v0.2.0 · standalone build engine

Build mobile apps in HTML, CSS & JS.

One binary. Drop in your app source. Get a signed APK or IPA back. Extend it with your own Kotlin and Swift plugins — called from your app like any typed JS module.

Download binary See how it works

By the numbers

Built different.

binary

two platforms, one artefact

$ file ./eximia
./eximia: ELF 64-bit · also macos aarch64
$ ls -lh ./eximia
-rwxr-xr-x  2.1M  ./eximia

npm deps

no install dance

$ which node
node: command not found
$ ./eximia build --spec eximia.json
✓ works anyway

KSJ

bridge

kotlin · swift · js, typed

class WiFiInfo : SLMEximiaPlugin { … }
// from JS, fully typed:
await SLMEximia.plugin('WiFiInfo').scan()

~45s

build

typical signed APK

$ time ./eximia build --release
✓ signed app.apk  (135 MB)
real    0m45.123s

The replacement for Cordova

Cordova's 2010s API and npm-orchestrated install dance is the cost we stopped paying. Same WebView model, modern stack, single binary you own.

The 2010s way

Cordova

Spend an afternoon installing nine npm packages, then pray the plugin merger doesn't overwrite your manifest.

— Node + cordova CLI + platforms + plugin packages
— Callbacks and string identifiers
— Manifest conflicts merge silently
— Apache release cadence — you wait

The 2026 way

SLM Eximia

Download one binary, write one spec, run one command. Get a signed APK and IPA back.

✓ One self-contained binary, zero npm
✓ Promises, async/await, TypeScript types
✓ Manifests validated, conflicts logged
✓ You own the runtime, ship on your calendar

How it works

From spec to signed APK in one command.

Write a tiny eximia.json, drop your HTML/CSS/JS app source next to it, run the binary. Watch the build happen in real time.

~/my-app

$ cat eximia.json
{
  "appId":   "com.example.app",
  "version": "1.0.0",
  "platforms": ["android", "ios"],
  "app":     { "dir": "./www" },
  "plugins": ["./plugins/wifi-info"]
}

$ eximia build --spec eximia.json --out ./build/
  ✓ resolved plugins from spec          (1s)
  ✓ staged HTML/CSS/JS app from ./www   (0s)
  ✓ compiled Android runtime            (8s)
  ✓ assembled and signed app.apk        (36s)

$ ls build/
app.apk    app.ipa
$ _

Extend

Write it in Kotlin & Swift. Call it from JS.

Eximia ships with one working plugin — device-info — as a complete reference. Everything else, you write. The bridge does the marshalling; you focus on the platform code.

Android · Kotlin iOS · Swift plugins/wifi-info/src/

class WiFiInfo : SLMEximiaPlugin {
  override suspend fun execute(
    action: String,
    args: JSONObject,
    cb: SLMEximiaCallback,
  ) {
    when (action) {
      "scan" -> cb.success(scanWiFi())
      else -> cb.unknownAction(action)
    }
  }
}

final class WiFiInfo: SLMEximiaPlugin {
  func execute(
    action: String,
    args: [String: Any]
  ) async throws -> Any {
    switch action {
    case "scan": return try await scanWiFi()
    default: throw SLMEximiaError.unknownAction
    }
  }
}

App side · TypeScript www/app.ts

import { SLMEximia } from '@slm/eximia';

// Typed proxy generated from plugin.json.
const wifi = SLMEximia.plugin<WiFiInfo>('WiFiInfo');

const nets = await wifi.scan({ secured: true });
console.log(nets[0].ssid);  // "MyNetwork"

A plugin is a directory with plugin.json, a Kotlin source, a Swift source, and a JS entry. The CLI auto-injects permissions, Gradle deps, Info.plist keys, and SwiftPM packages declared in the manifest.

Guide · 10 min read Authoring an Eximia plugin End-to-end walkthrough of writing a wifi-info plugin from scratch: manifest, Kotlin, Swift, JS bridge, permissions, testing, distribution.

Get started

Run one command. Get the binary.

The installer detects your platform, fetches the matching binary from slmeximia.site/downloads, verifies the SHA-256, and drops eximia in ~/.local/bin. Linux x86_64 and aarch64 ship today; macOS arm64 next.

$ curl -fsSL https://slmeximia.site/install.sh | sh
   [eximia] host: linux/x86_64 → target=linux-x86_64
   [eximia] version: v0.2.0
   [eximia] downloading slm-eximia-v0.2.0-linux-x86_64
   [eximia] sha256 verified
   [eximia] installed → ~/.local/bin/eximia

$ eximia --version
slm-eximia 0.2.0

v0.2.0 live

First public release shipping today. New here? Start with the 10-minute quickstart — install, init, build, first APK in one sitting. Need an internal plugin? See licensing.