With this UserScript and Violentmonkey of http://violentmonkey.github.io/ you can quickly see at a glance how organic the growth of a github repo likely is.

UserScript.js

// ==UserScript==
// @name         GitHub Fork/Star Ratio
// @author       OpenCoCa
// @namespace    https://github.com/
// @version      1.0.0
// @description  Shows fork/star ratio inline near the About section. Low ratios signal potential fake stars (CMU StarScout, ICSE 2026).
// @match        https://github.com/*/*
// @exclude      https://github.com/*/*/** 
// @grant        none
// @run-at       document-idle
// ==/UserScript==

(function () {
  "use strict";

  // Thresholds from the CMU paper + AwesomeAgents investigation
  // organic baseline ~0.08–0.23 (Flask, LangChain, AutoGPT)
  const WARN = 0.05;   // "warrants scrutiny"
  const CRIT = 0.02;   // Shardeum / FreeDomain territory

  function inject() {
    // Guard: only repo root pages
    const parts = location.pathname.split("/").filter(Boolean);
    if (parts.length !== 2) return;
    if (document.getElementById("gfsr-badge")) return;

    const starEl = document.getElementById("repo-stars-counter-star");
    const forkEl = document.getElementById("repo-network-counter");
    if (!starEl || !forkEl) return;

    const stars = parseInt(starEl.title.replace(/,/g, ""), 10);
    const forks = parseInt(forkEl.title.replace(/,/g, ""), 10);
    if (isNaN(stars) || isNaN(forks) || stars < 1) return;

    const ratio = forks / stars;
    const pct   = (ratio * 100).toFixed(1);

    // Pick colour + label
    let color, label, tip;
    if (stars < 300) {
      color = "#768390"; label = `${pct}%`;
      tip   = `Fork/star ratio ${pct}% · not enough stars to tell the story`;
    } else if (ratio <= CRIT) {
      color = "#f85149"; label = `⚠ ${pct}%`;
      tip   = `Fork/star ratio ${pct}% — this looks like a fake star signal. Real repos have 8–23%.`;
    } else if (ratio <= WARN) {
      color = "#d29922"; label = `! ${pct}%`;
      tip   = `Fork/star ratio ${pct}% — below 5%. Worth a closer look. Organic repos average 8–23%. `;
    } else {
      color = "#3fb950"; label = `✓ ${pct}%`;
      tip   = `Fork/star ratio ${pct}% — looks organic. This is the baseline for real repos (8–23%).`;
    }

    // Build badge
    const badge = document.createElement("span");
    badge.id = "gfsr-badge";
    badge.title = tip;
    badge.setAttribute("aria-label", tip);
    badge.style.cssText = `
      display: inline-flex;
      align-items: center;
      gap: 4px;
      margin-left: 8px;
      padding: 1px 7px;
      border-radius: 2em;
      font-size: 11px;
      font-family: ui-monospace, 'SFMono-Regular', monospace;
      font-weight: 600;
      letter-spacing: 0.02em;
      color: ${color};
      background: ${color}18;
      border: 1px solid ${color}44;
      cursor: default;
      vertical-align: middle;
      white-space: nowrap;
    `;
    badge.textContent = `⑂/★ ${label}`;

    // Inject: look for the "About" heading in the sidebar
    const aboutHeading = Array.from(document.querySelectorAll("h2"))
      .find(el => el.textContent.trim() === "About");

    if (aboutHeading) {
      aboutHeading.appendChild(badge);
    } else {
      // Fallback: after the repo description element
      const desc = document.querySelector(".f4.my-3") ||
                   document.querySelector('[data-pjax="#repo-content-pjax-container"] p');
      if (desc) desc.insertAdjacentElement("afterend", badge);
    }
  }

  // Run now, then re-run on GitHub's SPA navigations
  inject();

  const _push = history.pushState.bind(history);
  history.pushState = function (...args) {
    _push(...args);
    setTimeout(inject, 800);
  };
  window.addEventListener("popstate", () => setTimeout(inject, 800));
})();