A Harvard business School student has built a viral AI writing tool that is being described as the opposite of Grammarly—instead of improving grammar, it intentionally makes writing look more human and less polished.
🧠 What is the tool?
The tool is called “Sinceerly” and it is a Chrome extension that rewrites text to add imperfections on purpose.
It was created by Ben Horwitz, a Harvard student, who designed it after noticing that:
- AI-generated text is often too perfect
- AI detection tools flag overly polished writing
- People are now trying to “sound more human” rather than perfect
⚙️ How it works
Unlike Grammarly, which corrects writing, Sinceerly does the opposite:
✍️ It deliberately:
- Adds small typos
- Makes sentences more casual or “messy”
- Removes overly formal tone
- Sometimes inserts email-style endings like “sent from my iPhone”
🎛️ Different modes
The tool includes multiple writing styles:
- Subtle mode → lightly simplifies and adds minor human-like changes
- Human mode → makes writing more conversational and less polished
- CEO mode → extremely short, informal, sometimes all lowercase
🤖 Why it is called “anti-Grammarly”
Grammarly:
- Fixes grammar
- Improves clarity
- Makes writing professional
Sinceerly:
- Adds imperfections
- Makes writing look human-made
- Helps avoid AI detection systems
That’s why people are calling it an “anti-Grammarly” tool.
💡 Why it exists
The creator built it because:
- AI-generated writing is becoming very common
- Employers and teachers sometimes distrust perfect writing
- AI detectors can wrongly flag clean human writing
So the idea is to make text feel naturally imperfect again.
💰 Pricing
- Offers limited free usage
- Paid version costs around $4.99 after trials
🧾 Final takeaway
👉 The Harvard-built tool Sinceerly is going viral because it flips Grammarly’s idea completely.
Instead of making writing perfect, it makes it intentionally imperfect to feel more human.
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