# ASP.NET Core vs Fastify

| Attribute | ASP.NET Core | Fastify |
|---|---|---|
| **vioscaleAI score** | 71.2 (76% (high)) | 70 (78% (high)) |
| activity.commits_last_30d | - | 20 |
| adoption.dependent_repos | - | 16,712 |
| adoption.github_stars | - | 37,232 |
| content.faq | `[{"answer":"A framework for building web apps and services with .NET and C#. Includes Blazor for web UI development, REST APIs, real-time communication, and AI/ML capabilities. It is indexed under Web Frameworks.","source":"https://dotnet.microsoft.com/en-us/apps/aspnet","question":"What is ASP.NET Core?","confidence":0.6},{"answer":"ASP.NET Core is open source, so it can be self-hosted and used at no licence cost. Pricing changes often, so verify at source before relying on it.","source":"https://dotnet.microsoft.com/en-us/apps/aspnet","question":"Is ASP.NET Core free to use?","confidence":0.6},{"answer":"ASP.NET Core supports the web, Windows, macOS and Linux. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://dotnet.microsoft.com/en-us/apps/aspnet","question":"What platforms does ASP.NET Core support?","confidence":0.6},{"answer":"Yes. ASP.NET Core can be deployed cloud / SaaS, hybrid, on-premise and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://dotnet.microsoft.com/en-us/apps/aspnet","question":"Can ASP.NET Core be self-hosted?","confidence":0.6},{"answer":"We have confirmed 6 integrations for ASP.NET Core, including Google, X, OpenAI, Azure, Power Apps and Power Platform. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://dotnet.microsoft.com/en-us/apps/aspnet","question":"What does ASP.NET Core integrate with?","confidence":0.6}]` | `[{"answer":"A Node.js web framework optimized to handle high request volumes with minimal overhead, featuring a plugin system, JSON Schema validation, and native TypeScript support. It is indexed under Web Frameworks.","source":"https://fastify.dev","question":"What is Fastify?","confidence":0.6},{"answer":"Fastify is open source, so it can be self-hosted and used at no licence cost. It is released under the MIT licence. Pricing changes often, so verify at source before relying on it.","source":"https://fastify.dev","question":"Is Fastify free to use?","confidence":0.6},{"answer":"Fastify supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://fastify.dev","question":"What platforms does Fastify support?","confidence":0.6},{"answer":"Yes. Fastify can be deployed cloud / SaaS and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://fastify.dev","question":"Can Fastify be self-hosted?","confidence":0.6},{"answer":"We have confirmed 26 integrations for Fastify, including Next.js, Apollo Server, Angular, PostgreSQL, MongoDB, Redis, Elasticsearch and Swagger/OpenAPI, plus 18 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://fastify.dev","question":"What does Fastify integrate with?","confidence":0.6},{"answer":"Yes. Fastify is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/fastify/fastify","question":"Is Fastify open source?","confidence":0.95}]` |
| deployment.options | `{"cloud":true,"self_hosted":true}` | `{"cloud":true}` |
| description.long | An open-source framework that extends the .NET platform with tools and libraries for creating modern, cloud-based web applications and services deployable across Windows, Linux, and macOS | A Node.js web framework emphasizing fast request handling and low resource consumption while maintaining strong security, input validation, and developer experience. |
| features.capabilities | `{"language":"C#","api_first":true,"api_routes":true,"async_model":"event-loop-async","orm_included":true,"openapi_autogen":true,"language_runtime":"C#/.NET","templating_included":true,"dependency_injection":true}` | `{"language":"JavaScript/TypeScript","api_first":true,"api_routes":true,"async_model":"event-loop-async","file_routing":true,"cli_scaffolding":true,"openapi_autogen":true,"language_runtime":"JS/TS","typescript_first":true,"websocket_support":true,"dependency_injection":true}` |
| integrations.count | 4 | 28 |
| integrations.list | `[{"name":"Google"},{"name":"X"},{"name":"OpenAI"},{"name":"Azure"},{"name":"Power Apps"},{"name":"Power Platform","native":true,"category":"platform","direction":"outbound"}]` | `[{"name":"Next.js"},{"name":"Apollo Server"},{"name":"Angular"},{"name":"PostgreSQL"},{"name":"MongoDB"},{"name":"Redis"},{"name":"Elasticsearch"},{"name":"Swagger/OpenAPI"},{"name":"WebSocket"},{"name":"JWT"},{"name":"Helmet"},{"name":"Sentry"},{"name":"RabbitMQ"},{"name":"CORS"},{"name":"CSRF"},{"name":"OAuth2"},{"name":"Kubernetes"},{"name":"Firebase","native":false,"category":"auth"},{"name":"Mongoose","native":false,"category":"database"},{"name":"TypeORM","native":false,"category":"database"},{"name":"OAuth","native":false,"category":"auth"},{"name":"GraphQL","native":false,"category":"api"},{"name":"Swagger","native":false,"category":"documentation"},{"name":"OpenAPI","native":false,"category":"documentation"},{"name":"React","native":false,"category":"frontend"},{"name":"Vue","native":false,"category":"frontend"},{"name":"GCP Cloud