Imported from halt-catch-fire/mutiny (guides/design/logo-design-guide/SKILL.md). Install upstream with npx skills add halt-catch-fire/mutiny --skill logo-design-guide. Copyright stays with the author.

Install the belt CLI skill: npx skills add belt-sh/cli

Logo Design Guide

Design effective logos with AI image generation via inference.sh CLI.

Quick Start

Requires inference.sh CLI (belt). Install instructions

belt login

# Generate a logo concept
belt app run falai/flux-dev-lora --input '{
  "prompt": "flat vector logo of a mountain peak with a sunrise, minimal geometric style, single color, clean lines, white background",
  "width": 1024,
  "height": 1024
}'

Logo Types

Type	Description	When to Use	Example
Wordmark	Company name styled as logo	Strong brand name, short (< 10 chars)	Google, Coca-Cola
Lettermark	Initials only	Long company name, formal	IBM, HBO, CNN
Pictorial	Recognizable icon/symbol	Universal brand, works without text	Apple, Twitter bird
Abstract	Geometric/non-literal shape	Tech companies, conceptual brands	Nike swoosh, Pepsi
Mascot	Character illustration	Friendly brands, food/sports	KFC Colonel, Pringles
Combination	Icon + wordmark together	New brands needing both recognition and name	Burger King, Adidas

Critical AI Limitation

AI image generators cannot reliably render text. Letters will be distorted, misspelled, or garbled.

Strategy:

Generate the icon/symbol only with AI
Add text/wordmark in a design tool (Figma, Canva, Illustrator)
Or use a combination approach: AI icon + manually set typography

Prompting for Logos

Keywords That Work

flat vector logo, simple minimal icon, single color silhouette,
geometric logo mark, clean lines, negative space design,
line art logo, flat design icon, minimalist symbol

Keywords That Fail

❌ photorealistic logo (contradiction — logos aren't photos)
❌ 3D rendered logo (too complex, won't scale down)
❌ gradient logo (inconsistent results, hard to reproduce)
❌ logo with text "Company Name" (text rendering fails)

Prompt Structure

flat vector logo of [subject], [style], [color constraint], [background], [additional detail]

Examples by Logo Type

# Abstract geometric
belt app run falai/flux-dev-lora --input '{
  "prompt": "flat vector abstract logo, interlocking hexagonal shapes forming a letter S, minimal geometric style, single navy blue color, white background, clean sharp edges"
}'

# Pictorial nature
belt app run falai/flux-dev-lora --input '{
  "prompt": "flat vector logo of a fox head in profile, geometric faceted style, orange and white, minimal clean lines, white background, negative space design"
}'

# Mascot style
belt app run bytedance/seedream-4-5 --input '{
  "prompt": "friendly cartoon owl mascot logo, simple flat illustration, wearing graduation cap, purple and gold colors, white background, clean vector style"
}'

# Tech abstract
belt app run xai/grok-imagine-image-pro --input '{
  "prompt": "minimal abstract logo mark, interconnected nodes forming a brain shape, line art style, single teal color, white background, tech startup aesthetic"
}'

Scalability Rules

A logo must work at every size:

Context	Size	What Must Work
Favicon	16x16 px	Silhouette recognizable
App icon	1024x1024 px	Full detail visible
Social avatar	400x400 px	Clear at a glance
Business card	~1 inch	Clean print reproduction
Billboard	10+ feet	No pixelation, simple enough

Scalability Checklist

Recognizable as a 16px favicon (squint test)
Works in single color (black on white)
Works inverted (white on black)
No tiny details that disappear at small sizes
No thin lines that vanish when shrunk
Clear silhouette without color

Color Guidelines

Maximum 2-3 colors for the primary logo
Must work in single color (black, white, or brand primary)
Consider color psychology:
- Blue: trust, professional (finance, tech, healthcare)
- Red: energy, urgency (food, entertainment, retail)
- Green: growth, nature (health, sustainability, finance)
- Orange: friendly, creative (startups, youth brands)
- Purple: luxury, wisdom (beauty, education)
- Black: premium, elegant (fashion, luxury, tech)
Test on both light and dark backgrounds

Iteration Workflow

# Step 1: Generate 5-10 broad concepts
for i in {1..5}; do
  belt app run falai/flux-dev-lora --input '{
    "prompt": "flat vector logo of a lighthouse, minimal geometric, single color, white background"
  }' --no-wait
done

# Step 2: Refine the best concept with variations
belt app run falai/flux-dev-lora --input '{
  "prompt": "flat vector logo of a geometric lighthouse with light beam rays, minimal line art, navy blue, white background, negative space design"
}'

# Step 3: Generate at high resolution for final
belt app run bytedance/seedream-4-5 --input '{
  "prompt": "flat vector logo of a geometric lighthouse with radiating light beams, minimal clean design, navy blue single color, pure white background",
  "size": "2K"
}'

# Step 4: Upscale for production use
belt app run falai/topaz-image-upscaler --input '{
  "image": "path/to/best-logo.png",
  "scale": 4
}'

Common Mistakes

Mistake	Problem	Fix
Too much detail	Loses clarity at small sizes	Simplify to essential shapes
Relies on color	Fails in B&W contexts	Design in black first
Text in AI generation	Garbled/misspelled letters	Generate icon only, add text manually
Trendy effects (glows, shadows)	Dates quickly, reproduction issues	Stick to flat, timeless design
Too many colors	Hard to reproduce, expensive printing	Max 2-3 colors
Asymmetric without purpose	Looks unfinished	Use intentional asymmetry or stay balanced

File Format Delivery

Format	Use Case
SVG	Scalable vector, web, editing
PNG (transparent)	Digital use, presentations
PNG (white bg)	Documents, email signatures
ICO / Favicon	Website favicon (16, 32, 48px)
High-res PNG (4096px+)	Print, billboards

Note: AI generates raster images (PNG). For true vector SVG, use the AI output as a reference and trace in a vector tool, or use AI-to-SVG conversion tools.

Related Skills

npx skills add inference-sh/skills@ai-image-generation
npx skills add inference-sh/skills@prompt-engineering

Browse all apps: belt app list

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