Fillout vs Formstack vs Heyflow

Fillout

Freemium / Subscription · From Free (paid plans from $15/month billed annually)

Best for: Teams that want a generous free tier, unlimited seats, and native two-way sync into Notion or Airtable without added automation tools.

Formstack

Subscription (tiered plans plus custom Enterprise and Salesforce pricing) · From $83/month (Forms plan, billed annually)

Best for: Regulated organizations needing HIPAA- or PCI-compliant forms bundled with document generation, e-signatures, and deep Salesforce integration.

Heyflow

Freemium · From Free (10 responses/month); paid plans from $22/month

Best for: Marketing teams running paid acquisition campaigns who need high-converting, multi-step lead funnels with built-in ad tracking and lead validation.

Fillout

Formstack

Heyflow

Fillout

Pros

• Generous free plan with 1,000 responses per month and unlimited forms and seats, more permissive than many competitors' free tiers.
• Unlimited seats on every paid tier removes the per-user cost penalty common in other form builders.
• Native two-way sync with Notion and Airtable avoids the latency and extra cost of Zapier-style automation middleware.
• Broad feature set (payments, e-signatures, scheduling, PDF generation) reduces the need for separate point tools.

Cons

• Paid tiers are gated primarily by monthly response volume, which can require an upgrade sooner for high-traffic forms.
• Removing Fillout's own branding requires at least the Pro plan, not available on Free or Starter.
• Advanced governance features like SSO and audit logs are reserved for the custom-priced Enterprise tier.
• The company's 2025-2026 restructuring under the Zite parent brand may create some confusion for customers researching the company versus the product.

Formstack

Pros

• Broad feature set spanning forms, document generation, and e-signatures in one platform
• Strong compliance credentials, including HIPAA- and PCI-compliant form configurations
• Deep native Salesforce integration for enterprise CRM-driven workflows
• Nearly two decades of operating history and a large integration ecosystem

Cons

• No permanent free plan, only a 14-day free trial of the core Forms product
• Entry-level pricing is higher than lightweight competitors like Google Forms or Wufoo
• Suite and Enterprise pricing can become expensive for organizations needing high usage limits
• Recent corporate rebrand to Intellistack may create short-term confusion about the product's ownership

Heyflow

Pros

• Multi-step funnel approach converts better than static forms for paid acquisition
• Strong lead-quality tools with phone and OTP validation built in
• Large template and integration library for fast setup
• Native Meta and Google Ads integrations aid tracking and optimization
• GDPR-conscious, EU-based provider popular with DACH and European marketers

Cons

• Pricing scales with response volume, which can get expensive for high-traffic campaigns
• Branding removal and A/B testing are gated behind higher-tier plans
• Free plan is limited to only 10 responses per month
• Smaller global brand recognition compared to Typeform or Unbounce
• Advanced features like custom code require Scale or Enterprise tiers

Fillout

• Lead capture synced to Airtable or Notion — Marketing and sales teams use Fillout to collect leads through embedded forms that write directly into an existing Notion or Airtable database in real time.
• Client intake and payment collection — Agencies and service businesses use Fillout to build intake forms that collect information, e-signatures, and upfront payments in a single step.
• Internal surveys and feedback forms — Operations teams use Fillout's unlimited-seat model to let every employee create and share internal surveys or feedback forms without added per-user cost.

Formstack

• HR onboarding and internal workflows — HR teams collect new-hire paperwork and route it through approval workflows without manual data entry.
• HIPAA-compliant patient intake — Healthcare organizations collect patient intake data through compliant, secure online forms.
• Nonprofit donation and event registration — Nonprofits collect donations and manage event registrations with payment processing built into the form.

Heyflow

• B2B lead generation — Sales and marketing teams build multi-step qualification funnels that route higher-intent leads to sales while filtering out fake submissions.
• Real estate and financial services — Agencies build mortgage calculators, property finders, and insurance quote flows that personalize pricing based on user input.
• Performance marketing campaigns — Paid acquisition teams replace static landing page forms with interactive funnels connected directly to Meta and Google Ads.