Design and diagrams decision
Komposo
A narrow self-hosted tool that maps prompts to a small template set and exports code is realistic for a capable developer, but reproducing Komposo's scale, template library, tuned prompts, team features and support is not practical.
Visit website↗$15/mo
$180/yr
Read off the official pricing page.
$100one-off80 h to build
$200/mo6 h/mo upkeep
On cash alone, building overtakes the subscription at 14 seats.
No open-source build does this yet
Nothing published replaces this one, so a replacement starts from an empty file. Here is what it would have to cover.
What a replacement has to do
- Prompt → AI maps prompt to a design template and component choices → render editable UI mockup in a canvas/editor → refine via prompts or UI controls → export HTML/CSS or framework code.
What it still won’t have
- Access to Komposo's claimed large user base and brand trust
- Priority support, onboarding and team/agency collaboration features
- The product's likely proprietary prompt-engineering, templates and tuned model prompts
- Commercial license, billing, and credit system for scaled usage
What remains hard
- Brand trust
Trusted by 100,000+ users
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 14 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a minimal Komposo-like web app using Next.js + React + Tailwind CSS, a Postgres DB, and S3 for asset storage. Integrate an LLM (configurable provider API key) to accept a plain-text prompt and map it to one of ~12 HTML/CSS screen templates. Implement: (1) prompt submission + LLM call and response parsing, (2) template renderer to produce a static mockup (HTML/CSS) from the LLM output, (3) a browser-based editor to change text, swap images, pick color/theme variants and save versions, (4) an export endpoint that bundles downloadable Next.js/React code for the current mockup, (5) simple email/password auth and project persistence in Postgres. Out of scope: multi-seat billing, advanced model fine-tuning, a credit system, real-time collaborative editing, and a huge template marketplace. Include error handling for API failures, input validation, unit tests for core logic, and end-to-end tests for critical flows.
How we checked
How the score was reached
- Partly verdict base52
- 3 cited sources+3
- Price verified on pricing page+3
- 3/3 assessment runs agreed+4
- Evidence score62
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time - so the same evidence always produces the same number.
How scoring works →Cited sources · 3
Every page the run actually retrieved.
- official productKomposo - From Idea to UI in Minutes
- official pricingPricing Plans - Komposo
- official productAI Visual Creator for Product Managers | Jira Ticket Visuals
Integrity checks
What held up, and what did not.