Source: https://seerepo.com/compare/ag-ui-protocol/ag-ui/vs/vectorize-io/hindsight
Markdown source: https://seerepo.com/compare/ag-ui-protocol/ag-ui/vs/vectorize-io/hindsight.md
Description: ag-ui and hindsight share 22 technologies: FastAPI, AIOHTTP, Tokio, uvicorn, React, Next.js, MCP, openai-agents, strands-agents, google-adk, CrewAI, LangChain, litellm, Pydantic, Tailwind CSS, next-themes, class-variance-authority, tailwind-merge, Radix UI, Lucide, Zod, and ai. Both are written in Python.

# ag-ui vs hindsight

ag-ui and hindsight share 22 technologies: FastAPI, AIOHTTP, Tokio, uvicorn, React, Next.js, MCP, openai-agents, strands-agents, google-adk, CrewAI, LangChain, litellm, Pydantic, Tailwind CSS, next-themes, class-variance-authority, tailwind-merge, Radix UI, Lucide, Zod, and ai. Both are written in Python.

- [ag-ui-protocol/ag-ui](https://seerepo.com/r/ag-ui-protocol/ag-ui): AG-UI: the Agent-User Interaction Protocol. Bring Agents into Frontend Applications.
- [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, AIOHTTP, Tokio, uvicorn, React, Next.js, MCP, openai-agents, strands-agents, google-adk, CrewAI, LangChain, litellm, Pydantic, Tailwind CSS, next-themes, class-variance-authority, tailwind-merge, Radix UI, Lucide, Zod, ai
- Only in ag-ui: ASP.NET Core, Spring, activity-compose, core-ktx, java-server, Express, Hono, @mastra/libsql, PostHog, go, Microsoft.Extensions.AI.Abstractions, spring-ai-bom, spring-ai-client-chat, Microsoft.Extensions.AI, ag-ui-a2ui-toolkit, google-antigravity, LangGraph, langroid, coil-compose, io.ktor:ktor-client-logging, slf4j-simple, github.com/sirupsen/logrus, log, @a2ui/web_core, @copilotkit/react-ui, @monaco-editor/react, embla-carousel-react, tiptap, @phosphor-icons/react, copilotkit, mastra, @a2a-js/sdk, @langchain/openai, streamdown, markdown-it, zod-to-json-schema, @cfworker/json-schema, @strands-agents/sdk, @omnara/sdk, yaml, @copilotkit/runtime, Ajv
- Only in hindsight: pgvector, psycopg2-binary, Postgres, Claude, Google, OpenAI, fastmcp, Preact, Rich, crossterm, indicatif, Ratatui, SQLAlchemy, alembic, cryptography, pyjwt, einops, Haystack, pydantic-ai-slim, torch, llama-index-core, autogen-core, pillow, validator.v2, opentelemetry-api, opentelemetry-semantic-conventions, OpenTelemetry, opentelemetry-exporter-otlp-proto-http, opentelemetry-instrumentation-fastapi, @tailwindcss/postcss, PostCSS, sonner, react18-json-view, recharts, cmdk, react-markdown, remark-gfm, @opencode-ai/plugin, js-yaml, @clack/prompts

## Side by side

| | ag-ui | hindsight |
|---|---|---|
| Size | 879,462 lines written, 1,084 code files | 749,226 lines written, 1,156 code files |
| Who writes it | 22.7% of its commits signed by AI. With Claude Code, Codex, GitHub Copilot, and Cursor | 6.8% of its commits signed by AI. With Claude Code, Cursor, Codex, and GitHub Copilot |
| Activity | Last push November 6, 2026, 3,939 commits, 17,052 stars | Last push November 5, 2026, 4,037 commits, 58,979 stars |
| Tests | 1,756 test files. 60.9% 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, ag-ui or hindsight?

ag-ui, with 879,462 lines written; hindsight has 749,226.

The proof: [ag-ui-protocol/ag-ui's code at commit 37b4da9](https://github.com/ag-ui-protocol/ag-ui/tree/37b4da90c8dfba2b7ef2182c738fda5350f0fc60)

### Which has more GitHub stars, ag-ui or hindsight?

hindsight, with 58,979 stars; ag-ui has 17,052.

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

### Which has more tests, ag-ui or hindsight?

ag-ui, with 1,756 test files; hindsight has 1,333.

The proof: [ag-ui-protocol/ag-ui's code at commit 37b4da9](https://github.com/ag-ui-protocol/ag-ui/tree/37b4da90c8dfba2b7ef2182c738fda5350f0fc60)

### Which was updated more recently, ag-ui or hindsight?

ag-ui: its last push was on November 6, 2026, and hindsight's on November 5, 2026.

The proof: [ag-ui-protocol/ag-ui's commits on GitHub](https://github.com/ag-ui-protocol/ag-ui/commits)

### Which has more commits signed by AI, ag-ui or hindsight?

ag-ui: an AI signed 22.7% of its commits, with Claude Code, Codex, GitHub Copilot, and Cursor; in hindsight, 6.8%.

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

## Sources

- ag-ui-protocol/ag-ui: Read on November 7, 2026, at commit 37b4da9 (https://github.com/ag-ui-protocol/ag-ui/tree/37b4da90c8dfba2b7ef2182c738fda5350f0fc60)
- 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.