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Based on weighted criteria below
Pricing icon

Pricing (weighted 12%)

Formstack

Silver: $39/month

The starter plan lots of features like a drag and drop form builder, conditional logic, CSS and themes, 5 users, mobile apps, save & resume, security and email support and much more. All of this if you need to create under 20 forms with maximum 1000 submissions per form every month.

Gold: $99/month

With this plan you'll get a few more integrations (Hubspot, Google Analitycs and Salesforce), 10 users and you can build up to 100 forms with 10,000 for each form every month.

Platinum $249/month

This plan includes more advanced features like AB testing but you are limited in number of forms and submissions. Nevertheless it bumps up the number of forms to 1000, the monthly submissions per forms to 100.000 and the number of logins per account to 25.

There is no free plan but they have a 14 day free trial. You can also request a 20 minute demo that includes tutorials and tips to help you get started.

The features are pretty attractive but the maximum submissions per month might be a problem.

They offer 2 months free when you pay annually.

Ninja Forms

Personal Plan: $99

This one is going to offer more features like Conditional Logic, File Uploads or Multi-Part Forms. Plus, you get 20% off for any additional adon installed. Depending on how many add-ons you choose and how many websites you own the price will vary. All of this for 1 site with 1 year of updates and support.

Proffessional Plan: $199

This plan includes 40% off aditional add-ons witch may be installed on up to 20 sites, plus even faster support email response times (8 business hours).

Agency Plan: $499

With the Agency Membership you'll have access to all 40 add-on that Ninja Forms sells at this moment, priority email response (4 business hours), Live / Screenshare support, access to the Builder PRO Pack, PDF form Submissions and integrations with popular online services like MailChimp, Salessforce, PayPal or Zapier.

Ninja Forms are only available for WordPress.org sites. If your site is not built on WordPress go with Wufoo.

Keep in mind that for all plans you will get a full year of support and updates from the date of purchase. If you wish to continue getting support or updates after one year you will have to renew your subscription.

You'll only get 30 day refunds for individual extensions but the bundle purchases cannot be refunded.

Design icon

Design (weighted 12%)

Formstack

All forms are completely responsive and there are a enough templates available to get you started. The designs have a modern look and will easily integrate into your website design but if you wish to customize your themes HTML and CSS skills will be needed.

 

Ninja Forms

Ninja Forms have a clean and simple design. There are no form templates available at this moment. Customization is possible, altough not on a deep level, but is enough to integrate the forms with your website design.

If you wish to customize your design a drag and drop editor is available but being already familiar with the WordPress interface might help.

Features icon

Features (weighted 12%)

Formstack

Starting with the Silver plan you'll get access to all the basic features, like the WYSIWYG Drag and Drop editor, CSS and Themes, Conditional Logic, Multiple Users, Mobile, Apps, Save & Resume, Basic Integrations,  Electronic Signatures, Form Analytics, Field Validation and Payment Processors.

Formstack is available for any platform so if you're not running a WordPress site this might be the choice. Another big plus is that you are only limited by the number of forms and submissions, so the forms you create can be used on more that one website.

 

Ninja Forms

Most of Ninja Forms' features are available as add-ons: conditional logic, multiple forms, file uploads, login customization. Check pricing to see exactly how many add-ons are included in every plan. If you need more features but want to stay on budget go with Formstack.

Frontend posting is a great feature that allows you to create posts, pages, or custom post types from user input.

Backend Features icon

Backend Features (weighted 12%)

Formstack

Formstack has a clean and uncluttered administration interface with a fresh and modern design.

In the backed you'll be able to access your Dashboard which contains reports like unique forms visits and conversion rates. In the Forms section you can organize your existing forms or create new ones. The next section is
Learn Formstack - an overview of every single walkthrough available to you, organized by category and difficulty level.

Ninja Forms

Being a WordPress plugin, Ninja Forms embeds itself into the backend of the CMS. If you are familiar with WordPress you'll have no trouble creating your forms.

Just select New form to access the drag and drop form builder. The add-ons and extensions will also be available under the Forms menu.

Extensibility icon

Extensibility (weighted 12%)

Formstack

Formstack has many web app integrations available for payments, data collection, email lists, advanced analytics insights all arranged in categories.

You will not be charged for third-party integrations usage so if you are planning to use lots of these apps go with Formstack.

Dropbox, Aweber, MailChimp, Facebook, Google Analytics, PayPal are some of the most popular integrations.

Ninja Forms

Ninja Forms integrates with the most popular email marketing app like AWeber, MailChimp or Constant Contact, GetResponse or iContact so you can quickly create newsletter signup forms.

A huge list of integrations like PayPal Express, Zoho CRM, Stripe and many others is available.

If you need too many of these add-ons Ninja Forms could get on the pricey side so you might consider Formstack.

Flexibility icon

Flexibility (weighted 12%)

Formstack

You can export all of your data or manually choose what data to export in CSV, RTF (Word), Excel, or PDF format.

With the Formstack iOS and Android app, you can take and process orders, collect or see sales contacts, and take survey information.

Ninja Forms

All the add-ons available make Ninja Forms a very flexible form builder but at the same time if you are planning on using too many of these extensions the service will get a bit costly.

Using the Excel Export add-on you can export Ninja Forms submissions to an Excel file.

Statistics icon

Statistics (weighted 12%)

Formstack

For every form some basic analytics data is avalaible: Unique Views, Conversions, Conversion Rate, Abandonments, Abandonment Rate. For more advanced analytics data the Google Analytics integration is available.

Ninja Forms

The User Analytics extension will help you collect data about users who submit your forms.

You’ll also be able to capture the OS, IP address, Browser & Version. If the user’s IP is in the database you’ll also be able to see the Country, Region, Postal Code and City.

Support icon

Support (weighted 12%)

Formstack

Formstack offer support aver Email and  Live Chat. DIYers are able to access the Support Center with a decent knowledgebase (with walkthroughs and video tutorials available), community help Forum (not very active)  and a Blog (very active) as well are available.

All these support features are even available at the Free level.

Ninja Forms

Ninja Forms also provide a extensive knowledge base and very good documentation. They offer support via email, with different response times, depending on the subscription (from 24 business hours for the free plan to 4 business hours for users with pro mebership).