Pencil vs Sider Code: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Pencil and Sider Code — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.
Pencil
Pencil (Pencil Works)
In-IDE design canvas that lets engineers design UI and convert designs directly into code to speed development.
Key features
- In-IDE Design Canvas: Provides a visual design canvas embedded inside developers' IDEs so users can create and edit UI designs without context switching to external design apps.
- Design-to-Code Export: Converts designs into code-friendly artifacts or components (land in code) to reduce manual implementation and speed delivery of production UI.
- Local MCP Server & Discovery: Runs a local MCP-style service that writes config (e.g., ~/.claude.json) so external tools and agents can discover Pencil, read its port/command, and integrate programmatically.
- Auto-Configuration & Port Sync: Supports auto-setup and auto-sync behaviors (project or global scope) so integrations (like OpenCode) automatically add Pencil to their configs and update ports when Pencil restarts.
- Project-Scoped Integration: Can be configured per-project or globally, allowing teams to make Pencil available only within specific repositories or across all projects for consistent workflows.
- Tooling & CLI Support: Exposes status, setup, and sync actions for partner tools and agent plugins (e.g., pencil_status, pencil_setup, pencil_sync) to manage connectivity and lifecycle programmatically.
- Canvas-based UI design embedded into developer workflows/IDEs
- Design-to-code export so visual designs can be converted into code artifacts
- Runs a local MCP/config server and writes runtime config to a file (e.g., ~/.claude.json) for tooling integrations
- Integration plugins (example: OpenCode pencil-sync) that auto-setup Pencil in project/global configs and auto-sync ports after restarts
- CLI/tools for status, setup and sync (pencil_status, pencil_setup, pencil_sync) to manage Pencil integration lifecycle
- Support for project or global scope configuration (config added to ~/.config/opencode/opencode.jsonc or ./opencode.json)
- Automatic port/config backup and validation when updating third-party tool configs
Best for
- IDE-native UI Implementation: Designers and engineers create UI layouts directly inside an IDE and export components to the codebase, eliminating design handoffs and manual translation.
- Agent-enabled Code Generation: Integrate with developer agents or automation (via Pencil's MCP config) to let bots generate, update, or wire up UI code from canvas designs automatically.
- Project-scoped Tooling Integration: Add Pencil to a single project's config to enable team members to access the same design-canvas tooling and keep design artifacts synchronized with that repository.
- Auto-recovery After Restarts: Use automatic port-sync and setup tools so external tooling (like OpenCode) recovers connectivity after Pencil restarts without manual reconfiguration.
- Rapid Prototyping and Iteration: Quickly prototype UI ideas inside the IDE, iterate in-context with code, and validate implementations faster by seeing designs translate to code artifacts immediately.
- Cross-tool Workflow Automation: Connect Pencil with CI, linters, or component libraries via its MCP endpoint to automate tasks like component registration, export, or style enforcement from designs.
- Embed visual design work directly inside developers' IDEs to reduce context switching
- Automatically export or convert canvas designs into code components or project assets
- Auto-configure developer tools and agents to use the locally running Pencil service
- Keep IDE/tooling configurations in sync when Pencil restarts or changes port
- Integrate Pencil with automation agents or local development frameworks to enable programmatic access to designs
Sider Code
Sider AI
Browser feature that rewrites any webpage from a plain-language instruction and remembers the customization for future visits.
Key features
- Plain-Language Page Editing: Describe the change you want in your own words and Sider Code applies it to the live page without scripts or DOM inspection.
- Persistent Per-Site Customizations: Saved changes reapply automatically the next time you visit that site instead of vanishing on reload.
- Structural Rewrites, Not Just Blocking: Beyond hiding elements, it can restructure content, add new actions, and transform how a page works.
- Page-Content Understanding: Combines comprehension with modification so it can summarize, extract, and explain page content in the same operation.
- Comment Thread Condensation: Turns hundreds of Reddit or Hacker News comments into an overview or a structured debate view.
- Reading Mode Generation: Converts scattered social threads and long chapters into clean articles with tables of contents and comfortable layouts.
- Distraction Removal: Strips elements like the YouTube Shorts shelf or applies dark mode to bright document editors.
- Bundled With Sider Suite: Ships alongside Sider Chat's frontier-model access, Claw browser automation, and Create image, video, and slide generation.
Best for
- Research Reading: Condensing long comment threads into the key viewpoints before deciding whether the discussion is worth reading in full.
- Long-Session Comfort: Applying dark mode or a calmer reading layout to writing tools used for hours at a time.
- Focus Enforcement: Permanently removing recommendation shelves and distraction surfaces from sites you use daily.
- Workflow Adaptation: Reorganizing an internal or third-party web tool so its layout matches how you actually work rather than the default.
- Content Extraction: Pulling structured information out of a page and reshaping it into a more usable view.
- Accessibility Adjustments: Reshaping cluttered pages into cleaner, easier-to-navigate layouts without waiting on the site owner.