Grammarly
Grammarly catches basic errors free, then shows you a better suggestion blurred out behind a paywall. Curiosity does the selling. 37 million daily users, 3 million paying, 85 percent gross margin on pure software.
Grammarly checks your writing for free. Basic spelling and grammar, unlimited, no payment required. 30 million people use it daily. Then, Grammarly offers a suggestion it will not show you unless you pay. The premium suggestion appears blurred. Clearly there, but unreadable. Curiosity does the selling. The free tier catches obvious errors. Premium at $12 monthly catches tone, clarity, and delivery issues. It rewrites sentences. It adjusts formality. Free tells you the sentence is wrong. Premium tells you why and offers three alternatives. That blurred suggestion on screen is the most effective conversion mechanic in consumer SaaS. By 2023, Grammarly had 37 million daily users and revenue exceeding 200 million.
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