Meridian Budget Optimization
google/meridian
Reopens a fitted Meridian MMM from a saved file and runs budget allocation scenarios, producing an HTML report and a Python script that repeats the run.
Compares an app clone against the original: a feature parity score from the feature matrix (weighted by must, should, could) with the missing list in build order, plus a screenshot layout diff that…
Install Replica Diff
$ npx skills add Jakeschincariol/replica-skill --skill replica-diff -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Jakeschincariol/replica-skill replica-diff --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/Jakeschincariol/replica-skill.git skills-src && mkdir -p .claude/skills && cp -r skills-src/replica-diff .claude/skills/replica-diff && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "replica-diff" agent skill from https://github.com/Jakeschincariol/replica-skill/tree/main/replica-diff into .claude/skills/replica-diff/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replica-diff", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/Jakeschincariol/replica-skill/tree/main/replica-diffType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add Jakeschincariol/replica-skill --skill replica-diff -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Jakeschincariol/replica-skill replica-diff --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Jakeschincariol/replica-skill.git skills-src && mkdir -p .agents/skills && cp -r skills-src/replica-diff .agents/skills/replica-diff && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "replica-diff" agent skill from https://github.com/Jakeschincariol/replica-skill/tree/main/replica-diff into .agents/skills/replica-diff/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replica-diff", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Jakeschincariol/replica-skill --skill replica-diff -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Jakeschincariol/replica-skill replica-diff --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Jakeschincariol/replica-skill.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/replica-diff .cursor/skills/replica-diff && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "replica-diff" agent skill from https://github.com/Jakeschincariol/replica-skill/tree/main/replica-diff into .cursor/skills/replica-diff/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replica-diff", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/Jakeschincariol/replica-skill.git --path replica-diff--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add Jakeschincariol/replica-skill --skill replica-diff -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Jakeschincariol/replica-skill replica-diff --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Jakeschincariol/replica-skill.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/replica-diff .gemini/skills/replica-diff && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "replica-diff" agent skill from https://github.com/Jakeschincariol/replica-skill/tree/main/replica-diff into .gemini/skills/replica-diff/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replica-diff", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install Jakeschincariol/replica-skill replica-diffInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add Jakeschincariol/replica-skill --skill replica-diff -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Jakeschincariol/replica-skill.git skills-src && mkdir -p .github/skills && cp -r skills-src/replica-diff .github/skills/replica-diff && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "replica-diff" agent skill from https://github.com/Jakeschincariol/replica-skill/tree/main/replica-diff into .github/skills/replica-diff/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replica-diff", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Jakeschincariol/replica-skill --skill replica-diff -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Jakeschincariol/replica-skill replica-diff --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Jakeschincariol/replica-skill.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/replica-diff .opencode/skills/replica-diff && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "replica-diff" agent skill from https://github.com/Jakeschincariol/replica-skill/tree/main/replica-diff into .opencode/skills/replica-diff/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replica-diff", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
replica-diff- GitHub stars
- 734
- Token cost
- ~1k tokens
- SKILL.md length
- 487 words
- Files
- 3
- Skills in repo
- 11
- Repo updated
- First seen
- Licence
- MIT
At a glance
Compares an app clone against the original: a feature parity score from the feature matrix (weighted by must, should, could) with the missing list in build order, plus a screenshot layout diff that…
- Works in 4 steps: feature parity → layout diff → behaviour diff → …
- The user says how close is my clone
- SKILL.md covers What parity means here, Step 1: feature parity, Step 2: layout diff and Step 3: behaviour diff, plus 2 more sections
- Runs Python scripts from its folder; calls python3
What it does
Replica Diff is an agent skill from Jakeschincariol/replica-skill. Compares an app clone against the original: a feature parity score from the feature matrix (weighted by must, should, could) with the missing list in build order, plus a screenshot layout diff that ignores colour so a rebrand does not count against you. Two standard-library Python tools. Use when the user says "how close is my clone", "compare it to the original", "what's missing", "parity check", "diff the screens", "is it ready", or after /replica-test.
Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `imgdiff.py` and `parity.py`).
