diff --git a/server/build.gradle.kts b/server/build.gradle.kts
index 47c3b91..9d167ab 100644
--- a/server/build.gradle.kts
+++ b/server/build.gradle.kts
@@ -15,6 +15,7 @@ compileKotlin.kotlinOptions {
 
 repositories {
     mavenCentral()
+    jcenter()
 }
 
 dependencies {
@@ -69,6 +70,16 @@ dependencies {
     implementation("org.slf4j:slf4j-api:1.8.0-beta4")
     implementation("com.fasterxml.jackson.core:jackson-databind:2.10.3")
 
+    // to get application content root
+    implementation("net.harawata:appdirs:1.2.0")
+
+    // Exposed ORM
+    val exposed_version = "0.28.1"
+    implementation ("org.jetbrains.exposed:exposed-core:$exposed_version")
+    implementation ("org.jetbrains.exposed:exposed-dao:$exposed_version")
+    implementation ("org.jetbrains.exposed:exposed-jdbc:$exposed_version")
+    implementation ("org.xerial:sqlite-jdbc:3.30.1")
+
 
     testImplementation("org.jetbrains.kotlin:kotlin-test")
     testImplementation("org.jetbrains.kotlin:kotlin-test-junit")
diff --git a/server/src/main/kotlin/eu/kanade/tachiyomi/extension/api/ExtensionGithubApi.kt b/server/src/main/kotlin/eu/kanade/tachiyomi/extension/api/ExtensionGithubApi.kt
index 8f41ef1..71593f2 100644
--- a/server/src/main/kotlin/eu/kanade/tachiyomi/extension/api/ExtensionGithubApi.kt
+++ b/server/src/main/kotlin/eu/kanade/tachiyomi/extension/api/ExtensionGithubApi.kt
@@ -7,6 +7,7 @@ import com.github.salomonbrys.kotson.int
 import eu.kanade.tachiyomi.extension.model.Extension
 import eu.kanade.tachiyomi.extension.model.LoadResult
 import eu.kanade.tachiyomi.extension.util.ExtensionLoader
+import ir.armor.tachidesk.database.model.ExtensionDataClass
 //import kotlinx.coroutines.Dispatchers
 //import kotlinx.coroutines.withContext
 import kotlinx.serialization.json.JsonArray
@@ -75,6 +76,10 @@ internal class ExtensionGithubApi {
         return "$REPO_URL_PREFIX/apk/${extension.apkName}"
     }
 
+    fun getApkUrl(extension: ExtensionDataClass): String {
+        return "$REPO_URL_PREFIX/apk/${extension.apkName}"
+    }
+
     companion object {
         const val BASE_URL = "https://raw.githubusercontent.com/"
         const val REPO_URL_PREFIX = "${BASE_URL}inorichi/tachiyomi-extensions/repo"
diff --git a/server/src/main/kotlin/ir/armor/tachidesk/Config.kt b/server/src/main/kotlin/ir/armor/tachidesk/Config.kt
new file mode 100644
index 0000000..c3822e5
--- /dev/null
+++ b/server/src/main/kotlin/ir/armor/tachidesk/Config.kt
@@ -0,0 +1,8 @@
+package ir.armor.tachidesk
+
+import net.harawata.appdirs.AppDirsFactory
+
+object Config {
+    val dataRoot = AppDirsFactory.getInstance().getUserDataDir("Tachidesk",null, null)
+    val extensionsRoot = "$dataRoot/extensions"
+}
\ No newline at end of file
diff --git a/server/src/main/kotlin/ir/armor/tachidesk/Main.kt b/server/src/main/kotlin/ir/armor/tachidesk/Main.kt
index 3dab39e..dbd71ca 100644
--- a/server/src/main/kotlin/ir/armor/tachidesk/Main.kt
+++ b/server/src/main/kotlin/ir/armor/tachidesk/Main.kt
@@ -2,26 +2,31 @@ package ir.armor.tachidesk
 
 import com.googlecode.dex2jar.tools.Dex2jarCmd
 import eu.kanade.tachiyomi.extension.api.ExtensionGithubApi
+import eu.kanade.tachiyomi.extension.model.Extension
 import eu.kanade.tachiyomi.network.NetworkHelper
 import eu.kanade.tachiyomi.source.model.MangasPage
 import eu.kanade.tachiyomi.source.online.HttpSource
 import io.javalin.Javalin
-import io.javalin.http.Context
+import ir.armor.tachidesk.database.makeDataBaseTables
+import ir.armor.tachidesk.database.model.ExtensionDataClass
+import ir.armor.tachidesk.database.model.ExtensionsTable
 import kotlinx.coroutines.runBlocking
 import okhttp3.Request
 import okio.buffer
 import okio.sink
+import org.jetbrains.exposed.sql.*
 import java.io.File
 import java.net.URL
 import java.net.URLClassLoader
-
+import org.jetbrains.exposed.sql.transactions.transaction
 
 class Main {
     companion object {
-        const val contentRoot = "/tmp/tachidesk"
+        var lastExtensionCheck: Long = 0
+
 
