vue, Svelte and AI app builders work with any endpoint-based service. Netlify Forms needs a hidden HTML copy.
6. Can you get your data out? CSV export is free on Nisuform and Netlify Forms, starts on Personal at Formspree and on Pro at Forminit.

Switching later is a one-line change#

Every service here takes a normal HTML form post, so you can move a form between them later. Keep it plain, give every field a name, and keep the service-specific parts to the action and a couple of special fields:

<form action="https://api.nisuform.com/s/YOUR_FORM_KEY" method="POST">
  <label for="name">Name</label>
  <input id="name" type="text" name="name" autocomplete="name" required>

  <label for="email">Email</label>
  <input id="email" type="email" name="email" autocomplete="email" required>

  <label for="message">Message</label>
  <textarea id="message" name="message" rows="5" required></textarea>

  <input type="text" name="_gotcha" tabindex="-1" autocomplete="off" style="display:none">
  <button type="submit">Send</button>
</form>

_gotcha is the honeypot name on Formspree, Forminit and Nisuform. To move to Web3Forms, change the action and add the access_key input. For FormSubmit, put your address in the action. For Netlify Forms, replace the action with name and data-netlify="true".

If you build with React, the React contact form guide has a useActionState version of the same form that works with any of these services.

Which to choose#

Pick the service whose free plan covers your traffic and whose first paid plan you would pay for. If you want every submission kept and searchable on the free plan, and 5,000 a month for $10 after that, try Nisuform.

Sources#

• Formspree plans, checked October 28, 2026
• Web3Forms pricing, Pro features and hCaptcha, checked October 26 to 28, 2026
• FormSubmit and FormSubmit help, checked October 28, 2026
• Netlify Forms setup, submissions and spam filters, and Netlify pricing updates, April 2026
• Forminit pricing, honeypot and Turnstile, checked October 28, 2026
• Nisuform pricing and limits