Type a message and Hellio speaks it in a natural voice, or upload your own recording, then broadcast the call to one recipient or thousands. No apps, no data plan, no reading required. One API, the same platform you already use for SMS and WhatsApp.
Pay per second of audio, per recipient. See the exact cost before you send.
YourClinic
Voice call · 00:14
What you can build
From a single verification call to a broadcast reaching thousands, all through the same Hellio API and dashboard.
Type your message and we synthesize it into natural-sounding speech. Pick from six voices and preview the audio before you send.
Upload an MP3 or WAV, or point us at an audio URL, and we play it to every recipient exactly as recorded.
Send to a pasted list, an imported file or your saved contact groups. One campaign can reach thousands of numbers.
Queue a broadcast now or schedule it for later, and Hellio places the calls at the right moment.
Deliver one-time passwords as a spoken call, on their own or as an automatic fallback when an SMS code does not land.
Calls route through multiple carrier gateways with automatic failover, and per-call delivery reports flow back to your dashboard.
How it works
Type the message you want spoken and choose a voice, or upload a pre-recorded MP3 or WAV file.
Paste numbers, import a file or select a contact group. We show the audio length and the exact cost before anything is sent.
Hellio dials every recipient, plays your audio, and reports each call back so you can see who was reached.
{
"recipients": ["233241234567", "233551234567"],
"text": "Hello! Your order 1042 is ready for pickup.",
"voice": "nova"
}Use cases
A ringing phone gets answered. Voice reaches feature phones, people on the move, and customers who cannot read an SMS.
Read verification codes aloud over a call. Ideal as a fallback when SMS is delayed, filtered or unavailable, so the code always gets through.
Appointment reminders, payment-due notices, outage alerts and emergency broadcasts that demand immediate attention.
Product launches, event invitations, community announcements and political outreach, delivered in your own recorded voice.
No smartphone, no data and no literacy required. A voice call in a familiar voice reaches audiences SMS and email never will.
Voice broadcasts are billed per second of audio, per recipient, from the same wallet as your SMS and WhatsApp traffic. A 12-second reminder costs exactly 12 seconds worth, and you see the estimate before you confirm the send.
Send from the Voice Broadcast screen in your dashboard or call the API with the token you already have. Campaign history, per-call delivery reports and spend all live next to your other channels.
Create an account, type your first message, and hear it ring through in minutes.
Guides & insights
When a voice message lands better than a text, and how to mix channels.
Guides & How-tos
You have three ways to reach a customer and they are not interchangeable. A quick guide to picking the right one so your message lands and does not annoy.
Business Growth
Every provider promises fast, reliable and secure. The gaps only show once you are live. Seven things worth comparing before you commit, and where Hellio stands on each.