Open source focus
Resend is open source
Open Source Alternatives to Resend
60 open source Developer Tools options similar to Resend, 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.
- MAMailgun58SaaSSan Antonio, United States$50.0M
Open source
OneSignal61Customer Engagement PlatformSan Mateo, United States$57.0MOpen source
Dub48MarTechSan Francisco, United States$17.0MOpen source
Dydas33Agentic AITel Aviv, IsraelOpen source
Gizzmo27MediaOpen source
Contentful10Content Management SystemBerlin, GermanyOpen source
Auto InflateGenerative AIOpen source
ImpulsiaConversational AIOpen source
LozaraAgentic AITel Aviv, IsraelOpen source
FounderKitSaaS ToolkitSan Francisco, United StatesOpen source
CultivateaiSales AutomationOpen source
GetcutGenerative AIOpen source
GeminatorGenerative AIOpen source
GhoztAgentic AIOpen source
OpenAI84Artificial IntelligenceSan Francisco, United States$493.9BOpen source
Polygon81BlockchainMumbai, India$400.0MOpen source
Cursor80Artificial IntelligenceSan Francisco, United States$2.9BOpen source
Postman78API DevelopmentSan Francisco, United StatesOpen source
TestMu AI (Formerly LambdaTest)77MLOpsSan Francisco, United States$121Open source
Together AI76AI InfrastructureSan Francisco, United States$906.0MOpen source · Self-hostable
Algolia75Search TechnologySan Francisco, United States$334.2MOpen source
Tailscale74CybersecuritySan Francisco, United States$505.0MOpen source
Neon72DatabaseSan Francisco, United States$1.2BOpen source
Stripe, Inc.72BillingSouth San Francisco, United States$11.4BOpen source
Osaurus71Artificial IntelligenceSan Francisco, USA$63.0MOpen source
Temporal71Workflow AutomationSeattle, United States$134.0MOpen source
WorkOS71Developer ToolsSan Francisco, United States$198.0MOpen source
Qdrant70Vector DatabaseBerlin, Germany$96.5MOpen source · Self-hostable
Vercel70Web DevelopmentSan Francisco, United States$687.5MOpen source
OpenRouter70InfrastructureSan Francisco, United States$153.5MOpen source
Hightouch70Customer Data PlatformSan Francisco, United States$322.0MOpen source
- Supabase70DatabaseSan Francisco, United States$933.0M
Open source · Self-hostable
Netlify69Cloud ComputingSan Francisco, United States$202.1MOpen source
Pinecone69AI InfrastructureSan Francisco, United States$138.0MOpen source
Tecton, Inc.67MLOpsSan Francisco, United States$257.0MOpen source
Alpaca67FintechNew York, United States$202.0MOpen source
YugabyteDB67DatabaseSunnyvale, United States$266.0MOpen source · Self-hostable
Sourcegraph (Cody)66AI Coding AssistantSan Francisco, United States$301.0MOpen source
Daytona66AI InfrastructureNew York, United States$46.0MOpen source
Dust65Agentic AIParis, France$15.0MOpen source
npm65Developer ToolsOakland, USA$10.6MOpen source · Self-hostable
Firecrawl65Agentic AISan Francisco, United States$29.0MOpen source
Arize AI65AI ObservabilityBerkeley, United StatesOpen source
cubic65Supply ChainTel Aviv, IsraelOpen source
CopilotKit64Agentic AISan Francisco, United States$42.0MOpen source
Qodo64AI Coding AssistantTel Aviv, Israel$1.5MOpen source
ABLY63Realtime CommunicationLondon, United Kingdom$88.0MOpen source
Airweave63Agentic AISan Francisco, United States$6.0MOpen source · Self-hostable
Trigger Device Inc63AI AgentsLondon, United Kingdom$16.5MOpen source · Self-hostable
Weights & Biases (W&B)63MLOpsSan Francisco, United States$521.0MOpen source
Monad Labs62BlockchainNew York, United States$266.0MOpen source
Comet ML62MLOpsNew York, United States$69.8MOpen source
RadixArk62Artificial IntelligencePalo Alto, USA$20.0MOpen source
LiteLLM62Foundation ModelSan Francisco, United StatesOpen source · Self-hostable
Entire62Artificial Intelligence$60.0MOpen source · Self-hostable
Orkes62Artificial IntelligenceSanta Clara, USA$89.3MOpen source
Appwrite61EnterpriseSan Francisco, United States$37.0MOpen source · Self-hostable
Stytch61AuthenticationSan Francisco, USA$127.0MOpen source
fal AI61Generative AISan Francisco, United States$20.0MOpen source
Komodor61Software DevelopmentTel Aviv, Israel$67.0MOpen source
| Company | Sector | License | HQ | Funding | Score | Website |
|---|---|---|---|---|---|---|
| MAMailgun | SaaS | Open source | San Antonio, United States | $50.0M | 58 | |
| OneSignal | Customer Engagement Platform | Open source | San Mateo, United States | $57.0M | 61 | |
| Dub | MarTech | Open source | San Francisco, United States | $17.0M | 48 | |
| Dydas | Agentic AI | Open source | Tel Aviv, Israel | — | 33 | |
| Gizzmo | Media | Open source | — | — | 27 | |
| Contentful | Content Management System | Open source | Berlin, Germany | — | 10 | |
| Auto Inflate | Generative AI | Open source | — | — | — | |
