Solo
one fast pass
One agent builds the whole site in a single grounded pass — the fastest way from a prompt to a structured page.
Features
Everything it does.
A build-and-refine studio: AI agents, your own engines, Figma-grade editing on the live page, and a design library grounding each pass. Every visual change is verified on screen.
AI agents that build
Pick how much horsepower each build gets.
Every mode edits source files and proves the result against the render — the difference is how many agents work the problem.
Studio
clarify → build → review → fix
Asks one clarifying question when the brief is vague, builds, runs a fresh-eyed self-review, then fixes what it flagged — with an enforcer that holds the quality bar.
Swarm experimental
/flow · /multiflow
A planner maps the site; one builder per page builds them in parallel on the live canvas; a reviewer judges and builders fix the flagged pages — optionally a different AI per page.
Plannermaps the site
Builder · Home
Builder · Pricing
Builder · Docs
in parallel
Reviewerjudges & sends fixes
Plus an autonomous /loop — build → self-critique against an ideal → revise, bounded by iteration / token / dollar / minute limits.
Bring your own engine
Run it on Claude, your own API keys,
or the subscriptions you already pay for.
BYOK — everything is stored locally in your user profile and sent only to the matching provider. Never to us, never proxied.
Claude · default
Fable 5Sonnet 5Opus 4.8Haiku 4.5
Via the Agent SDK — your Anthropic API key, or an existing Claude Code sign-in that Loupe drives.
By API key
OpenRouterOpenAIGeminixAI
Alternative build engines, a cross-vendor QA judge, and image-generation models — each with a Test button and a full tool-calling build loop.
By subscription CLI
CodexGrokCopilotMiMo
Drive your existing subscription CLIs as build engines — no extra API cost, with per-CLI model selection and a status probe.
The studio
Direct a real site, not a chatbot.
Grounded in a bundled ~1,300-reference design library and filled with verified imagery.
snap · clean flex CSS
Figma-grade editing, on the live site
Select, move, resize, rotate, snap, align and auto-layout elements — persisted as clean, responsive CSS. Then /assemble what you arranged or /bake tweaks into source.
/bake/assemble
any site
retokenized
yours ✓
Borrow the web, on your terms experimental
Open any site inside Loupe, point at a section or asset, and adapt its technique to your tokens — recolored, retyped, yours. A reference, never a clone. SSRF-guarded.
1-click Responsive ✓
One canvas, every device
All pages and device widths on a single canvas — media queries fire — with a one-click responsive pass and a verified auto-dark counterpart.
Tokens, themes, palette
An always-in-sync design-token panel and palette board, generated from the site's CSS. Edit one :root color and recolor the whole site per theme.
Header
Hero · section
↳ Button
Footer
Layers over your DOM
A recursive layers tree with align and multi-select, straight over your real DOM — not a copy. Lock, hide, reorder, search.
✓ stock · vision-verified
✓ AI-generated · gpt-image / Grok / OpenRouter
⟳ 3D HDRI · CC0 Poly Haven
✓ each one checked to have loaded
Smart imagery
Placeholders auto-fill with relevance-ranked, vision-checked stock, custom AI-generated images, or CC0 3D HDRIs — each verified to have loaded, with honest fallbacks.
Honest comparison
How Loupe compares to the alternatives.
No spin — where another tool fits your case better, it says so, right in the table.
| Loupe | Onlook | Dyad | v0 (Vercel) | |
|---|---|---|---|---|
| Type | Local desktop AI build+refine studio | Visual editor for React apps | Local AI app/code builder | Cloud code-gen builder |
| Open source | Yes (MIT) | Yes (+ paid cloud) | Yes (Apache-2.0) | No |
| Runs locally / private | Yes | Partly (cloud-leaning) | Yes | No (cloud) |
| Bring your own key / subscription | Yes (Claude/Codex/Grok/Copilot) | Limited | Yes | No |
| Figma-grade edit on the live render | Yes | Yes (needs React code) | Partial | No |
| Every AI edit verified vs real render | Yes | No | No | No |
| Needs an existing codebase | No | Yes (React/Next+Tailwind) | No | No |
| Platform | Windows | Mac / web | Windows / Mac | Web |
| When to pick the OTHER instead | — | You're on Mac/web editing an existing React app | You want a full-stack app builder | You want instant cloud hosting/deploy |
Reflects each project's typical setup at the time of writing; open-source tools evolve — check their repos for the latest.
Everything else
The full toolbox.
Build & orchestrate
- Solo
- Studio
- Swarm /flow
- /multiflow
- autonomous /loop
- /explore · /apply
Edit on the live page
- element picker
- move · resize · rotate
- snap & align
- auto-layout
- inline text edit
- Draw tool
- inspector
Closed loop
- before/after pixel-diff
- auto re-feed on no-change
- unified undo/redo
- verify banner
Design system
- design tokens
- themes
- palette board
- moodboard
- auto-dark
Imagery & assets
- vision-verified stock
- AI-generated
- CC0 3D HDRIs
- drag-drop assets
Grounded & export
- ~1,300-ref corpus
- technique library
- your own library
- PNG · JPEG · vector PDF
Backed by the full feature inventory ↗, surveyed from the code.
See it on your next site.
Windows 10 / 11 · bring your own keys · local & private · MIT.