Source: https://seerepo.com/compare/slackhq/nebula/vs/syncthing/syncthing
Markdown source: https://seerepo.com/compare/slackhq/nebula/vs/syncthing/syncthing.md
Description: nebula and syncthing share 3 technologies: net/http, github.com/rcrowley/go-metrics, and Prometheus. Both are written in Go.

# nebula vs syncthing

nebula and syncthing share 3 technologies: net/http, github.com/rcrowley/go-metrics, and Prometheus. Both are written in Go.

- [slackhq/nebula](https://seerepo.com/r/slackhq/nebula): A scalable overlay networking tool with a focus on performance, simplicity and security
- [syncthing/syncthing](https://seerepo.com/r/syncthing/syncthing): Open Source Continuous File Synchronization

## What they share and what sets them apart

- In common: net/http, github.com/rcrowley/go-metrics, Prometheus
- Only in nebula: github.com/skip2/go-qrcode, github.com/kardianos/service
- Only in syncthing: github.com/julienschmidt/httprouter, go-sqlite3, HashiCorp, SQLite, github.com/syndtr/goleveldb, RabbitMQ, github.com/jmoiron/sqlx, github.com/go-ldap/ldap/v3, github.com/vitrun/qart, go, buf.build/go/protovalidate, github.com/getsentry/raven-go, github.com/aws/aws-sdk-go

## Side by side

| | nebula | syncthing |
|---|---|---|
| Size | 83,436 lines written, 208 code files | 114,951 lines written, 431 code files |
| Who writes it | 1% of its commits signed by AI. With Claude Code | 0% of its commits signed by AI |
| Activity | Last push November 3, 2026, 865 commits, 18,507 stars | Last push November 10, 2026, 7,415 commits, 90,399 stars |
| Tests | 153 test files. 78.8% of its code files have a test that imports them | 144 test files. 44.1% 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, nebula or syncthing?

syncthing, with 114,951 lines written; nebula has 83,436.

The proof: [syncthing/syncthing's code at commit ed2e0fd](https://github.com/syncthing/syncthing/tree/ed2e0fd441cf4ed797f6dee6e3db4d1a6ddb82f5)

### Which has more GitHub stars, nebula or syncthing?

syncthing, with 90,399 stars; nebula has 18,507.

The proof: [syncthing/syncthing on GitHub](https://github.com/syncthing/syncthing)

### Which has more tests, nebula or syncthing?

nebula, with 153 test files; syncthing has 144.

The proof: [slackhq/nebula's code at commit fb4ef13](https://github.com/slackhq/nebula/tree/fb4ef139cbb4af67d142c72083fb735f56460e50)

### Which was updated more recently, nebula or syncthing?

syncthing: its last push was on November 10, 2026, and nebula's on November 3, 2026.

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

### Which has more commits signed by AI, nebula or syncthing?

nebula: an AI signed 1% of its commits, with Claude Code.

## Sources

- slackhq/nebula: Read on November 6, 2026, at commit fb4ef13 (https://github.com/slackhq/nebula/tree/fb4ef139cbb4af67d142c72083fb735f56460e50)
- syncthing/syncthing: Read on November 12, 2026, at commit ed2e0fd (https://github.com/syncthing/syncthing/tree/ed2e0fd441cf4ed797f6dee6e3db4d1a6ddb82f5)

## 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.