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Replica Diff: Clone Parity Checker

Scores how closely your app clone matches the original's features and screen layout

Source Download skill
Repository
Jakeschincariol/replica-skill
Stars
7,057
Licence
MIT
Files
3 files

What it does

Once installed, the agent can measure how close a cloned app is to an original. It weights a feature checklist (must, should, could) into a parity score, lists missing features in build order, and compares screenshots by layout while ignoring colour, so a rebrand doesn't count against the clone. It then writes a parity report with a shippable verdict and the top next steps.

Great for

  • Developers rebuilding an existing app who want an honest completeness score
  • Founders checking whether a clone is ready to ship before launch
  • Designers who want to compare screen structure rather than exact pixels

Skip it if

  • Pixel-perfect copying, since the skill explicitly discourages chasing the original's exact look (it changes the design on purpose)
  • Comparing apps you have no legitimate access to, since screenshots must come from public pages or your own account
  • Judging visual quality or brand design, since colour is deliberately ignored and the tool measures structure only

Try asking

  • “How close is my clone to the original app?”
  • “Run a parity check and tell me what's missing”
  • “Diff the screens in replica/screens against replica/clone-screens”
  • “Is my clone ready to ship? Write the parity report”
Step-by-step guide: how to use Replica Diff: Clone Parity CheckerInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 3 original files, the MIT licence and an attribution note.

    replica-diff.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip replica-diff.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip replica-diff.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • Keep features.csv current, since the score is only as accurate as the rows you fill in
  • Take screenshots at the same viewport (1440x900 desktop, 390x844 mobile) and in the same app state for meaningful layout scores
  • Use --mode pixel only for your own regressions, not for comparing against the original

What's inside

  • imgdiff.py
  • parity.py
  • SKILL.md

Redistributed unmodified from Jakeschincariol/replica-skill under the MIT licence. The assessment was drafted with AI from the skill's files on 2026-11-02. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.