AI Image Generation

Let your app create images from a text prompt - avatars, logos, stickers, artwork, product mockups. No API key, available on every plan.

What is AI Image Generation

A built-in service that turns a written description into an image. Ask for "an avatar generator" or "a logo maker" in chat and GenMB wires it into your app. It works the same in the live preview and in your deployed app.

This service creates new images. To describe, read, or answer questions about an image the user uploads, your app uses Image AI instead (see Services & SDKs).

How to Use

Generated apps call the SDK that GenMB injects. It resolves to a data URL you can put straight into an image tag:

const src = await window.genmb.ai.generateImage('a friendly fox mascot, flat illustration', {
  size: '1024x1024',   // or '1024x1536' (portrait), '1536x1024' (landscape)
  quality: 'medium',   // or 'low'
  transparent: false,  // true returns a PNG with no background
})
img.src = src

Only generate when the user presses a button. Never on page load or in a loop: every call costs a credit.

Limits and Credits

1 credit per image, charged to the app owner, only when an image is returned.
Per app: 20 images per hour, 100 per day, and 2 at the same time. Over the cap the SDK throws an error with code RATE_LIMITED.
When the owner is out of credits the SDK throws an error with code INSUFFICIENT_CREDITS.
Prompts up to 4,000 characters.

FAQs

Who pays for the images?▾

You, the app owner. Each image costs 1 credit from your balance, including images made by visitors of your public app. On the Free plan (8 credits a day) that is about 8 images a day; after that your app gets an out-of-credits error until your credits refill or you upgrade.

How long does an image take?▾

Usually 20-30 seconds. Show a loading state and disable the generate button while it runs.

What happens if a prompt is blocked?▾

Prompts that break the image safety policy are refused with a "blocked by the image safety filter" message, and no credit is charged. Ask the user to rephrase.

Can I get a transparent background?▾

Yes. Pass transparent: true and you get a PNG with no background, which suits logos and stickers. Otherwise images come back as JPEG to keep them small.

Ready to build?

Create your first app for free, no credit card required.

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