Storage","native":false,"category":"storage"},{"name":"Casbin","native":false,"category":"authorization"},{"name":"ObjctionJS","native":false,"category":"database"},{"name":"AWS Lambda","native":false,"category":"cloud","direction":"outbound"},{"name":"Svelte","native":false,"category":"frontend","direction":"outbound"},{"name":"AMQP","native":false,"category":"messaging","direction":"bidirectional"},{"name":"Express","native":false,"category":"framework","direction":"outbound"},{"name":"Koa","native":false,"category":"framework","direction":"outbound"},{"name":"Hapi","native":false,"category":"framework","direction":"outbound"},{"name":"Nuxt","native":false,"category":"framework","direction":"outbound"},{"name":"Stoplight Elements","native":false,"category":"documentation","direction":"outbound"},{"name":"Server-Sent Events","native":false,"category":"protocol","direction":"outbound"},{"name":"TypeBox","native":true,"category":"library","direction":"outbound"},{"name":"Valkey","native":false,"category":"caching","direction":"outbound"}]` |
| language.primary | - | JavaScript |
| license.spdx | - | MIT |
| platform.support | `{"mac":true,"web":true,"linux":true,"windows":true}` | `{"cli":true,"web":true}` |
| pricing | `{"type":"free","summary":"Free and open source","freeTier":true,"sourceUrl":"https://dotnet.microsoft.com/en-us/apps/aspnet","retrievedAt":"2026-10-05T12:44:19.114Z"}` | `{"type":"open_source","sourceUrl":"https://fastify.dev","retrievedAt":"2026-09-07T13:15:46.651Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | free | commercial |
| pricing.price_level | free | free |
| pricing.transparent | yes | - |
| release.cadence_days | - | 4 |
| release.history | - | `[{"url":"https://github.com/fastify/fastify/releases/tag/v6.0.0-alpha.4","date":"2026-09-17T07:53:08Z","type":"prerelease","version":"v6.0.0-alpha.4"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.12.5","date":"2026-09-16T10:19:43Z","type":"stable","version":"v5.12.5"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.12.4","date":"2026-09-11T09:19:29Z","type":"stable","version":"v5.12.4"},{"url":"https://github.com/fastify/fastify/releases/tag/v6.0.0-alpha.3","date":"2026-09-04T09:21:10Z","type":"prerelease","version":"v6.0.0-alpha.3"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.12.2","date":"2026-09-04T08:20:39Z","type":"stable","version":"v5.12.2"},{"url":"https://github.com/fastify/fastify/releases/tag/v6.0.0-alpha.2","date":"2026-08-19T01:54:36Z","type":"prerelease","version":"v6.0.0-alpha.2"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.12.1","date":"2026-08-18T19:51:41Z","type":"stable","version":"v5.12.1"},{"url":"https://github.com/fastify/fastify/releases/tag/v6.0.0-alpha.1","date":"2026-08-13T15:57:10Z","type":"prerelease","version":"v6.0.0-alpha.1"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.12.0","date":"2026-08-13T15:55:21Z","type":"stable","version":"v5.12.0"},{"url":"https://github.com/fastify/fastify/releases/tag/v6.0.0-alpha.0","date":"2026-08-11T08:32:37Z","type":"prerelease","version":"v6.0.0-alpha.0"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.11.3","date":"2026-08-08T06:55:46Z","type":"stable","version":"v5.11.3"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.11.2","date":"2026-08-03T08:21:47Z","type":"stable","version":"v5.11.2"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.11.1","date":"2026-08-03T08:10:10Z","type":"stable","version":"v5.11.1"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.11.0","date":"2026-07-30T09:32:16Z","type":"stable","version":"v5.11.0"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.10.0","date":"2026-07-05T09:37:06Z","type":"stable","version":"v5.10.0"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.9.0","date":"2026-06-28T08:21:36Z","type":"stable","version":"v5.9.0"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.8.5","date":"2026-04-14T12:09:02Z","type":"stable","version":"v5.8.5"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.8.4","date":"2026-03-23T10:31:20Z","type":"stable","version":"v5.8.4"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.8.3","date":"2026-03-23T10:20:21Z","type":"stable","version":"v5.8.3"},{"url":"https://github.com/fastify/fastify/releases/tag/v5.8.2","date":"2026-03-07T09:42:46Z","type":"stable","version":"v5.8.2"}]` |
| security.scorecard | - | 8.3 |
| security.vulnerabilities | - | `{"count":17,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=fastify&per_page=100","last_12m":12,"max_severity":"HIGH"}` |

## Capabilities (Web Frameworks)

| Capability | ASP.NET Core | Fastify |
|---|:--:|:--:|
| **Core** |  |  |
| Rendering model | - | - |
| File-based routing | - | ✓ |
| Language | C# | JavaScript/TypeScript |
| **Rendering** |  |  |
| Server components | - | - |
| Streaming SSR | - | - |
| **Fullstack** |  |  |
| Built-in API / backend routes | ✓ | ✓ |
| **DX** |  |  |
| First-class TypeScript | - | ✓ |
| Fast refresh / HMR | - | - |
| **Deployment** |  |  |
| Edge runtime support | - | - |

*Source: vioscaleAI. Generated 2026-10-16T19:03:32.500Z. "-" = undocumented, not absent.*