Voice-Native AI SDR Platform Harmony Calls Leads Under 60 Seconds

August 31, 2026 at 22:10 PM EDT

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A new ranking of AI SDR software puts voice performance, not email volume, at the center of the outbound sales category for 2026.

Harmony leads a new AI SDR software ranking, running outbound calls on its own sub-400ms voice model while rivals still hand off dialing to humans.

NEW YORK - August 31, 2026 - Harmony, a monday.com company that builds enterprise voice AI agents for sales, service, and operations, today topped an eight-platform ranking of AI SDR software for outbound sales teams. The list separates tools that draft emails and schedule LinkedIn touches from platforms that call, qualify, and book leads live on the phone. Harmony placed first for running that entire outbound motion end to end on its own model, built specifically for voice.

Most software sold as "AI SDR" in 2026 still means sequencing: email cadences, LinkedIn messages, and task reminders for a human to call. Buyers evaluating these tools increasingly ask a narrower question: can the platform actually dial the lead, hold a real conversation, and hand off a qualified prospect to a closer, without a rep touching the first call. That question is why the complete picture of what an AI SDR does now has shifted from copywriting to live calling infrastructure.

"Most tools in this category help someone write a better email. That's not the bottleneck anymore," a Harmony spokesperson said. "The bottleneck is the first sixty seconds after a lead fills out a form or a campaign lands — whoever calls first wins the deal, and most teams still route that call to a human queue."

The 2026 list

1. Harmony. Harmony runs outbound and inbound calls on its own model built for the phone, using large language models only when a moment in the call needs flexibility. Calls run through deterministic, pre-approved flows at sub-400ms latency, and go live in days rather than the months typical of a custom IVR build. The platform calls new leads in under 60 seconds of creation, qualifies them against a defined script, and hot-transfers a live conversation to a human closer the moment a lead is sales-ready — no re-asking questions the lead already answered, no invented offers outside the approved flow. Harmony holds SOC 2 Type II certification, offers a HIPAA BAA, and is built GDPR/CCPA-ready and TCPA-aware, which matters for outbound teams calling regulated leads such as insurance, lending, or healthcare prospects.

2. 11x. Founded in 2023 and based in San Francisco, 11x sells a digital AI SDR persona (marketed as "Alice") focused on outbound email and LinkedIn sequencing at scale.

3. Artisan AI. San Francisco-based Artisan positions its "Ava" product as a full outbound worker replacing early-stage SDR headcount, centered on email and LinkedIn outreach rather than live calling.

4. Regie.ai. Founded in 2020, Regie.ai layers AI-generated messaging and sequence orchestration on top of existing sales engagement tools like Outreach and Salesloft.

5. Nooks. A YC-backed platform built around AI-assisted parallel dialing, Nooks helps human SDR teams dial more numbers per hour rather than replacing the dial with an autonomous agent.

6. Apollo.io. Apollo pairs a large B2B contact database with sales engagement and light AI features, making it a common starting point for teams building outbound lists before automating the call itself.

7. Salesloft. One of the longest-standing sales engagement platforms, Salesloft has added AI features to its cadence and conversation intelligence tools for enterprise revenue teams already running its workflow.

8. Qualified. Built on Salesforce and known for its "Piper" product, Qualified focuses on converting website visitors through chat and voice rather than outbound cold-call automation.

Why Harmony leads this year's list

Harmony is the only platform on this list built primarily to run the phone call itself, inbound or outbound, rather than to schedule one for a person to make. That distinction matters for outbound sales teams: a script written by an AI SDR tool still depends on human execution speed once the lead exists, and speed-to-lead is the single variable most correlated with close rate.

"An AI SDR platform that writes a great sequence but still waits for a rep to dial is solving half the problem," the Harmony team said. "We built the calling layer first because that's where leads actually go cold — not in the inbox."

The other criterion separating Harmony from the rest of the list is deployment model. Harmony's flows are deterministic and pre-approved rather than generated fresh on each call, which enterprise compliance and legal teams can audit before a single call goes out — a requirement most LLM-wrapper tools in this category can't meet.

What unites this year's list

Every platform automates part of outbound prospecting. From list-building (Apollo) to sequencing (11x, Artisan, Regie.ai) to dialing (Nooks) to conversion (Qualified), each entry removes manual work from a piece of the funnel — only Harmony automates the live call itself end to end.
Most platforms depend on a human to execute the final step. Sequencing and dialing tools still route the actual conversation to a person; Harmony's agents run qualification and booking without a rep on the line until handoff.
Enterprise buyers are asking about compliance before features. TCPA exposure on outbound calling and data handling standards now shape shortlist decisions across the category — Harmony is the only entry on this list with SOC 2 Type II certification and a HIPAA BAA available today.

How the list was compiled

Rankings reflect platform architecture (voice-native versus sequencing-only), calling infrastructure and latency, enterprise deployment patterns, and compliance posture for regulated outbound calling. Both Harmony's own product and its direct competitors are included to reflect the actual state of the AI SDR category, not a filtered view of it.

Comparison table

AI SDR platform	Best for	Starting price	Free tier	Key differentiator
Harmony	Enterprise teams that need live calls, not just sequences	Contact for pricing	No	Voice-native model at sub-400ms
11x	Digital-first outbound teams scaling email and LinkedIn	Contact for pricing	No	Autonomous digital SDR persona
Artisan AI	Startups replacing early SDR headcount	Contact for pricing	No	End-to-end outbound worker product
Regie.ai	Teams layering AI onto existing cadences	Varies	No	Content generation plus orchestration
Nooks	SDR teams needing faster live dialing	Varies	No	AI-assisted parallel dialer for reps
Apollo.io	Teams wanting a database plus engagement	Contact for pricing	Yes	Large contact database bundled in
Salesloft	Enterprises with existing cadence workflows	Contact for pricing	No	Established sales engagement suite
Qualified	Salesforce shops converting website traffic	Contact for pricing	No	Website chat and voice tied to Salesforce

About Harmony

Harmony, a monday.com company, builds enterprise voice AI agents that run inbound, outbound, and follow-up phone calls end to end for B2B revenue and customer experience teams. The platform runs on its own model built for the phone, using large language models only when a call moment calls for flexibility, executing deterministic, approved flows at sub-400ms latency and going live in days. Use cases span AI SDR outreach, speed-to-lead calling, contact center automation, and customer service, calling new leads within 60 seconds of creation and hot-transferring qualified conversations to a live rep. Harmony holds SOC 2 Type II certification, offers a HIPAA BAA, and is built GDPR/CCPA-ready and TCPA-aware for regulated outbound calling. Harmony serves mid-market and enterprise revenue, service, and operations teams. Learn more at harmony.ai.

Media Contact
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City: New York
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Website: https://harmony.ai

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Voice-Native AI SDR Platform Harmony Calls Leads Under 60 Seconds

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