Surveys · head to head
Fillout vs Formstack
Fillout
Surveys
Form builder that reads and writes records in Airtable, Notion, HubSpot and Salesforce, with unlimited seats on every plan including the free one
- From
- Free
- Rated
- -
Formstack
Surveys
Form builder with document generation and e-signature
- From
- On request
- Rated
- -
The short version
- Only Fillout has a free tier, so it costs nothing to try first.
- Each has a real cost: Fillout the Business plan is marketed with unlimited responses but the fair use policy names thresholds of 30,000 submissions a month, 250,000 in total, 500 forms per account and 50 GB of uploads a month, above which the vendor may limit or suspend features, so unlimited means unmetered rather than uncapped.; Formstack more expensive than form builders that only collect, which is the fair comparison for simple use
- They diverge on capability: Fillout covers Unlimited seats and forms, Formstack covers Form builder.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Fillout and Formstack actually diverge.
Identical on both: user rating (Not yet rated), category (Surveys).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Fillout
- Unlimited seats and forms
- Database read and write
- Soft response limits
- Conditional logic and calculations
- EU hosting
- REST API and webhooks
Only in Formstack
- Form builder
- Document generation
- E-signature
- Workflow routing
- Salesforce integration
- Compliance features
What people use each for
The jobs each tool is most often brought in to do.
Fillout
- A team already running on Airtable or Notion that wants forms which update existing records rather than appending new rowsnot Formstack
- An organisation with many occasional form builders, where per-seat pricing elsewhere would cost more than the forms are worthnot Formstack
- Replacing a survey tool, a scheduling tool and a payment link with one form that does all threenot Formstack
- Public forms that must keep collecting through an unexpected traffic spike rather than shutting off at a quotanot Formstack
Formstack
- Processes where a submitted form must become a signed documentnot Fillout
- Regulated intake needing HIPAA-capable handlingnot Fillout
- Salesforce shops wanting forms and documents inside the CRMnot Fillout
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Fillout
- The Business plan is marketed with unlimited responses but the fair use policy names thresholds of 30,000 submissions a month, 250,000 in total, 500 forms per account and 50 GB of uploads a month, above which the vendor may limit or suspend features, so unlimited means unmetered rather than uncapped.
- EU data residency begins on the Team plan at 250 USD per month, more than three times the Business price, and is not applied automatically; you must upgrade and then raise a support request to be moved.
- The Team plan is hidden behind a secondary tab that does not render without interaction, so buyers reading the pricing page see Business at 75 USD as the top self-serve tier and only discover the 250 USD step when they ask for single sign-on or EU hosting.
- The enterprise marketing page lists hosting in the United States, EU, United Kingdom, Australia and Canada, but the security documentation and subprocessor list name only the United States and the EU, so three of those five regions should be confirmed in writing before they are relied on.
- The vendor is SOC 2 Type 2 but claims neither ISO 27001 nor HIPAA anywhere in its documentation, and it is angel-funded with no disclosed institutional round while the parent company now trades as Zite and ships a separate AI application builder.
Formstack
- More expensive than form builders that only collect, which is the fair comparison for simple use
- Document generation and signature sit in higher tiers, so the headline price is not the working price
- The interface has accumulated features over a long life and shows it
- Overkill where a form only needs to collect an answer
Pricing, plan by plan
Fillout
Free- FreeFree
- 1,000 responses per month
- Unlimited forms and unlimited seats
- 20 MB per file upload
- Starter$15/month
- 180 USD per year billed annually, a stated 20 percent saving on monthly billing
- 2,000 responses per month
- Unlimited forms and seats
- Pro$40/month
- 480 USD per year billed annually
- 5,000 responses per month
- Branding fully removed at this tier
- Business$75/month
- 900 USD per year billed annually
- Marketed as unlimited responses, subject to a fair use threshold near 30,000 per month
- 1 GB per file upload
Formstack
On requestNo published plan breakdown. See the Formstack review.
Which should you pick?
Choose Fillout if
- You need unlimited seats and forms.
- You want to start without paying.
- You work on Web, API.
- You also want database read and write.
Choose Formstack if
- You need form builder.
- You work on Web, Cloud.
- You also want document generation.
Questions people ask
- Is Fillout or Formstack better?
- Neither clearly leads. Fillout starts at Free and Formstack at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Fillout or Formstack?
- Fillout has a free tier; the other does not. Paid plans start at Free for Fillout and On request for Formstack.
- Does Fillout or Formstack run on more platforms?
- Fillout runs on Web, API. Formstack runs on Web, Cloud.
- Can I use Fillout for free?
- Yes. Fillout has a free tier, so you can try it without paying. Formstack starts at On request.
- What is Fillout best used for?
- Fillout is most often used for a team already running on airtable or notion that wants forms which update existing records rather than appending new rows, an organisation with many occasional form builders, where per-seat pricing elsewhere would cost more than the forms are worth, replacing a survey tool, a scheduling tool and a payment link with one form that does all three, public forms that must keep collecting through an unexpected traffic spike rather than shutting off at a quota. Of those, a team already running on airtable or notion that wants forms which update existing records rather than appending new rows and an organisation with many occasional form builders, where per-seat pricing elsewhere would cost more than the forms are worth are not what Formstack is typically brought in for.
- What can Fillout do that Formstack cannot?
- Fillout covers Unlimited seats and forms, Database read and write, Soft response limits, Conditional logic and calculations. Formstack covers Form builder, Document generation, E-signature, Workflow routing.
Answered from the vendors’ own pages
Fillout: Are seats really unlimited?
Yes. The vendor states there are no per-seat charges on any plan, including Free, and forms are unlimited too. Responses per month is the only meter below the Business tier.
Formstack: What does Formstack cost?
It publishes tiered monthly pricing; document generation and e-signature sit in higher tiers, and HIPAA-capable plans are priced separately.
Fillout: What happens when I exceed my response quota?
Nothing breaks. Forms keep collecting, and you can upgrade, buy bulk submissions or wait for the monthly reset.
Formstack: What makes it different from a plain form builder?
It generates documents from submissions and collects signatures on them, which is the step that otherwise involves retyping form data into a template.
Fillout: Can I host respondent data in the EU?
Only from the Team plan at 250 USD per month, and only after contacting support to switch. Note that email and payment subprocessors remain in the United States regardless.
Formstack: Is it HIPAA compliant?
It offers HIPAA-capable plans for regulated data. That is a plan-level feature, not the default.
Fillout: Is the Business plan really unlimited responses?
It is unmetered, not uncapped. The fair use policy names roughly 30,000 submissions a month as the point at which the vendor may intervene, so treat that as the practical ceiling.
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