Source: https://seerepo.com/compare/mem0ai/mem0/vs/simstudioai/sim
Markdown source: https://seerepo.com/compare/mem0ai/mem0/vs/simstudioai/sim.md
Description: mem0 and sim share 8 technologies: FastAPI, Postgres, Redis, MongoDB, OpenAI, PostHog, Anthropic, and AWS S3. mem0 is written in Python and sim in TypeScript.

# mem0 vs sim

mem0 and sim share 8 technologies: FastAPI, Postgres, Redis, MongoDB, OpenAI, PostHog, Anthropic, and AWS S3. mem0 is written in Python and sim in TypeScript.

- [mem0ai/mem0](https://seerepo.com/r/mem0ai/mem0): The Memory Layer for AI Agents - Drop-in memory infrastructure for AI agents and apps. Context that persists. Built for production.
- [simstudioai/sim](https://seerepo.com/r/simstudioai/sim): Sim is the collaborative workspace to build, deploy, and monitor AI agents and workflows. Used by 100,000+ builders.

## What they share and what sets them apart

- In common: FastAPI, Postgres, Redis, MongoDB, OpenAI, PostHog, Anthropic, AWS S3
- Only in mem0: Supabase
- Only in sim: Next.js, React, MCP, Stripe, Resend

## Side by side

| | mem0 | sim |
|---|---|---|
| Size | 234,363 lines written, 636 code files | 4,073,540 lines written, 10,948 code files |
| Who writes it | 3.6% of its commits signed by AI. With Claude Code and Cursor | 5.3% of its commits signed by AI. With Claude Code, Cursor, and Codex |
| Activity | Last push October 29, 2026, 2,650 commits, 68,064 stars | Last push November 2, 2026, 8,178 commits, 29,966 stars |
| Tests | 324 test files. 46.2% of its code files have a test that imports them | 3,682 test files. 38.4% 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, mem0 or sim?

sim, with 4,073,540 lines written in 10,948 code files; mem0 has 234,363 in 636.

The proof: [simstudioai/sim's code at commit df7709b](https://github.com/simstudioai/sim/tree/df7709bf5be6a42d51c5289364b98d32c4d38240)

### Which has more GitHub stars, mem0 or sim?

mem0, with 68,064 stars; sim has 29,966.

The proof: [mem0ai/mem0 on GitHub](https://github.com/mem0ai/mem0)

### Which has more tests, mem0 or sim?

sim, with 3,682 test files; mem0 has 324.

The proof: [simstudioai/sim's code at commit df7709b](https://github.com/simstudioai/sim/tree/df7709bf5be6a42d51c5289364b98d32c4d38240)

### Which was updated more recently, mem0 or sim?

sim: its last push was on November 2, 2026, and mem0's on October 29, 2026.

The proof: [simstudioai/sim's commits on GitHub](https://github.com/simstudioai/sim/commits)

### Which has more commits signed by AI, mem0 or sim?

sim: an AI signed 5.3% of its commits, with Claude Code, Cursor, and Codex; in mem0, 3.6%.

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

## Sources

- mem0ai/mem0: Read on October 30, 2026, at commit 26cdefb (https://github.com/mem0ai/mem0/tree/26cdefb46600c0fa5953c4b5ee5003c125539fc4)
- simstudioai/sim: Read on November 2, 2026, at commit df7709b (https://github.com/simstudioai/sim/tree/df7709bf5be6a42d51c5289364b98d32c4d38240)

## 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.