# Ktor vs Ruby on Rails

**Leader by Vioscale score:** Ruby on Rails

| Attribute | Ktor | Ruby on Rails |
|---|---|---|
| **Vioscale score** | 60.8 (49% (low)) | 66.5 (52% (medium)) |
| activity.commits_last_30d | 57 | 100 |
| adoption.dependent_repos | 1,171 | 1,358,186 |
| adoption.github_stars | 14,503 | 58,719 |
| deployment.options | - | `{"cloud":true,"self_hosted":true}` |
| description.long | Ktor is an open-source framework for creating asynchronous server and client applications, from microservices to HTTP clients. Built on Kotlin and coroutines, it emphasizes simplicity, lightweight design, and extensibility. | A Ruby-based framework bundling everything needed for web development: database management, templating engines, email delivery, real-time updates, async job handling, file storage, and built-in protections against common attacks like SQL injection and cross-site scripting. |
| features.capabilities | `{"language":"Kotlin"}` | `{"language":"Ruby","rendering":"ssr","api_routes":true,"typescript_first":false}` |
| language.primary | Kotlin | Ruby |
| license.spdx | Apache-2.0 | MIT |
| platform.support | - | `{"mac":true,"web":true,"linux":true,"windows":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://ktor.io/","retrievedAt":"2026-08-13T23:07:06.179Z"}` | `{"type":"open_source","sourceUrl":"https://rubyonrails.org","retrievedAt":"2026-08-16T21:36:16.955Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | open_source | open_source |
| pricing.price_level | free | free |
| release.cadence_days | 27 | - |
| release.history | `[{"url":"https://github.com/ktorio/ktor/releases/tag/3.5.2","date":"2026-08-04T12:08:07Z","type":"stable","version":"3.5.2"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.5.1","date":"2026-06-29T08:05:31Z","type":"stable","version":"3.5.1"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.5.0","date":"2026-05-18T06:57:48Z","type":"stable","version":"3.5.0"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.4.3","date":"2026-04-23T11:20:32Z","type":"stable","version":"3.4.3"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.4.2","date":"2026-03-30T13:37:19Z","type":"stable","version":"3.4.2"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.4.1","date":"2026-03-04T14:20:52Z","type":"stable","version":"3.4.1"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.4.0","date":"2026-01-23T08:55:39Z","type":"stable","version":"3.4.0"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.3.3","date":"2025-11-27T12:13:53Z","type":"stable","version":"3.3.3"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.3.2","date":"2025-11-05T14:08:06Z","type":"stable","version":"3.3.2"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.3.1","date":"2025-10-10T06:19:56Z","type":"stable","version":"3.3.1"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.3.0","date":"2025-09-12T11:59:39Z","type":"stable","version":"3.3.0"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.2.3","date":"2025-07-29T14:18:09Z","type":"stable","version":"3.2.3"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.2.2","date":"2025-07-14T11:45:21Z","type":"stable","version":"3.2.2"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.2.1","date":"2025-07-04T08:57:57Z","type":"stable","version":"3.2.1"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.2.0","date":"2025-06-13T12:19:28Z","type":"stable","version":"3.2.0"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.1.3","date":"2025-05-06T11:52:28Z","type":"stable","version":"3.1.3"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.1.2","date":"2025-03-28T09:27:52Z","type":"stable","version":"3.1.2"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.1.1","date":"2025-02-25T11:49:42Z","type":"stable","version":"3.1.1"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.1.0","date":"2025-02-12T11:44:49Z","type":"stable","version":"3.1.0"},{"url":"https://github.com/ktorio/ktor/releases/tag/3.0.3","date":"2024-12-19T14:25:41Z","type":"stable","version":"3.0.3"}]` | `[{"url":"https://github.com/rails/rails/releases/tag/v8.1.3.1","date":"2026-07-29T14:59:54Z","type":"stable","version":"v8.1.3.1"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5.1","date":"2026-07-29T15:08:22Z","type":"stable","version":"v8.0.5.1"},{"url":"https://github.com/rails/rails/releases/tag/v7.2.3.2","date":"2026-07-29T15:05:22Z","type":"stable","version":"v7.2.3.2"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.3","date":"2026-03-24T20:26:02Z","type":"stable","version":"v8.1.3"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5","date":"2026-03-24T20:19:33Z","type":"stable","version":"v8.0.5"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.2.1","date":"2026-03-23T19:42:42Z","type":"stable","version":"v8.1.2.1"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.4.1","date":"2026-03-23T19:38:25Z","type":"stable","version":"v8.0.4.1"},{"url":"https://github.com/rails/rails/releases/tag/v7.2.3.1","date":"2026-03-23T19:32:34Z","type":"stable","version":"v7.2.3.1"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.2","date":"2026-01-08T20:17:17Z","type":"stable","version":"v8.1.2"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.1","date":"2025-10-28T23:46:29Z","type":"stable","version":"v8.1.1"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.4","date":"2025-10-28T23:43:23Z","type":"stable","version":"v8.0.4"},{"url":"https://github.com/rails/rails/releases/tag/v7.2.3","date":"2025-10-28T23:24:18Z","type":"stable","version":"v7.2.3"},{"url":"https://github.com/rails/rails/releases/tag/v7.1.6","date":"2025-10-28T23:19:19Z","type":"stable","version":"v7.1.6"},{"url":"https://github.com/rails/rails/releases/tag/v7.0.10","date":"2025-10-28T23:12:55Z","type":"stable","version":"v7.0.10"},{"url":"https://github.com/rails/rails/releases/tag/v7.0.9","date":"2025-10-28T23:02:29Z","type":"stable","version":"v7.0.9"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.0","date":"2025-10-22T00:35:05Z","type":"stable","version":"v8.1.0"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.0.rc1","date":"2025-10-15T00:50:43Z","type":"prerelease","version":"v8.1.0.rc1"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.3","date":"2025-09-22T22:19:48Z","type":"stable","version":"v8.0.3"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.0.beta1","date":"2025-09-04T12:30:05Z","type":"prerelease","version":"v8.1.0.beta1"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.2.1","date":"2025-08-13T20:38:30Z","type":"stable","version":"v8.0.2.1"}]` |
| security.disclosure_policy | - | yes |
| security.scorecard | 4.6 | 6.8 |
| security.vulnerabilities | `{"count":1,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=io.ktor%3Aktor-client-cio&per_page=100","last_12m":0,"max_severity":"LOW"}` | `{"count":18,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=rubygems&package_name=activesupport&per_page=100","last_12m":3,"max_severity":"CRITICAL"}` |

## Capabilities (Web Frameworks)

| Capability | Ktor | Ruby on Rails |
|---|:--:|:--:|
| **Core** |  |  |
| Rendering model | - | Server-side |
| File-based routing | - | - |
| Language | Kotlin | Ruby |
| **Rendering** |  |  |
| Server components | - | - |
| Streaming SSR | - | - |
| **Fullstack** |  |  |
| Built-in API / backend routes | - | ✓ |
| **DX** |  |  |
| First-class TypeScript | - | ✗ |
| Fast refresh / HMR | - | - |
| **Deployment** |  |  |
| Edge runtime support | - | - |

*Source: Vioscale. Generated 2026-09-01T17:14:58.546Z. "-" = undocumented, not absent.*