diff --git a/.eslintrc.js b/.eslintrc.js
index f1070507..4921e395 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -24,6 +24,7 @@ module.exports = {
   ],
 
   globals: {
+    fetch: true,
     window: true,
     document: true,
     describe: true,
diff --git a/packages/xod-client-browser/webpack.config.js b/packages/xod-client-browser/webpack.config.js
index 08ab974d..ccf37aa6 100644
--- a/packages/xod-client-browser/webpack.config.js
+++ b/packages/xod-client-browser/webpack.config.js
@@ -96,6 +96,7 @@ module.exports = {
       'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV || 'development'),
       'process.env.XOD_HM_DEF': JSON.stringify(process.env.XOD_HM_DEF || false),
 
+      'process.env.XOD_HOSTNAME': JSON.stringify(process.env.XOD_HOSTNAME || 'xod.io'),
       'process.env.XOD_SITE_DOMAIN': JSON.stringify(''),
       'process.env.XOD_FORUM_DOMAIN': JSON.stringify('https://forum.xod.io/'),
       'process.env.XOD_UTM_SOURCE': JSON.stringify('ide-browser'),
diff --git a/packages/xod-client-electron/src/upload/components/PopupUploadConfig.jsx b/packages/xod-client-electron/src/upload/components/PopupUploadConfig.jsx
index d339c05a..a783dd18 100644
--- a/packages/xod-client-electron/src/upload/components/PopupUploadConfig.jsx
+++ b/packages/xod-client-electron/src/upload/components/PopupUploadConfig.jsx
@@ -41,6 +41,7 @@ class PopupUploadConfig extends React.Component {
     this.getSelectedBoard()
       .then(selectedBoard => this.getBoards(selectedBoard));
     this.getPorts();
+    this.props.updateCompileLimit();
   }
 
   onClose() {
@@ -252,6 +253,7 @@ class PopupUploadConfig extends React.Component {
   render() {
     const boards = this.renderBoardSelect();
     const ports = this.renderPortSelect();
+    const compileLimitLeft = this.props.compileLimitLeft;
 
     return (
       <PopupForm
@@ -270,10 +272,14 @@ class PopupUploadConfig extends React.Component {
             id="compileInCloud"
             type="checkbox"
             checked={this.state.doCompileInCloud}
+            disabled={compileLimitLeft <= 0}
             onChange={this.onCloudCompilationChanged}
           />
           <label htmlFor="compileInCloud">
-            Compile in the cloud (experimental)
+            Compile in the cloud&nbsp;
+            {compileLimitLeft
+              ? <span>({compileLimitLeft} left)</span>
+              : <span>(currently offline)</span>}
           </label>
         </div>
         <div className="ModalContent">
@@ -300,6 +306,8 @@ class PopupUploadConfig extends React.Component {
 PopupUploadConfig.propTypes = {
   isVisible: PropTypes.bool,
   selectedPort: PropTypes.object,
+  compileLimitLeft: PropTypes.number,
+  updateCompileLimit: PropTypes.func,
   getSelectedBoard: PropTypes.func,
   listBoards: PropTypes.func,
   listPorts: PropTypes.func,
diff --git a/packages/xod-client-electron/src/view/containers/App.jsx b/packages/xod-client-electron/src/view/containers/App.jsx
index 9b2b455d..6ab68cda 100644
--- a/packages/xod-client-electron/src/view/containers/App.jsx
+++ b/packages/xod-client-electron/src/view/containers/App.jsx
@@ -227,6 +227,7 @@ class App extends client.App {
       }
       // Remove listener if process is finished.
       ipcRenderer.removeAllListeners(UPLOAD_TO_ARDUINO);
+      this.props.actions.updateCompileLimit();
     });
   }
 
@@ -549,6 +550,8 @@ class App extends client.App {
         selectedPort={this.props.selectedPort}
         listBoards={this.listBoards}
         listPorts={this.listPorts}
+        compileLimitLeft={this.props.compileLimitLeft}
+        updateCompileLimit={this.props.actions.updateCompileLimit}
         onBoardChanged={this.onArduinoTargetBoardChange}
         onPortChanged={this.onSerialPortChange}
         onUpload={this.onUploadToArduino}
@@ -658,6 +661,7 @@ App.propTypes = R.merge(client.App.propTypes, {
   project: client.sanctuaryPropType(Project),
   actions: PropTypes.objectOf(PropTypes.func),
   upload: PropTypes.object,
+  compileLimitLeft: PropTypes.number,
   workspace: PropTypes.string,
   selectedPort: PropTypes.object,
 });
@@ -674,6 +678,7 @@ const mapStateToProps = R.applySpec({
   saveProcess: getSaveProcess,
   currentPatchPath: client.getCurrentPatchPath,
   selectedPort: getSelectedSerialPort,
+  compileLimitLeft: client.getCompileLimitLeft,
   popups: {
     createProject: client.getPopupVisibility(client.POPUP_ID.CREATING_PROJECT),
     projectSelection: client.getPopupVisibility(client.POPUP_ID.OPENING_PROJECT),
diff --git a/packages/xod-client-electron/webpack.config.js b/packages/xod-client-electron/webpack.config.js
index c401f151..dbfef6f3 100644
--- a/packages/xod-client-electron/webpack.config.js
+++ b/packages/xod-client-electron/webpack.config.js
@@ -110,6 +110,7 @@ const options = {
       'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV || 'development'),
       'process.env.XOD_HM_DEF': JSON.stringify(process.env.XOD_HM_DEF || false),
 
