Keep the interface your team already built and add a clear-priced backend for submissions, files, spam protection, email, and automation. Choose FormAssembly when deep Salesforce orchestration, approvals, e-signatures, or enterprise compliance are the actual requirement.
Side by side
FormAssembly Atlas combines a form builder with business workflows, Salesforce data operations, documents, signatures, governance, and enterprise security. Form Plume solves the narrower custom-form backend job. Because FormAssembly does not publish dollar prices for its current Atlas plans, this comparison reports its sales-led buying path instead of estimating a subscription cost.
| Decision point | Form Plume | FormAssembly |
|---|---|---|
| Buying and pricing | Free plan · Pro at $12 / month 10,000 monthly submissions, unlimited forms, API access, and unlimited signed webhooks on Pro. | Trial and sales-led plans · prices not published Atlas Explorer starts the plan range, while Team, Enterprise, and Gov Cloud expand workflow, security, and support scope. |
| Forms and response volume | Unlimited forms · 500 responses / month on Free Pro pools 10,000 monthly submissions across unlimited endpoints with two-year retention. | Unlimited forms, responses, and storage FormAssembly says every Atlas plan avoids form and response caps; Explorer includes three active workflows. |
| Form ownership and publishing | Your existing HTML or app component Connect a standard action or fetch request while design, validation, analytics, and release control stay in your repository. | Builder-authored forms with several publishing modes Use a hosted link, JavaScript, iframe, copied HTML, or server-side REST embed; copied HTML must be republished after builder changes. |
| Salesforce data collection | Route clean data through automation or webhooks Use Form Plume's integration layer when Salesforce is one destination rather than the center of the intake architecture. | Deep bidirectional Salesforce connector Create, update, and look up standard or custom records, prefill forms, attach files, and trigger workflows with mapped data. |
| Multi-step business processes | Focused intake plus downstream delivery Keep approvals and multi-party process state in your application or the automation system your team already operates. | Visual workflows, approvals, documents, and signatures Team and higher plans can combine forms, email, conditional routing, connectors, approval processes, document generation, and multi-signer e-signatures. |
| APIs, webhooks, and integrations | 1 signed webhook on Free Pro adds API access, unlimited signed destinations, retries, delivery logs, native routes, Zapier, Make, and MindCloud. | REST API plus native and configurable connectors Its catalog covers Salesforce, HubSpot, payments, storage, spreadsheets, and more; the OAuth/API-key Webhook Connector is a Team add-on. |
| File collection | 100 MB on Free · 10 GB on Pro Uploads work with the custom form you already own and can be forwarded through its delivery routes. | Unlimited total storage · 30 MB per response by default A form can contain up to 20 upload fields; eligible accounts may request a 35 MB response limit and route files into Salesforce Files. |
| Spam, security, and compliance | Layered spam defense with recoverable quarantine Use four CAPTCHA choices, adaptive filtering, honeypots, time traps, rate limits, domain controls, email hygiene, and blocklists. | Enterprise intake governance and regulated environments reCAPTCHA or ALTCHA plus Akismet are available; enterprise scope includes HIPAA with BAA, PCI DSS Level 1, GDPR, FERPA, and Gov Cloud options. |
Where Form Plume pulls ahead
FormAssembly is designed to govern complex data collection across teams and systems. Form Plume gives a developer-owned interface the operational essentials directly, with visible limits and pricing that do not require an enterprise evaluation.
FormAssembly's current Atlas page explains Explorer, Team, Enterprise, and Gov Cloud capabilities but directs visitors to a trial or demo rather than displaying subscription prices. Form Plume publishes a permanent Free tier and a $12 monthly Pro tier with 10,000 submissions, unlimited forms, API access, and unlimited signed webhooks.
FormAssembly offers hosted, JavaScript, iframe, HTML, and REST publishing for forms created in its builder. Form Plume starts with the semantic HTML or framework component already in your codebase, so there is no second rendering system to theme, embed, republish, or keep aligned with product releases.
