Softwr

Surveys · head to head

Fillout vs Stacker

Fillout logo

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
Free plan
Yes
Full reviewWebsite
Stacker logo

Stacker

No-Code

Permissioned portals over data that stays in Airtable, Salesforce or Postgres

From
On request
Free plan
No
Full reviewWebsite

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.; Stacker there is no source export and no self-hosting, so leaving means rebuilding the entire interface and permission model elsewhere, even though the underlying records remain yours.
  • They diverge on capability: Fillout covers Unlimited seats and forms, Stacker covers Per-record permissions.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Fillout and Stacker actually diverge.

Attributes where Fillout and Stacker differ
AttributeFilloutStacker
Starting priceFreeOn request
Pricing modelPer month by response countquote
Free tierYesNo
PlatformsWeb, APIWeb
CategorySurveysNo-Code

Identical on both: user rating (Not yet rated).

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 Stacker

  • Per-record permissions
  • External user portals
  • Live connection to the source
  • Page and layout builder
  • Workflow actions
  • Custom domains and branding
  • User onboarding
  • Role based navigation

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 Stacker
  • An organisation with many occasional form builders, where per-seat pricing elsewhere would cost more than the forms are worthnot Stacker
  • Replacing a survey tool, a scheduling tool and a payment link with one form that does all threenot Stacker
  • Public forms that must keep collecting through an unexpected traffic spike rather than shutting off at a quotanot Stacker

Stacker

  • Giving clients a login that shows only their own records inside an internal Airtable basenot Fillout
  • Contractor or franchisee portals where each account must see one slice of a shared datasetnot Fillout
  • Replacing a spreadsheet emailed to partners with a permissioned live view of the same datanot Fillout
  • Putting a usable interface on a Salesforce or Postgres dataset for users who should never see the underlying systemnot 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.

Stacker

  • There is no source export and no self-hosting, so leaving means rebuilding the entire interface and permission model elsewhere, even though the underlying records remain yours.
  • Performance is bounded by the data source, so an Airtable base near its row limit or an API under rate limiting produces a slow portal that no amount of Stacker configuration will fix.
  • Pricing distinguishes internal editors from external portal users, so a portal that succeeds by adding hundreds of light-touch external users can end up costing more than the internal system it fronts.
  • Custom logic is limited to the actions and conditions the builder exposes, so anything resembling a calculation engine or a branching multi-step approval hits a wall and needs an external automation tool bolted on.
  • It is a portal and CRUD tool by design, with no offline mode, no native mobile application and no real reporting layer, so it will not be the only system a growing operation runs.

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

Stacker

On request
  • Stacker$undefined/month
    • Priced by workspace tier with caps on apps and users
    • External portal users charged differently from internal editors
    • Higher tiers add permission depth and support

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.
Fillout review

Choose Stacker if

  • You need per-record permissions.
  • You also want external user portals.
Stacker review

Questions people ask

Is Fillout or Stacker better?
Neither clearly leads. Fillout starts at Free and Stacker at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fillout or Stacker?
Fillout has a free tier; the other does not. Paid plans start at Free for Fillout and On request for Stacker.
Does Fillout or Stacker run on more platforms?
Fillout runs on Web, API. Stacker runs on Web.
Can I use Fillout for free?
Yes. Fillout has a free tier, so you can try it without paying. Stacker 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 Stacker is typically brought in for.
What can Fillout do that Stacker cannot?
Fillout covers Unlimited seats and forms, Database read and write, Soft response limits, Conditional logic and calculations. Stacker covers Per-record permissions, External user portals, Live connection to the source, Page and layout builder.

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.

Stacker: Where does my data live?

In the source you connect: Airtable, Salesforce, HubSpot, Google Sheets or your own Postgres. Stacker reads and writes to it rather than becoming the system of record.

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.

Stacker: Can I export the app if I cancel?

No. The data stays in your source system, but the interface, permissions and workflows are Stacker configuration and do not come with you.

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.

Stacker: Is it suitable for hundreds of external users?

Technically yes; check the pricing arithmetic first, because external portal users are charged separately and that is where the bill grows.

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.

Stacker: Will it replace Airtable?

No, it sits in front of Airtable. If the base itself is at its limits, the fix is moving the data to Postgres rather than changing the portal.

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