Reply.io vs Certainly
Explore the showdown between Reply.io vs Certainly and find out which AI Sales tool wins. We analyze upvotes, features, reviews, pricing, alternatives, and more.
In a face-off between Reply.io and Certainly, which one takes the crown?
When we contrast Reply.io with Certainly, both of which are exceptional AI-operated sales tools, and place them side by side, we can spot several crucial similarities and divergences. The upvote count favors Reply.io, making it the clear winner. The number of upvotes for Reply.io stands at 118, and for Certainly it's 6.
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Reply.io
What is Reply.io?
Reply.io lets sales teams build multichannel outbound from one workspace: prospect from a B2B database of 1+ billion contacts, run conditional email and LinkedIn steps, and manage replies from a unified inbox. The product also sells mailboxes with built-in warmup so you can buy domains, connect inboxes, and start sending without juggling separate deliverability tools.
Where many sequencers stop at email templates, Reply.io layers an optional Jason AI SDR agent that researches prospects, writes personalized copy, handles replies, and books meetings on autopilot or in approval mode. Reply.io also exposes an API and MCP integration so you can launch outbound from Claude, Cursor, or Codex without opening the dashboard. That terminal-first angle is unusual for a category dominated by browser-only campaign builders.
Reply.io fits outbound sales reps, SDR teams, and agencies running cold email at volume. Common workflows include list building from intent signals, multichannel nurture sequences, and agency client workspaces with role-based access. The Agency Core plan at $210 per month supports multiple client workspaces under one agency account.
Certainly
What is Certainly?
Certainly deploys autonomous AI agents that handle customer conversations across web chat, WhatsApp, Instagram, SMS, email, and voice. Instead of scripted decision trees, the agents reason about goals, call tools in your stack, and resolve tickets end to end. The platform connects to Shopify, Zendesk, Salesforce, Gorgias, and 200-plus AI models with automatic failover.
Traditional chatbots break when customers go off-script. Certainly pairs agentic AI with implementation support from Copenhagen, where the company has operated since 2017. Customers like Feastables, Quad Lock, and Fintiba report containment rates above 40% and measurable revenue impact from post-chat purchases.
E-commerce brands, CX teams, and sales organizations use Certainly for customer support, conversational commerce, and internal ops. Starter plans begin at 500 euros per month with conversation-based billing and a 3-month pilot option.
Reply.io Upvotes
Certainly Upvotes
Reply.io Top Features
Search 1+ billion B2B contacts with 50 live data credits per month and intent signals like hiring activity or LinkedIn engagement
Buy Google or Microsoft mailboxes inside Reply.io with automatic SPF, DKIM, and DMARC setup plus peer-to-peer warmup included
Run conditional sequences across email, LinkedIn, WhatsApp, SMS, and calls from one workflow with a unified inbox
Jason AI SDR researches prospects, personalizes outreach in 50+ languages, and books meetings from $500 per month
Connect HubSpot, Salesforce, Zapier, and MCP clients like Claude Code or Cursor for API-driven outbound
Multichannel plan includes 10 email mailboxes and unlimited active contacts from $89 per user monthly when billed annually
Certainly Top Features
Supports web, WhatsApp, Instagram, Facebook, SMS, email, and voice from one agent
Native integrations with Shopify, Zendesk, Salesforce, Gorgias, and Freshdesk
Switch between Claude, GPT, Gemini, and 200+ OpenRouter models without rebuilding
Starter plan from 500 euros per month with conversation-based billing
99.9% uptime SLA with GDPR-compliant EU data storage
G2 rating of 4.8 with 1,000+ agents deployed worldwide
Reply.io Category
- Sales
Certainly Category
- Sales
Reply.io Pricing Type
- Freemium
Certainly Pricing Type
- Paid