The best-tested open source Flask repos

The repos, ranked

1. 1.

   mitmproxy/mitmproxy

   An interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers.

   68.5% of its code files have a test that imports them · 349 test files

   Python46.5kAI 0.1%What it’s built with
2. 2.

   langgenius/dify

   Build Agentic workflows, RAG pipelines, with rich AI model and tool support on one collaborative workspace. Deploy on cloud, VPC, or self-hosted, so teams move from prototype to production without rebuilding the stack.

   65.5% of its code files have a test that imports them · 4,495 test files

   Python+4159.9kAI 5.1%What it’s built withThe AI
3. 3.

   apache/superset

   Apache Superset is a Data Visualization and Data Exploration Platform

   61.6% of its code files have a test that imports them · 3,014 test files

   Python+175.4kAI 9.1%What it’s built withThe AI
4. 4.

   apache/airflow

   Apache Airflow - A platform to programmatically author, schedule, and monitor workflows

   52.9% of its code files have a test that imports them · 4,898 test files

   Python+147.3kAI 0.7%What it’s built withThe AI
5. 5.

   666ghj/MiroFish

   A Simple and Universal Swarm Intelligence Engine, Predicting Anything. 简洁通用的群体智能引擎，预测万物

   37.9% of its code files have a test that imports them · 21 test files

   Python82.7kAI 2%What it’s built with
6. 6.

   trycua/cua

   Scale computer-use 2.0 with open-source drivers, cross-OS sandboxes, and benchmarks for training, evaluation, and data generation.

   26.8% of its code files have a test that imports them · 1,988 test files

   Rust+531.5kAI 27.8%What it’s built withThe AI
7. 7.

   BerriAI/litellm

   The fastest, litest AI Gateway. Rust core with Python SDK. Call 100+ LLM APIs in OpenAI (or native) format with cost tracking, guardrails, load balancing, and logging [Bedrock, Azure, OpenAI, Anthropic, OpenAI, VertexAI, vLLM, Nvidia NIM]

   21.7% of its code files have a test that imports them · 6,741 test files

   Python+662.4kAI 20%What it’s built withThe AI
8. 8.

   hasura/graphql-engine

   Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access control, also trigger webhooks on database events.

   18.3% of its code files have a test that imports them · 659 test files

   TypeScript+732.1kWhat it’s built with
9. 9.

   xtekky/gpt4free

   The official gpt4free repository | various collection of powerful language models | opus 4.6 gpt 5.3 kimi 2.5 deepseek v3.2 gemini 3

   18% of its code files have a test that imports them · 54 test files

   Python67kAI 2.6%What it’s built withThe AI
10. 10.

    666ghj/BettaFish

    微舆：人人可用的多Agent舆情分析助手，打破信息茧房，还原舆情原貌，预测未来走向，辅助决策！从0实现，不依赖任何框架。

    11.5% of its code files have a test that imports them · 15 test files

    Python+242.6kAI 0.7%What it’s built with
11. 11.

    ankitects/anki

    Anki is a smart spaced repetition flashcard program

    8.4% of its code files have a test that imports them · 73 test files

    Rust32.5kWhat it’s built with
12. 12.

    geekcomputers/Python

    My Python Examples

    0.4% of its code files have a test that imports them · 14 test files

    Python+235.5kWhat it’s built with

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