Source: https://seerepo.com/compare/OpenPipe/ART/vs/vectorize-io/hindsight
Markdown source: https://seerepo.com/compare/OpenPipe/ART/vs/vectorize-io/hindsight.md
Description: ART and hindsight share 7 technologies: FastAPI, OpenAI, Anthropic, AIOHTTP, torch, litellm, and Pydantic. Both are written in Python.

# ART vs hindsight

ART and hindsight share 7 technologies: FastAPI, OpenAI, Anthropic, AIOHTTP, torch, litellm, and Pydantic. Both are written in Python.

- [OpenPipe/ART](https://seerepo.com/r/OpenPipe/ART): Agent Reinforcement Trainer: train multi-step agents for real-world tasks using GRPO. Give your agents on-the-job training. Reinforcement learning for Qwen3.6, GPT-OSS, Llama, and more!
- [vectorize-io/hindsight](https://seerepo.com/r/vectorize-io/hindsight): Hindsight: Agent Memory That Learns

## What they share and what sets them apart

- In common: FastAPI, OpenAI, Anthropic, AIOHTTP, torch, litellm, Pydantic
- Only in ART: weave, apache-tvm-ffi, causal-conv1d, flash-attn-4, flash-linear-attention, flashinfer-python, megatron-core, ml-dtypes, NVIDIA, quack-kernels, torchtune, unsloth-zoo, transformers, peft, msgspec
- Only in hindsight: pg0-embedded, pgvector, psycopg2-binary, Postgres, Google, uvicorn, fastmcp, Tokio, Next.js, React, Preact, @paperclipai/plugin-sdk, Rich, crossterm, indicatif, Ratatui, SQLAlchemy, alembic, pyjwt, ag2, agent-framework-core, einops, Haystack, hindsight-api-slim, openai-agents, Pipecat, pydantic-ai-slim, strands-agents, toktok-rs, torchvision, hindsight-api, hindsight-client, dify-plugin, hindsight-embed, CrewAI, google-adk, LangChain, llama-index-core, safety-agent, agno, autogen-core, flashrank, MCP, smolagents, pillow, validator.v2, metricreader.--init--, opentelemetry-semantic-conventions, OpenTelemetry, opentelemetry-exporter-prometheus, opentelemetry-instrumentation-fastapi, Tailwind CSS, class-variance-authority, @tailwindcss/postcss, PostCSS, next-themes, tailwind-merge, sonner, Radix UI, react18-json-view, recharts, cmdk, Lucide, react-markdown, remark-gfm, ai, Zod, Cloudflare, @opencode-ai/plugin, @elizaos/core, eve, js-yaml, @clack/prompts

## Side by side

| | ART | hindsight |
|---|---|---|
| Size | 345,462 lines written, 415 code files | 775,545 lines written, 1,263 code files |
| Who writes it | 6.6% of its commits signed by AI. With Claude Code, Cursor, Codex, and Amp | 6.8% of its commits signed by AI. With Claude Code, Cursor, Codex, and GitHub Copilot |
| Activity | Last push November 10, 2026, 1,465 commits, 10,856 stars | Last push November 12, 2026, 4,120 commits, 60,699 stars |
| Tests | 391 test files. 49.2% of its code files have a test that imports them | 1,381 test files. 28.2% 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, ART or hindsight?

hindsight, with 775,545 lines written; ART has 345,462.

The proof: [vectorize-io/hindsight's code at commit 9a730fa](https://github.com/vectorize-io/hindsight/tree/9a730fa95a6453785341adaa436a9453ed5ebf7e)

### Which has more GitHub stars, ART or hindsight?

hindsight, with 60,699 stars; ART has 10,856.

The proof: [vectorize-io/hindsight on GitHub](https://github.com/vectorize-io/hindsight)

### Which has more tests, ART or hindsight?

hindsight, with 1,381 test files; ART has 391.

The proof: [vectorize-io/hindsight's code at commit 9a730fa](https://github.com/vectorize-io/hindsight/tree/9a730fa95a6453785341adaa436a9453ed5ebf7e)

### Which was updated more recently, ART or hindsight?

hindsight: its last push was on November 12, 2026, and ART's on November 10, 2026.

The proof: [vectorize-io/hindsight's commits on GitHub](https://github.com/vectorize-io/hindsight/commits)

### Which has more commits signed by AI, ART or hindsight?

hindsight: an AI signed 6.8% of its commits, with Claude Code, Cursor, Codex, and GitHub Copilot; in ART, 6.6%.

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

## Sources

- OpenPipe/ART: Read on November 13, 2026, at commit 534620a (https://github.com/OpenPipe/ART/tree/534620a41b82ed89667f4642cc0b8e1d00e2269b)
- vectorize-io/hindsight: Read on November 13, 2026, at commit 9a730fa (https://github.com/vectorize-io/hindsight/tree/9a730fa95a6453785341adaa436a9453ed5ebf7e)

## 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.