Fillout vs Formstack

Fillout is a modern online form builder that stands out for its native, two-way integrations with the databases teams already run their operations in. It writes form submissions directly into Airtable, Notion, Google Sheets, HubSpot, Salesforce and other tools, and, unlike most form builders, it can also prefill and update existing records instead of only creating new rows.

The builder supports multi-page forms with conditional logic, calculations and scoring, quizzes, file uploads, signatures, payments through Stripe and appointment scheduling, plus PDF generation and post-submission workflows. Record pickers let respondents select an existing Airtable or Notion item, and URL parameters prefill fields for personalized links. The free plan includes unlimited forms and a generous monthly response allowance; Starter, Pro and Business plans increase response limits and add branding removal, custom domains, team collaboration and enterprise options.

Fillout fits operations teams, agencies and startups that use Airtable or Notion as a lightweight database and need forms for intake, approvals, client onboarding or record updates. Analytics are still basic, and the template library is smaller than older competitors. Typeform remains stronger for highly branded, one-question-at-a-time conversational experiences; Tally offers the most generous free plan for general-purpose forms; and Jotform has a much larger template catalog and HIPAA-oriented features for regulated industries.

Formstack is a no-code forms and workflow platform founded in 2006 in Indianapolis by Ade Olonoh. Over the years it added Formstack Documents (from the WebMerge acquisition) and Formstack Sign, and bought Formsite. In 2025 the company renamed itself Intellistack and moved its headquarters to Denver, but Formstack products continue to be sold and supported under their own brand.

Formstack Forms covers drag-and-drop forms with conditional logic, payments, approval workflows, HIPAA-ready data handling, data encryption and offline collection through the Formstack Go mobile app. Documents turns submissions into filled PDFs or Word files, and Sign collects legally binding signatures, so a typical flow runs from intake form to generated contract to signature. Plans start with Forms for one builder user, Suite bundles all three products for three users, and Enterprise and Salesforce Solutions are quoted.

Formstack fits healthcare, education, government and financial teams that care about compliance and want forms, documents and signatures from one vendor. Jotform offers far more templates at lower prices, Typeform is better for conversational marketing forms, and Fillout gives modern forms with a generous free plan. Formstack has no free plan and per-form submission caps.

For Salesforce users, the native Salesforce forms product is the main reason to choose Formstack. Use the 14-day trial to confirm the submission limit per form fits your volume.