Why I did this so you don't have to
There are hundreds of AI writing tools out there. Every week a new one launches promising to "10x your content output." Most of them are just a thin wrapper around GPT-4 with a $49/month price tag.
I spent five weeks testing five tools — one per week — using each for real work: blog posts, emails, product descriptions, and social captions. Here's what I found.
The 5 tools I tested
- ChatGPT (GPT-4) — the obvious starting point
- Claude — Anthropic's model, known for longer context
- Jasper — purpose-built for marketing teams
- Copy.ai — popular for short-form content
- Writesonic — the budget-friendly option
What I actually tested them on
I gave each tool the exact same five prompts: a 1,000-word blog post, a cold email sequence, a product landing page, five Twitter threads, and a 30-day content calendar.
The results (honest version)
ChatGPT was the most flexible but needed the most prompt engineering. Raw output was often generic — you had to push it.
Claude surprised me. Longer outputs felt more natural and it followed complex instructions better than any other tool. Best for long-form.
Jasper has great templates and brand voice features. If you're a marketing team managing multiple brands, it's worth the cost. For solo creators — probably not.
Copy.ai was fastest for short punchy copy. Headlines, CTAs, subject lines — it nailed them. I wouldn't use it for anything over 300 words.
Writesonic got the job done for SEO blog drafts. It's not the most polished but the output-to-price ratio is hard to beat.
The verdict
If I could only keep one: Claude for long-form, Copy.ai for short-form. The winner really depends on what you're writing, not which tool has the best marketing.