Markdown To HTML Converter
Convert Markdown to clean HTML with a live preview.
What it adds
Build a Markdown-to-HTML converter with side-by-side input, preview, and copyable output.
What your builder is told to do
4
What your builder is told to do
4-
1
Inspect any allowed tags or sanitization rules in the source files.
-
2
Create a Markdown input with a live rendered preview and an HTML output pane.
-
3
Sanitize output, handle large input, and show an empty state.
-
4
Add copy-HTML and download controls.
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
Unit Converter
Unit Converter
Convert between units across length, weight, volume, and more.
What it does
Build a unit converter with category tabs, instant conversion, and a swap control.
How it works
- 1 Inspect any unit sets or precision rules in the source files.
- 2 Create a category selector plus from/to unit inputs with live conversion.
- 3 Handle precision, very large or small values, and invalid input states.
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/unit-converter
Time Zone Converter
Time Zone Converter
Convert a time across zones and find overlapping hours.
What it does
Build a time zone converter that shows a chosen time across zones and highlights working-hour overlap.
How it works
- 1 Inspect any default zones or working-hour rules in the source files.
- 2 Create inputs for a base time, base zone, and additional zones.
- 3 Display converted times and a highlighted overlap window with DST handling.
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/time-zone-converter
Currency Converter
Currency Converter
Convert between currencies using editable or live rates.
What it does
Build a currency converter with a rate source seam so it works with static or live exchange rates.
How it works
- 1 Inspect any rate tables or currency lists in the source files.
- 2 Create amount and currency inputs with live conversion from an editable rate.
- 3 Add a rate-source seam and document the live-rate API integration still needed.
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/currency-converter
How it works
-
1
Copy the link
Grab the Markdown blueprint URL for this tool type.
-
2
Give it to your builder
Paste it into Claude Code, Cursor, Codex, or whatever AI builder is already working in your app.
-
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.