+      'process.env.XOD_HOSTNAME': JSON.stringify(process.env.XOD_HOSTNAME || 'xod.io'),
       'process.env.XOD_SITE_DOMAIN': JSON.stringify('https://xod.io/'),
       'process.env.XOD_FORUM_DOMAIN': JSON.stringify('https://forum.xod.io/'),
       'process.env.XOD_UTM_SOURCE': JSON.stringify('ide-desktop'),
diff --git a/packages/xod-client/README.md b/packages/xod-client/README.md
index 4b13d8d3..74ae762b 100644
--- a/packages/xod-client/README.md
+++ b/packages/xod-client/README.md
@@ -35,3 +35,9 @@ is used. Reducers simply delegate state update to `xod-project`’s functions,
 selectors, and components use functions from `xod-project` to access project
 data. This distincion is done because project state is complex and keeping all
 machinery inside standard pod layout would make it messy.
+
+## Environment variables
+
+- **`XOD_HOSTNAME`**
+    
+    XOD hostname. Default: `xod.io`
diff --git a/packages/xod-client/package.json b/packages/xod-client/package.json
index 424283a3..83b9c45a 100644
--- a/packages/xod-client/package.json
+++ b/packages/xod-client/package.json
@@ -23,6 +23,7 @@
     "font-awesome": "^4.6.3",
     "formsy-react": "^0.18.1",
     "formsy-react-components": "^0.8.1",
+    "isomorphic-fetch": "^2.2.1",
     "prop-types": "^15.5.10",
     "ramda": "^0.24.1",
     "ramda-fantasy": "^0.7.0",
diff --git a/packages/xod-client/src/core/actions.js b/packages/xod-client/src/core/actions.js
index 702763c5..d4aedd0c 100644
--- a/packages/xod-client/src/core/actions.js
+++ b/packages/xod-client/src/core/actions.js
@@ -22,6 +22,7 @@ export const showCode = code => ({
   payload: { code },
 });
 
+export * from '../user/actions';
 export * from '../editor/actions';
 export * from '../project/actions';
 export * from '../projectBrowser/actions';
diff --git a/packages/xod-client/src/core/containers/App.jsx b/packages/xod-client/src/core/containers/App.jsx
index f5ad7b91..a63e465d 100644
--- a/packages/xod-client/src/core/containers/App.jsx
+++ b/packages/xod-client/src/core/containers/App.jsx
@@ -29,6 +29,7 @@ export default class App extends React.Component {
     document.addEventListener('cut', this.props.actions.cutEntities);
     document.addEventListener('copy', this.props.actions.copyEntities);
     document.addEventListener('paste', this.props.actions.pasteEntities);
+    this.props.actions.updateCompileLimit();
   }
 
   onShowCodeArduino() {
@@ -128,6 +129,7 @@ App.propTypes = {
   popups: PropTypes.objectOf(PropTypes.bool),
   popupsData: PropTypes.objectOf(PropTypes.object),
   actions: PropTypes.shape({
+    updateCompileLimit: PropTypes.func.isRequired,
     createProject: PropTypes.func.isRequired,
     updateProjectMeta: PropTypes.func.isRequired,
     hideAllPopups: PropTypes.func.isRequired,
@@ -163,6 +165,7 @@ App.propTypes = {
 };
 
 App.actions = {
+  updateCompileLimit: actions.updateCompileLimit,
   createProject: actions.createProject,
   requestCreateProject: actions.requestCreateProject,
   requestRenameProject: actions.requestRenameProject,
diff --git a/packages/xod-client/src/core/reducer.js b/packages/xod-client/src/core/reducer.js
index 117c38f9..31953536 100644
--- a/packages/xod-client/src/core/reducer.js
+++ b/packages/xod-client/src/core/reducer.js
@@ -1,6 +1,7 @@
 import { merge } from 'ramda';
 import { combineReducers } from 'redux';
 
