Source: https://seerepo.com/compare/emcie-co/parlant/vs/langflow-ai/langflow
Markdown source: https://seerepo.com/compare/emcie-co/parlant/vs/langflow-ai/langflow.md
Description: parlant and langflow share 16 technologies: FastAPI, OpenAI, uvicorn, Vite, React, Rich, MCP, jsonschema, boto3, Tailwind CSS, tailwind-merge, class-variance-authority, Radix UI, Lucide, rehype-raw, and remark-gfm. Both are written in Python.

# parlant vs langflow

parlant and langflow share 16 technologies: FastAPI, OpenAI, uvicorn, Vite, React, Rich, MCP, jsonschema, boto3, Tailwind CSS, tailwind-merge, class-variance-authority, Radix UI, Lucide, rehype-raw, and remark-gfm. Both are written in Python.

- [emcie-co/parlant](https://seerepo.com/r/emcie-co/parlant): Parlant is an open platform for building customer-facing chat agents with AI. Describe how the agent should behave, and your coding agent implements it for you.
- [langflow-ai/langflow](https://seerepo.com/r/langflow-ai/langflow): Langflow is a powerful tool for building and deploying AI-powered agents and workflows.

## What they share and what sets them apart

- In common: FastAPI, OpenAI, uvicorn, Vite, React, Rich, MCP, jsonschema, boto3, Tailwind CSS, tailwind-merge, class-variance-authority, Radix UI, Lucide, rehype-raw, remark-gfm
- Only in parlant: starlette, aiosqlite, SQLite, nano-vectordb, fastmcp, authlib, keyring, tokenizers, tiktoken, jinja2, openapi3-parser, coloredlogs, OpenTelemetry, opentelemetry-instrumentation, structlog, next-themes, sonner, react-resizable-panels, CodeMirror, TanStack, vaul, rehype-highlight, streamdown
- Only in langflow: pyarrow, oracledb, Redis, Google, AIOHTTP, react-router-dom, SQLAlchemy, cryptography, pyjwt, bcrypt, google-auth-oauthlib, firecrawl-py, LangChain, langchain-classic, exa-py, pillow, defusedxml, pypdf, markitdown, Pydantic, msgspec, validators, psutil, loguru, xyflow, ag-grid-community, Framer, react-hotkeys-hook, use-stick-to-bottom, react-syntax-highlighter, ace-builds, Headless UI, cmdk, elkjs, react-day-picker, react-error-boundary, react-sortablejs, reactflow, react-icons, @radix-ui/react-icons, react-markdown, dompurify, rehype-sanitize

## Side by side

| | parlant | langflow |
|---|---|---|
| Size | 214,893 lines written, 334 code files | 1,446,517 lines written, 3,937 code files |
| Who writes it | 1.1% of its commits signed by AI. With Claude Code, Codex, and GitHub Copilot | 1.5% of its commits signed by AI. With Claude Code, CodeRabbit, GitHub Copilot, Cursor, Codex, and Warp |
| Activity | Last push November 6, 2026, 5,148 commits, 18,325 stars | Last push November 4, 2026, 17,600 commits, 156,316 stars |
| Tests | 257 test files. 57.5% of its code files have a test that imports them | 3,083 test files. 35.1% 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, parlant or langflow?

langflow, with 1,446,517 lines written; parlant has 214,893.

The proof: [langflow-ai/langflow's code at commit 60999cc](https://github.com/langflow-ai/langflow/tree/60999cc9a7350e44dde3ef641baae864e10861f0)

### Which has more GitHub stars, parlant or langflow?

langflow, with 156,316 stars; parlant has 18,325.

The proof: [langflow-ai/langflow on GitHub](https://github.com/langflow-ai/langflow)

### Which has more tests, parlant or langflow?

langflow, with 3,083 test files; parlant has 257.

The proof: [langflow-ai/langflow's code at commit 60999cc](https://github.com/langflow-ai/langflow/tree/60999cc9a7350e44dde3ef641baae864e10861f0)

### Which was updated more recently, parlant or langflow?

parlant: its last push was on November 6, 2026, and langflow's on November 4, 2026.

The proof: [emcie-co/parlant's commits on GitHub](https://github.com/emcie-co/parlant/commits)

### Which has more commits signed by AI, parlant or langflow?

langflow: an AI signed 1.5% of its commits, with Claude Code, CodeRabbit, GitHub Copilot, Cursor, Codex, and Warp; in parlant, 1.1%.

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

## Sources

- emcie-co/parlant: Read on November 6, 2026, at commit a071a81 (https://github.com/emcie-co/parlant/tree/a071a81406e47b4a0ae3bfd448e4deb170ac2f4b)
- langflow-ai/langflow: Read on November 4, 2026, at commit 60999cc (https://github.com/langflow-ai/langflow/tree/60999cc9a7350e44dde3ef641baae864e10861f0)

## 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.