| Impulsia | Conversational AI | Open source | — | — | — | |
| Lozara | Agentic AI | Open source | Tel Aviv, Israel | — | — | |
| FounderKit | SaaS Toolkit | Open source | San Francisco, United States | — | — | |
| Cultivateai | Sales Automation | Open source | — | — | — | |
| Getcut | Generative AI | Open source | — | — | — | |
| Geminator | Generative AI | Open source | — | — | — | |
| Ghozt | Agentic AI | Open source | — | — | — | |
| OpenAI | Artificial Intelligence | Open source | San Francisco, United States | $493.9B | 84 | |
| Polygon | Blockchain | Open source | Mumbai, India | $400.0M | 81 | |
| Cursor | Artificial Intelligence | Open source | San Francisco, United States | $2.9B | 80 | |
| Postman | API Development | Open source | San Francisco, United States | — | 78 | |
| TestMu AI (Formerly LambdaTest) | MLOps | Open source | San Francisco, United States | $121 | 77 | |
| Together AI | AI Infrastructure | Open source · Self-hostable | San Francisco, United States | $906.0M | 76 | |
| Algolia | Search Technology | Open source | San Francisco, United States | $334.2M | 75 | |
| Tailscale | Cybersecurity | Open source | San Francisco, United States | $505.0M | 74 | |
| Neon | Database | Open source | San Francisco, United States | $1.2B | 72 | |
| Stripe, Inc. | Billing | Open source | South San Francisco, United States | $11.4B | 72 | |
| Osaurus | Artificial Intelligence | Open source | San Francisco, USA | $63.0M | 71 | |
| Temporal | Workflow Automation | Open source | Seattle, United States | $134.0M | 71 | |
| WorkOS | Developer Tools | Open source | San Francisco, United States | $198.0M | 71 | |
| Qdrant | Vector Database | Open source · Self-hostable | Berlin, Germany | $96.5M | 70 | |
| Vercel | Web Development | Open source | San Francisco, United States | $687.5M | 70 | |
| OpenRouter | Infrastructure | Open source | San Francisco, United States | $153.5M | 70 | |
| Hightouch | Customer Data Platform | Open source | San Francisco, United States | $322.0M | 70 | |
| Database | Open source · Self-hostable | San Francisco, United States | $933.0M | 70 | ||
| Netlify | Cloud Computing | Open source | San Francisco, United States | $202.1M | 69 | |
| Pinecone | AI Infrastructure | Open source | San Francisco, United States | $138.0M | 69 | |
| Tecton, Inc. | MLOps | Open source | San Francisco, United States | $257.0M | 67 | |
| Alpaca | Fintech | Open source | New York, United States | $202.0M | 67 | |
| YugabyteDB | Database | Open source · Self-hostable | Sunnyvale, United States | $266.0M | 67 | |
| Sourcegraph (Cody) | AI Coding Assistant | Open source | San Francisco, United States | $301.0M | 66 | |
| Daytona | AI Infrastructure | Open source | New York, United States | $46.0M | 66 | |
| Dust | Agentic AI | Open source | Paris, France | $15.0M | 65 | |
| npm | Developer Tools | Open source · Self-hostable | Oakland, USA | $10.6M | 65 | |
| Firecrawl | Agentic AI | Open source | San Francisco, United States | $29.0M | 65 | |
| Arize AI | AI Observability | Open source | Berkeley, United States | — | 65 | |
| cubic | Supply Chain | Open source | Tel Aviv, Israel | — | 65 | |
| CopilotKit | Agentic AI | Open source | San Francisco, United States | $42.0M | 64 | |
| Qodo | AI Coding Assistant | Open source | Tel Aviv, Israel | $1.5M | 64 | |
| ABLY | Realtime Communication | Open source | London, United Kingdom | $88.0M | 63 | |
| Airweave | Agentic AI | Open source · Self-hostable | San Francisco, United States | $6.0M | 63 | |
| Trigger Device Inc | AI Agents | Open source · Self-hostable | London, United Kingdom | $16.5M | 63 | |
| Weights & Biases (W&B) | MLOps | Open source | San Francisco, United States | $521.0M | 63 | |
| Monad Labs | Blockchain | Open source | New York, United States | $266.0M | 62 | |
| Comet ML | MLOps | Open source | New York, United States | $69.8M | 62 | |
| RadixArk | Artificial Intelligence | Open source | Palo Alto, USA | $20.0M | 62 | |
| LiteLLM | Foundation Model | Open source · Self-hostable | San Francisco, United States | — | 62 | |
| Entire | Artificial Intelligence | Open source · Self-hostable | — | $60.0M | 62 | |
| Orkes | Artificial Intelligence | Open source | Santa Clara, USA | $89.3M | 62 | |
| Appwrite | Enterprise | Open source · Self-hostable | San Francisco, United States | $37.0M | 61 | |
| Stytch | Authentication | Open source | San Francisco, USA | $127.0M | 61 | |
| fal AI | Generative AI | Open source | San Francisco, United States | $20.0M | 61 | |
| Komodor | Software Development | Open source | Tel Aviv, Israel | $67.0M | 61 |