NumberChecker vs Reletter

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

NumberChecker compared with Reletter
Detail	NumberChecker	Reletter
What it does	Bulk WhatsApp, phone and email verification without login or QR scan	Newsletter search engine and database for finding, contacting and getting featured in email newsletters
Stage	Established	Not given
Founded	Not given	Not given
Based in	Not given	US
Pricing model	Paid	Freemium
Pricing	WhatsApp Number Checker: $1 per 40,000 checks. WhatsApp Business Checker: $1.67 per 10,000 checks. WhatsApp Last Seen Checker: $3.39 per 10,000 checks. WhatsApp Age & Gender Checker: $11.76 per 10,000 checks. Number Status Detection: $4.26 per 10,000 checks. RCS Status Detection: $3.92 per 10,000 ch	Light: $49/mo (1 user, 100 searches/month, 3 lists); Standard: $99/mo (5 users, 500 searches/month, 50 lists); Business: $199/mo (10 users, unlimited searches and lists). API Access addon: $59/month (5,000 requests). All plans include 7-day free trial.
Key features	WhatsApp status verification without login or QR scan Phone number status detection for active, disconnected and ported numbers WhatsApp age and gender demographic estimation RCS and Google Messages capability detection iOS and iMessage status detection Telegram activity and status checking Gmail, Yahoo and Outlook email validation REST API for automation and integration Pay-as-you-go credits with no subscription Multiple checks stacked on single CSV upload	Search 7+ million newsletters by topic and niche Access subscriber numbers and traffic estimates AI integration through MCP connection Multi-user team accounts Team collaboration and list management
What makes it different	No WhatsApp login required, protecting user accounts from bans Lowest pricing: WhatsApp checks from $1 per 40,000 Thirteen different checks with mixed stacking on one upload Contact lists never sold and kept confidential Human account review before access to prevent abuse	Automates newsletter research and outreach at scale Covers newsletters from multiple platforms including Substack and LinkedIn Real-time mention tracking across newsletter ecosystem
Community votes	0	0
DR (Domain Rating by Ahrefs)	7 −1 (down) since last check	38 −1 (down) since last check
Trust Flow (Majestic)	3	10
Citation Flow (Majestic)	21	33
Referring domains (Majestic)	8	162

5 details filled in for both companies.

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