# Flask vs NestJS

**Leader by vioscaleAI score:** NestJS

| Attribute | Flask | NestJS |
|---|---|---|
| **vioscaleAI score** | 63.1 (66% (medium)) | 74.6 (76% (high)) |
| activity.commits_last_30d | 11 | 100 |
| adoption.dependent_repos | 119,058 | 78,848 |
| adoption.github_stars | 74,889 | 76,788 |
| content.faq | `[{"answer":"A Python web framework that makes it straightforward for developers to start building web applications, while maintaining the capability to handle large and sophisticated projects. It is indexed under Web Frameworks.","source":"https://flask.palletsprojects.com","question":"What is Flask?","confidence":0.6},{"answer":"Flask is open source, so it can be self-hosted and used at no licence cost. It is released under the BSD-3-Clause licence. Pricing changes often, so verify at source before relying on it.","source":"https://flask.palletsprojects.com","question":"Is Flask free to use?","confidence":0.6},{"answer":"Flask supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://flask.palletsprojects.com","question":"What platforms does Flask support?","confidence":0.6},{"answer":"Yes. Flask is published under the BSD-3-Clause 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/pallets/flask","question":"Is Flask open source?","confidence":0.95}]` | `[{"answer":"A progressive Node.js framework built with TypeScript that emphasizes structured architecture, dependency injection, and microservice support for building server-side applications. It is indexed under Web Frameworks.","source":"https://nestjs.com","question":"What is NestJS?","confidence":0.6},{"answer":"NestJS offers a free tier, so you can start without paying. Pricing changes often, so verify at source before relying on it.","source":"https://nestjs.com","question":"Is NestJS free?","confidence":0.6},{"answer":"NestJS supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://nestjs.com","question":"What platforms does NestJS support?","confidence":0.6},{"answer":"Yes. NestJS can be deployed cloud / SaaS and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://nestjs.com","question":"Can NestJS be self-hosted?","confidence":0.6},{"answer":"We have confirmed 9 integrations for NestJS, including Express, Fastify, GraphQL, TypeORM, Swagger/OpenAPI, Bull, WebSockets and Microservices, plus 1 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://nestjs.com","question":"What does NestJS integrate with?","confidence":0.6},{"answer":"Yes. NestJS 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/nestjs/nest","question":"Is NestJS open source?","confidence":0.95}]` |
| deployment.options | - | `{"cloud":true,"self_hosted":true}` |
| description.long | A Python-based web framework that emphasizes simple setup while scaling to support complex, production-grade applications | A progressive Node.js framework built with TypeScript that emphasizes structured architecture, dependency injection, and microservice support for building server-side applications. |
| features.capabilities | `{"language":"Python","rendering":"ssr","api_routes":true,"hot_reload":true,"file_routing":false,"streaming_ssr":true,"language_runtime":"Python","typescript_first":false,"architecture_style":"minimalist","templating_included":true,"testing_framework_included":true}` | `{"language":"TypeScript/JavaScript","api_first":true,"api_routes":true,"async_model":"event-loop-async","cli_scaffolding":true,"openapi_autogen":true,"language_runtime":"JS/TS","typescript_first":true,"websocket_support":true,"architecture_style":"structured-di","dependency_injection":true}` |
| integrations.count | - | 9 |
| integrations.list | - | `[{"name":"Express"},{"name":"Fastify"},{"name":"GraphQL"},{"name":"TypeORM"},{"name":"Swagger/OpenAPI"},{"name":"Bull"},{"name":"WebSockets"},{"name":"Microservices"},{"name":"Angular Universal"}]` |
| language.primary | Python | TypeScript |
| license.spdx | BSD-3-Clause | MIT |
| market.availability | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"web":true}` | `{"cli":true}` |
| pricing | `{"type":"open_source","sourceUrl":"https://flask.palletsprojects.com","retrievedAt":"2026-09-07T13:13:42.073Z"}` | `{"type":"hybrid","freeTier":true,"sourceUrl":"https://nestjs.com","retrievedAt":"2026-08-21T12:46:31.197Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | open_source | commercial |
| pricing.price_level | free | low |
| pricing.transparent | - | no |
| release.cadence_days | 63 | 3 |
