Two popular form builders compared on the same 25-row feature matrix and pricing, with FormBuilder shown as a third column so you can see another option to consider.
Overview
Formstack started as an online form builder in 2006 and has grown into a workflow suite: Formstack Forms (the builder), Formstack Documents (merge submissions into PDFs, Word files and contracts), and Formstack Sign (e-signature). The pitch is that one platform can take a request from intake form to generated document to signed agreement without code, which is why it sells mainly to operations, HR, healthcare and higher-ed teams.
The form builder itself is capable rather than flashy: drag-and-drop fields, conditional logic, multi-page forms, calculations, save-and-resume, payments (Stripe, PayPal, Authorize.net and others), workflows with approvals, and 300+ integrations. Its Salesforce apps are a genuine differentiator — forms that read and write Salesforce records natively and can live inside Experience Cloud — and it offers HIPAA compliance, PCI and SOC 2 for regulated buyers.
Fillout is a newer form builder built around one idea: your form should live on top of the database you already use. Connect an Airtable base, Notion database, HubSpot object, Salesforce record or Google Sheet, and Fillout maps fields both ways — it can prefill from existing records, create new ones, and update them on submit. For teams running operations out of Airtable or Notion it is often the missing "front door" for their data.
The builder itself is polished and quick, with a large field catalogue (50+ types including payments, scheduling, signatures and PDF generation), conditional logic, calculations, multi-page flows, quizzes and a growing set of AI features for drafting forms. It also supports login-gated forms, partial-submission capture and PDF output, which pushes it toward internal tools and client portals as much as public forms.
Pricing
In each vendor's own terms; Formstack checked 2026-08-17, Fillout checked 2026-08-17. FormBuilder: free plan (5 forms, 100 responses / mo) and Pro at $39 / month or $390 / year.
Feature comparison
25 capabilities across building, design, data workflow and security.
| Feature | FFormstack | FFillout | FFormBuilder |
|---|---|---|---|
| Building | |||
| AI form generation from a prompt | PartialAI features rolling out; not the core building flow | YesAI form builder | Yes |
| Drag-and-drop visual builder | Yes | Yes | Yes |
| Template library | YesHundreds, skewed to HR, healthcare, education | YesLarge gallery incl. Airtable / Notion templates | Yes300+ |
| Conditional logic / branching | Yes | Yes | Yes |
| Multi-page / multi-step forms | Yes | Yes | YesPro |
| Calculations & scoring | Yes | YesCalculations, quizzes & scoring | YesCalculation field + auto-graded quizzes |
| File uploads | Yes2 GB on Forms · 10 GB Suite | Yes20 MB free · 1 GB+ on Business | Yes100 MB free · 1 GB Pro |
| Payment collection | YesStripe, PayPal, Authorize.net, Square & more | YesStripe; free plan | YesStripe — paid to your own account, no platform fee |
| E-signature field | YesSignature field; full e-sign via Formstack Sign | YesStarter, $15 / mo | Yes |
| Design | |||
| Custom themes & branding | YesThemes & CSS | YesThemes on Starter; fonts & CSS on Pro | YesPro |
| Remove vendor badge | YesPaid plans; no free tier | YesPro, $40 / mo | YesPro, $39 |
| Custom domain | YesPaid plans | YesBusiness, $75 / mo | Yes |
| Embed on any site | Yes | Yes | Yes |
| Data & workflow | |||
| Free-plan monthly responses | NoNo free plan; 14-day trial | Yes1,000 / mo | Partial100 / mo, overflow held |
| Over-limit responses kept (not rejected) | PartialPer-form submission caps; overage handled by upgrade | NoForm stops accepting at limit | Yes |
| Email notifications & autoresponders | Yes | YesCustom emails on Pro | Yes |
| Webhooks | Yes | Yes | YesAll plans |
| Zapier / native integrations | Yes300+ native + Zapier; deep Salesforce | YesNative Airtable / Notion / HubSpot / Salesforce / Sheets + Zapier & Make | Yes6,000+ apps |
| Built-in analytics (views, drop-off) | YesSubmission analytics; conversion kit on higher tiers | YesBusiness | Yes |
| CSV / spreadsheet export | Yes | Yes | Yes |
| Team workspaces & collaboration | YesExtra builder seats cost more | YesUnlimited seats & workspaces on all plans | Yes |
| Security | |||
| Password-protected forms | Yes | YesLogin / password forms on Starter | YesPro |
| HIPAA / BAA | YesAdd-on on Forms/Suite; included Salesforce & Enterprise | YesEnterprise only | PartialHIPAA plan coming soon |
| GDPR tooling & DPA | Yes | Yes | Yes |
| SSO / SAML | YesEnterprise | YesEnterprise | PartialEnterprise |
Another option to consider
AI-first form builder with a generous free plan, held (never lost) responses, and 6,000+ integrations. Describe the form you need, the AI drafts it, and you refine it with logic, multi-page layouts, uploads, signatures and Stripe payments. Free plan: 5 forms and 100 responses a month with overflow held, never lost. Pro: $39 / month for 100 forms and 10,000 responses with the badge removed.
Questions
Fillout's entry paid plan (Starter at $15 / month (annual)) is cheaper than Formstack's (Forms at $83 / month (annual, $99 monthly)). Both offer a free plan (1,000 responses / mo · unlimited forms & seats · 20 MB uploads · Fillout branding) and a 14-day trial respectively. Note the plans differ in limits — see the tables above. FormBuilder Pro, for reference, is $39 / month for 10,000 responses.
Formstack offers a 14-day trial. Prices shown are per month billed annually; monthly billing is roughly 20% higher. Submission limits are per form. No free plan — 14-day free trial of Forms.
Fillout offers a free plan (1,000 responses / mo · unlimited forms & seats · 20 MB uploads · Fillout branding). Prices shown are per month on annual billing (about 20% less than monthly). All plans include unlimited forms and unlimited seats; the meaningful limits are monthly responses and features.
Formstack payments: Yes (Stripe, PayPal, Authorize.net, Square & more). Fillout payments: Yes (Stripe; free plan). FormBuilder collects Stripe payments to your own account with no platform fee on every plan, including free.
Formstack HIPAA / BAA: Yes (Add-on on Forms/Suite; included Salesforce & Enterprise). Fillout HIPAA / BAA: Yes (Enterprise only). FormBuilder's HIPAA plan with BAA ($99 / month) is currently rolling out.
Formstack is a no-code workflow platform for mid-size and enterprise teams that bundles forms, document generation and e-signature, with a deep Salesforce integration. Fillout is a fast, modern form builder whose signature trick is writing responses straight into Airtable, Notion, HubSpot, Salesforce and Google Sheets — with a very generous free plan. Formstack is best for operations, HR and admissions teams that need forms to feed documents, approvals and e-signatures; Fillout is best for teams that run on Airtable, Notion, HubSpot or Salesforce and want forms that write directly to those records.
FormBuilder is worth a look if you want an AI generator that drafts forms from a sentence, 100 free responses a month with overflow held rather than lost, Stripe payments with no platform fee, and a flat $39 / month Pro plan for 10,000 responses. See our full FormBuilder vs Formstack and FormBuilder vs Fillout comparisons.
Last reviewed August 2026. Spotted something out of date? Tell us and we'll fix it.
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