Letta vs LlamaIndex
Letta vs LlamaIndex, compared side by side on 15 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: Letta is on 35/100 and LlamaIndex on 33/100.
Where each one leads
Letta
- our overall score: 35/100 against 33/100
- agent readiness: 49/100 against 43/100
LlamaIndex
- domain rating: 81/100 against 72/100
- headcount: 78 against 15
- LinkedIn following: 259,243 against 5,596
At a glance
| Measure | Letta | LlamaIndex |
|---|---|---|
| What it is | An operating system for building stateful AI agents, managing context, memory, and resource allocation. | LlamaIndex empowers developers to build agents that extract insights and take action on complex enterprise documents, combining industry-leading parsing with a trusted agent framework. |
| Category | Agentic AI, AI Agent, Foundation Model, Operating System | Agentic AI, LLM Framework, AI Development Frameworks, Customer Service |
| Sells toBusiness model | B2B | Not published |
| Offering | Software | Not published |
| Founded | 2023 | Not published |
| Headquarters | San Francisco, United States | United States |
| Status | Active | Active |
Size, funding and growth
| Measure | Letta | LlamaIndex |
|---|---|---|
| Employees | 15 | 78 |
| LinkedIn followers | 5,596 | 259,243 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Letta | LlamaIndex |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 35/100 | 33/100 |
| Traction | 12/100 | 19/100 |
| Team | 60/100 | 50/100 |
| Community | Not published | 8/100 |
| Search visibility | 32/100 | 35/100 |
| Agent readinessHow well an AI agent can read and act on the site | D (49/100) | D (43/100) |
| Domain ratingLink authority, 0-100 | 72/100 | 81/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Letta | LlamaIndex |
|---|---|---|
| Hosting | Not detected | Vercel |
| CDN | Cloudflare | Vercel |
| Analytics | Plausible | Not detected |
| Open source | Yes | Yes |
Product and pricing
| Measure | Letta | LlamaIndex |
|---|---|---|
| Key features | Stateful Agent OS, Advanced Context & Memory Management, Tool Rules for Reliability, Agents-as-a-Service Deployment, Agent Development Environment, Custom Tool Integration | Document Parsing, Data Extraction, Agent Framework, Knowledge Management, Multi-modal Indexing, Automated Schema Generation |
Letta vs LlamaIndex: common questions
Which is better, Letta or LlamaIndex?
On our 0-100 score Letta rates higher (35/100 against 33/100). 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 15 data points above: read the rows that match what you are buying for.
How do Letta and LlamaIndex compare on the numbers?
Letta leads on our overall score (35/100 against 33/100), agent readiness (49/100 against 43/100). LlamaIndex leads on domain rating (81/100 against 72/100), headcount (78 against 15), LinkedIn following (259,243 against 5,596).
Read the full Letta review and pricing or the LlamaIndex review and pricing. You can also browse other Letta alternatives we track.