Open source focus
Open Source Alternatives to Castia
60 open source AI Outbound Operating Platform options similar to Castia, 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.
MyamelieAgentic AITel Aviv, IsraelOpen source
B2upAgentic AITel Aviv, IsraelOpen source
Dante45Artificial Intelligence$1.5MOpen source
Lionwire17Voice AIOpen source
AskhorizonConversational AILondon, United KingdomOpen source
CowpokeAI AgentOpen source
TradetribeAgentic AITel Aviv, IsraelOpen source
SarhanConversational AITel Aviv, IsraelOpen source
FlintgptConversational AIOpen source
RevulaConversational AITel Aviv, IsraelOpen source
KotokuConversational AITel Aviv, IsraelOpen source
RonivaConversational AITel Aviv, IsraelOpen source
RevanipulseAgentic AIOpen source
MoriwaConversational AIOpen source
KlyvioAI Search EngineTel Aviv, IsraelOpen source
Instant365Conversational AITel Aviv, IsraelOpen source
OpenAI84Artificial IntelligenceSan Francisco, United States$493.9BOpen source
DeepL82Artificial IntelligenceCologne, Germany$300.0MOpen source
Bloomberg L.P.82FintechNew York, United States$60.1BOpen source
- XAxAI78Frontier AI LabPalo Alto, United States$90.0B
Open source
Together AI76AI InfrastructureSan Francisco, United States$906.0MOpen source · Self-hostable
Lovable75No-Code/Low-CodeStockholm, Sweden$1.2BOpen source
Perplexity AI71Search EngineSan Francisco, United States$591.4MOpen source
Arena71Artificial IntelligenceBerkeley, USA$250.0MOpen source
DeepSeek AI70AI InfrastructureBeijing, ChinaOpen source
OpenRouter70InfrastructureSan Francisco, United States$153.5MOpen source
Pinecone69AI InfrastructureSan Francisco, United States$138.0MOpen source
Lacentral68Frontier AI LabSan Francisco, United States$11.3BOpen source
Stability AI68Generative AILondon, United Kingdom$101.0MOpen source · Self-hostable
- MOMoonshot AI66Frontier AI LabBeijing, China$250.0M
Open source
Dust65Agentic AIParis, France$15.0MOpen source
z.ai65Foundation ModelSan Francisco, USA$1.3BOpen source
H2O.ai64Foundation ModelMountain View, United States$228.1MOpen source · Self-hostable
Sarvam AI63Agentic AIBengaluru, India$234.0MOpen source
Lakera AI AG63AI SecurityBerlin, Germany$12.0MOpen source
Cognigy (NICE)63Voice AgentDüsseldorf, GermanyOpen source
LiteLLM62Foundation ModelSan Francisco, United StatesOpen source · Self-hostable
Viktor62Artificial IntelligenceWarsaw, Poland$64.7MOpen source
Sendbird61Conversational AISan Mateo, United StatesOpen source
LangChain61Agentic AISan Francisco, United States$260.0MOpen source
Vectara60Agentic AIPalo Alto, United States$40.0MOpen source
Composio59Agentic AISan Francisco, United States$50.0MOpen source
Modular58AI InfrastructureSan Francisco, United States$380.0MOpen source
- MIMintlify / mcpt57Developer ToolsSan Francisco, United States
Open source
Chai56AI ChatbotSan Francisco, United States$62.0MOpen source
- CLClerk56Developer ToolsSan Francisco, United States$69.0M
Open source
CHAI: AI Platform56AI InfrastructurePalo Alto, United States$3.7MOpen source
Converge Bio56Life SciencesSan Francisco, United States$5.5MOpen source · Self-hostable
Auto-GPT56Agentic AI$12.0MOpen source · Self-hostable
LightningAI55AI InfrastructureSan Francisco, United StatesOpen source
Traceloop55LLMOpsTel Aviv, Israel$6.1MOpen source
pleias55AI InfrastructureParis, FranceOpen source
M Magical54Artificial IntelligenceSan Francisco, United StatesOpen source
Bito54AI Coding AssistantSan Francisco, United States$5.7MOpen source
- HYHyphen AI54AI InfrastructureSeattle, United States$36.5M
Open source
giniX54Generative AITel Aviv, IsraelOpen source
Feast AI54MLOpsSan Francisco, United StatesOpen source · Self-hostable
MosaicML (now Databricks)54Foundation ModelSan Francisco, United States$21.7MOpen source
Knostic54Cybersecurity$14.3MOpen source
Relevance AI53Agentic AITel Aviv, Israel$12.0MOpen source
| Company | Sector | License | HQ | Funding | Score |
|---|---|---|---|---|---|
| Myamelie | Agentic AI | Open source | Tel Aviv, Israel | — | — |
| B2up | Agentic AI | Open source | Tel Aviv, Israel | — | — |
| Dante | Artificial Intelligence | Open source | — | $1.5M | 45 |
| Lionwire | Voice AI | Open source | — | — | 17 |
| Askhorizon | Conversational AI | Open source | London, United Kingdom | — | — |
| Cowpoke | AI Agent | Open source | — | — | — |
| Tradetribe | Agentic AI | Open source | Tel Aviv, Israel | — | — |
