# Mem0 vs LangChain: license, pricing and features compared (October 2026)

Canonical: https://theagenticweekly.com/compare/mem0-vs-langchain · Last verified: 2026-10-26 · Published: 2026-10-25 · Author: Agentic Weekly (operated independently from Texas, US) · Evidence: Evidence: Both tools have a Tested entry (scope on each tool page). The facts in the tables were read from each vendor's own pages and the public GitHub API on 2026-10-25 (America/Chicago) and are Reported. The What we measured section lists what we have actually run, with links to the test logs, and what we have not run yet; anything we could not confirm is marked as not captured.

**Our pick:** Pick Mem0 for apps that need long-term per-user memory; pick LangChain for developers who want the widest set of integrations. No overall winner: we have not benchmarked them against each other. **Updated:** 2026-10-26 (America/Chicago).

> Mem0 and LangChain are both listed under Agent building. Pricing model: Mem0 is "Freemium"; LangChain is "Free and open source". License: Mem0 is Apache-2.0; LangChain is MIT. Mem0 is the better fit for: apps that need long-term per-user memory. LangChain is the better fit for: developers who want the widest set of integrations. Facts were read from vendor and GitHub pages on Oct 25, 2026 and are Reported; what we ran ourselves is under What we measured.

## What we measured

We ran both Mem0 and LangChain ourselves; the table links each full test log. These are smoke tests on one CPU-only machine, not benchmarks. Each tool had its own task, so the two results are not a head-to-head. Model-driven runs used a small local Qwen2.5-3B-Instruct model.

Table: Our own tests for Mem0 and LangChain

| Test | Mem0 | LangChain |
|---|---|---|
| Hands-on test log (install and a real task) | Tested: Mem0 mem0ai 2.2.1 (open-source Python SDK), Oct 26, 2026: passed. Mem0's open-source SDK 2.2.1 stored a fact from one chat message with a local 3B model and retrieved it with a semantic search (2.04 s) on the second attempt; the first… [Full test log](https://theagenticweekly.com/tests/mem0) | Tested: LangChain 1.4.7, Oct 25, 2026: passed. LangChain 1.4.7 passed our one-tool task on a local 3B model: 3 of 3 trials; cold uv install 0.8 s. [Full test log](https://theagenticweekly.com/tests/langchain) |

How we test and label results: [methodology](https://theagenticweekly.com/methodology#testing-rig). All test logs: [test hub](https://theagenticweekly.com/tests).

## Mem0 vs LangChain at a glance

Mem0 and LangChain are both listed under Agent building. Mem0: Open-source and hosted memory layer that lets agents remember users across sessions, with a free tier and published request quotas. LangChain: Open-source framework for building LLM applications and agents in Python and JavaScript, from the team behind LangGraph and LangSmith.

Table: Mem0 and LangChain side by side (vendor pages and GitHub, 2026-10-25)

|  | Mem0 | LangChain |
|---|---|---|
| Vendor | Mem0 | LangChain |
| Listed under | Agent building | Agent building |
| License | Apache-2.0 | MIT |
| Pricing model | Freemium | Free and open source |
| Free tier | Free: 10,000 add requests and 1,000 retrieval requests per month | Free to self-host |
| Paid plans | $19 per month (50,000 add / 5,000 retrieval); $249 per month (500,000 add / 50,000 retrieval); Enterprise custom | None listed for the library |
| Platforms | API, Python and JS SDKs, open-source self-host | Python and JavaScript libraries |
| Public repository | mem0ai/mem0: 67,804 stars, last push Oct 23, 2026 UTC (GitHub API, Oct 25, 2026) | langchain-ai/langchain: 148,451 stars, last push Oct 25, 2026 UTC (GitHub API, Oct 25, 2026) |
| Latest release we saw | Python SDK v2.2.1, Sep 25, 2026 | langchain-core 1.7.0, Oct 22, 2026 |
| Evidence | Tested (scope on its tool page) | Tested (scope on its tool page) |

## How Mem0 and LangChain differ

- Pricing model: Mem0 is "Freemium"; LangChain is "Free and open source".
- License: Mem0 is Apache-2.0; LangChain is MIT.
- GitHub stars on Oct 25, 2026: LangChain 148,451 (langchain-ai/langchain) vs Mem0 67,804 (mem0ai/mem0). Stars measure attention, not quality.
- Free tier: Mem0: 10,000 add requests and 1,000 retrieval requests per month. LangChain: Free to self-host.
- Plans and prices differ and are not like-for-like (credits, seats and usage limits vary), so we do not name a cheaper tool. The Paid plans row above quotes each vendor's plan list as read on Oct 25, 2026.

