redpen

<a href="http://redpen.cc" rel="nofollow ugc">RedPen</a> is a proofreading tool to help writers or programmers who write technical documents or manuals that need to adhere to a writing standard. This plugin integrates text validation provided by <a href="http://redpen.cc/docs/latest/index.html#server" rel="nofollow ugc">RedPen Server</a> into the WordPress editor.
<h3>Features</h3>
<ul>
<li>Validates text with RedPen as you type</li>
<li>Supports both Visual and Text WordPress editors</li>
<li>Validation errors are marked in Visual editor in-place</li>
<li>Validation error messages are also listed below and highlighted in the editor on click</li>
<li>Autodetection of supported languages and variants (currently, English or Japanese)</li>
<li>RedPen <a href="http://redpen.cc/docs/latest/index.html#validator" rel="nofollow ugc">validators</a> and <a href="http://redpen.cc/docs/latest/index.html#setting-symbols" rel="nofollow ugc">symbols</a> 
can be configured directly in WordPress panel below the editor</li>
<li>Configuration is stored for next visit with the same browser</li>
</ul>

RedPen WordPress plugin

This plugin integrates RedPen text validation into the WordPress editor.

Perfect Tense

Perfect Tense is an AI-powered, spelling and grammar corrector. Perfect Tense will automatically detect and fix mistakes, proofread entire blog posts, and even block low-quality posts and comments.
What does the Perfect Tense plugin allow you to do?
<ul>
<li>Automatically correct all posts Save time by having Perfect Tense automatically correct and update all selected posts with the click of a button.</li>
<li>Assess grammar quality Sort all posts by their 0-100 grammatical quality so you know which posts are ready to publish and which need more attention.</li>
<li>Proofread individual posts Visualize all mistakes in an individual post, giving you complete control over which changes are applied.</li>
<li>Correct all future posts Whenever you set a post to be published, Perfect Tense will automatically proofread and correct any errors.</li>
<li>Flag future posts for review For more control, Perfect Tense will flag posts with grammar mistakes so they can be proofread one more time before they are published.</li>
<li>Flag low quality comments Set any grammar score threshold you want to mark low quality comments as spam.</li>
</ul>

Perfect Tense – Spelling and Grammar Checker

Perfect Tense is an AI-powered, spelling and grammar corrector. Perfect Tense will automatically detect and fix mistakes, proofread entire blog posts, …

RedPen WordPress plugin vs Perfect Tense – Spelling and Grammar Checker