+import userReducer from '../user/reducer';
 import projectReducer from '../project/reducer';
 import undoableProject from './undoableProject';
 import projectBrowserReducer from '../projectBrowser/reducer';
@@ -15,6 +16,7 @@ import keepIntegrityAfterNavigatingHistory from './keepIntegrityAfterNavigatingH
 const combineRootReducers = (extraReducers) => {
   const reducers = merge(
     {
+      user: userReducer,
       project: projectReducer,
       projectHistory: (s = {}) => s,
       projectBrowser: projectBrowserReducer,
diff --git a/packages/xod-client/src/core/selectors.js b/packages/xod-client/src/core/selectors.js
index 0d59fdf5..14bb56f5 100644
--- a/packages/xod-client/src/core/selectors.js
+++ b/packages/xod-client/src/core/selectors.js
@@ -4,6 +4,7 @@ import { createSelector } from 'reselect';
 
 import * as XP from 'xod-project';
 
+import * as User from '../user/selectors';
 import * as Editor from '../editor/selectors';
 import * as Project from '../project/selectors';
 import * as ProjectBrowser from '../projectBrowser/selectors';
@@ -70,6 +71,7 @@ export const getPatchForHelpbar = createSelector(
 
 
 export default {
+  User,
   Editor,
   Errors,
   Processes,
diff --git a/packages/xod-client/src/core/state.js b/packages/xod-client/src/core/state.js
index a685f754..72cdabf4 100644
--- a/packages/xod-client/src/core/state.js
+++ b/packages/xod-client/src/core/state.js
@@ -1,9 +1,11 @@
+import userState from '../user/state';
 import editorState from '../editor/state';
 import projectState from '../project/state';
 import debuggerState from '../debugger/state';
 import projectBrowserState from '../projectBrowser/state';
 
 export default {
+  user: userState,
   project: projectState,
   projectHistory: {},
   projectBrowser: projectBrowserState,
diff --git a/packages/xod-client/src/editor/components/NodeInspector.jsx b/packages/xod-client/src/editor/components/NodeInspector.jsx
index 45924a01..34e3e78d 100644
--- a/packages/xod-client/src/editor/components/NodeInspector.jsx
+++ b/packages/xod-client/src/editor/components/NodeInspector.jsx
@@ -14,7 +14,7 @@ import Widgets, { WIDGET_MAPPING } from './inspectorWidgets';
 
 import { RenderableNode } from '../../types';
 import sanctuaryPropType from '../../utils/sanctuaryPropType';
-import { getUtmSiteUrl } from '../../utils/siteLinks';
+import { getUtmSiteUrl } from '../../utils/urls';
 
 import * as MESSAGES from '../messages';
 
diff --git a/packages/xod-client/src/index.js b/packages/xod-client/src/index.js
index b932dd81..f6e56779 100644
--- a/packages/xod-client/src/index.js
+++ b/packages/xod-client/src/index.js
@@ -1,3 +1,4 @@
+import * as UserSelectors from './user/selectors';
 import * as EditorSelectors from './editor/selectors';
 import * as UtilsSelectors from './utils/selectors';
 import * as ProcessSelectors from './processes/selectors';
@@ -22,7 +23,7 @@ import * as PopupConstants from './popups/constants';
 
 import popupsReducer, { showOnlyPopup, hideOnePopup } from './popups/reducer';
 
-import * as siteLinkUtils from './utils/siteLinks';
+import * as siteLinkUtils from './utils/urls';
 import * as BrowserUtils from './utils/browser';
 import * as MenuUtils from './utils/menu';
 import sanctuaryPropType from './utils/sanctuaryPropType';
@@ -63,7 +64,7 @@ export * from './debugger/selectors';
 
 export * from './utils/browser';
 export * from './utils/constants';
-export * from './utils/siteLinks';
+export * from './utils/urls';
 export * from './popups/constants';
 export { lowercaseKebabMask } from './utils/inputFormatting';
 export { default as sanctuaryPropType } from './utils/sanctuaryPropType';
@@ -109,6 +110,7 @@ export default Object.assign({
   PopupProjectPreferences,
   TAB_CLOSE,
 },
+  UserSelectors,
   UtilsSelectors,
   EditorSelectors,
   ProcessSelectors,
diff --git a/packages/xod-client/src/projectBrowser/containers/ProjectBrowser.jsx b/packages/xod-client/src/projectBrowser/containers/ProjectBrowser.jsx
index 7123a66f..786406ad 100644
--- a/packages/xod-client/src/projectBrowser/containers/ProjectBrowser.jsx
+++ b/packages/xod-client/src/projectBrowser/containers/ProjectBrowser.jsx
@@ -36,7 +36,7 @@ import PatchTypeSelector from '../components/PatchTypeSelector';
 import ProjectBrowserPopups from '../components/ProjectBrowserPopups';
 import ProjectBrowserToolbar from '../components/ProjectBrowserToolbar';
 
