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Postman vs ZelNum
Postman is an API testing tool, not a phone or messaging verification service.
PostmanAPI platform for designing, testing and documenting APIs
ZelNumVerify phone & email in bulk online or via API — WhatsApp, Telegram, Binance.Which to pick
Pick Postman if you want…
- Full-stack API lifecycle platform
- API design & testing
Pick ZelNum if you want…
- Bulk phone & messaging verification
- Open-source code (zelnum/zelnum-python on GitHub, MIT license)
Side by side
- What it is
- Postman:Postman is an API platform for designing, testing, documenting, and monitoring APIs.
- ZelNum:ZelNum verifies WhatsApp, Telegram, phone and social platform numbers and provides carrier, risk and activity signals.
- Best for
- Postman:Full-stack API lifecycle platform
- ZelNum:Bulk phone & messaging verification
- Who it’s for
- Postman:Developers and teams building, testing, and managing APIs.
- ZelNum:Teams that need to clean contact lists, run campaigns, or verify user accounts.
- Pricing
- Postman:Freemium
- ZelNum:Pay as you go
- Plans
- Postman:Free $0 · Solo $9 per month (billed annually) · Team $19 per user/month (billed annuall
- ZelNum:WhatsApp Number Checker $0.5 per 10K lookups · Telegram Number Checker $1.5 per 10K lookups · Phone Validation $4 per 10K lookups
- Open source
- Postman:—
- ZelNum:Yes, 0 GitHub stars
- Works with
- Postman:VS Code, Git, AWS, Postman CLI, Postman API
- ZelNum:—
Postman features
- API design & discovery. Create, version, and explore APIs with the Context Graph and API discovery tools.
- Automated testing. Generate collections, run automated tests, and perform performance testing with unlimited runners.
- Mock servers. Spin up mock servers to simulate APIs before they exist.
- API monitoring. Monitor live endpoints for uptime, drift, and performance metrics.
- CI/CD integration. Run collection and governance checks on every commit via Postman CLI and integrations.
ZelNum features
- Real-time & bulk checks. Validate WhatsApp, Telegram and phone numbers instantly or via CSV/TXT uploads.
- Carrier & line-type lookup. Add carrier, line type and routing signals to each number.
- Risk & activity signals. Get registration status, account age, online presence and VoIP risk indicators.
- API integration. Automate single lookups or batch jobs through REST endpoints.
- Multi-platform coverage. Supports 40+ platforms including social apps and crypto exchanges.
- Exportable results. Download cleaned segments (valid, inactive, risky) for CRM or marketing use.
Postman vs ZelNum FAQ
Is Postman or ZelNum free?+
Postman has a free plan; paid plans start at $9/month (Solo).
Is Postman or ZelNum open source?+
ZelNum is open source (zelnum/zelnum-python on GitHub, MIT license). DevHunt has no public source repository on record for Postman.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.