Repository Analysis

Alex313031/thorium

Chromium fork named after radioactive element No. 90. Source code and Linux releases. Windows/MacOS/ARM builds served in different repos, links are towards the top of the README.md.

4.9 Likely human-written View on GitHub

Analysis Overview

This report presents the forensic synthetic code analysis of Alex313031/thorium, a C++ project with 7,407 GitHub stars. SynthScan v2.0 examined 37,340 lines of code across 226 source files, recording 124 pattern matches distributed across 9 syntactic categories. The overall adjusted score of 4.9 places this repository in the Likely human-written band.

The scanner applied 160+ deterministic lexical heuristics, multi-line block detectors, abstract syntax tree depth profilers, and a cross-file Jaccard similarity matrix to construct a statistically normalised synthetic code estimate. All matches are individually weighted by severity coefficient and contextual multiplier before summation, and the resulting headline score is temporally discounted to account for the repository's development history relative to the commercial emergence of large language model coding tooling (November 2022 onward).

4.9
Adjusted Score
4.9
Raw Score
100%
Time Factor
2026-08-03
Last Push
7.4K
Stars
C++
Language
37.3K
Lines of Code
226
Files
124
Pattern Hits
2026-08-09
Scan Date
0.04
HC Hit Rate

What These Metrics Mean

Adjusted Score
Primary synthetic code indicator. Raw score normalised per 1,000 lines of code and multiplied by the temporal discount factor. This is the definitive comparative metric — use it to rank repositories by AI authorship density.
Raw Score
The unmodified sum of all severity-weighted, context-multiplied pattern match scores before temporal discounting. Reflects the absolute signal strength independent of when the repository was last active.
Time Factor
The temporal discount multiplier (0–100%) applied to the raw score. Repositories last updated before ChatGPT's launch (Nov 2022) receive a 5% factor. Full signal is only assigned to repositories active in the post-adoption era (Jan 2024+).
Pattern Hits
Total count of individual pattern matches across all files and categories. A high hit count with a low score may indicate a very large codebase with isolated AI snippets; a low count with a high score indicates dense, concentrated AI signatures.
HC Hit Rate
High+Critical pattern hits per file, averaged across the repository. This orthogonal signal catches repositories where a few files are densely packed with high-severity AI tells — a strong indicator even when the normalised score appears moderate due to codebase size.
Lines of Code / Files
Total lines and files analysed. The scanner examines 94 file extensions. These denominators are used to normalise the score, enabling fair comparison between repositories of vastly different sizes.

Score History

Longitudinal tracking requires multiple scan runs. Once this repository is re-scanned after new commits land, this chart will visualise how the synthetic code signal evolves over time — enabling you to detect whether AI authorship is growing, stabilising, or being actively corrected by human engineers.

No multi-scan history yet — run the scanner again to build trend data.

Severity Breakdown

Classifies detected patterns by their diagnostic confidence and structural impact. CRITICAL patterns (coefficient 10) represent definitive synthetic signatures — hallucinated imports, explicit LLM attribution metadata — virtually never produced by human authors. HIGH (5) indicates strong structural tells such as cross-file repetition or cross-linguistic idioms. MEDIUM (2) covers recognisable conversational padding and AI-specific vocabulary. LOW (1) captures subtle indicators like tautological comments and generic boilerplate that require density to carry independent signal.

CRITICAL 0HIGH 10MEDIUM 5LOW 109

Directory Score Breakdown

This horizontal bar chart decomposes the repository's raw synthetic code score by top-level directory, allowing you to pinpoint precisely which modules or components carry the highest AI authorship density. Directories with disproportionately high scores relative to their size warrant targeted manual review: concentrated AI signatures often trace back to mass-generated configuration layers, auto-ported test suites, LLM-scaffolded boilerplate classes, or entire subsystems authored under heavy copilot assistance. Use this view to prioritise your human code-review effort.

Pattern Findings

The scanner identified 124 distinct pattern matches across 9 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a statistically significant AI authorship indicator. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.

