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Which AI should I use to write social media posts?

For posts that sound like you, the big chat AIs beat most 'AI caption' apps. Claude is best at matching your voice, ChatGPT and Meta AI can add the image, and Grok knows what's being said on X right now.

Which AI does this best

  1. Claude
    AI assistantFree plan
    #1

    Best at sounding like a person, and like you specifically: paste 3 of your old posts and it picks up your rhythm and words. It can't make images, so pair it with Canva or ChatGPT for visuals.

    ✦ Try this prompt
    Here are 3 posts I wrote that did well: [paste posts]. Study my tone, sentence length and words I use. Now write [3] versions of a [Instagram / LinkedIn] post about [topic] for [audience]. Rules: a first line that makes people stop scrolling, short paragraphs, no hashtags in the text, max 3 at the end, one clear question or call to action. Don't use words I'd never say.
    Open Claude ↗
  2. ChatGPT
    AI assistantFree plan
    #2

    Solid all-rounder that writes the post and makes the image in the same chat. Its default tone is a bit polished, so give it examples and ask it to cut the clichés. The free plan only allows a few images a day.

    ✦ Try this prompt
    Write a [LinkedIn / Instagram] post about [topic] for [audience]. Angle: [personal story / tip / opinion]. Max [150] words, short lines, a strong first sentence, one question at the end. Avoid buzzwords and emoji spam. Then create a matching square image: [describe the image], with the text "[short headline]" on it.
    Open ChatGPT ↗
  3. Grok
    AI assistantFree plan
    #3

    Has live access to X, so it's the one to ask what people are posting about a topic today and what's getting replies. Its writing is punchier but less careful, so read it before posting.

    ✦ Try this prompt
    Look at what people on X are saying about [topic] in the last few days. Tell me the 3 angles getting the most discussion, with example posts. Then write 5 X posts (max 280 characters each) from my point of view as [your role] that add something new to that conversation. No hashtags.
    Open Grok ↗
  4. Meta AI
    AI assistantFree
    #4

    Free and already inside Instagram, WhatsApp and the Meta AI app, so it's handy for quick captions and images on your phone. Captions are more generic than Claude's.

    ✦ Try this prompt
    Write 3 Instagram captions for a post about [topic]. My account is about [niche], my followers are [who]. Each caption: a hook in the first line, 3-5 short lines, a question at the end, 3 hashtags. Then create an image for it: [describe the photo or style].
    Open Meta AI ↗

Specialised tools

  1. Grammarly
    Free plan

    Use it as the last check before you hit publish. It catches typos and clunky lines in English.

    Open Grammarly ↗
  2. Canva
    Free plan

    Turns a caption into a finished post: templates for every format, a brand kit with your colours and fonts, and a scheduler on paid plans.

    Open Canva ↗

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