Kotlin Multiplatform SDK for PostHog — type-safe analytics, feature flags, and event capture for every platform Kotlin runs on.
- Type-safe Result monad —
PostHogResult<T>withmap,flatMap,recover— no exceptions leak to callers - Optional Kotlin Result bridge — use
toKotlinResult()/toPostHogResult()when you prefer stdlibResult - Value class IDs —
DistinctId,ApiKey,FeatureFlagKey,GroupType,GroupKeyprevent mixups at compile time - Properties DSL — Build event properties with a clean Kotlin DSL instead of raw JSON
- Event capture with automatic batching — Queue events in memory, flush at threshold or on interval
- User identification — Associate distinct IDs with user properties via
identifyandalias - Group analytics — Associate users with companies, projects, or any custom group type
- Feature flags with caching — Fetch flags from
/decide, cache in memory, observe viaStateFlow - Multivariate flags — Boolean, string, and typed JSON payloads with
getTypedPayload<T>() - Super properties — Register properties that are merged into every subsequent event
- Opt in/out — Disable all capture with a single call, GDPR-friendly
- 15 platform targets — Android, iOS, macOS, tvOS, watchOS, JVM, Linux, Windows, and WasmJs
- Simple setup — Factory-based client creation
Add the dependencies you need to your build.gradle.kts:
[versions]
posthog-kmp = "0.1.2"
[libraries]
posthog-core = { module = "io.github.androidpoet:posthog-core", version.ref = "posthog-kmp" }
posthog-client = { module = "io.github.androidpoet:posthog-client", version.ref = "posthog-kmp" }
posthog-feature-flags = { module = "io.github.androidpoet:posthog-feature-flags", version.ref = "posthog-kmp" }kotlin {
sourceSets {
commonMain.dependencies {
implementation(libs.posthog.client) // includes posthog-core
implementation(libs.posthog.feature.flags) // optional
}
}
}val client = PostHog.create("phc_your_project_api_key") {
host = "https://us.i.posthog.com" // or "https://eu.i.posthog.com"
flushAt = 20
flushIntervalMs = 30_000L
logging = true
preloadFeatureFlags = true
}
val client = createPostHogClient("phc_your_project_api_key", config)
val flags = createFeatureFlagsClient(client)client.capture("page_viewed")
client.capture("button_clicked") {
"screen" to "home"
"button_id" to "cta_main"
"count" to 3
"is_premium" to true
}client.identify(
distinctId = "user_123",
userProperties = buildJsonObject {
put("name", "Jane Doe")
put("email", "jane@example.com")
put("plan", "pro")
},
)val flags = createFeatureFlagsClient(client)
flags.loadFlags(distinctId = "user_123")
if (flags.isFeatureEnabled("new-dashboard")) {
showNewDashboard()
}
val variant = flags.getStringFlag("onboarding-flow", defaultValue = "control")
@Serializable
data class DiscountConfig(val percent: Int, val code: String)
val discount = flags.getTypedPayload<DiscountConfig>("summer-sale")
flags.flagsFlow.collect { allFlags ->
val enabled = allFlags.filter { it.value.isEnabled }
println("Enabled flags: ${enabled.keys}")
}client.group(
groupType = "company",
groupKey = "company_abc",
groupProperties = buildJsonObject {
put("name", "Acme Corp")
put("plan", "enterprise")
put("employee_count", 250)
},
)client.flush()
client.reset()
client.close()┌─────────────────────────────────────────────────────────┐
│ Your App │
├──────────────┬──────────────────┬────────────────────────┤
│ posthog- │ posthog- │ posthog- │
│ feature- │ client │ core │
│ flags │ │ │
│ │ PostHogClient │ PostHogResult │
│ /decide │ HttpTransport │ Properties DSL │
│ Cache │ Event Queue │ Value IDs │
│ StateFlow │ Batch Flush │ Models │
│ Typed │ Super Props │ Serialization │
│ Payloads │ Factory API │ Error Types │
│ ├──────────────────┤ │
│ │ Ktor Engines │ │
│ │ OkHttp · Darwin │ │
│ │ CIO · Js │ │
└──────────────┴──────────────────┴────────────────────────┘
| Module | Artifact | Description |
|---|---|---|
| posthog-core | io.github.androidpoet:posthog-core |
Result monad, error types, value class IDs, event/flag models |
| posthog-client | io.github.androidpoet:posthog-client |
HTTP transport, event capture, batching, identify, groups |
| posthog-feature-flags | io.github.androidpoet:posthog-feature-flags |
Feature flag evaluation, caching, StateFlow observation, typed payloads |
| Platform | Target | Ktor Engine |
|---|---|---|
| Android | androidTarget() |
OkHttp |
| JVM | jvm() |
OkHttp |
| iOS | iosX64() iosArm64() iosSimulatorArm64() |
Darwin |
| macOS | macosX64() macosArm64() |
Darwin |
| tvOS | tvosX64() tvosArm64() tvosSimulatorArm64() |
Darwin |
| watchOS | watchosX64() watchosArm64() watchosSimulatorArm64() |
Darwin |
| Linux | linuxX64() |
CIO |
| Windows | mingwX64() |
CIO |
| Web | wasmJs() |
Js |
| posthog-kmp | posthog-android (official) | |
|---|---|---|
| Platforms | 15 KMP targets | Android only |
| Error handling | PostHogResult<T> monad |
Thrown exceptions |
| Type safety | Value class IDs | String IDs |
| Feature flags | Cached + StateFlow |
Cached |
| Properties | Kotlin DSL | Map builders |
| Dependencies | 3 core | Platform-specific |
| Codebase | ~2K LOC | ~15K LOC |
| Layer | Library |
|---|---|
| Language | Kotlin 2.1.10 |
| Networking | Ktor 3.1.1 |
| Serialization | kotlinx.serialization 1.8.0 |
| Coroutines | kotlinx.coroutines 1.10.1 |
| Date/Time | kotlinx-datetime 0.6.2 |
| Publishing | vanniktech maven-publish 0.30.0 |
# Compile all targets
./gradlew compileKotlinJvm
# Run tests
./gradlew jvmTest
# Full build (all platforms)
./gradlew build --no-configuration-cache
# Publish to Maven Central (CI only)
./gradlew publishAllPublicationsToMavenCentral --no-configuration-cacheContributions are welcome! If you've found a bug, have an idea for an improvement, or want to contribute new features, please open an issue or submit a pull request.
Support it by joining stargazers for this repository. ⭐
Also, follow me on GitHub for my next creations! 🤩
MIT License
Copyright (c) 2026 Ranbir Singh
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.