Incognito mode in Google Chrome is a feature that everyone knows and uses. It doesn’t store any information of the browsing site nor saves the sites you visit in the history of the browser.
SwiftKey, one of the alternatives to Regular smartphone keyboard and alternative to Gboard has recently pushed a beta version of the App having this same mode. It’s awesome that the Microsoft acquired Swiftkey is doing its best to tackle with the Google Keyboard.
You can get this auto-switching to the incognito mode by downloading the beta version of the app from the Play Store or from other trusted source. But we suggest you download it from Google Play store only to avoid any harm to your device.
Remember that the app is still in beta and you might be facing some bugs here or there, So if you are shifting towards the beta version, be aware of the bugs it might come with.