## Which should you pick?

- Pick Mem0 if: apps that need long-term per-user memory. Skip it if: you only need a vector database.
- Pick LangChain if: developers who want the widest set of integrations; teams that will pair it with LangGraph for stateful agents. Skip it if: you want a minimal library with few abstractions.

## Strengths and limits

Table: Strengths and limits as listed on each tool page

|  | Mem0 | LangChain |
|---|---|---|
| Strengths | Published quotas; Open-source option | Very large integration surface; MIT license |
| Limits | Add and retrieval quotas are separate | Large API surface; abstractions have changed over time; Our test was one small task on a local 3B model; it does not show behaviour with hosted models or larger jobs |

## What we did not verify

- Mem0: Benchmark claims (vendor).
- Output quality, speed and reliability beyond the smoke tests listed under What we measured: not compared.

## FAQ

### Is Mem0 or LangChain open source?

Mem0: Apache-2.0. LangChain: MIT. Licenses come from each project's GitHub repository or the vendor's own pages, read Oct 25, 2026; read the license text itself before redistributing or building a competing service.

### Does Mem0 or LangChain have a free plan?

Mem0: Free: 10,000 add requests and 1,000 retrieval requests per month. LangChain: Free: to self-host. Checked Oct 25, 2026; prices and limits change, so confirm on each vendor's page.

### Which was updated more recently, Mem0 or LangChain?

Mem0's newest release we saw is Python SDK v2.2.1 (Sep 25, 2026); LangChain's is langchain-core 1.7.0 (Oct 22, 2026). Read Oct 25, 2026 from the official release page or repository; a newer date is not a quality ranking.

### What is the main difference between Mem0 and LangChain?

Pricing model: Mem0 is "Freemium"; LangChain is "Free and open source". License: Mem0 is Apache-2.0; LangChain is MIT.

## Sources

- [Mem0](https://mem0.ai/) (fetched 2026-10-25)
- [Mem0 pricing](https://mem0.ai/pricing) (fetched 2026-10-25)
- [Mem0 repository (GitHub)](https://github.com/mem0ai/mem0) (fetched 2026-10-25)
- [LangChain](https://www.langchain.com/) (fetched 2026-10-25)
- [LangChain repository (GitHub)](https://github.com/langchain-ai/langchain) (fetched 2026-10-25)

## Related

- [Mem0 facts and sources](https://theagenticweekly.com/tools/mem0)
- [LangChain facts and sources](https://theagenticweekly.com/tools/langchain)
- [Alternatives to LangChain](https://theagenticweekly.com/alternatives/langchain)
- [Agent building: all tools we track](https://theagenticweekly.com/best/agent-building)
- [Letta vs Mem0](https://theagenticweekly.com/compare/letta-vs-mem0)
- [LangChain vs LlamaIndex](https://theagenticweekly.com/compare/langchain-vs-llamaindex)
- [LangChain vs Haystack](https://theagenticweekly.com/compare/langchain-vs-haystack)
- [Pydantic AI vs LangChain](https://theagenticweekly.com/compare/pydantic-ai-vs-langchain)
- [LangChain vs Vercel AI SDK](https://theagenticweekly.com/compare/langchain-vs-vercel-ai-sdk)
- [Semantic Kernel vs LangChain](https://theagenticweekly.com/compare/semantic-kernel-vs-langchain)

## Changelog

- 2026-10-25: First published. Facts read from vendor pages and the GitHub API on 2026-10-25.

## How to cite

Agentic Weekly, "Mem0 vs LangChain: license, pricing and features compared (October 2026)", last updated 2026-10-26, https://theagenticweekly.com/compare/mem0-vs-langchain