         @JvmStatic
-        fun downloadAPK(url: String, apkPath: String){
+        fun downloadAPKFile(url: String, apkPath: String) {
             val request = Request.Builder().url(url).build()
             val response = NetworkHelper().client.newCall(request).execute();
 
@@ -32,8 +37,8 @@ class Main {
         }
 
         @JvmStatic
-        fun testExtensionExecution(){
-            File(contentRoot).mkdirs()
+        fun testExtensionExecution() {
+            File(Config.extensionsRoot).mkdirs()
             var sourcePkg = ""
 
             // get list of extensions
@@ -48,20 +53,20 @@ class Main {
             }
 
             val apkFileName = apkToDownload.split("/").last()
-            val apkFilePath = "$contentRoot/$apkFileName"
+            val apkFilePath = "${Config.extensionsRoot}/$apkFileName"
             val zipDirPath = apkFilePath.substringBefore(".apk")
             val jarFilePath = "$zipDirPath.jar"
             val dexFilePath = "$zipDirPath.dex"
 
             // download apk file
-            downloadAPK(apkToDownload, apkFilePath)
+            downloadAPKFile(apkToDownload, apkFilePath)
 
 
             val className = APKExtractor.extract_dex_and_read_className(apkFilePath, dexFilePath)
             // dex -> jar
             Dex2jarCmd.main(dexFilePath, "-o", jarFilePath, "--force")
 
-            val child = URLClassLoader(arrayOf<URL>(URL("file:$jarFilePath")), this.javaClass.classLoader)
+            val child = URLClassLoader(arrayOf<URL>(URL("file:$jarFilePath")), this::class.java.classLoader)
             val classToLoad = Class.forName(className, true, child)
             val instance = classToLoad.newInstance() as HttpSource
             val result = instance.fetchPopularManga(1)
@@ -69,25 +74,145 @@ class Main {
             mangasPage.mangas.forEach {
                 println(it.title)
             }
-//            exitProcess(0)
+        }
+
+        fun extensionDatabaseIsEmtpy(): Boolean {
+            return transaction {
+                return@transaction ExtensionsTable.selectAll().count() == 0L
+            }
+        }
+
+        fun getExtensionList(offline: Boolean = false): List<ExtensionDataClass> {
+            // update if 60 seconds has passed or requested offline and database is empty
+            if (lastExtensionCheck + 60 * 1000 < System.currentTimeMillis() || (offline && extensionDatabaseIsEmtpy())) {
+                println("Getting extensions list from the internet")
+                lastExtensionCheck = System.currentTimeMillis()
+                var foundExtensions: List<Extension.Available>
+                runBlocking {
+                    val api = ExtensionGithubApi()
+                    foundExtensions = api.findExtensions()
+                    transaction {
+                        foundExtensions.forEach { foundExtension ->
+                            val extensionRecord = ExtensionsTable.select { ExtensionsTable.name eq foundExtension.name }.firstOrNull()
+                            if (extensionRecord != null) {
+                                // update the record
+                                ExtensionsTable.update({ ExtensionsTable.name eq foundExtension.name }) {
+                                    it[name] = foundExtension.name
+                                    it[pkgName] = foundExtension.pkgName
+                                    it[versionName] = foundExtension.versionName
+                                    it[versionCode] = foundExtension.versionCode
+                                    it[lang] = foundExtension.lang
+                                    it[isNsfw] = foundExtension.isNsfw
+                                    it[apkName] = foundExtension.apkName
+                                    it[iconUrl] = foundExtension.iconUrl
+                                }
+                            } else {
+                                // insert new record
+                                ExtensionsTable.insert {
+                                    it[name] = foundExtension.name
+                                    it[pkgName] = foundExtension.pkgName
+                                    it[versionName] = foundExtension.versionName
+                                    it[versionCode] = foundExtension.versionCode
+                                    it[lang] = foundExtension.lang
+                                    it[isNsfw] = foundExtension.isNsfw
+                                    it[apkName] = foundExtension.apkName
+                                    it[iconUrl] = foundExtension.iconUrl
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            return transaction {
+                return@transaction ExtensionsTable.selectAll().map {
+                    ExtensionDataClass(
+                            it[ExtensionsTable.name],
+                            it[ExtensionsTable.pkgName],
+                            it[ExtensionsTable.versionName],
+                            it[ExtensionsTable.versionCode],
+                            it[ExtensionsTable.lang],
+                            it[ExtensionsTable.isNsfw],
+                            it[ExtensionsTable.apkName],
+                            it[ExtensionsTable.iconUrl],
+                            it[ExtensionsTable.installed],
+                            it[ExtensionsTable.classFQName]
+                    )
+                }
+
+            }
+        }
+
+        fun downloadApk(apkName: String): Int {
+            val extension = getExtensionList(true).first { it.apkName == apkName }
+            val fileNameWithoutType = apkName.substringBefore(".apk")
+            val dirPathWithoutType = "${Config.extensionsRoot}/$apkName"
+
+            // check if we don't have the dex file already downloaded
+            val dexPath = "${Config.extensionsRoot}/$fileNameWithoutType.jar"
+            if (!File(dexPath).exists()) {
+                runBlocking {
+                    val api = ExtensionGithubApi()
+                    val apkToDownload = api.getApkUrl(extension)
+
+                    val apkFilePath = "$dirPathWithoutType.apk"
+                    val jarFilePath = "$dirPathWithoutType.jar"
+                    val dexFilePath = "$dirPathWithoutType.dex"
+
+                    // download apk file
+                    downloadAPKFile(apkToDownload, apkFilePath)
+
+
+                    val className: String = APKExtractor.extract_dex_and_read_className(apkFilePath, dexFilePath)
+
+                    // dex -> jar
+                    Dex2jarCmd.main(dexFilePath, "-o", jarFilePath, "--force")
+
+                    File(apkFilePath).delete()
+
+                    transaction {
+                        ExtensionsTable.update({ ExtensionsTable.name eq extension.name }) {
+                            it[installed] = true
+                            it[classFQName] = className
+                        }
+                    }
+
+                }
+                return 201 // we downloaded successfully
+            }
+            else {
+                return 302
+            }
         }
 