Reading the findings table: The Severity column indicates the diagnostic confidence level (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — comment-context matches receive a ×1.5 weight because LLMs systematically over-annotate. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier as dense clusters constitute far stronger evidence of synthetic authorship than isolated hits.

Over-Commented Block81 hits · 81 pts
SeverityFileLineSnippetContext
LOWsetup.sh421#printf "\n" &&COMMENT
LOWtrunk.sh81COMMENT
LOWtrunk.sh101#printf "${c4} .,lllllllllllllllllllll,. \n" &&COMMENT
LOWinfra/portable/THORIUM-PORTABLE.sh1#!/bin/bashCOMMENT
LOWinfra/portable/C/THORIUM-PORTABLE.sh.x.c561#include <sys/ptrace.h>COMMENT
LOWinfra/portable/C/THORIUM-PORTABLE.sh.x.c841#endif /* HARDENING */COMMENT
LOWinfra/portable/C/THORIUM-SHELL.sh.x.c101 "\366\246\077\004\112\360\214\313\124\246\230\306\051\122\023\056"COMMENT
LOWinfra/portable/C/THORIUM-SHELL.sh.x.c281/* Seccomp Sandboxing Init */COMMENT
LOWinfra/portable/C/THORIUM-SHELL.sh.x.c561#include <sys/types.h>COMMENT
LOWother/build_ffmpeg.py261 elif target_arch == 'mipsel': # Unsupported beginning in M90COMMENT
LOW…_party/widevine/cdm/linux/arm64/widevine_cdm_version.h1// Copyright (c) 2012 The Chromium Authors. All rights reserved.COMMENT
LOWarm/third_party/libaom/cmake_update.sh1#!/bin/bashCOMMENT
LOWarm/third_party/xnnpack/generate_build_gn.py1# Copyright 2026 The Chromium Authors and Alex313031COMMENT
LOWarm/third_party/xnnpack/generate_build_gn.py21COMMENT
LOWarm/third_party/xnnpack/generate_build_gn.py41import platform as pyplatformCOMMENT
LOWpak_src/main.h1// Small alternative startfile for main()COMMENT
LOWpak_src/pak_pack.h1#pragma onceCOMMENT
LOWpak_src/pak_defs.h1#pragma onceCOMMENT
LOWsrc/tools/clang/scripts/build.py1121 # C++-y "Hello World" program only resulted in 14% faster builds.)COMMENT
LOWsrc/net/base/load_flags_list.h1// Copyright 2026 The Chromium Authors and Alex313031COMMENT
LOWsrc/net/base/load_flags_list.h21// All other caches are used as normal.COMMENT
LOWsrc/net/base/load_flags_list.h41COMMENT
LOWsrc/net/base/load_flags_list.h61// subresource and speculatively pre-connect or pre-resolve when a referringCOMMENT
LOWsrc/net/base/load_flags_list.h81COMMENT
LOWsrc/net/base/load_flags_list.h101// This flag must be set on requests that are allowed to reuse cache entriesCOMMENT
LOWsrc/google_apis/default_api_keys.h1// Copyright 2024 The Chromium AuthorsCOMMENT
LOW…le_system_access/file_system_access_safe_move_helper.h1// Copyright 2026 The Chromium Authors and Alex313031COMMENT
LOW…ent/browser/renderer_host/pepper/pepper_file_io_host.h1// Copyright 2026 The Chromium Authors and Alex313031COMMENT
LOWsrc/components/history/core/browser/history_backend.h1// Copyright 2026 The Chromium Authors and Alex313031COMMENT
LOWsrc/components/history/core/browser/history_backend.h21#include "base/containers/lru_cache.h"COMMENT
LOWsrc/components/history/core/browser/history_backend.h141 virtual void NotifyProfileError(sql::InitStatus init_status,COMMENT
LOWsrc/components/history/core/browser/history_backend.h201COMMENT
LOWsrc/components/history/core/browser/history_backend.h241 // the refs owned by the delegate and any pending transaction, so it willCOMMENT