It sits in Marketing & SEO, covering Brand strategy and identity. It works with Python. The repository describes itself as: Eleven free Claude skills that clone any app: reverse-engineer it, rebuild it, test it for bugs, then fix what its users hate. Free, MIT. The licence is MIT.
When your agent uses it
- The user says how close is my clone
- Compare it to the original
- Diff the screens
- After /replica-test
Example prompts
- “how close is my clone”
- “compare it to the original”
- “s missing”
- “/replica-diff”
Requirements
- Python 3
Workflow steps
4 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 77c9436. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships script files (Python), which the agent can run.
Shell commands in SKILL.md call:
python3
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Replica Diff loads about 1k tokens when it runs. Until then it costs about 118 tokens; SKILL.md has 487 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from Jakeschincariol/replica-skill at commit 77c9436, republished under its MIT licence (© Jakeschincariol). 487 words, ~1,025 tokens.
Download SKILL.mdSave it as
.claude/skills/replica-diff/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- replica-diff
- description
- Compares an app clone against the original: a feature parity score from the feature matrix (weighted by must, should, could) with the missing list in build order, plus a screenshot layout diff that ignores colour so a rebrand does not count against you. Two standard-library Python tools. Use when the user says "how close is my clone", "compare it to the original", "what's missing", "parity check", "diff the screens", "is it ready", or after /replica-test.
replica-diff
Two tools in this folder, both standard-library Python, no installs:
python3 parity.py replica/features.csv # feature parity + missing list
python3 imgdiff.py replica/screens/S07.png replica/clone-screens/S07.png --out diff-S07.png
python3 imgdiff.py a.png b.png --json > replica/diffs/S07.json # for parity.py --visual
python3 parity.py replica/features.csv --visual replica/diffs/*.json --markdown > replica/parity.mdWhat parity means here
Parity means it does the same job, not that it looks the same. The feature score is the number that matters: can a user do everything they could do in the original. The layout score checks structure (is the information in the same places, in the same hierarchy), because that is what makes a switcher feel at home. It deliberately ignores colour, because replica-brand changes every colour on purpose. Do not chase pixel parity with the original. Its exact look is its trade dress, and it changes before launch.
Step 1: feature parity
Make sure replica/features.csv is current: every row's clone column is
yes, partial (with a note), no, or skip (with a reason). Then:
python3 parity.py replica/features.csvIt weights must 3, should 2, could 1, counts partial as half, leaves out
skip rows and rows you added that the original does not have, and prints:
the score, must-haves done of total, each area weakest first, and the missing
list in build order. Must-haves not done means not shippable, and it says so.
Step 2: layout diff
For each key screen, take two screenshots at the same viewport (1440x900
desktop, 390x844 mobile) in the same state (same data shape, same tab
open, logged in the same way). The original's come from public pages or the
user's own account, saved in replica/screens/. The clone's go in
replica/clone-screens/.
python3 imgdiff.py replica/screens/S07.png replica/clone-screens/S07.png --out replica/diffs/S07.pngLayout mode (default) turns both into edge maps, cuts them into a grid, and compares where things are, scoring only cells with something in them. It reports the score (matches 90+, close 75+, partly 50+, different), the regions that differ (in the original's pixel coordinates, biggest first), and a height difference if the clone's page is much longer or shorter. Retina and non-retina screenshots compare fine: both are scaled to the same width.
--mode pixel is exact comparison. Use it for your own regressions (clone
today against clone last week), not against the original.
Show full SKILL.md (155 more words)Show less
Step 3: behaviour diff
Walk each flow in both apps and compare what the scores cannot see: clicks to finish the core flow, what happens on errors, what is remembered between visits, what emails arrive. Fewer clicks than the original is a win. Write each difference as: flow, original does, clone does, fix or keep.
Step 4: the report
replica/parity.md: overall score, feature score, layout score per screen,
missing features in build order, behaviour differences, and a verdict:
- not shippable: any must-have missing, or any open S1 bug
- shippable: all must-haves done, feature score 80+, no open S1 or S2
- better than the original: shippable, plus fixes from replica-entrepreneur. This is the goal. A straight copy has no reason to exist.
Give honest numbers. A clone at 62% is at 62%.
Output
replica/parity.md, the diff images, and the top five things to build next.
Then /replica-build for the gaps, or /replica-entrepreneur if parity is
there.
