PostBox

Dark SaaSVisit sitepostbox.sh

A small app icon, centered two-line promise, and bright download action sit on a deep navy page above a device preview.

PostBox — captured interface — Viewport capture · opening screen

Source capture · 2026-09-08Open full image ↗

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Why this pattern works

A small app icon, centered two-line promise, and bright download action sit on a deep navy page above a device preview.

Design notes

Mood: Calm and approachable
Colors: Navy, bright blue, white, and pale lavender
Type: Large rounded sans-serif text is broken into short centered lines.
Layout: A small app icon, centered two-line promise, and bright download action sit on a deep navy page above a device preview.
Motion: This is a still viewport capture. Visit the original source to inspect motion and later sections.
Texture: Soft blue glow, a hand-drawn underline, and a dimensional app icon
Don't: Use original branding, copy, imagery, and product evidence when adapting this composition.

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What should the tool respect?

Preview & edit prompt

Prompt text

# My project
[Describe the product, audience, and screen you want to improve]

Stack: Use the existing project stack
Task: Implement the interface and verify the result in the existing project.

## Tool guidance (Any AI tool)
Use available project tools to inspect, implement, and test. State any unavailable capabilities.

# Design reference: PostBox
Source: https://postbox.sh/
Swipefile reference: https://swipefile.design/ref/hunt-postbox/
Captured: 2026-09-08. This is a dated reference, not a claim about the current live product.
Capture scope: one viewport. Do not infer unseen page sections or a complete user flow.

## Objective
Adapt the visual principles below to my project. Use my own content and identity. Do not reproduce logos, proprietary copy, or brand assets.

## Reference notes
- mood: Calm and approachable
- colors: Navy, bright blue, white, and pale lavender
- typography: Large rounded sans-serif text is broken into short centered lines.
- layout: A small app icon, centered two-line promise, and bright download action sit on a deep navy page above a device preview.
- motion: This is a still viewport capture. Visit the original source to inspect motion and later sections.
- texture: Soft blue glow, a hand-drawn underline, and a dimensional app icon
- dont: Use original branding, copy, imagery, and product evidence when adapting this composition.

Useful for: A small app icon, centered two-line promise, and bright download action sit on a deep navy page above a device preview.

## Acceptance criteria
- Existing project conventions, design tokens, working functionality, and unrelated changes are preserved.
- Two or three reference principles clearly support the user's task; conflicts are resolved in favor of usability and the existing product.
- Reusable components and semantic HTML express the interface. Available licensed assets are used; important UI text is never rendered as a bitmap.
- Every visible control has a defined behavior. Loading, empty, error, success, disabled, and long-content states are specified where relevant. Demo data is clearly labeled.
- Navigation and content adapt at 375px, 768px, and 1440px without horizontal page overflow. Keyboard use, visible focus, labeled inputs, at least 44px touch targets, readable contrast, and reduced motion are supported.
- Verification distinguishes rendered behavior from proposals and identifies anything still requiring a backend or external service.

## Quality bar
Clear hierarchy, consistent spacing, restrained surfaces, and purposeful motion. Avoid decorative gradients, excessive cards, placeholder buttons, and invented metrics unless the project calls for them. Do not claim a feature is connected or tested without evidence.

Assembled in your browser. No API key or AI request needed. Changing the fields refreshes the preview.

## Objective
Adapt the visual principles below to my project. Use my own content and identity. Do not reproduce logos, proprietary copy, or brand assets.

Useful for: A small app icon, centered two-line promise, and bright download action sit on a deep navy page above a device preview.

PostBox

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