Choosing between Grammarly and Writesonic for your agency? Both are popular choices. Grammarly starts at Free / $12+/mo and is best known as AI writing and grammar assistant for polished client work. Writesonic starts at Free / $16+/mo and is AI writer with built-in SEO and brand voice. Below is a side-by-side breakdown of features, pricing, pros, and cons to help you decide which fits your agency's workflow and budget in 2026.
Gr
Grammarly
AI writing and grammar assistant for polished client work.
Free / $12+/mo
👍 Pros
- Team style guides
- Works everywhere you type
- Reliable quality control
👎 Cons
- Not a content generator first
- Business plan needed for teams
Ws
Writesonic
AI writer with built-in SEO and brand voice.
Free / $16+/mo
👍 Pros
- Affordable entry price
- Built-in SEO checks
- Bulk generation
👎 Cons
- Quality varies by topic
- Credit-based limits