GrammarChecker.net might be a bit more popular than Slack Themes. We know about 1 link to it since March 2021 and only 1 link to Slack Themes. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Check out https://slackthemes.net/ for some ideas. You can the copy paste the values to your preferences in Slack to make use of theme. Source: about 3 years ago
Try the Grammarly extension or this online grammar checker. Source: almost 2 years ago
Sweet Themes - Color Themes for Slack
Grammarly - Clear, effective, mistake-free writing everywhere you type.
Best Of Themes - The simplest way to browse thousands of website themes
Outwrite.com - Write better everywhere with Outwrite's proofreading and paraphrasing tool.
Branded Slack Themes - 1,000+ themes to customize your Slack
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.