A Basin alternative built for shipping.

If you're a developer wiring forms into the broader stack — webhooks into HubSpot, Slack, internal tools, AI agents via MCP — splitforms is the right fit. The free tier covers 500 submissions/month, the API is open on every plan, and the $5/mo Pro plan covers 5,000 submissions with no per-form caps. Basin's API is gated behind enterprise contracts, which makes it a non-starter for any developer who wants to programmatically pull submissions, build a custom dashboard, or drive workflows from form data.

Basin's natural buyer is a designer or freelancer building marketing sites for non-technical clients who'll log into the form dashboard themselves. If your job is shipping the form and walking away, Basin's UI polish is real. If your job is integrating the form into a system, splitforms is the better tool.

The most common trigger is the locked API. Basin's API is enterprise-only, which means standard plans can't programmatically fetch submissions, build a custom integration, or drive automation from form data. splitforms' read API is open on every plan including free — fetch submissions, sync to your database, and drive an AI agent; paid delivery features start on paid plans.

The second trigger is the free-tier ceiling. Basin's listed free tier caps at 50 submissions/month, which is enough for a personal site but not for a small business. splitforms gives you 500/month free with a real dashboard; Pro adds signed webhooks, notifications, and Storage-backed uploads for $5/month.

The third trigger is webhook gating. Basin's free tier doesn't include webhooks; you need to upgrade to wire form submissions into anything else. splitforms unlocks HMAC-SHA256 signed webhooks (single delivery attempt, 8-second timeout) on Pro for $5/month.

Free tier

splitforms 500 submissions/month and unlimited forms; Basin's listed Free plan is 50 submissions/month and 1 endpoint. splitforms includes the dashboard on Free, while Pro adds webhooks and Storage-backed uploads.

API

splitforms ships an open REST API and MCP server on every plan. Basin's API is locked behind enterprise contracts.

Webhooks

splitforms unlocks HMAC-SHA256 signed webhooks (single delivery attempt, 8-second timeout) on paid plans. Basin gates webhooks to paid tiers.

Spam protection

splitforms uses an AI classifier on top of honeypot — built specifically for modern LLM-written spam. Basin uses Akismet, which was designed for blog-comment spam two decades ago.

Slack

Basin has first-class Slack routing in the UI. splitforms drives Slack via webhook — one extra step to configure, identical end result.

UI

Basin's dashboard is tuned for non-technical operators. splitforms' dashboard is tuned for developers and operators who want fast inspection.

• “I want to programmatically pull my submissions and Basin's API is enterprise-only.”

  splitforms' API is open on every plan including free.

• “I need webhooks but I'm on a tiny budget.”

  splitforms unlocks HMAC-SHA256 signed webhooks (single delivery attempt, 8-second timeout) on the $5/month Pro plan.

• “My free tier ran out at 50 submissions and I'm not ready to pay yet.”

  splitforms' free tier covers 500 submissions/month with dashboard storage and spam filtering.

• “Akismet is missing the AI-generated spam I'm getting now.”

  splitforms uses an AI classifier specifically trained on modern LLM-written form spam.

• “I want to expose form submissions to a Claude or Cursor agent.”

  splitforms ships an MCP server natively.

splitforms is built for the developer who's the one wiring the form into the broader stack. The dashboard is functional — search, filter, export — but the real value is in the API surface and the integration story.

Open REST API on every plan: fetch submissions, list forms, manage webhooks, all from your own code. No enterprise contract required.

MCP server for AI agents: Claude, Cursor, and other MCP-aware tools can read and act on form data natively. No custom integration code needed.

HMAC-SHA256 signed webhooks on paid plans: every payload carries an `sha256=`-prefixed signature header your receiver can verify, each webhook is scoped to a single form, and delivery is a single attempt with an 8-second timeout — the free webhook tester at splitforms.com/webhook-tester lets you inspect the exact payload before you go live.

AI spam classifier: trained on modern LLM-generated spam, accurate enough that you can drop CAPTCHA on most forms and stop punishing legitimate users.

$59 3-Year plan: pay every 3 years, ship for 36 months at 15,000 submissions/month, no monthly billing.

Step 1: get a free splitforms access key (no credit card). Step 2: change your form's action from `https://usebasin.com/f/YOUR_ID` to `https://splitforms.com/api/submit`. Step 3: test a submission and confirm it lands in the dashboard.