| Sarhan | Conversational AI | Open source | Tel Aviv, Israel | — | — |
| Flintgpt | Conversational AI | Open source | — | — | — |
| Revula | Conversational AI | Open source | Tel Aviv, Israel | — | — |
| Kotoku | Conversational AI | Open source | Tel Aviv, Israel | — | — |
| Roniva | Conversational AI | Open source | Tel Aviv, Israel | — | — |
| Revanipulse | Agentic AI | Open source | — | — | — |
| Moriwa | Conversational AI | Open source | — | — | — |
| Klyvio | AI Search Engine | Open source | Tel Aviv, Israel | — | — |
| Instant365 | Conversational AI | Open source | Tel Aviv, Israel | — | — |
| OpenAI | Artificial Intelligence | Open source | San Francisco, United States | $493.9B | 84 |
| DeepL | Artificial Intelligence | Open source | Cologne, Germany | $300.0M | 82 |
| Bloomberg L.P. | Fintech | Open source | New York, United States | $60.1B | 82 |
| XAxAI | Frontier AI Lab | Open source | Palo Alto, United States | $90.0B | 78 |
| Together AI | AI Infrastructure | Open source · Self-hostable | San Francisco, United States | $906.0M | 76 |
| Lovable | No-Code/Low-Code | Open source | Stockholm, Sweden | $1.2B | 75 |
| Perplexity AI | Search Engine | Open source | San Francisco, United States | $591.4M | 71 |
| Arena | Artificial Intelligence | Open source | Berkeley, USA | $250.0M | 71 |
| DeepSeek AI | AI Infrastructure | Open source | Beijing, China | — | 70 |
| OpenRouter | Infrastructure | Open source | San Francisco, United States | $153.5M | 70 |
| Pinecone | AI Infrastructure | Open source | San Francisco, United States | $138.0M | 69 |
| Lacentral | Frontier AI Lab | Open source | San Francisco, United States | $11.3B | 68 |
| Stability AI | Generative AI | Open source · Self-hostable | London, United Kingdom | $101.0M | 68 |
| MOMoonshot AI | Frontier AI Lab | Open source | Beijing, China | $250.0M | 66 |
| Dust | Agentic AI | Open source | Paris, France | $15.0M | 65 |
| z.ai | Foundation Model | Open source | San Francisco, USA | $1.3B | 65 |
| H2O.ai | Foundation Model | Open source · Self-hostable | Mountain View, United States | $228.1M | 64 |
| Sarvam AI | Agentic AI | Open source | Bengaluru, India | $234.0M | 63 |
| Lakera AI AG | AI Security | Open source | Berlin, Germany | $12.0M | 63 |
| Cognigy (NICE) | Voice Agent | Open source | Düsseldorf, Germany | — | 63 |
| LiteLLM | Foundation Model | Open source · Self-hostable | San Francisco, United States | — | 62 |
| Viktor | Artificial Intelligence | Open source | Warsaw, Poland | $64.7M | 62 |
| Sendbird | Conversational AI | Open source | San Mateo, United States | — | 61 |
| LangChain | Agentic AI | Open source | San Francisco, United States | $260.0M | 61 |
| Vectara | Agentic AI | Open source | Palo Alto, United States | $40.0M | 60 |
| Composio | Agentic AI | Open source | San Francisco, United States | $50.0M | 59 |
| Modular | AI Infrastructure | Open source | San Francisco, United States | $380.0M | 58 |
| MIMintlify / mcpt | Developer Tools | Open source | San Francisco, United States | — | 57 |
| Chai | AI Chatbot | Open source | San Francisco, United States | $62.0M | 56 |
| CLClerk | Developer Tools | Open source | San Francisco, United States | $69.0M | 56 |
| CHAI: AI Platform | AI Infrastructure | Open source | Palo Alto, United States | $3.7M | 56 |
| Converge Bio | Life Sciences | Open source · Self-hostable | San Francisco, United States | $5.5M | 56 |
| Auto-GPT | Agentic AI | Open source · Self-hostable | — | $12.0M | 56 |
| LightningAI | AI Infrastructure | Open source | San Francisco, United States | — | 55 |
| Traceloop | LLMOps | Open source | Tel Aviv, Israel | $6.1M | 55 |
| pleias | AI Infrastructure | Open source | Paris, France | — | 55 |
| M Magical | Artificial Intelligence | Open source | San Francisco, United States | — | 54 |
| Bito | AI Coding Assistant | Open source | San Francisco, United States | $5.7M | 54 |
| HYHyphen AI | AI Infrastructure | Open source | Seattle, United States | $36.5M | 54 |
| giniX | Generative AI | Open source | Tel Aviv, Israel | — | 54 |
| Feast AI | MLOps | Open source · Self-hostable | San Francisco, United States | — | 54 |
| MosaicML (now Databricks) | Foundation Model | Open source | San Francisco, United States | $21.7M | 54 |
| Knostic | Cybersecurity | Open source | — | $14.3M | 54 |
| Relevance AI | Agentic AI | Open source | Tel Aviv, Israel | $12.0M | 53 |