By the numbers

Data collected on 2026-04-30, against main @ 44ccc72.

Size

The repo is dominated by TypeScript: roughly 70% of all source-line count is .ts + .tsx. The .json count is inflated by translation bundles under apps/web/public/static/locales/ and packages/i18n/locales/.

xychart-beta horizontal
    title "Lines of code by language"
    x-axis ["TypeScript (.ts)", "React (.tsx)", "JSON (i18n + config)", "Markdown", "CSS", "Prisma schema", "JavaScript"]
    y-axis "Lines" 0 --> 200000
    bar [163593, 131730, 196563, 24842, 14284, 2877, 1329]

File group	Files	Lines
.ts (excluding generated, node_modules, .next)	3,874	163,593
.tsx	1,149	131,730
.md	353	24,842
.json (incl. i18n)	many	196,563
.prisma	1 main schema	2,877
.css	small	14,284
.js	minimal	1,329

The Prisma schema alone is a single 2,877-line file with 100 models and 46 enums (packages/prisma/schema.prisma). The largest source file in the repo by line count is packages/features/bookings/lib/handleNewBooking/handleNewBooking.ts and its sibling modules.

Workspaces

• apps/: 3 deployable apps (web, api/v2, docs) plus a thin apps/api/index.js proxy entry
• packages/: ~30 first-class workspaces, plus 111 sub-packages under packages/app-store/*, plus several under packages/embeds/*, packages/features/*, packages/platform/*
• example-apps/: example integrations
• __checks__/: Checkly synthetic checks

The single largest workspace by directory count is packages/app-store/ with 111 integration directories.

Activity

xychart-beta horizontal
    title "Commits per month (last 12 months)"
    x-axis ["2025-05", "2025-06", "2025-07", "2025-08", "2025-09", "2025-10", "2025-11", "2025-12", "2026-01", "2026-02", "2026-03", "2026-04"]
    y-axis "Commits" 0 --> 700
    bar [283, 206, 292, 289, 373, 274, 248, 493, 618, 306, 90, 68]

Total commits to main: 16,429 since 2021-03-10. Unique authors across all of history: 937.

Churn hotspots (last 90 days)

File	Touches
apps/web/public/static/locales/en/common.json	30
yarn.lock	23
packages/i18n/locales/en/common.json	17
packages/prisma/schema.prisma	15
packages/features/bookings/repositories/BookingRepository.ts	15
packages/features/bookings/lib/service/RegularBookingService.ts	14
package.json	14
docs/api-reference/v2/openapi.json	13
apps/web/package.json	13

The BookingRepository.ts and RegularBookingService.ts numbers are a clear "hot spot" — the booking service is being actively refactored (see features/bookings).

Bot-attributed commits

Cal.com uses several bots for routine maintenance:

• 1,690 commits include a Co-authored-by: trailer pointing at a [bot] account (dependabot[bot], github-actions[bot], kodiak[bot], etc.). That is roughly 10.3% of total commits.
• The kodiak[bot] account in particular handles auto-merging based on .kodiak.toml.
• No factory-droid[bot] co-authorship is present in the history sampled.

Inline AI assistants (Copilot, Cursor, Claude in IDE) leave no trace in git history, so the actual share of AI-assisted work is necessarily higher than this lower bound.

Complexity signals

• Largest single Prisma table: the User model — the schema header for it is the busiest section of packages/prisma/schema.prisma and ties into nearly every domain.
• Deepest import fan-in: packages/lib/constants.ts, imported by hundreds of files.
• Deepest service: packages/features/bookings/lib/handleNewBooking/ — the booking pipeline is split across dozens of small modules under one directory.
• Test-to-code ratio: Vitest unit tests, Playwright E2E specs, and Jest specs in apps/api/v2. The apps/web/playwright/ tree alone is large enough to deserve its own subsystem write-up.

Per-subsystem stats

For every domain page in this wiki you will find an "Active contributors" byline and a "Key source files" table that counts files, recent commits, and bus-factor (unique committers in the last 90 days). See [features/bookings](features/bookings.md) for an example.