Source: https://seerepo.com/compare/a2ui-project/a2ui/vs/vectorize-io/hindsight
Markdown source: https://seerepo.com/compare/a2ui-project/a2ui/vs/vectorize-io/hindsight.md
Description: a2ui and hindsight share 8 technologies: Google, MCP, React, OpenAI, google-adk, Pydantic, Zod, and js-yaml. a2ui is written in TypeScript and hindsight in Python.

# a2ui vs hindsight

a2ui and hindsight share 8 technologies: Google, MCP, React, OpenAI, google-adk, Pydantic, Zod, and js-yaml. a2ui is written in TypeScript and hindsight in Python.

- [a2ui-project/a2ui](https://seerepo.com/r/a2ui-project/a2ui): Open-source generative UI framework: agents stream layout data, and apps render it with native components in React, Angular, Lit, Flutter, SwiftUI and Jetpack Compose.
- [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: Google, MCP, React, OpenAI, google-adk, Pydantic, Zod, js-yaml
- Only in a2ui: Flutter, anyio, Lit, Angular, furo, mkdocs-material, video_player, a2ui-agent-sdk, a2ui-core, myst-parser, Yams, flutter_markdown_plus, jsonschema, referencing, com.networknt:json-schema-validator, logging, Ajv, vega-embed, zod-to-json-schema, validate-color, yaml, dompurify, markdown-it
- Only in hindsight: FastAPI, pgvector, psycopg2-binary, Postgres, Claude, AIOHTTP, uvicorn, fastmcp, Tokio, Next.js, Preact, Rich, crossterm, indicatif, Ratatui, SQLAlchemy, alembic, cryptography, pyjwt, einops, Haystack, openai-agents, pydantic-ai-slim, strands-agents, litellm, torch, CrewAI, LangChain, llama-index-core, autogen-core, pillow, validator.v2, opentelemetry-api, opentelemetry-semantic-conventions, OpenTelemetry, 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, @opencode-ai/plugin, @clack/prompts

## Side by side

| | a2ui | hindsight |
|---|---|---|
| Size | 662,704 lines written, 1,229 code files | 749,226 lines written, 1,156 code files |
| Who writes it | 1.9% of its commits signed by AI. With Gemini CLI | 6.8% of its commits signed by AI. With Claude Code, Cursor, Codex, and GitHub Copilot |
| Activity | Last push November 7, 2026, 1,810 commits, 17,001 stars | Last push November 5, 2026, 4,037 commits, 58,979 stars |
| Tests | 1,165 test files. 44.9% 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, a2ui or hindsight?

hindsight, with 749,226 lines written; a2ui has 662,704.

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

### Which has more GitHub stars, a2ui or hindsight?

hindsight, with 58,979 stars; a2ui has 17,001.

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

### Which has more tests, a2ui or hindsight?

hindsight, with 1,333 test files; a2ui has 1,165.

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

### Which was updated more recently, a2ui or hindsight?

a2ui: its last push was on November 7, 2026, and hindsight's on November 5, 2026.

The proof: [a2ui-project/a2ui's commits on GitHub](https://github.com/a2ui-project/a2ui/commits)

### Which has more commits signed by AI, a2ui or hindsight?

hindsight: an AI signed 6.8% of its commits, with Claude Code, Cursor, Codex, and GitHub Copilot; in a2ui, 1.9%.

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

## Sources

- a2ui-project/a2ui: Read on November 7, 2026, at commit 07aa6a7 (https://github.com/a2ui-project/a2ui/tree/07aa6a72f9a81ec8d1f9461957af90b40cc75761)
- 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.