By the numbers

A quantitative snapshot of the codebase. Data collected on 2026-04-30 from the master branch at commit 82a973c0.

Size

xychart-beta horizontal
    title "Lines of source code by language"
    x-axis ["Python", "JavaScript", "CSS"]
    y-axis "Lines" 0 --> 50000
    bar [43654, 5068, 1732]

Language	Files	Lines
Python	213	~43,654
JavaScript	30	~5,068
CSS	1 (style.css)	~1,732

Counts exclude the gitignored extensions/ directory and vendored model code under repositories/. The extensions-builtin/ tree is included.

The largest single Python files are concentrated in the generation pipeline and the UI:

Lines	File
1,792	modules/processing.py
1,235	modules/ui.py
1,040	modules/scripts.py
1,034	modules/sd_models.py
929	modules/api/api.py
877	modules/images.py
838	modules/ui_extra_networks.py
701	modules/ui_extensions.py
678	modules/deepbooru_model.py (model architecture, generated from upstream)
677	modules/sd_hijack_optimizations.py

JavaScript is dominated by javascript/extraNetworks.js (970 lines) and javascript/ui.js (436 lines).

There is one CSS file (style.css, 43 KB) — there is no preprocessor or component-scoped styling.

Activity

Total commits in the repository: 7,689 (across 7,916 commit SHAs counting tag refs).

xychart-beta horizontal
    title "Commits per month, last 12 months of activity"
    x-axis ["2023-08", "2023-09", "2023-10", "2023-11", "2023-12", "2024-01", "2024-02", "2024-03", "2024-04", "2024-05", "2024-06", "2024-07"]
    y-axis "Commits" 0 --> 700
    bar [634, 119, 101, 168, 237, 215, 137, 244, 116, 55, 130, 95]

The repository's most recent commit on master is 2024-07-27 (tag v1.10.1). Activity peaks correspond to release windows: August 2023 (v1.6), December 2023 (v1.7), February–March 2024 (v1.8), April 2024 (v1.9), July 2024 (v1.10). Earlier in the project's life, October 2022 (1,328 commits) was the highest-volume month.

The repository has had 653 unique authors. Top contributors by raw commit count (across the entire history):

Commits	Author
2,255	AUTOMATIC1111
1,331	AUTOMATIC (older alias)
314	w-e-w
168	DepFA
155	Aarni Koskela
132	catboxanon
121	Kohaku-Blueleaf
91	missionfloyd
83	brkirch
82	C43H66N12O12S2

(Two of the top entries are the same person under different commit-author strings.)

Bot-attributed commits

A grep over commit messages and Co-authored-by: trailers for [bot], dependabot, github-actions, copilot, etc. matches 0 commits. The repository does not currently use any automation that leaves bot signatures in git history. Inline AI tools (Copilot, IDE integrations) leave no trace and are not counted here.

Complexity

Average and median Python file size:

Metric	Value
Mean lines per .py file	~205
Median lines per .py file	~80
Files over 500 lines	16
Files over 1,000 lines	5

The five files over 1,000 lines (listed above) are reasonable candidates for extraction; in particular modules/processing.py hosts both StableDiffusionProcessing and the entire process_images_inner pipeline, and modules/ui.py builds every Gradio tab in one module.

The codebase's "deepest" import chains pass through shared.py → cmd_args / shared_options / shared_state. Most modules import shared directly, so it is effectively a service locator.

Tests and configuration

Metric	Value
Test files (test/test_*.py)	5
Lines of test code	~280
Test-to-code ratio (Python only)	~0.6%
Pinned Python dependencies	33 (in requirements_versions.txt)
Floating Python dependencies	33 (in requirements.txt)
Stable Diffusion model YAML configs	7 (in configs/)
Built-in extensions	12 (under extensions-builtin/)
Built-in scripts	12 (under scripts/)
Localisation files	shipped via extensions; the bundled localizations/ is empty
Command-line flags (cmd_args)	~130
User-visible options (shared_options)	~400

The tests target the API, not the UI; they hit /sdapi/v1/txt2img, /img2img, and /extra-single-image against a CPU-only test server. Coverage is functional rather than exhaustive.

Subsystem totals

Area	Files	Approx LoC
modules/ (top level)	~120	~31,500
modules/api/	2	~1,460
modules/textual_inversion/	7	~1,930
modules/hypernetworks/	2	~1,500
modules/processing_scripts/	4	~310
modules/models/	(sd3, diffusion submodules)	~600
extensions-builtin/Lora/	16	~2,600
extensions-builtin/ other	11	~5,800
scripts/ (one-shot scripts)	12	~3,400
javascript/	30	~5,068
test/	5	~280