Nobody compares Grammarly and Replit AI head to head. They should.

I treated both like sources and checked their work, not their pitch.

People call Grammarly the safe pick. In practice the useful features sit behind the paywall Replit AI, by contrast, codes and deploys from the browser.

What Grammarly does best: catches grammar and tone in real time everywhere its rephrase suggestions are genuinely useful

The catch on Grammarly: the useful features sit behind the paywall And Replit AI? debugging through a tab is limiting

If I had to keep one, it's Grammarly — catches grammar and tone in real time everywhere. But Replit AI earns its spot the moment codes and deploys from the browser. Neither is dead weight; they just aren't the same tool.