Colour Palette Generator
Generate accessible colour palettes from a seed colour, mood, or brand input.
What it adds
Build a colour palette generator with swatches, contrast notes, copyable values, and usage guidance.
What your builder is told to do
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What your builder is told to do
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Inspect brand files, current colors, accessibility requirements, and desired mood.
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Create inputs for seed color, palette style, number of colors, and contrast target.
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Generate swatches with hex values, roles, contrast warnings, and copy controls.
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Add export to CSS variables or JSON if useful for the user's stack.
Edge cases it handles
5
Edge cases it handles
5- Keep the tool focused on one primary job. If the source asks for a suite, build the first usable tool and list the obvious follow-ups.
- Do not invent testimonials, guarantees, legal disclaimers, revenue numbers, scarcity, or unverifiable claims.
- If formulas, scoring weights, or recommendation rules are missing, create editable placeholders and call out the assumptions.
- If payment, email, analytics, CRM, or storage integrations are missing, build clear seams and document the variables or endpoints still needed.
- Match the existing app or page design system unless the user explicitly asks for a standalone visual direction.
Definition of done
5
Definition of done
5- The tool is buildable as a standalone page, lightweight SPA, embeddable widget, or cleanly integrated app screen.
- The primary input, primary output, and primary action are obvious without extra instructions.
- The implementation includes empty, loading, error, and completed states.
- Mobile, tablet, and desktop layouts are accounted for.
- The agent reports the source files used, assumptions made, and any formulas or rules that still need owner review.
Related tool files
Username Generator
Username Generator
Generate available-looking username ideas from keywords and style.
What it does
Build a username generator that produces varied handle ideas with style filters and length control.
How it works
- 1 Inspect any style rules, allowed characters, or brand keywords in the source files.
- 2 Create inputs for keywords, style, length, and separators.
- 3 Generate handle ideas grouped by style with length and character-rule validation.
Copy the prompt
No account needed
Build this as a complete, standalone tool. Read the blueprint first and follow it exactly — make it responsive, handle empty and error states, and keep it production-ready:
https://buildthistool.com/x/username-generator
Headline Generator
Headline Generator
Generate headline options from audience, offer, proof, and tone.
What it does
Build a headline generator that produces useful options while staying grounded in supplied source material.
How it works
- 1 Inspect source files for audience, offer, mechanism, proof points, objections, and forbidden claims.
- 2 Create inputs for page type, desired angle, tone, and number of options.
- 3 Generate grouped headline variants with notes on the strategy behind each group.
Copy the prompt
No account needed
Build this as a complete, standalone tool. Read the blueprint first and follow it exactly — make it responsive, handle empty and error states, and keep it production-ready:
https://buildthistool.com/x/headline-generator
Cold Email Generator
Cold Email Generator
Generate outreach email variants from offer, audience, and proof.
What it does
Build a cold email generator that produces grounded outreach variants with subject lines and clear next steps.
How it works
- 1 Inspect source files for audience, offer, proof points, objections, and forbidden claims.
- 2 Create inputs for recipient type, goal, tone, and length.
- 3 Generate subject-line and body variants with notes on the angle behind each.
Copy the prompt
No account needed
Build this as a complete, standalone tool. Read the blueprint first and follow it exactly — make it responsive, handle empty and error states, and keep it production-ready:
https://buildthistool.com/x/cold-email-generator
How it works
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1
Copy the link
Grab the Markdown blueprint URL for this tool type.
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2
Give it to your builder
Paste it into Claude Code, Cursor, Codex, or whatever AI builder is already working in your app.
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3
It maps, then builds
Your agent reads the blueprint first, then builds the tool into your app around the rules, audience, and stack.
Works with your stack
These blueprints are written to adapt. They tell the agent to detect your framework, match your existing design system, and use your source files instead of guessing the tool rules.
Need it tighter than that? Customize the tool file and tell it exactly which source docs and stack to use.