RendrKit: The Open-Source Alternative to Bannerbear

If you've ever needed to generate images programmatically - social media cards, OG images, blog headers, infographics - you've probably come across Bannerbear. Bannerbear is solid. You design a template, call their API, get an image back. They're doing around $40-50K MRR, plans start at $49/mo, and they've earned it. Placid and HTMLCSStoImage do similar things in slightly different ways. But I kept running into the same friction: I didn't want to design templates from scratch every time. I didn't want to pay $49/mo just to experiment. And most importantly - I was building AI agents that needed to generate images, and none of these tools were built with that in mind. So I built RendrKit. What RendrKit does differently RendrKit is a Design API for AI Agents. Not just image generation - AI-native image generation. Here's what that means in practice: 80+ templates built-in - no need to design anything before your first API call MCP server - AI agents can discover and use templates directly