About

Mewgenics Save Viewer is a fan-made web app at mewgenics.tools for players who want help with breeding decisions, room planning, and roster analysis. It is not affiliated with Glaiel Games or Edmund McMillen.

What it does

Upload a Mewgenics .sav file to browse cats, score breeding pairs, explore family trees, plan multi-generation lines, and inspect house data. Parsing runs in your browser with WebAssembly; your save is not uploaded for analysis.

• Cat roster — filters, sorting, inbreeding coefficients (COI)
• Breeding optimizer — pair scoring, defect risk, room stimulation from save
• Breeding planner — multi-generation goal chains
• Team builder, family tree, achievement tracker
• Room calculator — works without a save file

Step-by-step help lives in the guides. Community tools and references are listed under Other Tools in the app.

Game version

Breeding and defect mechanics are aligned with v1.1.21039+ and community wiki datamining as of May 2026.

Privacy

Save files stay on your device. See the privacy page for local storage, analytics, and third-party services.

Feedback

Bug reports, guide suggestions, and feature ideas are welcome.