Desktop, browser, or phone: where should a CEO use AI?

The surface is just the window. Your account is the home.

You have three ways to open Claude: the browser, a desktop app, and your phone. They all show the same chats. They all pull from the same account. What differs is what each surface lets you do and how fast it gets out of your way.

The short answer: browser or desktop app for deep work at your desk, phone for capture and review between meetings. The rest of this explains why, and what actually follows you between devices versus what stays put.

If you are still getting oriented with Claude itself, start with the first 30 minutes setup before worrying about which surface to use. Surface choice matters after you have a real use case. Not before.

Web browser: the default deep-work surface

Open claude.ai in any browser. Nothing to install. Works on any machine you happen to be on. This is the baseline.

The browser gets you the full feature set. Projects, file upload, long documents, cloud connectors, all of it. Anything that takes more than a few minutes at your desk lives here by default. The reason to start here is that everything else layers on top of it: if a feature exists, you can count on it being in the browser first.

What you give up is ergonomics. A browser tab competes with every other tab you have open. Switching to it takes a beat longer than a native app. For a quick question between tasks, that friction adds up.

For anything longer than a few minutes, you probably will not notice.

Desktop app: the browser plus local reach

The Mac and Windows apps are the same account, the same chats, the same Projects. Everything syncs. For pure chat, writing, and research, the desktop app is functionally identical to the browser.

The reason to install it is local file and tool access. The desktop app can connect to files and tools on your own machine in ways the browser cannot. If you want Claude to read a file sitting on your hard drive, reference something in a local folder, or connect to tools running locally, the desktop app is the surface for that. The browser cannot reach your machine's filesystem.

The other reason is ergonomics. A dedicated app runs lighter than a browser with thirty-seven tabs. Most desktop apps give you a fast way to summon Claude without switching windows, which matters when you are using it constantly throughout the day.

One thing that does NOT follow you to other devices: the local connections. Your laptop's files are on your laptop. The desktop app's local reach is desktop-only by design. When you pick up your phone, that piece stays behind.

Everything else, your chats, Projects, memory, account settings, follows you everywhere.

Mobile app: capture and review between meetings

The phone app is not where you do the heavy lifting. It is where you do everything else.

Best for voice input. You can speak a question, a thought, a draft, and have it transcribed and answered while you are walking to a meeting. That alone is worth having the app installed. The gap between a thought and a written artifact used to require sitting down.

Also strong for: quick questions, reviewing a document that was handed back to you, phone-native tasks like drafting a message or checking on a summary, and capturing context while it is fresh.

Weaker for: long documents, side-by-side work where you are comparing the AI output against a spreadsheet or a deck, anything requiring file handling.

You can open and continue your existing Projects on mobile. Setting a new Project up, uploading files, loading a full document, those tasks are easier on the web first. Mobile is where you use the thing you built on your desk.

Treat it as capture-and-review. Not deep work.

What syncs across all three

Your account, your chat history, your Projects, and whatever memory and persistent context you have set up. Start a thread in the browser, glance at it on your phone, finish it in the desktop app. It is all one continuous thing.

The one carve-out: local file and tool connections from the desktop app stay on that machine. That is not a sync gap, it is a design boundary. Your phone does not have access to your laptop's files, and neither does any cloud surface.

If you are deciding which AI brand fits your setup, this sync behavior is roughly consistent across the major providers. All of them tie your account to a web, desktop, and mobile surface with similar portability.

The decision rule

One line:

• Browser or desktop app when you are at your desk with real work in front of you. Use the desktop app specifically when you want AI to reach local files or tools on that machine. Otherwise, the two are interchangeable.
• Phone for voice input, quick questions, and reviewing output between meetings.

The session is portable. The surface is just the window.

Some of the local-reach and advanced file features sit behind paid tiers on most platforms. If you are comparing free versus paid options, the breakdown is here.

Start where you are

If you are reading this on your laptop right now, open the browser. Set up your first Project and run a real task. That is the foundation everything else connects to.

The app and the phone will make sense once you have a use case they fit. Build the use case first.