Ktor
Framework for building async server and client applications in Kotlin
- Also known as
- ktor
What is Ktor?
A Kotlin framework that uses asynchronous I/O and coroutines to build server-side, client-side, and microservice applications.
Ktor pricing
We don't have Ktor's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
What Ktor does
The capabilities that matter for web frameworks, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Rendering model
- -
- File-based routing
- -
- Language
- Kotlin
- Server components
- -
- Streaming SSR
- -
- Built-in API / backend routes
- ✓
- First-class TypeScript
- ✗
- Fast refresh / HMR
- ✓
- Edge runtime support
- -
Platform & deployment
Independently observed- Web
- Cloud / SaaS
- Self-hosted
Security & compliance
Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality
Ktor FAQ
Common questions about Ktor, answered from independent, dated evidence.
What is Ktor?
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. It is indexed under Web Frameworks.
Source: https://ktor.io/
Is Ktor free to use?
Ktor is open source, so it can be self-hosted and used at no licence cost. It is released under the Apache-2.0 licence. Pricing changes often, so verify at source before relying on it.
Source: https://ktor.io/
Is Ktor open source?
Yes. Ktor is published under the Apache-2.0 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/ktorio/ktor
Ktor alternatives
Other web frameworks we track, ranked by the same independent score.
- Next.jsA full-stack React framework for building web applications with integrated routing, rendering, and caching.high · 77%
- FastAPIModern, high-performance Python framework for building APIsmedium · 69%
- NuxtA framework for building full-featured web applications with Vue.js, handling both frontend and backend automaticallyhigh · 78%
- DjangoA web framework for rapid development of high-quality applicationsmedium · 72%
- ExpressA minimal, unopinionated Node.js web server framework for building applications and APIshigh · 78%
- NestJSA rapidly-adopted Node.js framework for creating efficient, dependable, and scalable backend applicationshigh · 79%
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Ktor, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Development activity | 63 | 0.12 | 7.5 | ✓ |
| Release cadence | 85 | 0.07 | 5.7 | ✓ |
| Dependent projects | 54 | 0.08 | 4.3 | ✓ |
| Capabilities | 46 | 0.08 | 3.8 | ✓ |
| Stars | 79 | 0.03 | 2.6 | ✓ |
| Security score | 46 | 0.05 | 2.4 | ✓ |
| Integrations | 0 | 0.05 | 0.0 | - |
| Security posture | 0 | 0.09 | 0.0 | - |
| Package downloads | 0 | 0.17 | 0.0 | - |
| Developer Q&A activity | 0 | 0.08 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 98 | mediumsource · 2026-09-10 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 3 items | mediumsource · 2026-09-10 · 72% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Language: Kotlin · Api routes: Yes · Hot reload: Yes · Typescript first: No | mediumsource · 2026-09-10 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | Kotlin | highsource · 2026-09-10 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | Apache-2.0 | highsource · 2026-09-10 · 95% |
Pricing
Release
Security
Is Ktor the right choice for you?
Tell us the job, the constraints and what you weigh most, and we will rank Ktor against the rest of the web frameworks we index, using the same dated evidence weighted your way.
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