Open source focus
Open Source Alternatives to Papertool
60 open source AI Search Engine options similar to Papertool, ranked by named competitors first, sector overlap, and our 0-100 AI-readiness score. Each profile notes license and self-hosting where we have it.
Elicit62Artificial IntelligenceOakland, United States$31.0MOpen source
Perplexity AI71Search EngineSan Francisco, United States$591.4MOpen source
Vectara60Agentic AIPalo Alto, United States$40.0MOpen source
Deepjudge Ai54LegalTechTel Aviv, Israel$53.4MOpen source
Chalk.ai48LegalTechSan Francisco, United StatesOpen source
Isacus46LegalTechTel Aviv, Israel$700KOpen source
Briefbridge36AI Search EngineTel Aviv, Israel$1.5MOpen source
Andraste32Agentic AISan Francisco, United StatesOpen source
MemGPT28Foundation ModelOpen source
GPT Researcher13Agentic AIOpen source
Langchain-Chatchat11Open SourceOpen source · Self-hostable
LlamaAi (DefiLlama)10FintechOpen source
- PRPrivateGPT5AI Search Engine
Open source · Self-hostable
42research4AI Search EngineTel Aviv, IsraelOpen source
TinyFish3Artificial IntelligenceSan Francisco, United StatesOpen source
ZenlawyerLegalTechTel Aviv, IsraelOpen source
KaliaiFoundation ModelSan Francisco, United StatesOpen source
CasezLegalTechTel Aviv, IsraelOpen source
PaperswanAI Search EngineSan Francisco, United StatesOpen source
PostintelligencecontractsLegalTechOpen source
VektorsearchpartnersAI Search EngineTel Aviv, IsraelOpen source
Pinecone69AI InfrastructureSan Francisco, United States$138.0MOpen source
Dust65Agentic AIParis, France$15.0MOpen source
z.ai65Foundation ModelSan Francisco, USA$1.3BOpen source
LiteLLM62Foundation ModelSan Francisco, United StatesOpen source · Self-hostable
Composio59Agentic AISan Francisco, United States$50.0MOpen source
Langfuse GmbH58MLOpsBerlin, Germany$2.5MOpen source
Tavily57Generative AITel Aviv, Israel$5.0MOpen source
Market Beyond57RetailTechNew York, United States$4.0MOpen source
Arcten55Agentic AISan Francisco, United StatesOpen source
Feast AI54MLOpsSan Francisco, United StatesOpen source · Self-hostable
Langfuse54MLOpsBerlin, Germany$2.5MOpen source
Bito54AI Coding AssistantSan Francisco, United States$5.7MOpen source
Plane53Project ManagementSan Francisco, United States$4.0MOpen source
Recall AI46Personal AISan Francisco, United States$10.3MOpen source
GitHits44Developer ToolsHelsinki, Finland$1.5MOpen source · Self-hostable
Haystack42AI Search EngineSan Francisco, United States$10.0MOpen source
- MIMind Lab41Artificial IntelligenceSan Francisco, United States
Open source
Letta36Agentic AISan Francisco, United StatesOpen source
Answers36AI Search EngineSan Francisco, United States$1.5BOpen source
Qualifire32Generative AIOpen source
Vibranium Dome23AI AgentsOpen source · Self-hostable
Fundamental Research Labs22Frontier AI LabSan Francisco, United States$10.0MOpen source
Langbase20Agentic AISan Francisco, United StatesOpen source
WebWright11API PlatformOpen source
- XMxMemory10Artificial IntelligenceLondon, United Kingdom
Open source
Consensus360AI Search EngineOpen source
TripvaletTravel TechTel Aviv, IsraelOpen source
AskjoynaAgentic AISan Francisco, United StatesOpen source
StudyboltEdTechTel Aviv, IsraelOpen source
LwaiGenerative AIOpen source
ClauderizerAI Coding AssistantOpen source
- LoireLegalTechSan Francisco, United States
Open source
- BetzalelAgentic AI
Open source
FastclaudeAI Search EngineOpen source
BiblelensAI Search EngineOpen source
Open and AsyncAgentic AISan Francisco, United StatesOpen source
DataforeveryoneAI Search EngineSan Francisco, United StatesOpen source
- EvolvinglabAgentic AI
Open source
- ThebabrainAI Search Engine
Open source
| Company | Sector | License | HQ | Funding | Score |
|---|---|---|---|---|---|
| Elicit | Artificial Intelligence | Open source | Oakland, United States | $31.0M | 62 |
| Perplexity AI | Search Engine | Open source | San Francisco, United States | $591.4M | 71 |
| Vectara | Agentic AI | Open source | Palo Alto, United States | $40.0M | 60 |
| Deepjudge Ai | LegalTech | Open source | Tel Aviv, Israel | $53.4M | 54 |
| Chalk.ai | LegalTech | Open source | San Francisco, United States | — | 48 |
