LangChain vs Letta
LangChain vs Letta, compared side by side on 18 data points: what each one does, how big it is, what it has raised, the tech running each site, and what users report. We score both out of 100 on traction, team and visibility: LangChain is on 76/100 and Letta on 35/100.
Where each one leads
LangChain
- our overall score: 76/100 against 35/100
- domain rating: 86/100 against 72/100
- headcount: 312 against 15
- LinkedIn following: 514,641 against 5,596
Letta
- agent readiness: 49/100 against 42/100
At a glance
| Measure | LangChain | Letta |
|---|---|---|
| What it is | The platform for building reliable AI agents and LLM applications. | An operating system for building stateful AI agents, managing context, memory, and resource allocation. |
| Category | Agentic AI, AI Agent, Foundation Model, Large Language Model | Agentic AI, AI Agent, Foundation Model, Operating System |
| Sells toBusiness model | B2B | B2B |
| Offering | Platform | Software |
| Founded | 2022 | 2023 |
| Headquarters | San Francisco, United States | San Francisco, United States |
| Status | Active | Active |
Size, funding and growth
| Measure | LangChain | Letta |
|---|---|---|
| Employees | 312 | 15 |
| Headcount growthLast 12 months | +260.4% | Not published |
| Total funding | $260M | Not published |
| Valuation | $1K | Not published |
| LinkedIn followers | 514,641 | 5,596 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | LangChain | Letta |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 76/100 | 35/100 |
| Traction | 60/100 | 12/100 |
| Team | 70/100 | 60/100 |
| Community | 20/100 | Not published |
| Search visibility | 84/100 | 32/100 |
| Quality | 83/100 | Not published |
| Agent readinessHow well an AI agent can read and act on the site | D (42/100) | D (49/100) |
| Domain ratingLink authority, 0-100 | 86/100 | 72/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | LangChain | Letta |
|---|---|---|
| CDN | Cloudflare | Cloudflare |
| CMS | Webflow | Not detected |
| Analytics | Google Tag Manager, Plausible | Plausible |
| Open source | Yes | Yes |
Product and pricing
| Measure | LangChain | Letta |
|---|---|---|
| Key features | Not published | Stateful Agent OS, Advanced Context & Memory Management, Tool Rules for Reliability, Agents-as-a-Service Deployment, Agent Development Environment, Custom Tool Integration |
LangChain vs Letta: common questions
Which is better, LangChain or Letta?
On our 0-100 score LangChain rates higher (76/100 against 35/100). The score weights traction, team, visibility and profile completeness, so it reflects company strength rather than which product suits you. We compare the two on 18 data points above: read the rows that match what you are buying for.
How do LangChain and Letta compare on the numbers?
LangChain leads on our overall score (76/100 against 35/100), domain rating (86/100 against 72/100), headcount (312 against 15), LinkedIn following (514,641 against 5,596). Letta leads on agent readiness (49/100 against 42/100).
Read the full LangChain review and pricing or the Letta review and pricing. You can also browse other LangChain alternatives we track.