Basin's spam settings, redirect URLs, and CC recipients have direct equivalents in the splitforms dashboard. Slack workflows transfer cleanly: paste your Slack incoming-webhook URL into the splitforms webhook setting and submissions route to your channel exactly as they did from Basin. If you've been using Akismet for spam, splitforms' AI classifier covers the same job and catches modern AI-generated spam Akismet misses.

Day 1, minute zero: `grep -r 'usebasin.com' .` across your project. Most Basin setups put the action URL directly in the form HTML, so you'll find one or two `action="https://usebasin.com/f/abc123"` lines in `app/contact/page.tsx`, `components/ContactForm.tsx`, or wherever your form lives. Open a `splitforms-migration` branch, swap each URL for `https://splitforms.com/api/submit`, and add the new env var to `.env.local` plus your hosting platform's env (Vercel, Cloudflare, your Kubernetes secrets — wherever production runs). If you've been driving Slack notifications through Basin's first-class Slack integration, copy the Slack incoming-webhook URL from your Slack app's settings — you'll paste it into splitforms's webhook config in a moment.

Minute fifteen: deploy a preview branch. Submit a real test entry from the preview URL, watch it appear in the splitforms dashboard, then go to splitforms's webhooks tab and paste the Slack incoming-webhook URL there. Submit again — the message should land in your Slack channel within a second. Now run shadow mode: in your form handler, fire `Promise.allSettled([basinPost, splitformsPost])` so both backends receive every submission for 24 hours. This is also the moment to compare spam filtering — splitforms's AI classifier will flag a different mix of submissions than Basin's Akismet, and shadow mode lets you eyeball both lists side-by-side before committing.

Day 2: remove the Basin `fetch` call, redeploy, monitor for another 24 hours. Once the splitforms-only path has run clean, archive the Basin form from their dashboard and cancel the subscription. The whole window costs nothing for dashboard validation — splitforms's free tier (500 submissions/month, unlimited forms) covers the shadow-mode capture for any small-to-mid traffic site, and Pro adds webhooks for $5/month if you need downstream delivery during the trial.

If your team already has a Basin SSO setup with an enterprise contract, custom data-processing terms, and a designer or non-technical client who logs into the Basin dashboard themselves to triage submissions, splitforms's $5/mo Pro plan won't move the needle and the migration cost outweighs the savings. Basin's UI polish for non-technical operators is genuinely better than splitforms's developer-focused dashboard — if a freelance designer built the site, handed Basin's login to a marketing manager, and that workflow has been running cleanly for two years, breaking it to save fifteen dollars a month is a bad trade.

Basin is also the right call if you specifically want first-class Slack routing configured inside the form-backend's UI rather than via webhook. Splitforms hits Slack via a webhook URL — the end result is identical, but it's one extra configuration step, and for a designer or freelancer who doesn't want to think about webhooks at all, Basin's native Slack panel is a real workflow advantage worth paying for.

And if you've leaned heavily on Akismet because your spam profile is traditional comment-style spam (real human spammers filling out forms with link-laden bodies), Akismet is genuinely well-tuned for that. Splitforms's AI classifier is built for modern LLM-written spam, which is a different problem; if your spam looks like 2008-era forum spam rather than 2026-era ChatGPT-written outreach, Basin's Akismet integration may catch more of it.

Is splitforms a viable Basin alternative? Yes. Every core capability — POST endpoint, dashboard, spam filtering, custom redirects, CC recipients, Slack notifications — is covered, with an open API on every plan and webhooks on paid plans.

Does splitforms have a Basin-style Slack integration? Yes, via webhook. Paste your Slack incoming-webhook URL into the splitforms dashboard and submissions route to your channel.

What about Akismet for spam? splitforms uses an AI classifier that's specifically trained on modern form spam, including LLM-generated submissions. Most teams find it more accurate for new spam patterns.

Can I access my submissions via API? Yes, on every plan including free. splitforms' API is open by default.

Does splitforms have a long-term plan? Yes — $59 for the 3-Year plan, which covers 15,000 submissions/month for 36 months.

Is there a per-form limit? No. Every plan — Free, Starter, Pro, and 3-Year — includes unlimited forms.