diff --git a/packages/server/src/api/controllers/application.js b/packages/server/src/api/controllers/application.js
index 9bd015c86a..0eb7818032 100644
--- a/packages/server/src/api/controllers/application.js
+++ b/packages/server/src/api/controllers/application.js
@@ -11,7 +11,7 @@ const { exec } = require("child_process")
 const sqrl = require("squirrelly")
 
 exports.fetch = async function(ctx) {
-  const db = new CouchDB(ClientDb.name(env.CLIENT_ID))
+  const db = new CouchDB(ClientDb.name(getClientId(ctx)))
   const body = await db.query("client/by_type", {
     include_docs: true,
     key: ["app"],
@@ -21,16 +21,30 @@ exports.fetch = async function(ctx) {
 }
 
 exports.fetchAppPackage = async function(ctx) {
-  const db = new CouchDB(ClientDb.name(env.CLIENT_ID))
+  const clientId = await lookupClientId(ctx.params.applicationId)
+  const db = new CouchDB(ClientDb.name(clientId))
   const application = await db.get(ctx.params.applicationId)
   ctx.body = await getPackageForBuilder(ctx.config, application)
 }
 
 exports.create = async function(ctx) {
-  const db = new CouchDB(ClientDb.name(env.CLIENT_ID))
+  const clientId =
+    (ctx.request.body && ctx.request.body.clientId) || env.CLIENT_ID
+
+  if (!clientId) {
+    ctx.throw(400, "ClientId not suplied")
+  }
+  const appId = newid()
+  // insert an appId -> clientId lookup
+  const masterDb = new CouchDB("master")
+  await masterDb.put({
+    _id: appId,
+    clientId,
+  })
+  const db = new CouchDB(ClientDb.name(clientId))
 
   const newApplication = {
-    _id: newid(),
+    _id: appId,
     type: "app",
     instances: [],
     userInstanceMap: {},
@@ -47,11 +61,10 @@ exports.create = async function(ctx) {
 
   const createInstCtx = {
     params: {
-      clientId: env.CLIENT_ID,
       applicationId: newApplication._id,
     },
     request: {
-      body: { name: `dev-${env.CLIENT_ID}` },
+      body: { name: `dev-${clientId}` },
     },
   }
   await instanceController.create(createInstCtx)
@@ -61,6 +74,7 @@ exports.create = async function(ctx) {
     await runNpmInstall(newAppFolder)
   }
 
+  ctx.status = 200
   ctx.body = newApplication
   ctx.message = `Application ${ctx.request.body.name} created successfully`
 }
@@ -79,7 +93,6 @@ const createEmptyAppPackage = async (ctx, app) => {
 
   if (await exists(newAppFolder)) {
     ctx.throw(400, "App folder already exists for this application")
-    return
   }
 
   await copy(templateFolder, newAppFolder)
@@ -99,6 +112,24 @@ const createEmptyAppPackage = async (ctx, app) => {
   return newAppFolder
 }
 
+const lookupClientId = async appId => {
+  const masterDb = new CouchDB("master")
+  const { clientId } = await masterDb.get(appId)
+  return clientId
+}
+
+const getClientId = ctx => {
+  const clientId =
+    (ctx.request.body && ctx.request.body.clientId) ||
+    (ctx.query && ctx.query.clientId) ||
+    env.CLIENT_ID
+
+  if (!clientId) {
+    ctx.throw(400, "ClientId not suplied")
+  }
+  return clientId
+}
+
 const updateJsonFile = async (filePath, app) => {
   const json = await readFile(filePath, "utf8")
   const newJson = sqrl.Render(json, app)
diff --git a/packages/server/src/api/controllers/auth.js b/packages/server/src/api/controllers/auth.js
index de88c29643..f083d57ba6 100644
--- a/packages/server/src/api/controllers/auth.js
+++ b/packages/server/src/api/controllers/auth.js
@@ -2,7 +2,6 @@ const jwt = require("jsonwebtoken")
 const CouchDB = require("../../db")
 const ClientDb = require("../../db/clientDb")
 const bcrypt = require("../../utilities/bcrypt")
-const env = require("../../environment")
 
 exports.authenticate = async ctx => {
   const { username, password } = ctx.request.body
@@ -10,8 +9,14 @@ exports.authenticate = async ctx => {
   if (!username) ctx.throw(400, "Username Required.")
   if (!password) ctx.throw(400, "Password Required")
 
+  const masterDb = new CouchDB("master")
+  const { clientId } = await masterDb.get(ctx.params.appId)
+
+  if (!clientId) {
+    ctx.throw(400, "ClientId not suplied")
+  }
   // find the instance that the user is associated with
-  const db = new CouchDB(ClientDb.name(env.CLIENT_ID))
+  const db = new CouchDB(ClientDb.name(clientId))
   const appId = ctx.params.appId
   const app = await db.get(appId)
   const instanceId = app.userInstanceMap[username]
diff --git a/packages/server/src/api/controllers/client.js b/packages/server/src/api/controllers/client.js
index 433bf58c3b..400ccde358 100644
--- a/packages/server/src/api/controllers/client.js
+++ b/packages/server/src/api/controllers/client.js
@@ -6,13 +6,26 @@ exports.getClientId = async function(ctx) {
 }
 
 exports.create = async function(ctx) {
-  await create(env.CLIENT_ID)
+  const clientId = getClientId(ctx)
+  await create(clientId)
   ctx.status = 200
-  ctx.message = `Client Database ${env.CLIENT_ID} successfully provisioned.`
+  ctx.message = `Client Database ${clientId} successfully provisioned.`
 }
 