 
         @JvmStatic
         fun main(args: Array<String>) {
+            // make sure everything we need exists
+            File(Config.dataRoot).mkdirs()
+            File(Config.extensionsRoot).mkdirs()
+            makeDataBaseTables()
+
+
             val app = Javalin.create().start(4567)
 
             app.before() { ctx ->
-                ctx.header("Access-Control-Allow-Origin", "*")
+                ctx.header("Access-Control-Allow-Origin", "*") // allow the client which is running on another port
             }
 
             app.get("/api/v1/extensions") { ctx ->
-                runBlocking {
-                    val api = ExtensionGithubApi()
-                    val sources = api.findExtensions()
-                    ctx.json(sources)
-                }
+                ctx.json(getExtensionList())
             }
+
+
+            app.get("/api/v1/extensions/install/:apkName") { ctx ->
+                val apkName = ctx.pathParam("apkName")
+                println(apkName)
+                ctx.status(
+                        downloadApk(apkName)
+                )
+            }
+
         }
     }
 }
diff --git a/server/src/main/kotlin/ir/armor/tachidesk/database/DBMangaer.kt b/server/src/main/kotlin/ir/armor/tachidesk/database/DBMangaer.kt
new file mode 100644
index 0000000..807490a
--- /dev/null
+++ b/server/src/main/kotlin/ir/armor/tachidesk/database/DBMangaer.kt
@@ -0,0 +1,24 @@
+package ir.armor.tachidesk.database
+
+import ir.armor.tachidesk.Config
+import ir.armor.tachidesk.database.model.ExtensionsTable
+import ir.armor.tachidesk.database.model.SourcesTable
+import org.jetbrains.exposed.sql.Database
+import org.jetbrains.exposed.sql.SchemaUtils
+import org.jetbrains.exposed.sql.transactions.transaction
+
+object DBMangaer {
+    val db by lazy {
+        Database.connect("jdbc:sqlite:${Config.dataRoot}/database.db", "org.sqlite.JDBC")
+    }
+}
+
+fun makeDataBaseTables() {
+    // mention db object to connect
+    DBMangaer.db
+
+    transaction {
+        SchemaUtils.create(ExtensionsTable)
+        SchemaUtils.create(SourcesTable)
+    }
+}
\ No newline at end of file
diff --git a/server/src/main/kotlin/ir/armor/tachidesk/database/model/ExtensionTable.kt b/server/src/main/kotlin/ir/armor/tachidesk/database/model/ExtensionTable.kt
new file mode 100644
index 0000000..9cd3a05
--- /dev/null
+++ b/server/src/main/kotlin/ir/armor/tachidesk/database/model/ExtensionTable.kt
@@ -0,0 +1,37 @@
+package ir.armor.tachidesk.database.model
+
+import eu.kanade.tachiyomi.source.Source
+import org.jetbrains.exposed.dao.IntEntity
+import org.jetbrains.exposed.dao.IntEntityClass
+import org.jetbrains.exposed.dao.id.EntityID
+import org.jetbrains.exposed.dao.id.IntIdTable
+import org.jetbrains.exposed.sql.Column
+import org.jetbrains.exposed.sql.Table
+
+
+object ExtensionsTable : IntIdTable() {
+    val name = varchar("name", 128)
+    val pkgName = varchar("pkg_name", 128)
+    val versionName = varchar("version_name", 16)
+    val versionCode = integer("version_code")
+    val lang = varchar("lang", 5)
+    val isNsfw = bool("is_nsfw")
+    val apkName = varchar("apk_name", 1024)
+    val iconUrl = varchar("icon_url", 2048)
+
+    val installed = bool("installed").default(false)
+    val classFQName = varchar("class_name", 256).default("") // fully qualified name
+}
+
+data class ExtensionDataClass(
+        val name: String,
+        val pkgName: String,
+        val versionName: String,
+        val versionCode: Int,
+        val lang: String,
+        val isNsfw: Boolean,
