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Formstack alternatives · Forms

Open-source alternatives to Formstack

Formstack is not described as open source on its own site. 5 of the 30 other form and survey tools in this directory are open source, according to their own sites.

Formstack is a paid product with a free trial, starting at $83 per month, paid annually ($99 billed monthly). All of them are free or have a free plan.

5 tools · Listings checked up to Oct 9, 2026 · Where the facts come from

How each one differs from Formstack

  1. HeyForm

    Open-source builder for conversational forms and surveys

    • HeyForm starts at $15 per month, billed annually ($18 billed monthly). Formstack starts at $83 per month, paid annually ($99 billed monthly).
    • HeyForm has a free plan. Formstack does not, though it has a free trial.
    • HeyForm is open source and self-hostable, according to its own site.
    • HeyForm also covers surveys.
    HeyForm pricing and details

  2. Formbricks

    Open-source survey platform for links, websites and apps

    • Formbricks starts at $74 per month, billed annually ($89 billed monthly). Formstack starts at $83 per month, paid annually ($99 billed monthly).
    • Formbricks has a free plan. Formstack does not, though it has a free trial.
    • Formbricks is open source and self-hostable, according to its own site.
    • Formbricks also covers surveys.
    Formbricks pricing and details

  3. OpnForm

    Open-source form builder with unlimited submissions

    • OpnForm starts at $25 per month, billed yearly ($299); $29 billed monthly. Formstack starts at $83 per month, paid annually ($99 billed monthly).
    • OpnForm has a free plan. Formstack does not, though it has a free trial.
    • OpnForm is open source and self-hostable, according to its own site.
    • OpnForm also covers surveys.
    OpnForm pricing and details

  4. LimeSurvey

    Open-source survey tool, hosted in the cloud or self-hosted

    • LimeSurvey starts at $39 per month, billed monthly (charged in EUR, about €34). Formstack starts at $83 per month, paid annually ($99 billed monthly).
    • LimeSurvey has a free plan. Formstack does not, though it has a free trial.
    • LimeSurvey is open source and self-hostable, according to its own site.
    • LimeSurvey also covers surveys and reports.
    LimeSurvey pricing and details

  5. KoboToolbox

    Open-source data collection for field surveys, online or offline

    • KoboToolbox starts at $21 per month, billed annually ($25 billed monthly); nonprofits have a free plan. Formstack starts at $83 per month, paid annually ($99 billed monthly).
    • KoboToolbox has a free plan. Formstack does not, though it has a free trial.
    • Only KoboToolbox lists an Android app.
    • KoboToolbox is open source and self-hostable, according to its own site.
    KoboToolbox pricing and details

Common questions

Is there an open-source alternative to Formstack?

Yes. HeyForm, Formbricks, OpnForm, LimeSurvey and KoboToolbox are open source, according to their own sites.

Is Formstack open source?

Formstack is not described as open source on its own site. The listing was checked on Oct 5, 2026 against the pages it cites.

When was this checked?

Each listing shows its own date. On this page they run from Oct 5, 2026 to Oct 9, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Formstack: the alternatives its listing names first, then the tools that share the most features with it.