| release.history | `[{"url":"https://github.com/pallets/flask/releases/tag/3.1.3","date":"2026-02-19T05:01:30Z","type":"stable","version":"3.1.3"},{"url":"https://github.com/pallets/flask/releases/tag/3.1.2","date":"2025-08-19T21:03:31Z","type":"stable","version":"3.1.2"},{"url":"https://github.com/pallets/flask/releases/tag/3.1.1","date":"2025-05-13T15:01:32Z","type":"stable","version":"3.1.1"},{"url":"https://github.com/pallets/flask/releases/tag/3.1.0","date":"2024-11-13T18:29:05Z","type":"stable","version":"3.1.0"},{"url":"https://github.com/pallets/flask/releases/tag/3.0.3","date":"2024-04-07T19:27:16Z","type":"stable","version":"3.0.3"},{"url":"https://github.com/pallets/flask/releases/tag/3.0.2","date":"2024-02-03T21:12:56Z","type":"stable","version":"3.0.2"},{"url":"https://github.com/pallets/flask/releases/tag/3.0.1","date":"2024-01-18T20:03:56Z","type":"stable","version":"3.0.1"},{"url":"https://github.com/pallets/flask/releases/tag/3.0.0","date":"2023-09-30T14:38:50Z","type":"stable","version":"3.0.0"},{"url":"https://github.com/pallets/flask/releases/tag/2.3.3","date":"2023-08-21T19:52:49Z","type":"stable","version":"2.3.3"},{"url":"https://github.com/pallets/flask/releases/tag/2.2.5","date":"2023-05-02T14:43:59Z","type":"stable","version":"2.2.5"},{"url":"https://github.com/pallets/flask/releases/tag/2.3.2","date":"2023-05-01T15:43:14Z","type":"stable","version":"2.3.2"},{"url":"https://github.com/pallets/flask/releases/tag/2.3.1","date":"2023-04-25T21:22:11Z","type":"stable","version":"2.3.1"},{"url":"https://github.com/pallets/flask/releases/tag/2.3.0","date":"2023-04-25T18:43:20Z","type":"stable","version":"2.3.0"},{"url":"https://github.com/pallets/flask/releases/tag/2.2.4","date":"2023-04-25T17:53:24Z","type":"stable","version":"2.2.4"},{"url":"https://github.com/pallets/flask/releases/tag/2.2.3","date":"2023-02-15T22:44:40Z","type":"stable","version":"2.2.3"},{"url":"https://github.com/pallets/flask/releases/tag/2.2.2","date":"2022-08-08T23:28:14Z","type":"stable","version":"2.2.2"},{"url":"https://github.com/pallets/flask/releases/tag/2.2.1","date":"2022-08-03T23:53:45Z","type":"stable","version":"2.2.1"},{"url":"https://github.com/pallets/flask/releases/tag/2.2.0","date":"2022-08-02T00:20:32Z","type":"stable","version":"2.2.0"},{"url":"https://github.com/pallets/flask/releases/tag/2.1.3","date":"2022-07-13T21:01:09Z","type":"stable","version":"2.1.3"},{"url":"https://github.com/pallets/flask/releases/tag/2.1.2","date":"2022-04-28T17:48:46Z","type":"stable","version":"2.1.2"}]` | `[{"url":"https://github.com/nestjs/nest/releases/tag/v12.1.1","date":"2026-09-28T09:06:52Z","type":"stable","version":"v12.1.1"},{"url":"https://github.com/nestjs/nest/releases/tag/v12.1.0","date":"2026-09-23T08:00:20Z","type":"stable","version":"v12.1.0"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.2.6","date":"2026-09-23T09:09:35Z","type":"stable","version":"v11.2.6"},{"url":"https://github.com/nestjs/nest/releases/tag/v12.0.4","date":"2026-09-21T08:03:41Z","type":"stable","version":"v12.0.4"},{"url":"https://github.com/nestjs/nest/releases/tag/v12.0.3","date":"2026-09-15T07:57:13Z","type":"stable","version":"v12.0.3"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.2.5","date":"2026-09-15T07:11:48Z","type":"stable","version":"v11.2.5"},{"url":"https://github.com/nestjs/nest/releases/tag/v12.0.2","date":"2026-09-14T13:53:20Z","type":"stable","version":"v12.0.2"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.2.4","date":"2026-09-14T18:15:40Z","type":"stable","version":"v11.2.4"},{"url":"https://github.com/nestjs/nest/releases/tag/v12.0.0","date":"2026-08-27T12:23:49Z","type":"stable","version":"v12.0.0"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.2.3","date":"2026-08-25T10:59:41Z","type":"stable","version":"v11.2.3"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.2.2","date":"2026-08-25T07:59:18Z","type":"stable","version":"v11.2.2"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.2.1","date":"2026-08-14T17:53:21Z","type":"stable","version":"v11.2.1"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.2.0","date":"2026-08-14T12:13:03Z","type":"stable","version":"v11.2.0"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.1.29","date":"2026-08-10T09:40:32Z","type":"stable","version":"v11.1.29"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.1.28","date":"2026-07-08T08:33:50Z","type":"stable","version":"v11.1.28"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.1.27","date":"2026-06-15T09:17:02Z","type":"stable","version":"v11.1.27"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.1.26","date":"2026-06-08T12:37:55Z","type":"stable","version":"v11.1.26"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.1.25","date":"2026-06-08T07:39:37Z","type":"stable","version":"v11.1.25"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.1.24","date":"2026-05-25T08:41:52Z","type":"stable","version":"v11.1.24"},{"url":"https://github.com/nestjs/nest/releases/tag/v11.1.23","date":"2026-05-21T18:18:12Z","type":"stable","version":"v11.1.23"}]` |
| reliability.status_page | yes | - |
| security.fedramp | - | yes |
| security.scorecard | 7.1 | 7.6 |
| security.vulnerabilities | `{"count":5,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=flask&per_page=100","last_12m":1,"max_severity":"HIGH"}` | `{"count":1,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=%40nestjs%2Fcommon&per_page=100","last_12m":0,"max_severity":"MODERATE"}` |

## Capabilities (Web Frameworks)

| Capability | Flask | NestJS |
|---|:--:|:--:|
| **Core** |  |  |
| Rendering model | Server-side | - |
| File-based routing | ✗ | - |
| Language | Python | TypeScript/JavaScript |
| **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 2026-10-16T20:49:31.506Z. "-" = undocumented, not absent.*