 exports.destroy = async function(ctx) {
-  await destroy(env.CLIENT_ID)
+  const clientId = getClientId(ctx)
+  await destroy(clientId)
   ctx.status = 200
-  ctx.message = `Client Database ${env.CLIENT_ID} successfully deleted.`
+  ctx.message = `Client Database ${clientId} successfully deleted.`
+}
+
+const getClientId = ctx => {
+  const clientId =
+    (ctx.query && ctx.query.clientId) ||
+    (ctx.body && ctx.body.clientId) ||
+    env.CLIENT_ID
+  if (!clientId) {
+    ctx.throw(400, "ClientId not suplied")
+  }
+  return clientId
 }
diff --git a/packages/server/src/api/controllers/component.js b/packages/server/src/api/controllers/component.js
index 0b07826555..eedd3a8ceb 100644
--- a/packages/server/src/api/controllers/component.js
+++ b/packages/server/src/api/controllers/component.js
@@ -8,7 +8,9 @@ const {
 const env = require("../../environment")
 
 exports.fetchAppComponentDefinitions = async function(ctx) {
-  const db = new CouchDB(ClientDb.name(env.CLIENT_ID))
+  const masterDb = new CouchDB("master")
+  const { clientId } = await masterDb.get(ctx.params.appId)
+  const db = new CouchDB(ClientDb.name(clientId))
   const app = await db.get(ctx.params.appId)
 
   const componentDefinitions = app.componentLibraries.reduce(
diff --git a/packages/server/src/api/controllers/instance.js b/packages/server/src/api/controllers/instance.js
index fe40cf9fb4..d8f6a07888 100644
--- a/packages/server/src/api/controllers/instance.js
+++ b/packages/server/src/api/controllers/instance.js
@@ -8,7 +8,10 @@ exports.create = async function(ctx) {
   const appShortId = ctx.params.applicationId.substring(0, 7)
   const instanceId = `inst_${appShortId}_${newid()}`
   const { applicationId } = ctx.params
-  const clientId = env.CLIENT_ID
+
+  const masterDb = new CouchDB("master")
+  const { clientId } = await masterDb.get(applicationId)
+
   const db = new CouchDB(instanceId)
   await db.put({
     _id: "_design/database",
diff --git a/packages/server/src/api/controllers/user.js b/packages/server/src/api/controllers/user.js
index 5810872989..d529619843 100644
--- a/packages/server/src/api/controllers/user.js
+++ b/packages/server/src/api/controllers/user.js
@@ -42,8 +42,11 @@ exports.create = async function(ctx) {
 
   const response = await database.post(user)
 
+  const masterDb = new CouchDB("master")
+  const { clientId } = await masterDb.get(appId)
+
   // the clientDB needs to store a map of users against the app
-  const db = new CouchDB(clientDb.name(env.CLIENT_ID))
+  const db = new CouchDB(clientDb.name(clientId))
   const app = await db.get(appId)
 
   app.userInstanceMap = {
diff --git a/packages/server/src/api/routes/tests/application.spec.js b/packages/server/src/api/routes/tests/application.spec.js
index 4c193613fd..7f64419778 100644
--- a/packages/server/src/api/routes/tests/application.spec.js
+++ b/packages/server/src/api/routes/tests/application.spec.js
@@ -5,6 +5,7 @@ const {
   destroyClientDatabase,
   builderEndpointShouldBlockNormalUsers,
   supertest,
+  TEST_CLIENT_ID,
   defaultHeaders,
 } = require("./couchTestUtils")
 
@@ -51,6 +52,7 @@ describe("/applications", () => {
         body: { name: "My App" }
       })
     })
+
   })
 
   describe("fetch", () => {
@@ -68,6 +70,37 @@ describe("/applications", () => {
       expect(res.body.length).toBe(2)
     })
 
+    it("lists only applications in requested client databse", async () => {
+      await createApplication(request, "app1")
+      await createClientDatabase("new_client")
+
+      const blah = await request
+        .post("/api/applications")
+        .send({ name: "app2", clientId: "new_client"})
+        .set(defaultHeaders)
+        .expect('Content-Type', /json/)
+        //.expect(200)
+
+      const client1Res = await request
+        .get(`/api/applications?clientId=${TEST_CLIENT_ID}`)
+        .set(defaultHeaders)
+        .expect('Content-Type', /json/)
+        .expect(200)
+      
+      expect(client1Res.body.length).toBe(1)
+      expect(client1Res.body[0].name).toBe("app1")
+
+      const client2Res = await request
+        .get(`/api/applications?clientId=new_client`)
+        .set(defaultHeaders)
+        .expect('Content-Type', /json/)
+        .expect(200)
+      
+      expect(client2Res.body.length).toBe(1)
+      expect(client2Res.body[0].name).toBe("app2")
+
+    })
+
     it("should apply authorization to endpoint", async () => {
       const otherApplication = await createApplication(request) 
       const instance = await createInstance(request, otherApplication._id)
diff --git a/packages/server/src/api/routes/tests/couchTestUtils.js b/packages/server/src/api/routes/tests/couchTestUtils.js
index f70fc0ced1..6029e080cc 100644
--- a/packages/server/src/api/routes/tests/couchTestUtils.js
+++ b/packages/server/src/api/routes/tests/couchTestUtils.js
@@ -9,6 +9,7 @@ const {
 
 const TEST_CLIENT_ID = "test-client-id"
 
+exports.TEST_CLIENT_ID = TEST_CLIENT_ID
 exports.supertest = async () => {
   let request
   let port = 4002
@@ -59,7 +60,7 @@ exports.createView = async (request, instanceId, view) => {
   return res.body
 }
 
-exports.createClientDatabase = async () => await create(TEST_CLIENT_ID)
+exports.createClientDatabase = async id => await create(id || TEST_CLIENT_ID)
 
 exports.createApplication = async (request, name = "test_application") => {
   const res = await request