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NumRadar.app VS ZelNum

Compare NumRadar.app VS ZelNum and see what are their differences

NumRadar.app

Check whether phone numbers are registered on WhatsApp. Bulk uploads, REST API, MCP for AI agents, and a Chrome extension on one paid plan.

Rating
0 reviews
Pricing
Paid $9 / Monthly (5,000 validations)
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Alternatives Is it good?
ZelNum

Turn CSV/TXT lists into actionable segments with phone validation, carrier and HLR intelligence, messaging-app, social-account, and crypto-exchange checks, plus API workflows.

Rating
0 reviews
Pricing
Freemium $1 (10,000 WhatsApp number checks)
Promote on VibeVoted
Alternatives Is it good?
Thalam
OpenAI-compatible API gateway for GPT, Claude, Gemini, DeepSeek, Qwen, Kling and more. One key, one endpoint, one bill. Pay per token, no lock-in. sponsored

Which is more popular?

API Tools popularity
100% vs 0%
alternatives listed
2 vs 8

Base details

Website, pricing, platforms and company facts side by side.

NumRadar.app
ZelNum
Website numradar.app zelnum.com
Pricing
Paid $9 / Monthly (5,000 validations) Official pricing
Freemium $1 (10,000 WhatsApp number checks) Official pricing
Platforms
Web Google Chrome
Web REST API SaaS
Company 1 - 9 employees · 2026 2026
Listed in
Data Validation API Tools Lead Enrichment
Phone Number Validation Data Validation Data Enrichment WhatsApp +1

About NumRadar.app and ZelNum

In their own words, as submitted to SaaSHub.

NumRadar.app
ZelNum

NumRadar checks whether phone numbers are registered on WhatsApp, so you can choose the channel before a campaign or reminder goes out. Upload a CSV or Excel list and download the results, call the REST API from your own app, let an AI agent check numbers over MCP, or check the numbers on a web...

Read more about NumRadar.app

ZelNum is a self-service bulk verification and data-quality platform for phone intelligence, messaging apps, social and consumer accounts, and crypto exchanges. Upload CSV or TXT lists to check phone status, live activity, carrier and line type, HLR-style network signals, phone model, and...

Read more about ZelNum

Features and specs

What each product offers, as listed by its team.

NumRadar.app 7 features
ZelNum 11 features
  • Bulk file checks
    Upload a CSV or Excel list and download the results as CSV or JSON
  • REST API
    Check one number and get its WhatsApp status as JSON
  • MCP for AI agents
    Let an AI agent check numbers and run bulk jobs over MCP
  • Chrome extension
    Check the numbers on a web page
  • Definitive-answer billing
    Invalid and unknown numbers are free
  • No account to connect
    No WhatsApp number, Business account or Cloud API app to connect
  • Per-number details
    Business account, line type, country and a wa.me link per number
  • Bulk Phone Validation
    Validate, normalize and segment phone numbers from CSV or TXT files.
  • Messaging App Checks
    Check selected phone-number and account signals across WhatsApp, Telegram, Facebook, iMessage, RCS, Zalo, LINE, and Viber.
  • Carrier and HLR Lookup
    Identify carrier, country, line type, and HLR-style network signals.
  • Phone Status and Activity Checks。
    Identify active, inactive, risky, and recently active numbers where supported.
  • Social Account Checks
    Check phone- and email-based account signals across Instagram, TikTok, LinkedIn, Snapchat, Signal, BAND, Amazon, Apple ID, and Microsoft.
  • Crypto Exchange Account Checks
    Check supported phone and email account signals across Binance, KuCoin, CoinW, and HTX.
  • Email Account Checks
    Check email-based account signals across supported platforms and services.
  • Phone Model Detection
    Detect the phone brand and model associated with a mobile number where available.
  • List Cleaning and Segmentation
    Remove duplicate or invalid records and export structured result segments.
  • CSV/TXT Bulk Uploads
    Upload contact lists for batch verification, cleaning, and segmentation.
  • REST API Workflows
    Submit batch tasks, monitor processing status, retrieve results, and integrate verification into applications.

Analysis

An editorial look at what each product does well and who it suits.

NumRadar.app
ZelNum

No analysis of NumRadar.app yet.

Overall verdict

  • BulkChecker.io appears to be a bulk email/domain verification tool designed to help users validate large lists of email addresses to reduce bounce rates and improve deliverability, but as I don't have verified, up-to-date information on this specific service, I'd recommend researching current user reviews, checking recent uptime/accuracy reports, and testing with a small sample before committing to a larger plan.

Why this product is good

  • Bulk verification tools generally save time by processing large email lists quickly compared to manual checks
  • Such services typically help improve email deliverability by removing invalid or risky addresses before sending campaigns
  • May offer API access for integration into existing workflows or CRM systems
  • Often provide tiered pricing that can scale with list size, potentially cost-effective for growing needs

Recommended for

  • Email marketers needing to clean large subscriber lists before campaigns
  • Businesses looking to reduce bounce rates and protect sender reputation
  • Developers wanting API-based email validation integration
  • Users who should independently verify current pricing, accuracy rates, and customer support quality before relying on this specific service

Videos

Walkthroughs and reviews on video.

NumRadar.app 1 video + Add
ZelNum 0 videos + Add

NumRadar — WhatsApp Number Validation | Bulk, API, AI Agents & Chrome

No ZelNum videos yet. You could help us improve this page by suggesting one.

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
NumRadar.app
ZelNum
100% 100%
API Tools
0% 0%
35% 35%
Data Validation
65% 65%
0% 0%
WhatsApp
100% 100%
100% 100%
Lead Enrichment
0% 0%

Questions & Answers

As answered by people managing NumRadar.app and ZelNum.

Why should a person choose your product over its competitors?

NumRadar.app's answer

One plan and one API key cover bulk CSV or Excel uploads, a REST API, MCP for AI agents and a Chrome extension. You pay for definitive answers only. Bulk lists and their results are deleted 30 days after the job ends, and the billing record of a validation never includes the number.

ZelNum's answer:

ZelNum supports multiple verification types, usage-based pricing, downloadable result segments, and task-based API processing without requiring a subscription.

How would you describe the primary audience of your product?

NumRadar.app's answer

Marketing and operations owners who already hold phone lists, developers who want the check inside their own app, and sales or support staff who check numbers while browsing.

ZelNum's answer:

Marketing teams, CRM operators, developers, agencies, community managers, and businesses that need to clean or enrich large contact lists.

What makes your product unique?

NumRadar.app's answer

You get a definitive answer before you send, and you connect no WhatsApp number, Business account or Cloud API app. Registered and not registered each use one validation. Invalid numbers and lookups that could not finish cost nothing, and an unfinished lookup comes back as Unknown, never as not registered.

ZelNum's answer:

ZelNum combines phone validation, carrier lookup, WhatsApp and Telegram checks, and other account signals in one bulk CSV/TXT and API workflow.

Which are the primary technologies used for building your product?

NumRadar.app's answer

NumRadar runs on Google Cloud in europe-west1 (Belgium). It offers a REST API, a hosted MCP server over Streamable HTTP, an open-source MCP package on npm and a Manifest V3 Chrome extension.

What's the story behind your product?

NumRadar.app's answer

The WhatsApp API tells you a number is not registered when the send fails. By then the message is written and the schedule is set. NumRadar started in October 2026 as a bootstrapped side project to put that check before the send, for any team that has a phone list and needs to choose the channel.

User comments

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