LOWsrc/components/history/core/browser/history_backend.h341COMMENT
LOWsrc/components/history/core/browser/history_backend.h361 // {1-day, 7-day, 28-day} metrics whose spanning periods all end on thatCOMMENT
LOWsrc/components/history/core/browser/history_backend.h581COMMENT
LOWsrc/components/history/core/browser/history_backend.h701 bool UpdateVisitReferrerOpenerIDs(VisitID visit_id,COMMENT
LOWsrc/components/history/core/browser/history_backend.h781COMMENT
LOWsrc/components/history/core/browser/history_backend.h861 // If the caller wants to add this visit to the VisitedLinkDatabase, it needsCOMMENT
LOWsrc/components/history/core/browser/history_backend.h921COMMENT
LOWsrc/components/history/core/browser/history_backend.h941 // disk and opens a new transaction. This will be called automatically byCOMMENT
LOWsrc/components/history/core/browser/history_backend.h981 // type(s). If necessary, this method will create a new segment and return itsCOMMENT
LOWsrc/components/history/core/browser/history_backend.h1061 // of foreign visits, the deletion is implemented in multiple small batches toCOMMENT
LOWsrc/components/history/core/browser/history_backend.h1081COMMENT
LOWsrc/third_party/widevine/cdm/widevine_cdm_version.h1// Copyright 2026 The Chromium Authors and Alex313031COMMENT
LOW…s_data/resources/definitions/prepopulated_engines.json1// Copyright 2026 The Chromium Authors, Alex313031, and tomByrerCOMMENT
LOWsrc/chrome/browser/ui/browser.h1// Copyright 2026 The Chromium Authors and Alex313031COMMENT
LOWsrc/chrome/browser/ui/browser.h21#include "base/scoped_observation_traits.h"COMMENT
LOWsrc/chrome/browser/ui/browser.h41#include "components/prefs/pref_change_registrar.h"COMMENT
LOWsrc/chrome/browser/ui/browser.h261COMMENT
LOWsrc/chrome/browser/ui/browser.h301 std::optional<int64_t> display_id;COMMENT
LOWsrc/chrome/browser/ui/browser.h321#endifCOMMENT
LOWsrc/chrome/browser/ui/browser.h381 // Crashes if the requested browser creation is not allowed.COMMENT
LOWsrc/chrome/browser/ui/browser.h461 LocationBarModel* location_bar_model() { return location_bar_model_.get(); }COMMENT
LOWsrc/chrome/browser/ui/browser.h561COMMENT
LOWsrc/chrome/browser/ui/browser.h581 //COMMENT
LOWsrc/chrome/browser/ui/browser.h601 //COMMENT
LOWsrc/chrome/browser/ui/browser.h621 // have a chance to save their work before the window is closed withoutCOMMENT
LOWsrc/chrome/browser/ui/browser.h641 // 2. The Browser window is hidden, and a task is posted that results inCOMMENT
LOWsrc/chrome/browser/ui/browser.h681COMMENT
21 more matches not shown…
Cross-Language Confusion10 hits · 62 pts
SeverityFileLineSnippetContext
HIGHwin_scripts/tot.py54 "cd v8 && git restore . && git clean -ffd",CODE
HIGHwin_scripts/tot.py55 "cd third_party/devtools-frontend/src && git restore . && git clean -ffd",CODE
HIGHwin_scripts/tot.py56 "cd third_party/ffmpeg && git restore . && git clean -ffd",CODE
HIGHwin_scripts/trunk.py65 "cd v8 && git restore . && git clean -ffd",CODE
HIGHwin_scripts/trunk.py66 "cd third_party/devtools-frontend/src && git restore . && git clean -ffd",CODE
HIGHwin_scripts/trunk.py67 "cd third_party/ffmpeg && git restore . && git clean -ffd",CODE