© Jakeschincariol, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 2 other files in replica-diff of Jakeschincariol/replica-skill.
- SKILL.md
- imgdiff.py
- parity.py
Open the folder on GitHubat commit 77c9436
Compare with similar skills
Replica Diff next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Replica Diff this skillJakeschincariol/replica-skill | 734 | — | ~1k | Automated safety check: Pass | MIT | |
| Meridian Budget Optimizationgoogle/meridian | 1.6k | — | ~1.1k | Automated safety check: Pass | Apache-2.0 | |
| Dev Localsuperdesigndev/treg | 4.5k | — | ~623 | Automated safety check: Pass | Custom licence | |
| Last 30 Days Trend Researchnexu-io/open-design | 100k | — | ~1.3k | Automated safety check: Pass | MIT | |
| Beyondseobeyondtahir/beyondseo | 155 | — | ~4.3k | Automated safety check: Pass | MIT | |
| Petshare Setupportons/codex-pet-share | 135 | — | ~1.9k | Automated safety check: Notes | MIT |
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Plans the stack, database schema and API for an app clone, from the recon map replica-recon wrote.
Replica Brand
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Names and rebrands an app clone so it is the user's own: name candidates with the trademark, domain, store and handle checks to run, a new palette checked for contrast, a logo brief, a voice guide…
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Ships an app clone live on the user's own domain: a preflight gate (tests green, parity must-haves done, rebrand sweep clean, listing linted, legal pages up), production database and env vars, the…
Replica Design
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Rebuilds an app's design system for a clone: colour roles, type scale, spacing, radius, shadows and every component with its states, as design tokens plus component specs, with original assets…
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Researches the app being cloned and reads what its real users say in public reviews (App Store, Google Play, G2, Capterra, Trustpilot, Reddit, Hacker News, its own feature-request board), then ranks…
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Related
Works with
Categories
Questions about Replica Diff
What does Replica Diff do?
Compares an app clone against the original: a feature parity score from the feature matrix (weighted by must, should, could) with the missing list in build order, plus a screenshot layout diff that…. Replica Diff is an agent skill from Jakeschincariol/replica-skill. Compares an app clone against the original: a feature parity score from the feature matrix (weighted by must, should, could) with the missing list in build order, plus a screenshot layout diff that ignores colour so a rebrand does not count against you.
When should I use Replica Diff?
Replica Diff fits situations like: the user says how close is my clone; compare it to the original; diff the screens; after /replica-test.
How do I install Replica Diff in Claude Code?
Run `npx skills add Jakeschincariol/replica-skill --skill replica-diff -a claude-code`. Or copy the skill folder (replica-diff in Jakeschincariol/replica-skill) into .claude/skills/replica-diff in your project. Claude Code loads it when a task matches its description.
How do I install Replica Diff in Codex?
Run `npx skills add Jakeschincariol/replica-skill --skill replica-diff -a codex`. Or copy the skill folder (replica-diff in Jakeschincariol/replica-skill) into .agents/skills/replica-diff in your project. Codex loads it when a task matches its description.
Can I use Replica Diff in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Jakeschincariol/replica-skill --skill replica-diff -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/replica-diff, .gemini/skills/replica-diff, .github/skills/replica-diff and .opencode/skills/replica-diff in your project.
What does Replica Diff need to run?
Going by SKILL.md and its folder, Replica Diff needs Python for the scripts in its folder and the command-line tools its instructions call (python3). Our summary lists: Python 3.
Does Replica Diff access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Replica Diff safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Replica Diff use?
Replica Diff is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Replica Diff use?
About 1k tokens (SKILL.md is roughly 4.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Replica Diff?
Skills that share tags, products or a category with Replica Diff: Meridian Budget Optimization (google/meridian, 1.6k stars), Dev Local (superdesigndev/treg, 4.5k stars), Last 30 Days Trend Research (nexu-io/open-design, 100k stars) and Beyondseo (beyondtahir/beyondseo, 155 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Replica Diff?
Jakeschincariol (a GitHub user) maintains it in Jakeschincariol/replica-skill, which has 734 GitHub stars. The repository holds 11 skills in this directory. The repository was last updated on October 3, 2026.
Source: Jakeschincariol/replica-skill on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.