ZelNum verifies WhatsApp, Telegram, and phone numbers in real time or in bulk. Its 58 check tools (45 phone, 13 email) validate carrier data, flag VoIP and risky records, and clean account lists via a no-code dashboard or API. Start with free tools and $1 trial credit, then scale with pay-as-you-go pricing for large datasets.
• 58 check tools (45 phone + 13 email) covering WhatsApp, Telegram, and major platforms
• Bulk CSV list cleaning and realtime single-lookup API
• Carrier and line-type detection (VoIP / virtual / landline) with risky-record flagging
• No-code dashboard plus REST API for developers
• $1 free trial credit with pay-as-you-go pricing
• Clean CRM and marketing lists before campaigns to cut bounces and protect sender reputation
• Verify numbers at signup to block fake accounts and fraud
• Check WhatsApp / Telegram reachability before cold outreach
• Screen and validate customer contact databases in bulk
6 ratings
$1 free trial credit for new users — no credit card required
Visit deal
AI video with native sound, paid per clip. Nothing stored.
A calmer Mac menu bar, one click away.
Enterprise Software. Intelligent Automation. Global Impact.
Comments
2We ran cold outreach campaigns for years, and the frustrating part was never the rejection. It was paying to message numbers that turned out to be dead, VoIP, or never on WhatsApp at all. ZelNum started as an internal cleanup script. It got out of hand and became 58 checks (45 phone, 13 email), a bulk CSV cleaner, and a realtime API. New accounts get $1 in trial credit, enough to run your own list through it before spending a cent. Ask me anything about carrier lookups, VoIP detection, or why so many subscriber lists are 30% ghosts.
Building small web tools and browser extensions from Reykjavík, Iceland. Made Loupe, a free accessibility checker that explains every WCAG fix.
Congrats on the launch, Yang! Starting from your own outreach script is a good sign, since you clearly felt the pain first. How does it handle numbers that recently switched carriers? Does the result update quickly?