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TheDualWeb helps teams check whether authorized contact numbers are available on WhatsApp before reaching out.

Features:

• Pair an authorized WhatsApp device using a time-limited QR code.
• Enter authorized phone numbers directly.
• Select a local TXT or single-column CSV file containing one number per line.
• Review availability results inside the extension.
• Disconnect the paired session at any time.

Submitted numbers are sent to TheDualWeb's first-party API only when you start a check. Selected files are read and validated locally; file contents and file names are not uploaded.

Pairing and session credentials are stored in Firefox local extension storage so the authorized connection can continue across extension openings. Number lists and results are not stored persistently by the extension.

Only check numbers you own or have permission to contact.

TheDualWeb is not affiliated with, endorsed by, or sponsored by WhatsApp or Meta.