+        val apkName: String,
+        val iconUrl : String,
+        val installed: Boolean,
+        val classFQName: String,
+)
diff --git a/server/src/main/kotlin/ir/armor/tachidesk/database/model/SourcesTable.kt b/server/src/main/kotlin/ir/armor/tachidesk/database/model/SourcesTable.kt
new file mode 100644
index 0000000..c83cbac
--- /dev/null
+++ b/server/src/main/kotlin/ir/armor/tachidesk/database/model/SourcesTable.kt
@@ -0,0 +1,26 @@
+package ir.armor.tachidesk.database.model
+
+import org.jetbrains.exposed.dao.Entity
+import org.jetbrains.exposed.dao.IntEntity
+import org.jetbrains.exposed.dao.IntEntityClass
+import org.jetbrains.exposed.dao.id.EntityID
+import org.jetbrains.exposed.sql.Column
+import org.jetbrains.exposed.sql.Table
+
+object SourcesTable : Table() {
+    val id: Column<Long> = long("id")
+    val name: Column<String> = varchar("name", 128)
+    val extension = reference("extension", ExtensionsTable)
+    override val primaryKey = PrimaryKey(id)
+}
+
+//class Source : Entity() {
+//    companion object : Entity<Source>(SourcesTable)
+//
+//    val name by ExtensionsTable.name
+//    val pkgName by ExtensionsTable.pkgName
+//    val versionName by ExtensionsTable.versionName
+//    val versionCode by ExtensionsTable.versionCode
+//    val lang by ExtensionsTable.lang
+//    val isNsfw by ExtensionsTable.isNsfw
+//}
\ No newline at end of file
diff --git a/webUI/react/src/components/ExtensionCard.tsx b/webUI/react/src/components/ExtensionCard.tsx
index 0b0a03c..d8005da 100644
--- a/webUI/react/src/components/ExtensionCard.tsx
+++ b/webUI/react/src/components/ExtensionCard.tsx
@@ -1,4 +1,4 @@
-import React from 'react';
+import React, { useState } from 'react';
 import { makeStyles } from '@material-ui/core/styles';
 import Card from '@material-ui/core/Card';
 import CardContent from '@material-ui/core/CardContent';
@@ -36,16 +36,24 @@ interface IProps {
     extension: IExtension
 }
 
-export default function ExtensionCard({
-    extension: {
-        name, lang, versionName, iconUrl,
-    },
-}: IProps) {
+export default function ExtensionCard(props: IProps) {
+    const {
+        extension: {
+            name, lang, versionName, iconUrl, installed, apkName,
+        },
+    } = props;
+    const [installedState, setInstalledState] = useState<string>((installed ? 'installed' : 'install'));
+
     const classes = useStyles();
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-    const bull = <span className={classes.bullet}>•</span>;
     const langPress = lang === 'all' ? 'All' : lang.toUpperCase();
 
+    function install() {
+        setInstalledState('installing');
+        fetch(`http://127.0.0.1:4567/api/v1/extensions/install/${apkName}`).then(() => {
+            setInstalledState('installed');
+        });
+    }
+
     return (
         <Card>
             <CardContent className={classes.root}>
@@ -68,7 +76,7 @@ export default function ExtensionCard({
                     </div>
                 </div>
 
-                <Button variant="outlined">install</Button>
+                <Button variant="outlined" onClick={() => install()}>{installedState}</Button>
             </CardContent>
         </Card>
     );
diff --git a/webUI/react/src/typings.d.ts b/webUI/react/src/typings.d.ts
index dcc4045..1a21c32 100644
--- a/webUI/react/src/typings.d.ts
+++ b/webUI/react/src/typings.d.ts
@@ -3,4 +3,6 @@ interface IExtension {
     lang: string
     versionName: string
     iconUrl: string
+    installed: boolean
+    apkName: string
 }