PostGen vs. Buffer AI Assistant: Which Free AI Post Generator Fits You?

PostGen vs. Buffer AI Assistant

If you've been comparing free AI tools for social media, you've likely come across both PostGen and Buffer's AI Assistant. They sound similar on the surface — both use AI to help you create social posts. But they're built for fundamentally different use cases.

What is Buffer AI Assistant?

Buffer AI Assistant is a caption-writing tool built into the Buffer scheduling platform. When you're creating a post in Buffer, the AI Assistant can suggest captions based on your topic. It's convenient if Buffer is already your scheduling tool.

Key limitation: Buffer AI Assistant only writes captions — it doesn't generate images. And it requires a Buffer account (even the free plan requires registration).

What is PostGen?

PostGen is a standalone AI post generator that creates both the image and the caption together, from a single prompt. You describe your post, pick your platform and tone, and get a complete, ready-to-post result — image included.

Key difference: PostGen requires zero account creation. You generate, download, and leave.

Feature comparison

Which should you use?

Choose PostGen if:

• You want a complete post (image + caption) without signing up for anything
• You don't currently use Buffer
• You need platform-correct image dimensions automatically
• You want the fastest path from idea to ready-to-post content

Choose Buffer AI Assistant if:

• You're already using Buffer to schedule your social media
• You already have images and just need caption help
• You want to generate and schedule in one workflow

The bottom line

They solve different problems. PostGen is a complete post generator — you go from nothing to a finished post. Buffer's AI Assistant is a caption helper within an existing scheduling workflow. Many social media managers use both: PostGen for fast content creation, Buffer for scheduling.