Smartlead vs KX21

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

Smartlead compared with KX21
Detail	Smartlead	KX21
What it does	Cold Email Software for Sales Teams That Run Outbound at Scale	The Platform People
Stage	Established	Not given
Founded	Not given	Not given
Based in	Not given	US
Pricing model	Freemium	Not given
Pricing	Free trial available with no credit card required. Paid plans start at $39/month (Base) and go up to $379/month (Unlimited Prime). Annual billing saves 17% across all plans. Add-ons available for SmartSenders, SmartDelivery, SmartDialer, Email Verification, and SmartServers.	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	Unlimited mailboxes AI-powered email warmup Deliverability infrastructure Unified Master Inbox AI agents for GTM automation Integrated CRM Email verification White-label platform	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	Unlimited mailboxes included in all plans at no extra cost Dedicated deliverability infrastructure optimized for cold email Unified master inbox for entire revenue cycle management AI agents that automate full sales cycle without coding	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 +1 (up) since last check	5 +1 (up) since last check
Trust Flow (Majestic)	35	6
Citation Flow (Majestic)	57	26
Referring domains (Majestic)	7770	15

4 details filled in for both companies.

More alternatives to Smartlead More alternatives to KX21