FormAssembly earns its enterprise position with conditional workflows, connector steps, approvals, documents, signatures, identity, and governance. When the job is simply to receive a custom form safely and deliver the result to people and systems, Form Plume offers a smaller architecture and a faster self-serve path.
Choose by situation
Custom contact, lead, or application form
Form Plume
The existing interface can keep its exact design and behavior while an endpoint adds storage, files, notifications, spam controls, and automation.
Salesforce-centered intake program
FormAssembly
Its mature connector can prefill data and create, update, or look up records across standard and custom objects with no-code mapping.
Agency operating many coded client sites
Form Plume
Unlimited forms, pooled capacity, transparent pricing, and code-owned presentation reduce platform administration across varied brands and stacks.
Regulated, multi-party approval workflow
FormAssembly
Atlas Enterprise and Gov Cloud pair workflow orchestration with identity, documents, signatures, data residency, HIPAA options, and government-focused controls.
FAQ
Form Plume is a strong FormAssembly alternative when your team has already designed and coded the visible form. Connect its standard action or fetch request to a hosted endpoint and add submissions, file handling, spam protection, notifications, and automation without moving the interface into a form builder.
Form Plume publishes a permanent Free plan and a $12 monthly Pro plan with 10,000 submissions and unlimited forms. FormAssembly's current Atlas plan page describes Explorer, Team, Enterprise, and Gov Cloud but does not publish dollar prices, so prospective customers are directed to request a trial or book a demo for commercial details.
Yes. FormAssembly states that every Atlas plan includes unlimited forms, responses, and storage, which is a genuine advantage for high-volume enterprise collection. Form Plume instead publishes monthly submission allowances, making it better suited to teams that prefer a predictable self-serve price and can size their usage against a clear limit.
Yes, but the migration replaces a builder-authored form with HTML or framework components you host. Recreate the required fields, preserve any validation and conditional behavior, connect a Form Plume endpoint, then test success, error, upload, spam, notification, and delivery paths before retiring the FormAssembly publication.
FormAssembly is usually the stronger choice when Salesforce is the system around which the entire intake process is designed. Its connectors support prefill, standard and custom objects, record lookup, create and update operations, file attachment, and workflow orchestration. Form Plume is better when Salesforce is only one downstream destination for a custom form.
Yes. Every FormAssembly plan includes its REST API, while its newer configurable Webhook Connector supports OAuth, API keys, several request methods, and custom payloads as a Team-plan add-on. Form Plume includes one signed webhook on Free and adds API access, unlimited destinations, retries, and delivery logs on Pro.
Yes. FormAssembly supports up to 20 upload fields and a 30 MB total per response by default, with eligible accounts able to request 35 MB, and it can send uploads into Salesforce Files and storage connectors. Form Plume includes file storage on Free and expands it to 10 GB on Pro for code-owned forms.
Both provide meaningful protection. FormAssembly supports reCAPTCHA or privacy-oriented ALTCHA and can add Akismet filtering, with some capabilities dependent on plan or setup. Form Plume combines four CAPTCHA choices with honeypots, time traps, adaptive scoring, rate limits, domain controls, email hygiene, blocklists, and a recoverable quarantine.
Not as an all-in-one workflow builder. Form Plume handles intake and dependable outbound delivery, leaving approvals, document generation, signatures, and multi-party state to your application or connected automation tools. Keep FormAssembly when nontechnical teams need those processes modeled and governed inside one visual platform.
Keep FormAssembly when unlimited response volume, deep Salesforce operations, visual workflows, approvals, documents, e-signatures, identity controls, HIPAA with a BAA, PCI requirements, data residency, or Gov Cloud meaningfully reduce risk and implementation work. Choose Form Plume when you primarily need transparent infrastructure behind a custom form your team owns.
One line. Zero backend.