-import { getUtmSiteUrl } from '../../utils/siteLinks';
+import { getUtmSiteUrl } from '../../utils/urls';
 import { IconGuide } from '../../utils/components/IconGuide';
 
 const PATCH_TYPE = {
diff --git a/packages/xod-client/src/user/actionTypes.js b/packages/xod-client/src/user/actionTypes.js
new file mode 100644
index 00000000..475553ea
--- /dev/null
+++ b/packages/xod-client/src/user/actionTypes.js
@@ -0,0 +1,2 @@
+export const UPDATE_COMPILE_LIMIT = 'UPDATE_COMPILE_LIMIT';
+export default {};
diff --git a/packages/xod-client/src/user/actions.js b/packages/xod-client/src/user/actions.js
new file mode 100644
index 00000000..f9797ed4
--- /dev/null
+++ b/packages/xod-client/src/user/actions.js
@@ -0,0 +1,12 @@
+import { getCompileLimitUrl } from '../utils/urls';
+import { UPDATE_COMPILE_LIMIT } from './actionTypes';
+
+export const updateCompileLimit = () => dispatch =>
+  fetch(getCompileLimitUrl())
+    .then(res => (res.ok ? res.json() : null))
+    .catch(() => null)
+    .then(limit => dispatch({
+      type: UPDATE_COMPILE_LIMIT,
+      payload: limit,
+    }));
+export default {};
diff --git a/packages/xod-client/src/user/reducer.js b/packages/xod-client/src/user/reducer.js
new file mode 100644
index 00000000..9b73b456
--- /dev/null
+++ b/packages/xod-client/src/user/reducer.js
@@ -0,0 +1,14 @@
+import { UPDATE_COMPILE_LIMIT } from './actionTypes';
+
+const userReducer = (state = {}, action) => {
+  switch (action.type) {
+    case UPDATE_COMPILE_LIMIT: {
+      const limit = action.payload;
+      return { ...state, limit };
+    }
+    default:
+      return state;
+  }
+};
+
+export default userReducer;
diff --git a/packages/xod-client/src/user/selectors.js b/packages/xod-client/src/user/selectors.js
new file mode 100644
index 00000000..152103d8
--- /dev/null
+++ b/packages/xod-client/src/user/selectors.js
@@ -0,0 +1,14 @@
+import R from 'ramda';
+import { createSelector } from 'reselect';
+
+export const getUserState = R.prop('user');
+
+export const getCompileLimit = createSelector(
+  getUserState,
+  R.prop('limit')
+);
+
+export const getCompileLimitLeft = createSelector(
+  getCompileLimit,
+  limit => (limit ? limit.limit - limit.pending - limit.used : null)
+);
diff --git a/packages/xod-client/src/user/state.js b/packages/xod-client/src/user/state.js
new file mode 100644
index 00000000..92948718
--- /dev/null
+++ b/packages/xod-client/src/user/state.js
@@ -0,0 +1,3 @@
+export default {
+  limit: null,
+};
diff --git a/packages/xod-client/src/utils/siteLinks.js b/packages/xod-client/src/utils/urls.js
similarity index 86%
rename from packages/xod-client/src/utils/siteLinks.js
rename to packages/xod-client/src/utils/urls.js
index c34f0911..93c51eee 100644
--- a/packages/xod-client/src/utils/siteLinks.js
+++ b/packages/xod-client/src/utils/urls.js
@@ -29,3 +29,9 @@ export const getUtmSiteUrl = getUtmUrl(process.env.XOD_SITE_DOMAIN);
  */
 // :: String -> String
 export const getUtmForumUrl = getUtmUrl(process.env.XOD_FORUM_DOMAIN, '', 'forum');
+
+const HOSTNAME = process.env.XOD_HOSTNAME || 'xod.io';
+
+// :: String -> String
+export const getCompileLimitUrl = () =>
+  `https://compile.${HOSTNAME}/limits`;
diff --git a/yarn.lock b/yarn.lock
index 6d7bbbbe..3e8e4602 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5778,7 +5778,7 @@ isobject@^3.0.0, isobject@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/isobject/-/isobject-3.0.1.tgz#4e431e92b11a9731636aa1f9c8d1ccbcfdab78df"
 
-isomorphic-fetch@2.2.1, isomorphic-fetch@^2.1.1:
+isomorphic-fetch@2.2.1, isomorphic-fetch@^2.1.1, isomorphic-fetch@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/isomorphic-fetch/-/isomorphic-fetch-2.2.1.tgz#611ae1acf14f5e81f729507472819fe9733558a9"
   dependencies: