How Wassuply works: your computer, the cloud and WhatsApp Web

What is Wassuply, in plain words?#

Wassuply is a desktop app for Windows and Mac that opens WhatsApp Web once for each of your numbers and drives those sessions for warm-up and campaigns. It is not a cloud service that holds your numbers: the WhatsApp sessions, your contacts and your campaigns live on your computer, and Wassuply's cloud handles your account, your plan and the features that need a server.

Because it works through WhatsApp Web, you link a number exactly as you would link WhatsApp Web, by scanning a QR code from Linked devices on your phone. Normal WhatsApp and WhatsApp Business numbers both work. Wassuply is independent software and is not the official WhatsApp Business Platform.

What runs and is stored on your computer?#

Everything that touches your numbers and your contacts runs and is stored on your computer. That includes:

• WhatsApp sessions: one separate browser session per number, holding its WhatsApp Web login.
• Your work: accounts, contacts, lists, templates, campaigns, sequences, warm-up sessions and their history.
• Replies: incoming replies captured for opt-out detection, kept for 365 days.
• Activity logs: cleared after 7 days by default and capped at the newest 10,000 entries.
• Settings and keys: your Settings, your AI provider key and your ElevenLabs key.
• All sending: pacing, daily caps, blackout hours and Smart Send decisions are made on your computer.

On a Mac, the app's sign-in session is stored encrypted using your macOS login Keychain. Removing a number with Remove Account deletes its session from your computer.

What uses Wassuply's cloud?#

Wassuply's cloud is used for your account, your plan and a small set of features that need a server. Contacts, campaigns and message history are not uploaded for any of these.

Pod partners are other Wassuply users, so the numbers you add to a pod are shared with the numbers they pair with. See Warm-up Network.

How are your numbers kept separate?#

Every number runs in its own browser session with its own cookies and storage, so numbers never share a login and do not have to be logged out to switch. On top of that, each number can have:

• Its own browser fingerprint: screen size, graphics card strings, canvas and audio noise, CPU cores, timezone and a browser version that tracks the real engine. The operating system in the fingerprint always matches your computer, so a Mac never claims to be Windows.
• Its own proxy: SOCKS5 (recommended), SOCKS4, HTTP or HTTPS. Call traffic is kept on the proxy too, and the proxy check flags any number that is connecting from your real IP. See Proxies.
• Its own limits: a per-number daily cap, falling back to the global cap of 80 messages a day.

Without proxies, all your numbers share your internet connection's IP address. Running many numbers also costs memory, which is why only the 5 most recently used sessions stay loaded by default. Raise Warm Pool Size in Settings if a warm-up or campaign uses more numbers than that.

How does sending through WhatsApp Web work?#

Wassuply sends a message by opening the recipient's chat in that number's WhatsApp Web session, filling the message box, checking it, and pressing send. For cold outreach it opens chats through WhatsApp's own New chat panel, which reaches numbers you have never saved or messaged.

• Checked before sending: the message box must contain exactly your text. If it is empty or different after two tries, Wassuply sends nothing and logs an error.
• One job per number: a number that is sending a campaign is not used for warm-up at the same time, and a scheduled campaign waits until its numbers are free.
• Skips instead of guessing: if the right chat cannot be opened, that contact is skipped rather than risking a message to the wrong chat.
• Paced: random gaps, batches and caps apply. See Sending safety.

Wassuply records that a message was sent. It does not confirm delivery on its own: by default, delivered and read ticks are only read when you run a receipt check on a campaign.

What happens when you go offline or close the app?#

If your internet drops, Wassuply keeps your plan for up to 14 days from its last successful check, then pauses sending until it can check again. When the connection returns, it reloads every WhatsApp session about 5 seconds later so they reconnect.

• Closing on Windows: Wassuply disconnects each session cleanly (you see Disconnecting accounts safely...). With Close button hides to tray on, it keeps running in the tray instead.
• Closing on a Mac: the red button hides the window and campaigns keep running. Quit with Cmd+Q.
• Next launch: interrupted campaigns resume automatically about 15 seconds after start. Warm-up sessions only resume if Auto-resume warmup sessions on launch is on.
• Signed out or deauthorised: sending locks as soon as the app learns of it (within about a minute for a deauthorised device), even mid-campaign.

How can you limit what Wassuply shows and stores?#

Use Settings → Privacy to control what appears on screen and what is recorded. These switches change display and storage only; they do not affect sending.

Stealth Mode

Stops activity logging, hides phone numbers and blocks exports while it is on. It also keeps Wassuply out of the Windows taskbar or the Mac Dock.

Blur phone numbers

Shows numbers as ••••••1234 in the interface.

Disable all data export

Blocks CSV and file exports of contacts, logs and lists.

Clear Activity Logs

Deletes the activity history on this computer.

Each number's WhatsApp view also has its own Privacy Mode controls for the WhatsApp Web screen itself. See WhatsApp accounts.

Frequently asked questions#