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SPECIFICTION
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Pencil Project

pencil.evolus.vn

Free plan WindowsmacOSLinux
Visit pencil.evolus.vn
Spec score 7.8 #16 of 29 in Wireframing Software

What it is

Pencil Project is a free, open-source desktop tool for creating GUI mockups, wireframes, and diagrams. Built-in stencil collections cover desktop, web, Android, and iOS interfaces; connectors and flowchart shapes support diagramming. Elements can link to pages in the same document, and those links become hyperlinks in web exports. Drawings can be exported as PNG files, web pages, OpenOffice or LibreOffice text documents, Inkscape SVG, or Adobe PDF. A clipart browser connected to OpenClipart.org lets users add vector clipart by dragging it into a project. Stencil collections and export templates can be installed as add-ons. Pencil runs on Linux, macOS, and Windows, with downloads for Fedora and Ubuntu, other GNU/Linux distributions, Windows, and macOS. The macOS DMG supports Intel and Apple Silicon. Pencil is published under GNU General Public License version 2; Evolus also describes a commercial source-code license. The site identifies version 3.1.1 as the latest stable release and warns that nightly development builds are unstable. It provides a SHA-1 checksum link for download verification and invites donations to support development.

Spec sheet

Purpose
Pencil is a free, open-source GUI prototyping tool for creating mockups.Read 8 Oct 2026 · pencil.evolus.vn
Free plan
YesRead 20 Sep 2026 · pencil.evolus.vn
Support
The site invites users to support continued development through donations.Read 8 Oct 2026 · pencil.evolus.vn
License
Pencil is published under GNU General Public License version 2; the page also describes a commercial source-code license available from Evolus.Read 8 Oct 2026 · pencil.evolus.vn
Add-ons
Stencil collections and export templates can be installed into Pencil as add-ons.Read 8 Oct 2026 · pencil.evolus.vn
Build stability
The site warns that nightly development builds are unstable and should be used at the user's own risk.Read 8 Oct 2026 · pencil.evolus.vn
Clipart integration
The clipart browser integrates with OpenClipart.org and supports adding vector clipart by drag and drop.Read 8 Oct 2026 · pencil.evolus.vn
Diagram types
GUI mockups,wireframes,flowcharts,desktop UI,web UI,Android UI,iOS UIRead 20 Sep 2026 · pencil.evolus.vn
Diagramming
Connectors and flowchart shapes can be used to draw diagrams.Read 8 Oct 2026 · pencil.evolus.vn
Download verification
The downloads page provides a SHA-1 checksum link for verifying downloads.Read 8 Oct 2026 · pencil.evolus.vn
Export formats
Drawings can be exported as PNG files, web pages, OpenOffice or LibreOffice text documents, Inkscape SVG, and Adobe PDF.Read 8 Oct 2026 · pencil.evolus.vn
Interactive mockups
Elements can link to pages in the same document, and those links become hyperlinks in web exports.Read 8 Oct 2026 · pencil.evolus.vn
Interface stencils
Built-in shape collections cover desktop, web, Android, and iOS interfaces.Read 8 Oct 2026 · pencil.evolus.vn
Latest stable release
The home page identifies version 3.1.1 as the latest stable release and says it contains stability fixes and new features.Read 8 Oct 2026 · pencil.evolus.vn
macOS support
The downloads page offers a universal macOS DMG for Intel and Apple Silicon.Read 8 Oct 2026 · pencil.evolus.vn
Supported systems
The downloads page lists builds for Fedora and Ubuntu Linux, other GNU/Linux distributions, Windows, and macOS.Read 8 Oct 2026 · pencil.evolus.vn

Plans and prices

Pencil Free Completely free; desktop app Read 8 Oct 2026 · pencil.evolus.vn

Every Pencil Project plan and price →

Strong points and limits

Strong points

  • Built-in stencils cover desktop, web, Android, and iOS.
  • Exports include PNG, SVG, PDF, and web pages.
  • Mockup elements can link to document pages.
  • Free and open source.

Limits

  • Nightly development builds are described as unstable.
  • It is a desktop app, not a web platform.
  • No free trial is listed.

Who it suits

Pencil suits people making interface mockups or diagrams who want a free desktop tool across Linux, macOS, or Windows. Its stencil sets and export options also suit those preparing linked mockups or varied output formats.

Verdict

Pencil combines interface stencils, diagram shapes, linked mockups, and several export formats in a free desktop application. The listed stable release is 3.1.1; nightly builds carry an instability warning.

Where Specifiction places it

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