The verdict
If you run a revenue team with repeatable research and outreach steps, I'd pick Copy.ai. If your buyers ask AI tools for shortlists and you want to know whether your brand appears, I'd pick Writesonic, as long as someone owns the follow-up work.
Both have no free plan. Writesonic has a 7-day trial, so use it with your own prompts and competitors. Copy.ai needs clear steps to automate, so write them down before you buy. If all you want is a cheap AI copywriter, neither is the right buy now. A general assistant such as ChatGPT or Claude, or a simple tool like Rytr, covers plain drafting for less effort.
Side by side
| 9 points compared | ||
|---|---|---|
| Starts at | $24/mo | $79/mo |
| Free plan | No | No |
| API | Yes | Yes |
| MCP server | Yes | |
| AI content assistant | Yes | Yes |
| Brand voice / custom tone | Yes | Yes |
| Long-form editor | Yes | Yes |
| SEO optimisation | Yes | Yes |
| Team collaboration | Yes | Yes |
| Links |
Plans and pricing
Copy.ai
- Chat$29/mo
- Growth$12,000/yr
- Expansion$24,000/yr
- Scale$36,000/yr
Writesonic
- Starter$948/yr
- Basic$2,388/yr
- Growth$4,788/yr
Who each is for
Choose Copy.ai if…
Pick Copy.ai if your pain is manual, repeated work on every lead or account. Researching, enriching records, drafting outreach and keeping the CRM tidy can run as workflows with one brand voice. You can choose between models from several providers, and the integration library is broad.
It suits sales, marketing and revenue operations teams, not individual writers. Plans are aimed at teams, so match the seat count to yours. Ask who owns and supports the product, since its documentation now redirects to a Fullcast support site. Build one or two workflows first, test the outputs and keep a human check before drafts reach a customer.
Choose Writesonic if…
Pick Writesonic if AI answers are a channel you can no longer ignore. You give it prompts to track, and it shows visibility, share of voice, cited sources and how the AI describes you. Its audits flag crawler and schema issues, and its agents rewrite pages to be cited more often. It then measures the result after the fix ships.
It suits marketing and SEO teams that will act on a list of fixes. An official MCP server lets you query the data from Claude, but it needs a paid plan and a project with tracked prompts. Lower plans cap tracked prompts, articles and users, so check which AI platforms your plan covers before you buy.
Other options worth a look
Generates marketing copy with AI and predicts how well each version will perform before you publish it.