NumRadar vs heysteff SDK

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

NumRadar compared with heysteff SDK
Detail	NumRadar	heysteff SDK
What it does	WhatsApp number verification for developers	Official TypeScript SDK for sending messages, managing files and templates, with retries and webhook verification
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Paid	Not given
Pricing	Not given	Not given
Key features	WhatsApp number validation Bulk CSV validation REST API MCP server for AI agents Chrome extension	Send messages across WhatsApp Cloud and other channels Upload and manage media files Template support with parameters Automatic retries with exponential backoff Webhook signature verification Pagination with cursor support Detailed error handling with fix suggestions No dependencies, uses native Fetch API Access to all heysteff API endpoints
What makes it different	All-in-one platform with API, bulk uploads, AI agent integration, and browser extension Monthly billing cycles with no charges for failed lookups	Works across Node 20+, Deno, Bun and Cloudflare Workers with no dependencies Built-in idempotency prevents duplicate messages and payments across system restarts Automatic retry logic with growing delays and Retry-After header support Webhook verification with timestamp validation Full TypeScript types for API integration
Community votes	0	0
DR (Domain Rating by Ahrefs)	8 +1 (up) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	0	0
Referring domains (Majestic)	1	0

3 details filled in for both companies.