Source: https://seerepo.com/compare/apache/airflow/vs/Stirling-Tools/Stirling-PDF
Markdown source: https://seerepo.com/compare/apache/airflow/vs/Stirling-Tools/Stirling-PDF.md
Description: airflow and Stirling-PDF share 3 technologies: React, Vite, and FastAPI. airflow is written in Python and Stirling-PDF in TypeScript.

# airflow vs Stirling-PDF

airflow and Stirling-PDF share 3 technologies: React, Vite, and FastAPI. airflow is written in Python and Stirling-PDF in TypeScript.

- [apache/airflow](https://seerepo.com/r/apache/airflow): Apache Airflow - A platform to programmatically author, schedule, and monitor workflows
- [Stirling-Tools/Stirling-PDF](https://seerepo.com/r/Stirling-Tools/Stirling-PDF): #1 PDF Application on GitHub that lets you edit PDFs on any device anywhere

## What they share and what sets them apart

- In common: React, Vite, FastAPI
- Only in airflow: Flask, Google
- Only in Stirling-PDF: Spring, Supabase, Postgres, Stripe, AWS S3, PostHog

## Side by side

| | airflow | Stirling-PDF |
|---|---|---|
| Size | 2,170,290 lines written, 4,573 code files | 1,123,883 lines written, 4,330 code files |
| Who writes it | 0.7% of its commits signed by AI. With Claude Code, GitHub Copilot, Cursor, and Devin | 2.1% of its commits signed by AI. With GitHub Copilot, Claude Code, and Codex |
| Activity | Last push October 30, 2026, 41,577 commits, 47,329 stars | Last push October 29, 2026, 5,704 commits, 95,347 stars |
| Tests | 4,898 test files. 52.9% of its code files have a test that imports them | 2,034 test files. 48.5% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, airflow or Stirling-PDF?

airflow, with 2,170,290 lines written in 4,573 code files; Stirling-PDF has 1,123,883 in 4,330.

The proof: [apache/airflow's code at commit 740d8bd](https://github.com/apache/airflow/tree/740d8bda336e226d2f12257f2a4e84742453fd07)

### Which has more GitHub stars, airflow or Stirling-PDF?

Stirling-PDF, with 95,347 stars; airflow has 47,329.

The proof: [Stirling-Tools/Stirling-PDF on GitHub](https://github.com/Stirling-Tools/Stirling-PDF)

### Which has more tests, airflow or Stirling-PDF?

airflow, with 4,898 test files; Stirling-PDF has 2,034.

The proof: [apache/airflow's code at commit 740d8bd](https://github.com/apache/airflow/tree/740d8bda336e226d2f12257f2a4e84742453fd07)

### Which was updated more recently, airflow or Stirling-PDF?

airflow: its last push was on October 30, 2026, and Stirling-PDF's on October 29, 2026.

The proof: [apache/airflow's commits on GitHub](https://github.com/apache/airflow/commits)

### Which has more commits signed by AI, airflow or Stirling-PDF?

Stirling-PDF: an AI signed 2.1% of its commits, with GitHub Copilot, Claude Code, and Codex; in airflow, 0.7%.

The proof: [the commits each tool signed in Stirling-Tools/Stirling-PDF](https://seerepo.com/r/Stirling-Tools/Stirling-PDF/ai)

## Sources

- apache/airflow: Read on October 31, 2026, at commit 740d8bd (https://github.com/apache/airflow/tree/740d8bda336e226d2f12257f2a4e84742453fd07)
- Stirling-Tools/Stirling-PDF: Read on October 29, 2026, at commit 025f763 (https://github.com/Stirling-Tools/Stirling-PDF/tree/025f763f015243327d0de9079403c0436a8504e2)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.