Reply.io vs KX21

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

Reply.io compared with KX21
Detail	Reply.io	KX21
What it does	AI-powered sales outreach and cold email platform for automating multichannel campaigns and booking more meetings	The Platform People
Stage	Established	Not given
Founded	2014	Not given
Based in	US	US
Pricing model	Freemium	Not given
Pricing	Free plan available; email automation plans start at $49/month per user (1,000 active contacts) for individual users. Multichannel plans start at $89/month per user billed annually. Jason AI SDR agent starts at $500/month. Agencies can use Agency Core starting at $210/month or Agency AI SDR at $500/	Kapture: $0.001 per recording, $0.005 per completed form, $15/month for unlimited e-signatures, 2,000 free tokens to start. Komms: $0.08 per minute including phone call, $15/month per phone number, 625 free minutes to start. KontrolX: 50% off current bill, base rate from $2,500/month, no per-lead fe
Key features	Email automation with unlimited mailboxes and email warm-up Multichannel conditional sequences across email, LinkedIn, SMS, WhatsApp, and calls AI-generated personalized email sequences Real-time B2B database with 1+ billion contacts and intent signals Automated meeting scheduling from sequences Unified inbox for managing all conversations LinkedIn automation for connection requests and messaging Jason AI SDR agent for autonomous outreach API and MCP integration for custom workflows	Lead recording and session replay at $0.001 per recording E-signatures with $15/month unlimited access Form building and lead capture with Kapture SIP routing on customer-owned carrier 100+ MCP tools for Claude and AI clients
What makes it different	Jason AI SDR agent automates entire sales cycle from prospect research to follow-up Email warm-up and deliverability management included with every mailbox 98% email deliverability rate with anti-spam and multi-channel support Works with AI tools like Claude, Cursor, and other MCP clients via terminal Access to 1+ billion B2B contacts with real-time hiring and technographic intent signals	Transparent pricing with no vendor markup: phone, storage and data companies bill customers directly 50% savings on lead routing and call tracking compared to current vendors Customer data ownership with no export fees or seat charges Built for AI with 100+ MCP tools for Claude All features available in every plan with usage-based pricing only
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	78 no change since last check	5 +1 (up) since last check
Trust Flow (Majestic)	31	6
Citation Flow (Majestic)	55	26
Referring domains (Majestic)	8077	15

5 details filled in for both companies.

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