GraphQL Kotlin

Self-hosted · API

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Freedom report

Two barsScore 6.3

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely0 of 6 device platforms
DocumentedPlans, terms and facts published

GraphQL Kotlin is ranked #8 of 25 in GraphQL tools on Freedom251. It runs on API, Self-hosted. There is a free plan.

GraphQL Kotlin plans and pricing

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Open source Free Apache License 2.0 github.com · 4 Oct 2026

Compared on GraphQL tools

Free plan: Yes
Deployment model: self-hosted
Client code generation: Yes
Operation testing: Yes
Server languages: Kotlin

Best GraphQL Kotlin alternatives

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Two bars Altair GraphQL Client Free tier No. 1Free6.7 Two bars Apollo Studio Free tier No. 2$5/mo6.7 Two bars Apollo Client Free tier No. 3$5/mo6.6 One bar GraphQL Hive Free tier No. 4$20/mo6.4 One bar Hot Chocolate Free tier No. 5Free6.4 One bar WunderGraph Cosmo Free tier No. 6$499/mo6.4

The record

Purpose: GraphQL Kotlin is a collection of libraries built on graphql-java to run GraphQL clients and servers in Kotlin.
Schema generation: Its schema generator creates a GraphQL schema from Kotlin code and can expose it through a server library.
Federation: The federation module can generate Apollo Federation compliant schemas.
Client generation: Gradle and Maven plugins generate type-safe Kotlin client code from an existing GraphQL schema.
Client features: Clients support query and mutation operations, batching, coroutines, custom scalars, and configurable enum defaults.
Serialization: Generated client models support Jackson and kotlinx.serialization formats.
Integrations: Reference client implementations use Ktor HTTP Client and Spring WebClient, and custom implementations can use other engines.
Server integrations: The project provides Spring Boot and Ktor server implementations; the Spring server uses Spring WebFlux.
Subscriptions: The Ktor server supports Kotlin Flow subscriptions over WebSockets using the graphql-transport-ws subprotocol.
Server configuration: The Ktor plugin does not configure routes automatically, allowing applications to selectively enable routes and wrap them with logic such as authentication.
Security policy: The repository directs users to its security policy for reporting issues and information about versions receiving security updates.
License: The library is licensed under Apache License 2.0.
Support: The maintainers invite questions through GitHub Discussions and the public #graphql-kotlin channel on Kotlin Slack.
Intended users: The project describes its common use cases as running a GraphQL server and generating a type-safe client in Kotlin.
Price from: Free

Where it ranks on Freedom251

Best GraphQL Tools in 2026#8 of 25

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Sources

opensource.expediagroup.com/graphql-kotlin/docs/· checked 4 Oct 2026
opensource.expediagroup.com/graphql-kotlin/docs/client/client-overv· checked 4 Oct 2026
opensource.expediagroup.com/graphql-kotlin/docs/client/client-featu· checked 4 Oct 2026
opensource.expediagroup.com/graphql-kotlin/docs/server/spring-serve· checked 4 Oct 2026
opensource.expediagroup.com/graphql-kotlin/docs/server/ktor-server/· checked 4 Oct 2026
opensource.expediagroup.com/graphql-kotlin/docs/10.x.x/server/ktor-· checked 4 Oct 2026
github.com/ExpediaGroup/graphql-kotlin/blob/master· checked 4 Oct 2026
github.com/ExpediaGroup/graphql-kotlin· checked 4 Oct 2026
opensource.expediagroup.com/graphql-kotlin/docs/8.x.x/examples/· checked 4 Oct 2026
opensource.expediagroup.com/graphql-kotlin/docs/server/ktor-server/· checked 4 Oct 2026
opensource.expediagroup.com/graphql-kotlin/docs/schema-generator/wr· checked 4 Oct 2026