Our Testing Method
We wrote Instagram captions, X threads, LinkedIn posts, and TikTok scripts with each tool for 30 days. We judged hook strength, authenticity, and whether each post would stop the scroll.
Which Should You Pick?
- Best value for social: Rytr — $7.50/mo, built for short-form
- Best free: ChatGPT or Claude — excellent with good prompts
- Best for bulk + SEO: Writesonic — $20/mo
How to Write Social Posts That Convert
- Give the AI your voice: Paste one of your best past posts as a style reference
- Specify the platform: "Instagram caption" beats "social media post"
- Set a constraint: Length, tone, one CTA, no emojis — whatever fits your brand
- Write hooks first: Ask for 5 first-line hooks, pick the strongest
- Repurpose: One long post → thread + carousel + email teaser
Want the prompts, organized?
The E-Commerce Copy Pack — 50+ tested prompts including social media. $9.99 one-time.
Get the E-Commerce Copy Pack →Frequently Asked Questions
What is the best AI tool for social media captions?
Rytr for value; ChatGPT/Claude for free quality.
Can AI write good social media posts?
Yes — short-form is where AI excels, with the right prompts.
Is there a free AI writing tool for social media?
Rytr free plan + ChatGPT/Claude free tiers.
What is the best way to write social media with AI?
Give the AI a role, your voice sample, the platform, and a specific CTA.