Open source focus
Postman is open source
Open Source Alternatives to Postman
60 open source API Development options similar to Postman, 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.
WireMock54Enterprise$6.5MOpen source · Self-hostable
Lunar.dev53EnterpriseTel Aviv, Israel$6.0MOpen source
Insomnia54API ManagementSan Francisco, United States$75.0MOpen source
Stoplight50API PlatformAustin, United States$21.6MOpen source
Testkube39MLOpsTel Aviv, Israel$12.0MOpen source · Self-hostable
API Platform16API PlatformParis, FranceOpen source · Self-hostable
Twill46Agentic AISan Francisco, United StatesOpen source · Self-hostable
Sharkio18EnterpriseOpen source
TestMu AI (Formerly LambdaTest)77MLOpsSan Francisco, United States$121Open source
Temporal71Workflow AutomationSeattle, United States$134.0MOpen source
Baseten57MLOpsSan Francisco, United States$2.3BOpen source
KiloClaw54Artificial IntelligenceOpen source · Self-hostable
Lambdatest India Private Limited53MLOpsSan Francisco, United StatesOpen source
Inngest Inc.48Developer ToolsSan Francisco, United States$5.0MOpen source
Swagger24API DevelopmentSomerville, United StatesOpen source · Self-hostable
Bayouops4Cloud InfrastructureHouston, United StatesOpen source
Neon72DatabaseSan Francisco, United States$1.2BOpen source
Tecton, Inc.67MLOpsSan Francisco, United States$257.0MOpen source
ABLY63Realtime CommunicationLondon, United Kingdom$88.0MOpen source
Komodor61Software DevelopmentTel Aviv, Israel$67.0MOpen source
Sourcegraph61Developer ToolsSan Francisco, United States$218.0MOpen source
Appwrite61EnterpriseSan Francisco, United States$37.0MOpen source · Self-hostable
Spacelift61Infrastructure as CodeWarsaw, Poland$73.6MOpen source
Dash058ObservabilitySan Francisco, United States$147.2MOpen source
FriendliAI57AI InfrastructureRedwood City, United States$89.0MOpen source
Diffblue55AI Coding AssistantOxford, United KingdomOpen source
Paperspace55AI InfrastructureNew York, United States$166.5MOpen source
LightningAI55AI InfrastructureSan Francisco, United StatesOpen source
Checksum55Test AutomationSan Francisco, United StatesOpen source
Robusta Dev55DevelopmentTel Aviv, IsraelOpen source · Self-hostable
OpenMeter54MLOpsTel Aviv, Israel$3.0MOpen source · Self-hostable
BreezoMeter54Weather$42.9MOpen source
- HYHyphen AI54AI InfrastructureSeattle, United States$36.5M
Open source
MosaicML (now Databricks)54Foundation ModelSan Francisco, United States$3.0BOpen source
Runhouse52EnterpriseSan Francisco, United States$4.9MOpen source
Estuary51Data StreamingSan Francisco, United States$28.0MOpen source
D-Wave51Quantum ComputingBurnaby, CanadaOpen source
Runpod49AI InfrastructureNew York, United StatesOpen source
Bitloops45Developer ToolsAthens, Greece$1.5MOpen source
Amplication44EnterpriseTel Aviv, IsraelOpen source · Self-hostable
Kiro IDE44Artificial IntelligenceSan Francisco, United StatesOpen source
Orq.ai41Agentic AIAmsterdam, Netherlands$8.9MOpen source
Responsive40EnterpriseSan Francisco, United StatesOpen source · Self-hostable
Hindcloud35AI InfrastructureSan Francisco, United States$1.0MOpen source
Firebase33Mobile DevelopmentSan Francisco, United States$5.0MOpen source
QUBRID30Cloud InfrastructureOpen source
Lawrence27Developer ToolsOpen source
Gemini CLI27AI Tools & AppsOpen source · Self-hostable
Node.js26Software DevelopmentOpen source · Self-hostable
Apigee25API PlatformSan Jose, United States$196.5MOpen source
Joeyydevops19MLOpsOpen source
Apache Airflow19MLOpsOpen source · Self-hostable
Camunda Pte. Limited18Workflow AutomationBerlin, GermanyOpen source · Self-hostable
Hycos AI15EnterpriseOpen source
Browserless12Web AutomationCamden, United StatesOpen source
Google Cloud AI Platform11MLOpsMountain View, United StatesOpen source
Gravitee4CybersecurityLondon, United KingdomOpen source
TorchctsMLOpsOpen source
- GetocOpen Source
Open source · Self-hostable
TrustyGorillaFeature FlaggingOpen source
| Company | Sector | License | HQ | Funding | Score | Website |
|---|---|---|---|---|---|---|
| WireMock | Enterprise | Open source · Self-hostable | — | $6.5M | 54 | |
| Lunar.dev | Enterprise | Open source | Tel Aviv, Israel | $6.0M | 53 | |
| Insomnia | API Management | Open source | San Francisco, United States | $75.0M | 54 | |
| Stoplight | API Platform | Open source | Austin, United States | $21.6M | 50 | |
| Testkube | MLOps | Open source · Self-hostable | Tel Aviv, Israel | $12.0M | 39 | |
| API Platform | API Platform | Open source · Self-hostable | Paris, France | — | 16 | |