| Isacus | LegalTech | Open source | Tel Aviv, Israel | $700K | 46 |
| Briefbridge | AI Search Engine | Open source | Tel Aviv, Israel | $1.5M | 36 |
| Andraste | Agentic AI | Open source | San Francisco, United States | — | 32 |
| MemGPT | Foundation Model | Open source | — | — | 28 |
| GPT Researcher | Agentic AI | Open source | — | — | 13 |
| Langchain-Chatchat | Open Source | Open source · Self-hostable | — | — | 11 |
| LlamaAi (DefiLlama) | Fintech | Open source | — | — | 10 |
| PRPrivateGPT | AI Search Engine | Open source · Self-hostable | — | — | 5 |
| 42research | AI Search Engine | Open source | Tel Aviv, Israel | — | 4 |
| TinyFish | Artificial Intelligence | Open source | San Francisco, United States | — | 3 |
| Zenlawyer | LegalTech | Open source | Tel Aviv, Israel | — | — |
| Kaliai | Foundation Model | Open source | San Francisco, United States | — | — |
| Casez | LegalTech | Open source | Tel Aviv, Israel | — | — |
| Paperswan | AI Search Engine | Open source | San Francisco, United States | — | — |
| Postintelligencecontracts | LegalTech | Open source | — | — | — |
| Vektorsearchpartners | AI Search Engine | Open source | Tel Aviv, Israel | — | — |
| Pinecone | AI Infrastructure | Open source | San Francisco, United States | $138.0M | 69 |
| Dust | Agentic AI | Open source | Paris, France | $15.0M | 65 |
| z.ai | Foundation Model | Open source | San Francisco, USA | $1.3B | 65 |
| LiteLLM | Foundation Model | Open source · Self-hostable | San Francisco, United States | — | 62 |
| Composio | Agentic AI | Open source | San Francisco, United States | $50.0M | 59 |
| Langfuse GmbH | MLOps | Open source | Berlin, Germany | $2.5M | 58 |
| Tavily | Generative AI | Open source | Tel Aviv, Israel | $5.0M | 57 |
| Market Beyond | RetailTech | Open source | New York, United States | $4.0M | 57 |
| Arcten | Agentic AI | Open source | San Francisco, United States | — | 55 |
| Feast AI | MLOps | Open source · Self-hostable | San Francisco, United States | — | 54 |
| Langfuse | MLOps | Open source | Berlin, Germany | $2.5M | 54 |
| Bito | AI Coding Assistant | Open source | San Francisco, United States | $5.7M | 54 |
| Plane | Project Management | Open source | San Francisco, United States | $4.0M | 53 |
| Recall AI | Personal AI | Open source | San Francisco, United States | $10.3M | 46 |
| GitHits | Developer Tools | Open source · Self-hostable | Helsinki, Finland | $1.5M | 44 |
| Haystack | AI Search Engine | Open source | San Francisco, United States | $10.0M | 42 |
| MIMind Lab | Artificial Intelligence | Open source | San Francisco, United States | — | 41 |
| Letta | Agentic AI | Open source | San Francisco, United States | — | 36 |
| Answers | AI Search Engine | Open source | San Francisco, United States | $1.5B | 36 |
| Qualifire | Generative AI | Open source | — | — | 32 |
| Vibranium Dome | AI Agents | Open source · Self-hostable | — | — | 23 |
| Fundamental Research Labs | Frontier AI Lab | Open source | San Francisco, United States | $10.0M | 22 |
| Langbase | Agentic AI | Open source | San Francisco, United States | — | 20 |
| WebWright | API Platform | Open source | — | — | 11 |
| XMxMemory | Artificial Intelligence | Open source | London, United Kingdom | — | 10 |
| Consensus360 | AI Search Engine | Open source | — | — | — |
| Tripvalet | Travel Tech | Open source | Tel Aviv, Israel | — | — |
| Askjoyna | Agentic AI | Open source | San Francisco, United States | — | — |
| Studybolt | EdTech | Open source | Tel Aviv, Israel | — | — |
| Lwai | Generative AI | Open source | — | — | — |
| Clauderizer | AI Coding Assistant | Open source | — | — | — |
| LegalTech | Open source | San Francisco, United States | — | — | |
| Agentic AI | Open source | — | — | — | |
| Fastclaude | AI Search Engine | Open source | — | — | — |
| Biblelens | AI Search Engine | Open source | — | — | — |
| Open and Async | Agentic AI | Open source | San Francisco, United States | — | — |
| Dataforeveryone | AI Search Engine | Open source | San Francisco, United States | — | — |
| Agentic AI | Open source | — | — | — | |
| AI Search Engine | Open source | — | — | — |