WProofreader SDK

A combo of pre-built components for WYSIWYG editors such as CKEditor, Froala, TinyMCE, Quill.js, and standalone HTTP API helping development teams enrich web apps and custom systems with proofreading and rewording functionality.

Multilingual sentence corrector

Proofread spelling and grammar, improve your writing style in 20+ languages. Enjoy spelling autocorrect and autocomplete suggestions.

AI paraphrasing tool

Try WProofreader AI writing assistant 🪄 Play with the size and style of your texts, summarize key ideas and proofread.



Data in transit is encrypted with TLS protocol. GDPR-compliant. On-premise deployment is for security-conscious businesses.

We love when our clients enjoy our products. So we take every client’s need as our own.


We respond within a business day to all sales and tech requests and provide guided installation in case it’s needed.

Multilingual writing assistant

WProofreader checks grammar and spelling in English, German, Spanish, French and more languages.  

Take your writing to the next level with automatic language detection and spelling autocorrection. Speed up business communication  with autocomplete suggestion and stay aware of non-inclusive or profanity choices in English, German, Spanish and French. 

Delegate the tedious paraphrasing job to WProofreader AI writing assistant. Transform your texts in different ways: shorten, expand, rewrite, improve style, make them sound more formal or informal, summarize key ideas and proofread. For cloud product versions only.

Create company-wide and user dictionaries with industry terminology, acronyms, and proper names, or use specialized law and medical dictionaries that cover the specifics of your niche.

Check language demos ›

Highly secure

Alongside continuous availability and product improvement, data security and privacy remain our focal point.

Our infrastructure is run on AWS with data centers in the US East region. Client data in transit is protected using HTTPS with the TLS 1.3 protocol. Data at rest is encrypted using AES-256 server-side encryption.

On-premise deployment implies that all client data is processed on the client servers – in private cloud or physical.

WebSpellChecker solutions are GDPR-compliant and help you achieve the HIPAA standard.

Discover more ›

Accessible and customizable

WProofreader is compliant with WCAG 2.1 and Section 508 accessibility standards, which makes it convenient for all users, regardless of the limitations they might be facing.

WProofreader comes with keyboard navigation, and its UI is designed to be universally readable.

WProofreader is an absolutely plug-and-play solution. Tweak it effortlessly to meet your business needs: choose the primary language, set UI localization, disable tabs in settings, extend user dictionaries, personalize the look with “gray”, “dark” and “custom” themes.

On-premise version offers even more room for personalization.

Request a VPAT report ›

Integrations and HTTP API

WProofreader SDK is predefined JavaScript components for spelling and grammar correction in RTEs and HTML editable elements, which can be a part of Angular, React, TypeScript and Vue.js web apps.

Drupal users can also deploy WProofreader for text check as a part of CKEditor 5 Premium Features module and CKEditor 5 Plugin Pack under free access.

We offer a standalone WProofreader HTTP API for those clients who want to build an application or platform with custom UI and behavior and equip it with proofreading functionality.

With a set HTTP API commands, you can access the application core and unleash its power.

Learn more and try demo ›

Frequently asked questions

The on-premise licensing is particularly suitable for companies with enhanced security requirements, since it allows all the proofreading requests to be processed within your own servers. The cloud plans eliminate your infrastructure and maintenance costs for proofreading engine, ensuring quick start within your current setup.

If you still hesitate, feel free to get in touch with us. We will be happy to schedule a call with you to discuss the most suitable solution for you.

If you end up exceeding the limit, the service will stop working. However, our team monitors the usage, and notify customers beforehand with the proposal to purchase another set of words. In this case, the price depends on the potential customer usage (per year) and the price of the appropriate usage plan.

Please see the complete Terms of Service for the cloud services. Also, we have an extensive Privacy Policy in place to protect your and your end users’ texts. Please see the details here.

Please check the Software License Agreement which contains the complete terms and conditions for downloading, installing and using the on-premise version of the WebSpellChecker solutions.

According to Commercial License Fees and Warranties clauses of our standard Software License Agreement, you have an option to request a refund of your commercial server license up to 30 days after the original date of purchase. However, such a refund option is possible only in case WebSpellChecker software breaches the given warranty.

After the 30-day period after the original date of purchase, refunds will not be available. To request a refund within 30 days of payment, please contact our sales team.


By default, WebSpellChecker doesn’t offer any discounts. Our goal is to build reliable and quality products available at the best price and to treat every customer equally. The prices are available for everyone so there’s no guessing or uncertainty around what you’re buying and how much it costs.

We do offer our customers Data Processing Addendum, it forms a part of Terms of Service. Here you can find all the materials related to our commitment and compliance with GDPR.

In order to request a quote or an invoice, please contact our sales team by specifying your order information.

WProofreader is an alternative product for the SpellCheckAsYouType (SCAYT) plugin enabling  extra functionality and more convenient and freshly looking user interface with flexible customization options. When migrating from SCAYT to WProofreader you still get access to the same set of features. Moreover, both SCAYT and WProofreader use the same engines, thus providing the same quality of spelling or grammar check. 

You can use WProofreader in:  

  • CKEditor 4 as well as for other text editors, for example, CKEditor 5, TinyMCE 4/5, Froala Editor, TinyMCE, Quill, Kendo UI (see the demos on our website), 
  • HTML editable controls such as input and textarea
  • Elements with a contenteditable attribute such as div, iframe, and others.

WProofreader advantages:

  • Modern UI, faster performance, and improved usability.
  • More options for UI and behavior customization for both on-premise and cloud versions.
  • Spelling autocorrect and autocomplete suggestions features for advanced proofreading.
  • Proofreading in a separate dialog mode convenient for large texts.
  • Until now, it was required to purchase subscriptions for two separate products when using SCAYT and WebSpellChecker Dialog (WSC) plugins. After migrating to WProofreader as-you-type mode of SCAYT plugin and dialog mode of WSC, their features are available now in one product. 

WProofreader cons:

  • You need to add configuration scripts on your page where proofreading is required; 
  • Since WProofreader has a different user interface, users may need some time to familiarize themselves with the badge icon and proofreading options and commands available.