| Twill | Agentic AI | Open source · Self-hostable | San Francisco, United States | — | 46 | |
| Sharkio | Enterprise | Open source | — | — | 18 | |
| TestMu AI (Formerly LambdaTest) | MLOps | Open source | San Francisco, United States | $121 | 77 | |
| Temporal | Workflow Automation | Open source | Seattle, United States | $134.0M | 71 | |
| Baseten | MLOps | Open source | San Francisco, United States | $2.3B | 57 | |
| KiloClaw | Artificial Intelligence | Open source · Self-hostable | — | — | 54 | |
| Lambdatest India Private Limited | MLOps | Open source | San Francisco, United States | — | 53 | |
| Inngest Inc. | Developer Tools | Open source | San Francisco, United States | $5.0M | 48 | |
| Swagger | API Development | Open source · Self-hostable | Somerville, United States | — | 24 | |
| Bayouops | Cloud Infrastructure | Open source | Houston, United States | — | 4 | |
| Neon | Database | Open source | San Francisco, United States | $1.2B | 72 | |
| Tecton, Inc. | MLOps | Open source | San Francisco, United States | $257.0M | 67 | |
| ABLY | Realtime Communication | Open source | London, United Kingdom | $88.0M | 63 | |
| Komodor | Software Development | Open source | Tel Aviv, Israel | $67.0M | 61 | |
| Sourcegraph | Developer Tools | Open source | San Francisco, United States | $218.0M | 61 | |
| Appwrite | Enterprise | Open source · Self-hostable | San Francisco, United States | $37.0M | 61 | |
| Spacelift | Infrastructure as Code | Open source | Warsaw, Poland | $73.6M | 61 | |
| Dash0 | Observability | Open source | San Francisco, United States | $147.2M | 58 | |
| FriendliAI | AI Infrastructure | Open source | Redwood City, United States | $89.0M | 57 | |
| Diffblue | AI Coding Assistant | Open source | Oxford, United Kingdom | — | 55 | |
| Paperspace | AI Infrastructure | Open source | New York, United States | $166.5M | 55 | |
| LightningAI | AI Infrastructure | Open source | San Francisco, United States | — | 55 | |
| Checksum | Test Automation | Open source | San Francisco, United States | — | 55 | |
| Robusta Dev | Development | Open source · Self-hostable | Tel Aviv, Israel | — | 55 | |
| OpenMeter | MLOps | Open source · Self-hostable | Tel Aviv, Israel | $3.0M | 54 | |
| BreezoMeter | Weather | Open source | — | $42.9M | 54 | |
| HYHyphen AI | AI Infrastructure | Open source | Seattle, United States | $36.5M | 54 | |
| MosaicML (now Databricks) | Foundation Model | Open source | San Francisco, United States | $3.0B | 54 | |
| Runhouse | Enterprise | Open source | San Francisco, United States | $4.9M | 52 | |
| Estuary | Data Streaming | Open source | San Francisco, United States | $28.0M | 51 | |
| D-Wave | Quantum Computing | Open source | Burnaby, Canada | — | 51 | |
| Runpod | AI Infrastructure | Open source | New York, United States | — | 49 | |
| Bitloops | Developer Tools | Open source | Athens, Greece | $1.5M | 45 | |
| Amplication | Enterprise | Open source · Self-hostable | Tel Aviv, Israel | — | 44 | |
| Kiro IDE | Artificial Intelligence | Open source | San Francisco, United States | — | 44 | |
| Orq.ai | Agentic AI | Open source | Amsterdam, Netherlands | $8.9M | 41 | |
| Responsive | Enterprise | Open source · Self-hostable | San Francisco, United States | — | 40 | |
| Hindcloud | AI Infrastructure | Open source | San Francisco, United States | $1.0M | 35 | |
| Firebase | Mobile Development | Open source | San Francisco, United States | $5.0M | 33 | |
| QUBRID | Cloud Infrastructure | Open source | — | — | 30 | |
| Lawrence | Developer Tools | Open source | — | — | 27 | |
| Gemini CLI | AI Tools & Apps | Open source · Self-hostable | — | — | 27 | |
| Node.js | Software Development | Open source · Self-hostable | — | — | 26 | |
| Apigee | API Platform | Open source | San Jose, United States | $196.5M | 25 | |
| Joeyydevops | MLOps | Open source | — | — | 19 | |
| Apache Airflow | MLOps | Open source · Self-hostable | — | — | 19 | |
| Camunda Pte. Limited | Workflow Automation | Open source · Self-hostable | Berlin, Germany | — | 18 | |
| Hycos AI | Enterprise | Open source | — | — | 15 | |
| Browserless | Web Automation | Open source | Camden, United States | — | 12 | |
| Google Cloud AI Platform | MLOps | Open source | Mountain View, United States | — | 11 | |
| Gravitee | Cybersecurity | Open source | London, United Kingdom | — | 4 | |
| Torchcts | MLOps | Open source | — | — | — | |
| Open Source | Open source · Self-hostable | — | — | — | ||
| TrustyGorilla | Feature Flagging | Open source | — | — | — |