Grammarly provides Android and IOS apps whereas ProWritingAid doesn't have a mobile or IOS app.
Instead of filtering syscalls to the host kernel, gVisor interposes a completely separate kernel implementation called the Sentry between the untrusted code and the host. The Sentry does not access the host filesystem directly; instead, a separate process called the Gofer handles file operations on the Sentry’s behalf, communicating over a restricted protocol. This means even the Sentry’s own file access is mediated.
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It’s time to pull the plug on plug-in hybrids