Prodia - Add Generative AI into your App
app.prodia.com
Easy-to-use Stable Diffusion API for AI-powered image generation at 90% lower cost than AWS. Effortless scale with no infrastructure worries.

Found this online tool to try out a bunch of different text2image models for free. No signup needed. Resolution is fixed to 512x512, but otherwise it’s pretty versatile for being free