Lead Qualification
Instantly screen inbound contacts, confirm match criteria, and log results.
00:00
A monday.com company
Two developer voice AI platforms side by side, with Harmony.ai as the managed option for teams handling 500+ calls a month. Every fact comes from the vendors’ own sites and docs.
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Vapi vs Bland AI vs Harmony.ai
 |  |  | |
|---|---|---|---|
| Platform | |||
| Built for | Developer platform for building voice agents, API-first | Enterprise platform for building and running AI phone agents | Revenue teams: AI receptionist, AI SDR, scheduling |
| Model | Bring your own: choose the LLM and TTS provider per agent | Bundled LLM, STT and TTS on Bland's own infrastructure | Our own models, built for the phone |
| Sounds human | Bring-your-own TTS: ElevenLabs, PlayHT, Cartesia and others, plus your own cloned voices | Bland's own speech models, Bland Speech v3, with voice cloning | Our own conversation models handle interruptions, timing and tone, so calls feel human |
| Implementation | Self-serve; enterprise deployment support on Scale plan | Self-serve plans; enterprise 28-day deployment framework | White-glove |
| Calling & scale | |||
| Latency | Sub-500ms average (published) | ~400ms (published) | Sub-400ms median response |
| Concurrency | 10 concurrent included, $10 per line/month extra; custom on Scale | 10 to 100 concurrent on self-serve plans; custom on Enterprise | 1 to 10,000 parallel calls |
| Telephony | Up to 5 free US numbers with daily outbound caps; import Twilio, Vonage or Telnyx numbers or bring a SIP trunk to scale | Buy US and Canada numbers, bring your own Twilio, or SIP trunk; own carrier relationships to the PSTN | Built-in telephony or bring your own trunks; buy, assign and retire numbers across regions from one inventory; port or forward |
| Spam remediation | Docs walk you through registering STIR/SHAKEN and CNAM with your own carrier; nothing managed | Not published | Number-reputation monitoring, automatic quarantine of flagged numbers, remediation, branded caller ID and local presence |
| IVR, screeners and gatekeepers | DTMF keypad tool for IVR menus, voicemail detection with fallback providers; nothing documented for human gatekeepers | Navigates IVRs with DTMF and its own voicemail-detection models; IVR navigation excluded on the fast turbo model; nothing documented for human gatekeepers | Navigates external phone trees, hold queues and human gatekeepers to reach the right party; DTMF both ways; voicemail detection and retry |
| Insight & improvement | |||
| Reporting | Analytics dashboard and API with custom queries; call logs and transcripts | Every call transcribed, scored and searchable; replay with variables; pipe outcomes to your warehouse | Funnel, call-flow and conversation analytics on 100% of calls; ask for a report in plain language and get it built on the spot |
| Self-improvement | Manual: review calls, edit the assistant, re-run test suites | Manual: pathway edits, simulation testing, canary rollouts of new versions | Reasoning trace on every call, simulate changes on past calls, agent proposes knowledge-base updates you approve |
| Experimentation | Test suites and evals for regression testing; no built-in traffic-split A/B documented | Canary releases with a share of traffic and simulation test suites; no A/B winner selection documented | A/B live or synthetic traffic, publish the winner, roll back; agent keeps what converts across a campaign |
| Pricing & compliance | |||
| Pricing | $0.05/min platform fee plus model costs at cost; HIPAA add-on $2,000/mo | $0.11 to $0.14/min plus up to $499/mo platform fee; enterprise custom | Plans start at $3K/month |
| Compliance | SOC 2, HIPAA (paid add-on), PCI | SOC 2 Type I and II, HIPAA, PCI DSS, GDPR | SOC 2 Type II, HIPAA, GDPR, ISO 27001 |
Vapi and Bland AI figures from vapi.ai, docs.vapi.ai, bland.ai and docs.bland.ai, checked 9 Sep 2026. Vapi and Bland AI are trademarks of their owners. Harmony.ai is not affiliated with either.
Hear it on your own use case.
Four quick questions, then we’ll configure an agent on your use case and let you listen before you commit to anything.
Built for revenue, not a toolkit
Inbound and outbound on one platform. The agent dials, qualifies, and books meetings in your CRM.
Implementation is included
White-glove setup, live in days. No engineering project to stand up telephony, models, and workflows.
Every call becomes data
Every call transcribed and scored. Warm transfers with context, PII redaction, TCPA and DNC aware.
Scale without a quota request
1 to 10,000 parallel calls. Sub-400ms median response at any volume.
Meet Siena, your AI assistant
Enterprise-grade security
Enterprise-grade AI infrastructure with built-in protection and security, data privacy, governance, permissions, and compliance.
