Source: https://seerepo.com/r/pallets/flask/built
Markdown source: https://seerepo.com/r/pallets/flask/built.md
Description: flask is a Python repo built with werkzeug. It signs people in with itsdangerous and makes its content with jinja2 and markupsafe.

# What is flask built with?

flask is a Python repo built with werkzeug. It signs people in with itsdangerous and makes its content with jinja2 and markupsafe. It has 18,393 written lines, with 49 test files.

Read on November 5, 2026, at commit 49943b5.

Repository: https://github.com/pallets/flask

## Backend

### Sign-in

- **itsdangerous**: 1 file

## Support

### The base

- **werkzeug**: 16 files

### Content

- **[jinja2](https://seerepo.com/uses/jinja2)**: 3 files
- **markupsafe**: 1 file

### Tools

- **click**: 4 files

### Other

- **blinker**: 1 file

## Other repos with a similar stack

- [Asabeneh/30-Days-Of-Python](https://seerepo.com/r/Asabeneh/30-Days-Of-Python/built): werkzeug, itsdangerous, jinja2, markupsafe · [Compare](https://seerepo.com/compare/Asabeneh/30-Days-Of-Python/vs/pallets/flask)
- [apache/superset](https://seerepo.com/r/apache/superset/built): werkzeug, itsdangerous, jinja2, markupsafe · [Compare](https://seerepo.com/compare/apache/superset/vs/pallets/flask)
- [comet-ml/opik](https://seerepo.com/r/comet-ml/opik/built): werkzeug, itsdangerous, jinja2, markupsafe · [Compare](https://seerepo.com/compare/comet-ml/opik/vs/pallets/flask)
- [vllm-project/vllm](https://seerepo.com/r/vllm-project/vllm/built): jinja2, markupsafe
- [neondatabase/neon](https://seerepo.com/r/neondatabase/neon/built): werkzeug, jinja2
- [NousResearch/hermes-agent](https://seerepo.com/r/NousResearch/hermes-agent/built): jinja2

## Frequently asked questions

### What language is flask written in?

flask is written in Python, with 18,393 written lines.

### What framework does flask use?

flask is built with werkzeug.

### What does flask sign people in with?

flask signs people in with itsdangerous.

### Does flask have tests?

Yes. flask has 49 test files.

### Which repos have a stack like flask's?

The ones that share most of its stack: Asabeneh/30-Days-Of-Python, apache/superset, and comet-ml/opik.

## 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.