Use the interface your team already designed and pay for the submission backend it needs. Form Plume brings generous capacity, uploads, layered spam defense, and signed delivery to custom HTML and application forms without adopting a $99-per-month builder.
Side by side
Formstack packages collection, visual authoring, integrations, security controls, and enterprise workflows; Form Plume concentrates on the backend behind custom forms. The table uses Formstack's published monthly price, annually billed price, plan limits, and current help documentation to make that scope difference explicit.
| Decision point | Form Plume | Formstack |
|---|---|---|
| Entry point | Unlimited forms · 500 submissions / month A permanent free plan for custom forms, including uploads, spam controls, email delivery, and one signed webhook. | 14-day trial · no ongoing free plan The core Forms trial requires an upgrade when it ends to keep using the product. |
| First paid plan | 10,000 submissions for $12 / month Unlimited forms, two-year retention, API access, 10 GB of storage, and unlimited signed webhooks. | 25 forms · 1,000 submissions per form · $99 / month Forms costs $83 monthly when paid annually and includes one builder user and 2 GB of storage. |
| How the form is delivered | Your HTML and components stay native Connect the existing action or fetch request while your own code controls fields, styling, validation, analytics, and accessibility. | Hosted builder with link or embed Publish a Formstack URL, JavaScript embed, iframe, Lightbox, or QR code; JavaScript is the recommended website embed. |
| Files and storage | 100 MB on Free · 10 GB on Pro File handling is available from the free tier and remains attached to the form interface you already own. | 2 GB plan storage · up to 2 GB per submission The upload field supports multiple files and configurable types; external storage integrations can extend account capacity. |
| APIs and outbound delivery | 1 signed webhook on Free Pro adds API access, unlimited signed destinations, retry handling, and delivery logs for $12 monthly. | Two Forms API versions and configurable webhooks Formstack offers its established V2 API and OpenAPI-compliant V2025 API; sensitive-payment webhooks can use HMAC. |
| Integrations and payments | Developer routes across broad automation networks Deliver through native integrations, Zapier, Make, MindCloud, or an arbitrary signed webhook target. | 300+ integrations and native payment processors Formstack connects its no-code suite broadly and can process payments with Stripe, PayPal, Authorize.net, and other providers. |
| Spam and data protection | Layered filtering with recoverable quarantine Combine four CAPTCHA options, adaptive scoring, honeypots, time traps, rate limits, domain controls, email hygiene, and blocklists. | Invisible reCAPTCHA and enterprise security controls Formstack adds SSL, database and PGP email encryption, password protection, SSO options, and a mature compliance program. |
| Approvals and regulated workflows | Focused intake infrastructure Route clean submission data into your existing systems without purchasing a visual workflow, document, and signature suite. | Form-to-document-to-sign workflows Suite customers can build conditional steps, assignments, group approvals, audit trails, document generation, and e-signature processes. |
Where Form Plume pulls ahead
Formstack is compelling when operations teams need to build complete processes without code. For a website or product that already has its own interface, Form Plume removes the hosted-builder layer and puts substantially more capacity into a much smaller plan.
Formstack Forms starts at $99 monthly, or $83 per month with annual billing, for 25 forms and 1,000 submissions per form. Form Plume Pro costs $12 monthly and pools 10,000 submissions across unlimited forms, making it easier to justify for contact, lead, application, and product forms that do not require a builder suite.
Formstack's JavaScript, iframe, and Lightbox options bring a Formstack-hosted form into the page. Form Plume accepts submissions from the HTML or framework component already in your codebase, so responsive behavior, field semantics, analytics, validation, and design tokens stay in one place.
Form Plume includes a signed webhook on Free and gives Pro accounts API access, retries, logs, and unlimited destinations. That focused delivery layer suits teams that want to connect their own systems without also purchasing documents, signatures, approvals, or a dedicated success program.
Choose by situation
Custom marketing or product form
Form Plume
The existing interface remains native, while the lower-cost backend handles submissions, files, spam, notifications, and downstream delivery.
Healthcare or regulated intake program
Formstack
Its HIPAA-oriented plans, BAA path, encryption controls, SSO, audit capabilities, and mature security documentation are designed for formal reviews.
Agency managing many coded websites
Form Plume
Unlimited forms and pooled monthly capacity reduce the cost and administration of keeping many client endpoints active.
No-code approval-to-signature process
Formstack
The Suite can join forms, conditional approvals, generated documents, and e-signatures in a governed workflow without a bespoke application.
FAQ
Form Plume is a strong Formstack alternative when your website or product already contains the form interface. Point the existing HTML action at a Form Plume endpoint and keep your own CSS, validation, accessibility, and analytics while adding hosted processing, files, spam filtering, and notifications.
Yes for the published entry plans. Form Plume Pro is $12 monthly for 10,000 pooled submissions and unlimited forms. Formstack Forms is $99 month to month, or $83 per month billed annually, for 25 forms and 1,000 submissions per form. Formstack also includes a no-code builder and enterprise-oriented capabilities that explain part of that difference.
Formstack currently advertises a 14-day Forms trial rather than an ongoing free plan; continued use requires an upgrade after the trial. Form Plume Free is permanent and includes 500 submissions each month, unlimited forms, file storage, spam controls, and one signed webhook.
Yes, but Form Plume processes a form you host rather than reproducing Formstack's builder. Replace the JavaScript, iframe, or Lightbox embed with native HTML or framework components, connect the new endpoint, map the existing field names, and test success, error, file, and spam paths before removing the old form.
Yes. Formstack maintains its established V2 Forms API and an OpenAPI-compliant V2025 API, and it can send form data through webhooks. Form Plume includes one signed webhook on Free; Pro adds API access, unlimited signed destinations, retries, and delivery logs for teams that want a smaller developer-first delivery layer.
Formstack has the stronger conventional catalog, advertising more than 300 integrations across its platform and native payment connections. Form Plume is more flexible for developer-owned routing through native destinations, Zapier, Make, MindCloud, and arbitrary signed webhooks. Choose the exact Formstack connector when it replaces engineering; choose Form Plume when broad automation reach and custom endpoints matter more.
Yes. Formstack's upload field can accept multiple files, control extensions, and handle up to 2 GB across one submission, while its core Forms plan includes 2 GB of account storage. Form Plume includes 100 MB of storage on Free and 10 GB on Pro, making ordinary attachments available without starting on a paid builder plan.
Not by itself. Form Plume handles intake and reliable outbound delivery, then lets your own application or automation platform run the business process. Formstack Suite is the better all-in-one choice when nontechnical teams need visual assignments, conditional approvals, generated documents, and signatures inside one governed product.
Form Plume provides broader day-to-day spam defenses, including four CAPTCHA choices, honeypots, time traps, adaptive filtering, rate limits, email hygiene, domain controls, blocklists, and recoverable quarantine. Formstack is stronger for formal sensitive-data programs because it documents HIPAA-oriented plans, BAAs, encryption, SSO, audit controls, PCI practices, and SOC 2 reports.
Keep Formstack when the hosted builder, payment processors, 300-plus integrations, approval workflows, document generation, e-signatures, Salesforce products, or compliance program already remove meaningful operational work. Choose Form Plume when you own the frontend and primarily need a transparent, high-capacity form backend with uploads, spam protection, notifications, and developer-controlled automation.
One line. Zero backend.
