AI call orchestration
Your app makes
the call.
Harper Voice takes care of the hard parts: retrying busy lines, handling voicemail, staying compliant, negotiating in real time, and delivering a clean outcome back to your app. So you can add outbound calling to your product without it swallowing your roadmap.
Adding a call feature shouldn't become a platform project.
Here's what you're signing up for without Harper Voice, and what you get with it.
Without Harper Voice
Voice infra
Vapi, Retell, Bland
Telephony
Twilio, Telnyx
Workflow engine
Temporal, Inngest
Retry logic
When? How many?
Your app
+ all the glue
Compliance
TCPA, DNC, hours
Calendar
Read, write, sync
Date / time logic
"Sometime next week"
Admin tools
Status, call center
5+ vendors · 5+ dashboards · 5+ invoices · unpredictable costs
VS
With Harper Voice
Your app
One integration
Harper Voice
Retry · scheduling · compliance · transcripts · outcomes
Voice infra
Telephony
Workflow
1 vendor · 1 dashboard · 1 invoice · costs you can predict
How it works
Configure your agent.
We orchestrate every call.
Harper Voice sits between your product and the phone call. You define the goal and the rules. We handle everything from first dial to final outcome, with full visibility the whole way.
1
Configure your agent
Define your agent's persona, goal, and behavior in the Harper Voice dashboard. Set retry rules, compliance windows, escalation paths, and connect any APIs the agent should be able to call mid-conversation. No scripting required.
2
Trigger a call from your app
When your product needs a call made, send us the recipient and context. Harper Voice orchestrates all of it: dialing, retrying, handling voicemail, navigating the conversation, and staying within your configured rules.
3
Monitor and receive outcomes
Watch every call in real time from your dashboard, your own virtual call center. When a call completes, the structured outcome and full transcript come back to your app. When something fails, you know exactly why.
What's included
Every part of a phone call,
already built.
🔁
Retry engine
Configurable retry policies with backoff handle busy signals, no-answers, and voicemail. Failed calls surface in a dead-letter queue, not your Slack.
🗓
Live negotiation
The agent resolves scheduling mid-call. It parses natural language, checks availability via your tools, and proposes and confirms times in real time.
🔌
Custom tools
Register your own APIs and the agent can call them mid-conversation. It can read a calendar, look up an order, or write a booking without ever ending the call.
⚖️
Built-in compliance
TCPA enforcement, quiet hours, DNC list checking, consent tracking, and an immutable audit log. All applied automatically, before every call.
📞
Caller ID options
Calls go out from platform-provisioned numbers. You can optionally surface your users' own verified numbers as caller ID, and we provide the verification widget.
📊
Full observability
Live call feed, searchable transcripts, outcome analytics, and failure breakdowns across every call your app has ever placed.
🎨
Embeddable components
Voice selectors and caller ID verification flows, delivered as white-labeled UI components your users interact with inside your app, branded as yours.
🏗
Sandbox & simulator
Test your entire call flow, from agent behavior to tool calls to outcomes, without placing a single real call. Full fidelity, no surprises in production.
Who it's for
Anyone building a product where a phone call needs to happen.
You don't need to know what Twilio, Vapi, or Retell are. You don't need to wire together five services and reconcile five bills. You need calls to happen reliably, compliantly, and without consuming your roadmap.
Harper Voice is the orchestration layer. You own the experience.
Start building →Sound familiar?
- “I want my app to make calls but I don't even know where to start
- “Every time I look into it there are five services I've never heard of and I need all of them
- “I scoped it as a weekend feature. Three months later I still don't have retry logic working
- “I dropped it. It was going to need its own engineer just to keep it running
- “I have no idea what happens to a call that doesn't connect
That's exactly what Harper Voice was built for.
Phone calls belong in more products than you'd think
