Ninja Forms – The Contact Form Builder… vs Formstack Online Forms (2026)
Detailed side-by-side comparison of two WordPress plugins, based on real-time data from WordPress.org.
Ninja Forms – The Contact Form Builder…
600K+ active installs
Free
Quick Verdict
As of April 2026, Ninja Forms – The Contact Form Builder… has a higher user rating (4.4/5 from 1,388 reviews) and leads in active installations (600K+ vs 1.0K+). Both are free WordPress plugins. Ninja Forms – The Contact Form Builder… has accumulated 59M+ total downloads while Formstack Online Forms has 82K+.
Detailed Comparison
| Metric | Ninja Forms – The Contact Form Builder… | Formstack Online Forms | |
|---|---|---|---|
| Rating | 4.4/5 | ◄ | 2.5/5 |
| Total Reviews | 1,388 | ◄ | 8 |
| Active Installs | 600K+ | ◄ | 1.0K+ |
| Total Downloads | 59M+ | ◄ | 82K+ |
| Support Resolution | 67% | N/A | |
| Last Updated | 1 week ago | ◄ | 6 years ago |
| First Released | 2011 | 2010 | |
| Age | 15 years | 16 years | |
| WP Requires | 6.7+ | 2.8+ | |
| PHP Requires | 7.4+ | false+ | |
| Business Model | Free | Free | |
| Latest Version | 3.14.2 | 2.0.2 |
Rating Breakdown
Ninja Forms – The Contact Form Builder…
Formstack Online Forms
Download Trends
Over the past 30 days, Ninja Forms – The Contact Form Builder… averaged approximately 12,536 daily downloads while Formstack Online Forms averaged 9.
Recent Reviews
Ninja Forms – The Contact Form Builder… Reviews
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Great plugin and good support
We have been using this for a while and found it to be excellent. Recently had a problem which their support quickly proposed a solution for that related to how another plugin was set up.
Stupid popup prompt for rating
Stupid popup prompt for rating This topic was modified 1 week ago by esrahh.
Formstack Online Forms Reviews
doesn’t work just errors out
For a system that asks a lot of money for their service, you would think they would keep their features up to date. Nope. Can’t use this plugin, it just errors out. Can’t even use their embed javascri
Not impressed – nothing works properly
It seem like you guys are trying to do too many things, but nothing works properly. Signed up with Formstack, your Drupal extension doesn’t work, this WordPress extension doesn’t work either. It sends
Doesn’t Work
The previous plugin worked fine. This won’t authenticate and won’t allow me access to my forms. When saving new API and client ID it gives me this: Warning: Invalid argument supplied for foreach() in
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Frequently Asked Questions
Is Ninja Forms – The Contact Form Builder… or Formstack Online Forms more popular?
Which has better ratings — Ninja Forms – The Contact Form Builder… or Formstack Online Forms?
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Plugin data sourced from WordPress.org. Comparison and analysis by PluginSift.