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FashionFreedom/Seamly2D

Open source patternmaking software to democratize fashion.

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FashionFreedom/Seamly2D has 1k+ stars and 150+ forks on GitHub, is written in C++, and was last pushed on Oct 19, 2026. Data as of . Signed-in members get hourly updates — create a free account.

Summary Information

Updated 14 minutes ago
Type:ApplicationCategory(s):Design & Creative ToolsMedia, Graphics & Games
Added to GitGenius on September 3rd, 2023
Created on October 30th, 2017
Open Issues & Pull Requests: 214 (-2)
GitHub issues: Enabled
Number of forks: 178
Total Stargazers: 1,001 (+0)
Total Subscribers: 30 (+0)

Repository Insights (GitGenius)

Median issue/PR response: 2.0 hours
Mean response time: 143.8 days
90th percentile: 248.6 days
Tracked items: 308

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Maintainer activity

6 people did triage or write work on this repository in the last 12 months.

Counts unlabeled, assigned, unassigned, milestoned, demilestoned, locked, unlocked over the last 12 months. These are issue and pull request events that require triage or write permission. Commits and code review are not counted. labeled and renamed are excluded because GitHub issue forms record the issue author as the actor. Figures from October 18, 2026. This count is not comparable across projects: each project's automation decides which of these events a person emits. How this is counted.

How this project is maintained

About 7% of issues opened in the past year have never received a reply. 100% of open issues come from outside the core team, so the backlog reflects real-world use rather than internal planning. 78% of issues opened in the past year have been closed, leaving a working backlog. Three people close 90% of everything that gets resolved.

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Issue Activity (beta)

Open issues: 172
New in 7 days: 4
Closed in 7 days: 2
Avg open age: 1,588 days
Stale 30+ days: 162
Stale 90+ days: 158

Recent activity

Opened in 7 days: 4
Closed in 7 days: 2
Comments in 7 days: 2
Events in 7 days: 8

Top labels

  • enhancement (259)
  • bug (216)
  • Draft mode (132)
  • UI (101)
  • build (61)
  • Piece mode (49)
  • measurements (31)
  • workflow (30)

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Detailed Description

Seamly2D is open source patternmaking software that enables designers to create custom-fit garments by reading both standardized multi-size measurement files and individual measurement data. The tool runs on Windows, macOS, and Linux, with distribution through standard installers and package managers including Flatpak.

The software addresses the need for accessible pattern design by allowing users to generate patterns tailored to specific body measurements rather than relying on fixed sizing. Each pattern file can accommodate multiple measurement sources, making it suitable for both standardized production and bespoke custom garment creation. The application is built in C++ using Qt5 and provides a graphical interface for digital pattern drafting.

Seamly2D suits anyone designing custom clothing or exploring pattern-making workflows who values open source tools and cross-platform availability. The project maintains an active user forum and wiki documentation for learning. The tool is particularly relevant for makers, small-scale manufacturers, and fashion enthusiasts seeking to move beyond proprietary design software.

The project demonstrates substantial real-world adoption, with almost all open issues originating from external users rather than the core team. Maintainers respond to new issues and pull requests within hours. Work in the issue tracker centers on bug fixes, enhancements, and Draft mode functionality.