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pen.dev vs Sleek

Side-by-side comparison of features, pricing, ratings, and alternatives.

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pen.dev
pen.devNever start from scratch. Design with agents, refine every detail on canvas, and ship it back to code.
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Sleek
SleekDesign mobile apps in minutes
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Overview
Description

An agentic canvas for building bold ideas. It is a design tool that integrates AI agents directly on the canvas, allowing users to import any part of any app, work with multiple AI models (Claude, OpenAI, Grok, etc.), and design with agents. It includes familiar design features like Figma import, pen tool, shaders, gradients, components, variables, HTML export, and more, all powered by a custom WebGL pipeline for smooth performance.

Sleek is an AI-powered mobile app designer that lets users go from idea to polished iOS and Android app designs in minutes by chatting with AI. It generates complete screens with layout, components, copy, and styling, and offers visual editing, templates, and one-click export to Figma or code (HTML/React with Tailwind CSS). It also provides an API and agent skill for use with AI coding agents like Claude Code, Codex, or Cursor.

Pricing
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Freemium

Sleek offers a free plan with 60 one-time credits, plus paid subscription plans starting at $39/month for Starter, $69/month for Pro, and $99 per seat/month for Team, with annual billing options available.

Category
UI & UX Design
Low-Code / No-Code
Best for
Designers, UI/UX professionals, developers, and teams who want to leverage AI in their design workflow and seek an alternative to traditional design tools like Figma.
Founders, product managers, marketers, developers, and designers who need mobile app designs quickly without spending hours in Figma.
Specifications
Platform
Web-based (browser)
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File Format
Open .pen format (JSON)
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Key Features
Pen tool, Shaders, Gradients, Components, Slots, Variables, Flex layout, Effects, Snapping, Pixel grid, Layers panel, Presentation mode, Share by link, MCP/CLI support
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AI Integration
Supports Claude, OpenAI, Grok, Gemini, Qwen, Kimi, Deepseek, Minimax via subscriptions or API keys
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Export Formats
HTML/CSS/Tailwind, PNG, JPEG, WEBP, PDF
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Import Formats
Figma (.fig), HTML, Webpages (via built-in browser), SVG
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Pro plan
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$69/month or $360/year (20,000 credits/month)
Free plan
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$0 (60 one-time credits, 1 project, 3 screens)
Team plan
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$99 per seat/month or $490 per seat/year (30,000 credits per seat/month)
Starter plan
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$39/month or $240/year (3,000 credits/month)
Target users
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Founders, product managers, marketers, developers, and designers
Export formats
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Figma (native editable layers), HTML, React with Tailwind CSS
Design conventions
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iOS Human Interface Guidelines, Material Design, native navigation, accurate device dimensions, tap-target sizing
AI agent integration
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API and agent skill for Claude Code, Codex, Cursor, and other coding agents
Pros & Cons
Pros
  • Agentic canvas with AI integration for design
  • Supports multiple AI models (Claude, OpenAI, Grok, Gemini, etc.)
  • Import from Figma, HTML, or any webpage via built-in browser
  • Buttery smooth performance with custom WebGL pipeline
  • No design experience required; built for founders, PMs, marketers, and developers
  • Generates complete, high-fidelity mobile app screens from a simple text prompt or reference image
  • Mobile-specific design conventions (iOS HIG, Material Design, native navigation, accurate device dimensions)
  • Visually edit and iterate designs quickly without needing Figma skills
Cons
  • Relatively new and less established than Figma
  • May require subscription to AI models or API keys for full agent functionality
  • Limited community and plugin ecosystem compared to Figma
  • Dependence on web-based platform might be a concern for offline work
  • Free plan is very limited (60 one-time credits, 1 project, 3 screens)
  • Paid plans are subscription-based and may be costly for casual users ($39-$99/month or $240-$490/year)
  • AI-generated designs may still require manual refinement for complex or highly custom needs
  • Primarily focused on mobile app design, not suitable for web or desktop UI design
Community & Metrics
Upvotes
0
0
User rating
Not enough data
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Sleek
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pen.dev
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The Verdict

AI-generated from listing data

Sleek is the safer default for fast, mobile‑only AI design with clear pricing; pen.dev offers a richer, web‑focused canvas but its cost and maturity are uncertain.

Key differences

  • •Target platform: Sleek specializes in mobile app screens; pen.dev is a general web‑canvas tool.
  • •Pricing transparency: Sleek lists concrete subscription tiers; pen.dev’s pricing is not specified.
  • •Feature depth: pen.dev includes advanced canvas tools (shaders, flex layout, variables) and multi‑model AI; Sleek focuses on prompt‑driven screen generation.
  • •Export options: Sleek exports native Figma layers, HTML, React/Tailwind; pen.dev exports HTML/CSS/Tailwind plus image formats.
  • •Collaboration model: Sleek provides team seats and credit‑based plans; pen.dev relies on link‑sharing with a less‑established team feature set.
DimensionWinner

Pricing & value

Sleek lists free credits and tiered plans ($39‑$99/mo); pen.dev pricing is unknown.

Sleek

Ease of use / learning curve

Sleek generates screens from text prompts, requiring no design skill; pen.dev’s canvas and shortcuts need more learning.

Sleek

Features & depth

pen.dev offers a full canvas, shaders, flex layout, variables, and multi‑model AI; Sleek is limited to mobile screen generation.

pen.dev

Integrations & ecosystem

pen.dev supports many AI models, Figma import, CLI, and open .pen JSON format; Sleek integrates mainly with Figma and coding agents.

pen.dev

Collaboration

Sleek provides team seats with shared credits; pen.dev only offers link‑sharing and has a smaller community.

Sleek

Choose pen.dev if…

Designers or dev teams wanting a full‑featured web UI canvas and multi‑AI model support, tolerant of unknown pricing.

Choose Sleek if…

Founders, PMs, or marketers needing quick mobile app mockups with predictable costs.

Common questions

What is the cost to start using each tool?

Sleek offers a free plan (60 credits) and paid plans from $39/mo; pen.dev’s pricing is not disclosed.

Can I design desktop or web interfaces with Sleek?

No, Sleek is focused on mobile app design only; pen.dev supports web design and general UI.

Which tool exports directly to editable Figma layers?

Sleek provides one‑click export to native, editable Figma layers; pen.dev exports to HTML/CSS/Tailwind but not Figma.