Formstack Online Forms
This plugin allows you to easily embed Web forms built with Formstack's online form builder into your sidebar, pages, and posts.
Consider an alternative
Formstack Online Forms shows warning signs in 2026 — compare the alternatives below before installing. It runs on 1K+ sites, is rated 2.5/5 and was last updated 7 years ago, and scores 29/100 on our health check.
- Low rating so far — 2.5/5 from only 8 reviews
- No update in 7 years
- Only tested up to WordPress 5.1 (latest is 7.1)
How does it stack up?
Side-by-side on installs, updates, ratings & support
Daily downloads
Download spikes usually follow a new release — each site that auto-updates counts as a download.
Rankings
Where Formstack Online Forms stands todayWordPress.org search rankings
Live position in the plugin search, top 100| Keyword | Position |
|---|---|
| form builder | >100 |
| forms | >100 |
| lead generation | >100 |
| online forms | >100 |
| Web Forms | >100 |
Version adoption
Share of active sites per release.
Rating breakdown
★★★★★★★★★★ 2.5 from 8 reviews
About Formstack Online Forms
From the official readme · v2.0.2Description
Formstack’s WordPress form plugin makes it quick and easy to embed contact forms, lead generation forms, payment forms, and more on your WordPress blogs and websites. Build customized online forms in seconds with our drag-and-drop interface, and integrate with 40+ third-party apps, including Salesforce, MailChimp, and PayPal.
This plugin features two components:
- Formstack Widget
- Formstack Plugin
The Formstack widget allows you to embed Formstack web forms into your sidebar. The widget automatically optimizes the web form’s CSS to make your online forms fit and look great on your WordPress pages.
The Formstack Plugin adds a button to the TinyMCE editor that allows you to easily select the Formstack web form you wish to embed. Once a form is selected, a shortcode will be inserted into the editor, which will be converted to the selected form once your page or blog post is rendered.
This plugin supports the following shortcodes [Formstack], [formstack], and [fs].
A Formstack account and API key are required. Signup for free today!
Installation
- Download the plugin zip file by clicking “Download” in the upper right corner of the page.
- Upload Formstack.zip via the Upload link in the WordPress plugins dashboard.
- Activate the Formstack Plugin through the “Plugins” menu in WordPress.
Changelog
Fixed: Errors with unauthenticated accounts and trying to use API in widget.
2.0.2
- Fixed: Errors with unauthenticated accounts and trying to use API in widget.
2.0.1
- Fixed: Adjusted timeout value to 120seconds for API requests to accommodate for large responses.
2.0.0
- Added: Embed options when choosing a form. Conditionally include jQuery, jQueryUI, Modernizr, and Formstack-provided CSS.
- Added: options to clear/refresh cached Formstack lists in your WordPress admin.
- Updated: Make the plugin use Formstack API V2 API over the older V1.
- Updated: Removed the embedding of Formstack account admins within WordPress admin page.
1.0.13
- Increased timeout limit for API requests.
- Conditionally loading content meant for TinyMCE.
- Added caching for API requests. Will especially help those who have large amounts of lists.
- Improved handling of cases where API requests return no lists.
1.0.12
- Fixes js bug with empty forms array when inserting form into post.
1.0.11
- Reworked and updated plugin to current WordPress standards
- Confirmed compatibility with latest WordPress versions.
For developers
Is this your plugin? Show off the numbers.
Add a live badge to your site, docs or GitHub README. It updates on its own — no account needed.
Best Formstack Online Forms alternatives
All form builder plugins →
FAQ
Formstack Online Forms: quick answers
Straight answers, pulled from live WordPress.org data.
Live data from WordPress.org · checked Sep 28, 2026
Is Formstack Online Forms free?
Yes. Formstack Online Forms is free to download and use from the official WordPress.org plugin directory.
Is Formstack Online Forms safe to use in 2026?
Formstack Online Forms shows warning signs in 2026 — compare the alternatives below before installing. It runs on 1K+ sites, is rated 2.5/5 and was last updated 7 years ago, and scores 29/100 on our health check.
How many websites use Formstack Online Forms?
Formstack Online Forms is active on 1K+ WordPress websites and has been downloaded 84,844 times since it launched in September 2010. It was downloaded 432 times in the last 30 days.
Does Formstack Online Forms work with WordPress 7.1?
Formstack Online Forms is officially tested up to WordPress 5.1.26, while the latest release is 7.1.2. It may still work, but try it on a staging site first.
When was Formstack Online Forms last updated?
The latest version, 2.0.2, was released on April 12, 2019 (7 years ago).
Who makes Formstack Online Forms?
Formstack Online Forms is developed and maintained by mmattax.
What are the best alternatives to Formstack Online Forms?
The most popular alternatives to Formstack Online Forms are WPForms (5M+ installs), Fluent Forms (700K+ installs) and MetForm (600K+ installs).
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