Source: https://seerepo.com/compare/pydantic/pydantic-ai/vs/vectorize-io/hindsight
Markdown source: https://seerepo.com/compare/pydantic/pydantic-ai/vs/vectorize-io/hindsight.md
Description: pydantic-ai and hindsight share 6 technologies: FastAPI, React, Rich, pydantic-ai-slim, Pydantic, and OpenTelemetry. Both are written in Python.

# pydantic-ai vs hindsight

pydantic-ai and hindsight share 6 technologies: FastAPI, React, Rich, pydantic-ai-slim, Pydantic, and OpenTelemetry. Both are written in Python.

- [pydantic/pydantic-ai](https://seerepo.com/r/pydantic/pydantic-ai): How Python does AI. Agents, realtime voice, image generation, embeddings. Every model, every interface, typed end to end.
- [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, React, Rich, pydantic-ai-slim, Pydantic, OpenTelemetry
- Only in pydantic-ai: anyio, Vite, dompurify, highlight.js, marked
- Only in hindsight: pgvector, psycopg2-binary, Postgres, Claude, Google, OpenAI, AIOHTTP, uvicorn, fastmcp, Tokio, Next.js, Preact, crossterm, indicatif, Ratatui, SQLAlchemy, alembic, cryptography, pyjwt, einops, Haystack, openai-agents, strands-agents, litellm, torch, CrewAI, google-adk, LangChain, llama-index-core, autogen-core, MCP, pillow, validator.v2, opentelemetry-api, opentelemetry-semantic-conventions, opentelemetry-exporter-otlp-proto-http, 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, @opencode-ai/plugin, js-yaml, @clack/prompts

## Side by side

| | pydantic-ai | hindsight |
|---|---|---|
| Size | 1,214,511 lines written, 1,068 code files | 749,226 lines written, 1,156 code files |
| Who writes it | 7.7% of its commits signed by AI. With Claude Code, Devin, GitHub Copilot, Cursor, and Codex | 6.8% of its commits signed by AI. With Claude Code, Cursor, Codex, and GitHub Copilot |
| Activity | Last push November 5, 2026, 5,276 commits, 21,037 stars | Last push November 5, 2026, 4,037 commits, 58,979 stars |
| Tests | 1,214 test files. 19% of its code files have a test that imports them | 1,333 test files. 30.2% 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, pydantic-ai or hindsight?

pydantic-ai, with 1,214,511 lines written; hindsight has 749,226.

The proof: [pydantic/pydantic-ai's code at commit c8bdab3](https://github.com/pydantic/pydantic-ai/tree/c8bdab333f248d09fa61cf32144fecad70e88fa9)

### Which has more GitHub stars, pydantic-ai or hindsight?

hindsight, with 58,979 stars; pydantic-ai has 21,037.

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

### Which has more tests, pydantic-ai or hindsight?

hindsight, with 1,333 test files; pydantic-ai has 1,214.

The proof: [vectorize-io/hindsight's code at commit ee3bd04](https://github.com/vectorize-io/hindsight/tree/ee3bd049ebe3b96b7d1120328429102100c1e28e)

### Which was updated more recently, pydantic-ai or hindsight?

Both got their last push on November 5, 2026.

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

### Which has more commits signed by AI, pydantic-ai or hindsight?

pydantic-ai: an AI signed 7.7% of its commits, with Claude Code, Devin, GitHub Copilot, Cursor, and Codex; in hindsight, 6.8%.

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

## Sources

- pydantic/pydantic-ai: Read on November 5, 2026, at commit c8bdab3 (https://github.com/pydantic/pydantic-ai/tree/c8bdab333f248d09fa61cf32144fecad70e88fa9)
- vectorize-io/hindsight: Read on November 5, 2026, at commit ee3bd04 (https://github.com/vectorize-io/hindsight/tree/ee3bd049ebe3b96b7d1120328429102100c1e28e)

## 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.