eTrader is one account on every screen. The terminal in the browser, the Mac app and the Android app all sign in with the same broker login, and they show the same positions, orders, drawings and alerts. Pick the one that fits the screen in front of you. Nothing is lost by switching.
The browser terminal
terminal.etraderweb.com is the full terminal with nothing to install. It runs in Safari, Chrome, Edge and Firefox, on a desktop or a phone, and it holds every feature: the chart with its indicators and drawings, the order ticket, orders on the chart, up to four charts per screen, market depth, the take profit ladder, price alerts, history export, the Files menu for your own indicators and bots, and the account settings.
On Windows, Linux and ChromeOS, Chrome and Edge show an Install Web App button on the home page and in the terminal. It puts eTrader in your app list with its own window and icon, still with no download. On a phone, Safari's Share menu and Chrome's menu both offer Add to Home Screen, which does the same thing.
Mac
The Mac app is a native app, downloaded from the eTrader home page. Open the disk image, drag eTrader to Applications, and open it. The first launch asks you to choose your broker and sign in, exactly as the web does.
What the Mac adds over the browser is the window. Charts detach into their own windows, so a four chart layout can spread across two screens. Menus sit in the menu bar. History exports to a CSV file you choose the location for. The app follows the system appearance, light or dark, and switches when the system does.
The eTrader Code and eTrader AI apps for Mac download from the same page. Each is separate from the terminal, and each signs in with your eTrader ID rather than a broker login.
Android
The Android app downloads from the eTrader home page as an installer file. Open it on the phone and Android asks you to allow installs from your browser, once. Accept, and the install runs. Sign in with your broker, server, account number and password, or open a demo.
The phone layout is built for one hand: a tab bar for Market Watch, the chart, Trading and your account, a full screen chart when the phone turns sideways, and a trade ticket that slides up from the bottom. Stop loss and take profit drag on the chart with a finger. The drawing tools and indicators are the same as the web, with the settings in sheets.
Push notifications arrive on the phone for fills, stops, targets, closes and price alerts. Each category has its own switch in Settings, so you can keep the alerts and drop the rest.
iPhone
The iPhone app is on its way to the App Store. Until it lands, the browser terminal in Safari does the job: open terminal.etraderweb.com, sign in, and choose Add to Home Screen from the Share menu. The icon opens the terminal full screen with the phone layout, and it remembers your sign in.
One account, every device
Everything you do belongs to the trading account, not to the device. Open a position on the phone on the way in and it is on the Mac when you sit down. Draw a level on the Mac and it is on the phone chart. Change a stop loss anywhere and every screen redraws it. Indicators, chart colours, the column layout of the positions table and your alerts all travel the same way.
The terminal also lets you hold more than one trading account at once. Connect Another Account, in the Accounts sheet, adds a second login, from the same broker or a different one, and you switch between them from the same place. The Accounts sheet shows the balance and equity of each, and Sign out this account removes one without touching the others.
Staying signed in
The sign in sheet has Keep Me Signed In ticked by default, so the app opens straight to your charts. Untick it on a shared computer. To sign out on any device, open the account menu and choose Sign out. A demo account you opened yourself can also be deleted from Settings, together with its balance, positions and history.
Which one to use
At a desk, the Mac app or the browser terminal. Both take a four chart layout and a second screen. On the move, the Android app or the terminal on an iPhone's Home Screen. And when you are on someone else's computer, the browser terminal with Keep Me Signed In unticked. They are the same terminal, so nothing you learn in one is wasted in another.