diff --git a/core/application.mjs b/core/application.mjs
index a1acc36..a7b5d5c 100644
--- a/core/application.mjs
+++ b/core/application.mjs
@@ -1,5 +1,69 @@
+import { EventEmitter } from 'events'
+import fs from 'fs/promises'
+
 export default class Application extends EventEmitter {
-  constructor() {
-    
+  constructor(util, db, provider, name, opts = {}) {
+    super()
+    this.util = util
+    this.db = db
+    this.config = db.config[name]
+    this.provider = provider
+    this.name = name
+    this.updating = false
+
+    Object.assign(this, {
+      setInterval: opts.setInterval || setInterval,
+    })
+
+    this.db.addApplication(name)
+  }
+
+  startAutoupdater() {
+    let timer = this.setInterval(() => {
+      this.update().then(
+        () => {
+          this.db.data.core[this.name].updater += 'Automatic update finished successfully. '
+        },
+        (err) => {
+          this.db.data.core[this.name].updater += 'Error while running automatic update: ' + err.message + '. '
+        }
+      )
+    }, (this.config.updateEvery || 180) * 60 * 1000)
+    timer.unref()
+  }
+
+  updateLog(message) {
+    this.db.data.core[this.name].updater += message
+    this.db.log.info(message)
+  }
+
+  async update() {
+    if (this.updating) return
+
+    this.updating = true
+    this.db.data.core[this.name].updater = ''
+
+    try {
+      this.updateLog(`Checking for latest version at ${new Date().toISOString().replace('T', ' ').split('.')[0]}. `)
+
+      let latest = await this.provider.getLatestVersion()
+
+      this.updateLog(`Found ${latest.version}. `)
+
+      if (this.db.data.core[this.name].latestInstalled === latest.version) {
+        this.updateLog('Already up to date, nothing to do. ')
+        return
+      }
+
+      let target = this.util.getPathFromRoot(`./${this.name}/${latest.version}/file${this.util.getExtension(latest.filename)}`)
+
+      await fs.mkdir(this.util.getPathFromRoot(`./${this.name}/${latest.version}`), { recursive: true })
+
+      this.updateLog(`Downloading ${latest.link} to ${target}. `)
+      await this.provider.downloadVersion(latest, target)
+    } catch (err) {
+      this.updating = false
+      return Promise.reject(err)
+    }
   }
 }
\ No newline at end of file
diff --git a/core/db.mjs b/core/db.mjs
index 7cbb47e..40506f6 100644
--- a/core/db.mjs
+++ b/core/db.mjs
@@ -1,10 +1,14 @@
-import { Low, JSONFile } from 'lowdb'
+import { Low, JSONFile, Memory } from 'lowdb'
 import { type } from 'os'
 import { defaults, isObject } from './defaults.mjs'
 
-export default function GetDB(config, util, log, filename = 'db.json') {
-  let fullpath = util.getPathFromRoot('./' + filename)
-  const adapter = new JSONFile(fullpath)
+export default function GetDB(config, log, orgFilename = 'db.json') {
+  let adapter = new Memory()
+  let fullpath = 'in-memory'
+  if (orgFilename) {
+    fullpath = orgFilename
+    adapter = new JSONFile(fullpath)
+  }
   const db = new Low(adapter)
 
   db.id = 'id'
@@ -70,14 +74,17 @@ export default function GetDB(config, util, log, filename = 'db.json') {
       active: null,
       latestInstalled: null,
       latestVersion: null,
+      updater: '',
       versions: [],
     })
   }
 
+  db.log = log
+
   return db.read()
     .then(function() {
       if (!isObject(db.data)) {
-        log.warn(`File ${fullpath} was empty or not a json object, clearing it.`)
+        db.log.warn(`File ${fullpath} was empty or not a json object, clearing it.`)
         db.data = {}
       }
       defaults(db.data, { core: { version: 1 } })
@@ -92,33 +99,4 @@ export default function GetDB(config, util, log, filename = 'db.json') {
         throw wrapped
       }
     )
-
-    /*
-  const adapter = new FileAsync(util.getPathFromRoot('./' + filename))
-
-  return lowdb(adapter)
-    .then(function(db) {
-      db._.mixin(lodashId)
-      db.adapterFilePath = util.getPathFromRoot('./' + filename)
-
-      return db.defaults({
-        core: {
-          "appActive": null, // Current active running
-          "appLatestInstalled": null, // Latest installed version
-          "appLatestVersion": null, // Newest version available
-          "manageActive": null,
-          "manageLatestInstalled": null,
-          "manageLatestVersion": null
-        },
-        core_appHistory: [],
-        core_manageHistory: [],
-        core_version: 1,
-      })
-      .write()
-      .then(
-        function() { return db },
-        function() { throw new Error('Error writing defaults to lowdb'); }
-      )
-    })
-    */
 }
diff --git a/core/updater.mjs b/core/updater.mjs
deleted file mode 100644
index e69de29..0000000
diff --git a/package.json b/package.json
index 2b45406..24ff247 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "main": "lib.mjs",
   "scripts": {
     "dev": "nodemon --watch dev/api --watch core --watch runner.mjs --watch db.mjs --watch log.mjs runner.mjs | bunyan",
-    "test": "eltro 'test/**/*.test.mjs' -r dot",
+    "test": "eltro \"test/**/*.test.mjs\" -r dot",
     "test:watch": "npm-watch test"
   },
   "watch": {
diff --git a/test/application.test.mjs b/test/application.test.mjs
new file mode 100644
index 0000000..ed5cd39
--- /dev/null
+++ b/test/application.test.mjs
@@ -0,0 +1,269 @@
+import { setTimeout, setImmediate } from 'timers/promises'
+import { Eltro as t, assert, stub } from 'eltro'
+import fs from 'fs/promises'
+import lowdb from '../core/db.mjs'
+import Application from '../core/application.mjs'
+import Util from '../core/util.mjs'
+
+const util = new Util(import.meta.url)
+
+var logger = {
+  info: stub(),
+  warn: stub(),
+  error: stub(),
+}
+function createProvider() {
+  return {
+    getLatestVersion: stub(),
+    downloadVersion: stub(),
+  }
+}
+
+t.describe('constructor()', function() {
+  let db
+
+  t.beforeEach(function() {
+    return lowdb({ test: { } }, logger, null).then(function(res) {
+      db = res
+    })
+  })
+
+  t.test('should auto-create application', function() {
+    assert.notOk(db.data.core.test)
+
+    new Application(util, db, {}, 'test')
+
+    assert.ok(db.data.core.test)
+    assert.ok(db.data.core.test.versions)
+    assert.strictEqual(db.data.core.test.active, null)
+    assert.strictEqual(db.data.core.test.latestInstalled, null)
+    assert.strictEqual(db.data.core.test.latestVersion, null)
+  })
+
+  t.test('should keep config and other of itself', function() {
+    const assertTest = { a: 1 }
+    const assertName = 'test'
+    db.config = {
+      test: assertTest,
+      app: { b: 2},
+      manage: { c: 3 },
+    }
+
+    let app = new Application(util, db, {}, assertName)
+    assert.strictEqual(app.config, assertTest)
+    assert.strictEqual(app.db, db)
+    assert.strictEqual(app.util, util)
+    assert.strictEqual(app.name, assertName)
+  })
+
+  t.test('should keep provider', function() {
+    const assertProvider = { a: 1 }
+    let app = new Application(util, db, assertProvider, 'test')
+    assert.strictEqual(app.provider, assertProvider)
+  })
+})
+
+t.timeout(250).describe('#startAutoupdater()', function() {
+  let db
+
+  t.beforeEach(function() {
+    return lowdb({ test: { }, testapp: { } }, logger, null).then(function(res) {
+      db = res
+    })
+  })
+
+  t.test('should call setInterval correctly', function() {
+    const assertTimeMinutes = 1440
+    const stubInterval = stub()
+    const stubUnref = stub()
+    stubInterval.returns({ unref: stubUnref })
+
+    db.config.test.updateEvery = assertTimeMinutes
+
+    let app = new Application(util, db, {}, 'test', { setInterval: stubInterval })
+
+    assert.strictEqual(stubInterval.called, false)
+    assert.strictEqual(stubUnref.called, false)
+
+    app.startAutoupdater()
+    
+    assert.strictEqual(stubInterval.called, true)
+    assert.strictEqual(stubUnref.called, true)
+    assert.strictEqual(typeof(stubInterval.firstCall[0]), 'function')
+    assert.strictEqual(stubInterval.firstCall[1], assertTimeMinutes * 60 * 1000)
+  })
+
+  t.test('should support default value if updateEvery is not defined', function() {
+    const stubInterval = stub()
+    stubInterval.returns({ unref: function() {} })
+
+    let app = new Application(util, db, {}, 'test', { setInterval: stubInterval })
+
+    assert.strictEqual(stubInterval.called, false)
+
+    app.startAutoupdater()
+    
+    assert.strictEqual(stubInterval.called, true)
+    assert.strictEqual(typeof(stubInterval.firstCall[0]), 'function')
+    assert.strictEqual(stubInterval.firstCall[1], 3 * 60 * 60 * 1000)
+  })
+
+  t.test('should call update as promise correctly', async function() {
+    const stubUpdate = stub()
+    const stubInterval = stub()
+    stubInterval.returns({ unref: function() {} })
+
+    stubUpdate.returnWith(function() {
+      return Promise.resolve()
+    })
+
+    let app = new Application(util, db, {}, 'test', { setInterval: stubInterval })
+    app.update = stubUpdate
+    app.startAutoupdater()
+
+    assert.strictEqual(typeof(stubInterval.firstCall[0]), 'function')
+    assert.notStrictEqual(stubInterval.firstCall, stubUpdate)
+
+    stubInterval.firstCall[0]()
+
+    while (db.data.core.test.updater === '') {
+      await setTimeout(10)
+    }
+
+    assert.match(db.data.core.test.updater, /auto/i)
+    assert.match(db.data.core.test.updater, /update/i)
+  })
+
+  t.test('should add any errors to last in db update check on errors when updating', async function() {
+    const stubInterval = stub()
+    const assertErrorMessage = 'Ai Do'
+    stubInterval.returns({ unref: function() {} })
+
+    let app = new Application(util, db, {}, 'test', { setInterval: stubInterval })
+    app.update = function() {
+      return Promise.reject(new Error(assertErrorMessage))
+    }
+    app.startAutoupdater()
+
+    assert.strictEqual(db.data.core.test.updater, '')
+
+    stubInterval.firstCall[0]()
+
+    while (db.data.core.test.updater === '') {
+      await setTimeout(10)
+    }
+
+    assert.match(db.data.core.test.updater, /auto/i)
+    assert.match(db.data.core.test.updater, /update/i)
+    assert.match(db.data.core.test.updater, new RegExp(assertErrorMessage))
+  })
+})
+
+t.timeout(250).describe('#update()', function() {
+  let db
+  let app
+  let provider
+
+  t.beforeEach(function() {
+    return lowdb({ test: { } }, logger, null).then(function(res) {
+      db = res
+      provider = createProvider()
+      app = new Application(util, db, provider, 'testapp')
+    })
+  })
+
+  t.afterEach(function() {
+    return fs.rm('./test/testapp/123456789', { force: true, recursive: true })
+  })
+
+  t.test('multiple calls should be safe', async function() {
+    db.data.core.testapp.updater = ''
+
+    provider.getLatestVersion.returnWith(function() {
+      return new Promise(function() {})
+    })
+
+    assert.strictEqual(app.updating, false)
+
+    app.update()
+    await setImmediate()
+
+    assert.strictEqual(app.updating, true)
+    assert.strictEqual(provider.getLatestVersion.callCount, 1)
+
+    app.update()
+    await setImmediate()
+    
+    assert.strictEqual(provider.getLatestVersion.callCount, 1)
+  })
+
+  t.test('should check for latest version', async function() {
+    const assertError = new Error('Ore wa Subete wo Shihaisuru')
+    provider.getLatestVersion.rejects(assertError)
+    db.data.core.testapp.updater = ''
+
+    let err = await assert.isRejected(app.update())
+    assert.strictEqual(err, assertError)
+    assert.strictEqual(app.updating, false)
+
+    assert.match(db.data.core.testapp.updater, /check/i)
+    assert.match(db.data.core.testapp.updater, /version/i)
+    assert.match(db.data.core.testapp.updater, new RegExp(new Date().toISOString().split('T')[0]))
+  })
+
+  t.test('should call provider download latest correctly if new version', async function() {
+    const assertError = new Error('Without a fight')
+    const assertLink = 'All of you'
+    const assertVersion = { version: '123456789', link: assertLink, filename: 'test.7z' }
+    const assertTarget = util.getPathFromRoot('./testapp/123456789/file.7z')
+
+    await assert.isFulfilled(fs.stat('./test/testapp'))
+    await assert.isRejected(fs.stat('./test/testapp/123456789'))
+
+    provider.getLatestVersion.resolves(assertVersion)
+    provider.downloadVersion.rejects(assertError)
+    db.data.core.testapp.updater = ''
+
+    let err = await assert.isRejected(app.update())
+    assert.strictEqual(err, assertError)
+    assert.strictEqual(app.updating, false)
+
+    assert.match(db.data.core.testapp.updater, /found/i)
+    assert.match(db.data.core.testapp.updater, new RegExp(assertVersion.version))
+    assert.match(db.data.core.testapp.updater, /downloading/i)
+    assert.match(db.data.core.testapp.updater, new RegExp(assertLink))
+    assert.match(db.data.core.testapp.updater, new RegExp(assertTarget.replace(/\\/g, '\\\\')))
+    assert.strictEqual(provider.downloadVersion.firstCall[0], assertVersion)
+    assert.strictEqual(provider.downloadVersion.firstCall[1], assertTarget)
+    
+    await fs.stat('./test/testapp/123456789')
+  })
+  
+  t.test('should do nothing if latestInstalled matches version', async function() {
+    const assertError = new Error('should not be seen')
+    const assertVersion = { version: '999.888.777.666', filename: 'test.7z' }
+    provider.getLatestVersion.resolves(assertVersion)
+    provider.downloadVersion.rejects(assertError)
+    db.data.core.testapp.updater = ''
+    db.data.core.testapp.latestInstalled = assertVersion.version
+
+    await app.update()
+    assert.notOk(provider.downloadVersion.called)
+    assert.match(db.data.core.testapp.updater, /already/i)
+    assert.match(db.data.core.testapp.updater, /nothing/i)
+  })
+
+  t.test('should do nothing if version is found in versions', async function() {
+    const assertError = new Error('should not be seen')
+    const assertVersion = { version: '999.888.777.666', filename: 'test.7z' }
+    provider.getLatestVersion.resolves(assertVersion)
+    provider.downloadVersion.rejects(assertError)
+    db.data.core.testapp.updater = ''
+    db.data.core.testapp.latestInstalled = assertVersion.version
+
+    await app.update()
+    assert.notOk(provider.downloadVersion.called)
+    assert.match(db.data.core.testapp.updater, /already/i)
+    assert.match(db.data.core.testapp.updater, /nothing/i)
+  })
+})
diff --git a/test/db.test.mjs b/test/db.test.mjs
index f7f85ee..2e5e721 100644
--- a/test/db.test.mjs
+++ b/test/db.test.mjs
@@ -11,19 +11,23 @@ var logger = {
 }
 
 t.before(function() {
-  return fs.rm('./test/db_test.json')
-    .catch(function() {})
+  return Promise.all([
+    fs.rm('./test/db_test.json', { force: true }),
+    fs.rm('./test/null', { force: true }),
+  ])
 })
 
 t.afterEach(function() {
-  return fs.rm('./test/db_test.json')
-    .catch(function() { })
+  return Promise.all([
+    fs.rm('./test/db_test.json', { force: true }),
+    fs.rm('./test/null', { force: true }),
+  ])
 })
 
 t.test('Should auto create file with some defaults', async function() {
   await assert.isRejected(fs.stat('./test/db_test.json'))
 
-  let db = await lowdb({}, util, logger, 'db_test.json')
+  let db = await lowdb({}, logger, util.getPathFromRoot('./db_test.json'))
 
   let stat = await fs.stat('./test/db_test.json')
   assert.ok(stat.size > 0)
@@ -34,10 +38,25 @@ t.test('Should auto create file with some defaults', async function() {
   assert.notOk(db.data.core.manager)
 })
 
+t.test('Should support in-memory db', async function() {
+  await assert.isRejected(fs.stat('./test/db_test.json'))
+  await assert.isRejected(fs.stat('./test/null'))
+
+  let db = await lowdb({}, logger, null)
+
+  await assert.isRejected(fs.stat('./test/db_test.json'))
+  await assert.isRejected(fs.stat('./test/null'))
+
+  assert.ok(db.data.core)
+  assert.ok(db.data.core.version)
+  assert.notOk(db.data.core.app)
+  assert.notOk(db.data.core.manager)
+})
+
 t.test('Should map config to config', async function() {
   const assertConfig = { a: 1 }
 
-  let db = await lowdb(assertConfig, util, logger, 'db_test.json')
+  let db = await lowdb(assertConfig, logger, util.getPathFromRoot('./db_test.json'))
 
   assert.strictEqual(db.config, assertConfig)
 })
@@ -46,7 +65,7 @@ t.test('Should apply defaults to existing file', async function() {
   await assert.isRejected(fs.stat('./test/db_test.json'))
   await fs.writeFile('./test/db_test.json', '{"test":true}')
 
-  let db = await lowdb({}, util, logger, 'db_test.json')
+  let db = await lowdb({}, logger, util.getPathFromRoot('./db_test.json'))
 
   let stat = await fs.stat('./test/db_test.json')
   assert.ok(stat.size > 0)
@@ -63,7 +82,7 @@ t.test('Should not fail if db is invalid', async function() {
   await assert.isRejected(fs.stat('./test/db_test.json'))
   await fs.writeFile('./test/db_test.json', '[]')
 
-  let db = await lowdb({}, util, logger, 'db_test.json')
+  let db = await lowdb({}, logger, util.getPathFromRoot('./db_test.json'))
 
   let stat = await fs.stat('./test/db_test.json')
   assert.ok(stat.size > 0)
@@ -77,10 +96,15 @@ t.test('Should not fail if db is invalid', async function() {
   assert.match(logger.warn.firstCall[0], /clear/i)
 })
 
+t.test('Should attach logger to log', async function() {
+  let db = await lowdb({}, logger, util.getPathFromRoot('./db_test.json'))
+  assert.strictEqual(db.log, logger)
+})
+
 t.test('Should support adding an application with defaults', async function() {
   await assert.isRejected(fs.stat('./test/db_test.json'))
 
-  let db = await lowdb({}, util, logger, 'db_test.json')
+  let db = await lowdb({}, logger, util.getPathFromRoot('./db_test.json'))
 
   let stat = await fs.stat('./test/db_test.json')
   assert.ok(stat.size > 0)
@@ -113,7 +137,7 @@ t.test('Should support reading from db', async function() {
   const assertValue = { a: 1 }
   await assert.isRejected(fs.stat('./test/db_test.json'))
 
-  let db = await lowdb({}, util, logger, 'db_test.json')
+  let db = await lowdb({}, logger, util.getPathFromRoot('./db_test.json'))
 
 
   db.data.test = assertValue
@@ -121,20 +145,20 @@ t.test('Should support reading from db', async function() {
 
   assert.strictEqual(db.data.test, assertValue)
 
-  let dbSecondary = await lowdb({}, util, logger, 'db_test.json')
+  let dbSecondary = await lowdb({}, logger, util.getPathFromRoot('./db_test.json'))
   assert.notStrictEqual(dbSecondary.data.test, assertValue)
   assert.deepStrictEqual(dbSecondary.data.test, assertValue)
 })
 
 t.test('should throw if unable to write to file', function() {
-  return assert.isRejected(lowdb({}, util, logger, '../test'))
+  return assert.isRejected(lowdb({}, logger, '../test'))
 })
 
 t.test('should have basic database-like functions defined', async function() {
   const assertItem1 = { a: 1 }
   const assertItem2 = { a: 2 }
   const assertItem3 = { a: 3 }
-  let db = await lowdb({}, util, logger, 'db_test.json')
+  let db = await lowdb({}, logger, util.getPathFromRoot('./db_test.json'))
   assert.strictEqual(db.id, 'id')
 
   db.data.myarr = []
@@ -152,7 +176,7 @@ t.test('should have basic database-like functions defined', async function() {
 
   await db.write()
 
-  let dbSec = await lowdb({}, util, logger, 'db_test.json')
+  let dbSec = await lowdb({}, logger, util.getPathFromRoot('./db_test.json'))
   
   assert.strictEqual(dbSec.data.myarr.length, 2)
   assert.notStrictEqual(dbSec.get(dbSec.data.myarr, assertItem1.id), assertItem1)
@@ -193,7 +217,7 @@ t.test('should have basic database-like functions with string-like name of colle
   const assertItem1 = { a: 1 }
   const assertItem2 = { a: 2 }
   const assertItem3 = { a: 3 }
-  let db = await lowdb({}, util, logger, 'db_test.json')
+  let db = await lowdb({}, logger, util.getPathFromRoot('./db_test.json'))
   assert.strictEqual(db.id, 'id')
 
   db.data.myarr = []
@@ -211,7 +235,7 @@ t.test('should have basic database-like functions with string-like name of colle
 
   await db.write()
 
-  let dbSec = await lowdb({}, util, logger, 'db_test.json')
+  let dbSec = await lowdb({}, logger, util.getPathFromRoot('./db_test.json'))
   
   assert.strictEqual(dbSec.data.myarr.length, 2)
   assert.notStrictEqual(dbSec.get('myarr', assertItem1.id), assertItem1)