HIGHother/build_ffmpeg.py969 '--extra-ldflags=-Wl,-flat_namespace -Wl,-undefined,warning',STRING
HIGHarm/third_party/xnnpack/generate_build_gn.py81 if (is_android && current_cpu == "arm64") {CODE
HIGHarm/third_party/xnnpack/generate_build_gn.py160 if (!(is_android && use_order_profiling)) {CODE
HIGHarm/third_party/xnnpack/generate_build_gn.py215 if (!(is_android && use_order_profiling)) {CODE
Self-Referential Comments5 hits · 13 pts
SeverityFileLineSnippetContext
MEDIUMwin_scripts/build_win.py3# This file is the equivalent of build_win.sh in the parent directory.COMMENT
MEDIUMinfra/portable/make_portable_win.py3# This file is the equivalent of make_portable_win.py.COMMENT
MEDIUMarm/third_party/xnnpack/generate_build_gn.py524 # Create a dependency list containing the source_set's for use by the mainSTRING
MEDIUMsrc/chrome/installer/linux/debian/build.sh14# Create the Debian changelog file needed by dpkg-gencontrol. This just adds aCOMMENT
MEDIUMsrc/chrome/installer/linux/debian/build.sh31# Create the Debian control file needed by dpkg-deb.COMMENT
Deep Nesting8 hits · 8 pts
SeverityFileLineSnippetContext
LOWinfra/portable/make_portable_win.py80CODE
LOWother/build_ffmpeg.py126CODE
LOWother/build_ffmpeg.py242CODE
LOWother/build_ffmpeg.py664CODE
LOWdepot_tools/win_toolchain/package_from_installed.py122CODE
LOWdepot_tools/win_toolchain/package_from_installed.py502CODE
LOWsrc/tools/clang/scripts/build.py652CODE
LOWsrc/tools/pgo/generate_profile.py47CODE
Unused Imports8 hits · 8 pts
SeverityFileLineSnippetContext
LOWother/build_ffmpeg.py7CODE
LOWother/build_ffmpeg.py11CODE
LOWother/build_ffmpeg.py17CODE
LOWother/build_ffmpeg.py19CODE
LOWdepot_tools/win_toolchain/package_from_installed.py38CODE
LOWarm/third_party/xnnpack/generate_build_gn.py46CODE
LOWsrc/tools/clang/scripts/build.py27CODE
LOWsrc/tools/clang/scripts/build.py35CODE
Hyper-Verbose Identifiers6 hits · 4 pts
SeverityFileLineSnippetContext
LOWarm/third_party/xnnpack/generate_build_gn.py313def _objectbuild_from_bazel_log(action, platform: _Platform) -> ObjectBuild:STRING
LOWarm/third_party/xnnpack/generate_build_gn.py432def _generate_supporting_source_set(ss: SourceSet) -> str:STRING
LOWarm/third_party/xnnpack/generate_build_gn.py446def _generate_per_platform_dep_lists(STRING
LOWarm/third_party/xnnpack/generate_build_gn.py483def _generate_main_source_set(STRING
LOWarm/third_party/xnnpack/generate_build_gn.py498def _generate_build_identifier() -> None:STRING
LOWsrc/components/neterror/resources/dino_game/offline.js1728function createAdjustedCollisionBox(box, adjustment) {CODE
Excessive Try-Catch Wrapping3 hits · 3 pts
SeverityFileLineSnippetContext
LOWwin_scripts/clean.py35 except Exception as e:CODE
LOWwin_scripts/clean.py46 except Exception as e:CODE
LOWinfra/Flatpak/com.alex313031.thorium/unlink_profiles.py41 except Exception:CODE
Slop Phrases2 hits · 2 pts
SeverityFileLineSnippetContext
LOWother/build_ffmpeg.py1022 # We want to make sure to play everything Android generates and plays.STRING
LOWsrc/chrome/common/chrome_constants.h29// NOTE: if you change the value of kFrameworkName, please don't forget toCOMMENT
Example Usage Blocks1 hit · 2 pts
SeverityFileLineSnippetContext
LOWarm/third_party/libaom/cmake_update.sh12# Usage:COMMENT