Source: https://seerepo.com/compare/onlook-dev/onlook/vs/Stirling-Tools/Stirling-PDF
Markdown source: https://seerepo.com/compare/onlook-dev/onlook/vs/Stirling-Tools/Stirling-PDF.md
Description: onlook and Stirling-PDF share 5 technologies: React, Supabase, Postgres, PostHog, and Stripe. Both are written in TypeScript.

# onlook vs Stirling-PDF

onlook and Stirling-PDF share 5 technologies: React, Supabase, Postgres, PostHog, and Stripe. Both are written in TypeScript.

- [onlook-dev/onlook](https://seerepo.com/r/onlook-dev/onlook): The Developer Tool for Visual Engineers • An Open-Source AI-First Design tool • Visually build, style, and edit your code with AI • World's best, top-most agent recommended #1 Developer tool for Designers and Visual Engineers to design with Real Code.
- [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, Supabase, Postgres, PostHog, Stripe
- Only in onlook: Next.js, GitHub, Resend
- Only in Stirling-PDF: Vite, FastAPI, Spring, AWS S3

## Side by side

| | onlook | Stirling-PDF |
|---|---|---|
| Size | 151,760 lines written, 1,047 code files | 1,123,883 lines written, 4,330 code files |
| Who writes it | 5% of its commits signed by AI. With Devin, Claude Code, and GitHub Copilot | 2.1% of its commits signed by AI. With GitHub Copilot, Claude Code, and Codex |
| Activity | Last push October 21, 2026, 1,620 commits, 27,084 stars | Last push October 29, 2026, 5,704 commits, 95,347 stars |
| Tests | 234 test files. 5.4% 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, onlook or Stirling-PDF?

Stirling-PDF, with 1,123,883 lines written in 4,330 code files; onlook has 151,760 in 1,047.

The proof: [Stirling-Tools/Stirling-PDF's code at commit 025f763](https://github.com/Stirling-Tools/Stirling-PDF/tree/025f763f015243327d0de9079403c0436a8504e2)

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

Stirling-PDF, with 95,347 stars; onlook has 27,084.

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

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

Stirling-PDF, with 2,034 test files; onlook has 234.

The proof: [Stirling-Tools/Stirling-PDF's code at commit 025f763](https://github.com/Stirling-Tools/Stirling-PDF/tree/025f763f015243327d0de9079403c0436a8504e2)

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

Stirling-PDF: its last push was on October 29, 2026, and onlook's on October 21, 2026.

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

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

onlook: an AI signed 5% of its commits, with Devin, Claude Code, and GitHub Copilot; in Stirling-PDF, 2.1%.

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

## Sources

- onlook-dev/onlook: Read on November 2, 2026, at commit 423e2e9 (https://github.com/onlook-dev/onlook/tree/423e2e924366419e418ee049093872d535eea41a)
- 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.