ImageApp promotional assetsIntermediateGenerates an image

App store listing background visual

A branded backdrop for store screenshots, leaving the central area free for your real UI screenshot and caption.

For: Performance marketers, Creative strategists, E-commerce marketers · Works with: OpenAI GPT Image, Google Gemini image generation (Nano Banana), FLUX (Black Forest Labs), Any image generator

Your prompt

Create a 9:16 background image for an app-store screenshot panel for a habit-tracking app for runners. Layout: leave a large central area (the middle 60% of the frame) calm and uncluttered for a real phone screenshot to be placed on top, and a clear band at the top for a caption to be added later. Decoration: faint abstract running-track lines and soft glowing dots, subtle and placed only around the edges so it frames the central area. Colour: electric blue to violet gradient with white accents, smooth gradients, no hard patterns behind the central area. Mood: energetic and motivating. Constraints: no phone mockups, no UI, no text, no logos, no store badges.

Customize

The fields start with example values so you can see how the prompt works. Everything stays in your browser.

What the app does.

Match the store's screenshot proportions.

Where the screenshot will go.

Where the caption band sits.

Edge decoration.

Colours.

Feeling.

Example of what to expect

Illustrative only. It describes the kind of result this prompt aims for; real output varies by tool, model and run.

A tall blue-to-violet gradient panel with faint track lines at the edges, an open centre for a screenshot and a clear band at the top for a caption.

Expected format: One background image; composite the real screenshot and caption yourself.

How to use it

  1. Always composite genuine screenshots; do not generate fake UI.
  2. Check each store's current screenshot size and content rules.
  3. Reuse one background style across all screenshots in a set.

Limitations

  • Store listings must represent the real app; do not generate imagery of features that do not exist.
  • Required sizes and rules change; check Apple's and Google's current guidelines.

Platform notes

OpenAI GPT Image

Official docs read · checked 2026-10-11

Aspect ratio is set with the size parameter, not in prose. Use medium or high quality for text and fine detail.

General notes on OpenAI GPT Image
  • OpenAI's guide covers gpt-image-2 (recommended), gpt-image-1.5, gpt-image-1 and gpt-image-1-mini.
  • Aspect ratio is set through the size parameter, not in prose. Quality is low, medium or high; medium or high is advised for small or dense text.
  • Put literal text in quotation marks, and when editing say what must stay unchanged.

Google Gemini image generation (Nano Banana)

Official docs read · checked 2026-10-11
General notes on Google Gemini image generation (Nano Banana)
  • Google's docs list several Nano Banana models (2.1, 2 Lite, 2, Pro) and recommend 2.1 for new projects as of the verification date.
  • Supported aspect ratios include 1:1, 4:5, 9:16, 16:9 and 21:9; sizes 1K, 2K and 4K. Up to 14 reference images per request.
  • All generated images carry a SynthID watermark.

FLUX (Black Forest Labs)

Official docs read · checked 2026-10-11

FLUX.2 does not use negative prompts, so constraints are phrased as things to do.

General notes on FLUX (Black Forest Labs)
  • BFL's official guidance for FLUX.2: no negative prompts (describe what you want), write sentences rather than keyword lists, specify lighting, quote text to render, and pair colour names with hex codes.

Any image generator

Official docs read · checked 2026-10-11
General notes on Any image generator
  • Written as natural-language descriptions that the verified image models accept. Syntax for aspect ratio, quality and negative prompts differs by tool, so set those in your tool's own controls.

Source, license and attribution

Origin
Original by MarketerTools
Publisher
MarketerTools
License
Original work by MarketerTools, free to copy and use. Informed by the linked documentation; no third-party text is reproduced.
Platform assumptions checked
2026-10-11

Documentation and references behind this prompt

These informed the structure and the platform notes. A reference is not a license, and no third-party prompt text is copied here.

Spotted an attribution error, or are you a source owner with a request? Use the chat button at the bottom right and quote prompt ID img-031. We will correct or remove it.

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