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Twilio alternative for numbers, SMS, calls and WhatsApp
Twilio sells each channel as its own product with its own fees. On Zernio you buy a number in one of 55 countries and it carries calls, SMS and WhatsApp. The same API key reaches 11 social channels.
- Free up to 2 accounts
- Numbers in 55 countries
- No markup on Meta's fees
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Communication API Comparison
Zernio vs Twilio
Zernio
One account, one key, and a single number carrying calls, SMS and WhatsApp
Search live numbers in 55 countries before you sign up
Inbound calls go to an AI agent over SIP or a WebSocket, with no TwiML server to host
Meta's WhatsApp fees passed through with nothing added
11 social channels and one inbox for replies, comments and DMs
Twilio
Numbers, SMS, Voice and WhatsApp each priced and configured as their own product
Searching available numbers needs an account and credentials
Call handling runs through TwiML webhooks you host
$0.005 on every WhatsApp message, in and out, on top of Meta's fees
No social channels
Twilio and Zernio, feature by feature
| Feature | Zernio | Twilio |
|---|---|---|
| Countries with numbers | 55 | 100+ |
| Search numbers without an account | Yes, on the site and the API | No |
| Port in existing numbers | 9 countries | Yes |
| One number for calls, SMS and WhatsApp | Yes | Yes, each set up separately |
| Inbound and outbound calls via API | Yes | Yes |
| Route inbound calls to an AI voice agent | SIP, WebSocket or a phone, set per number | TwiML or Media Streams from your server |
| Voicemail, business hours, IVR, blocklist | Settings on the number | Built by you in TwiML or Studio |
| SMS and MMS | Yes, 12 countries | Yes |
| US 10DLC registration | Filed through the API, with a white-label form | Filed through the console or API |
| WhatsApp per-message fee | None. Meta bills your WABA direct | $0.005 in and out, $0.001 per failed message |
| WhatsApp broadcasts and contacts | Yes, in the API | Build it yourself |
| WhatsApp calling | Yes, route to an AI agent, a phone or SIP | Yes |
| Social channels | 11 | None |
| Ads | 8 networks | No |
| Email and video | No | Yes |
Pricing calculator
Price your own usage on both
Pick countries and monthly volumes for numbers, SMS, calls and WhatsApp. The calculator prices them from Twilio's published rates and Zernio's, carrier fees included, and shows where each one costs less.
One integration
One number, three channels
On Twilio, a phone number, Programmable SMS, Programmable Voice and the WhatsApp sender are separate products with their own setup and pricing pages. On Zernio you buy a number from $3 a month and it carries calls, SMS and WhatsApp. Replies, calls and DMs from all of them land in the same inbox, next to 11 social channels.
Buying a number
A number is the unit you buy. Calls, SMS and WhatsApp are features you turn on for it.
Zernio
Numbers in 55 countries, from $3 a month
Search live stock on the site or the API without a key
Countries that need documents take a one-time KYC of 1 to 3 business days. Repeat purchases there are instant.
Port in numbers from 9 countries: United States, Canada, United Kingdom, Spain, Germany, France, Netherlands, Australia, and Brazil
One flat monthly price per number, whichever channels you use on it
Twilio
Numbers in 100+ countries, including short codes
US local numbers at $1.15 a month, toll-free at $2.15
Search and buy through the console or an authenticated API
Regulated countries need a regulatory bundle per number type
Port in through an online application
Search numbers
See what's in stock before you sign up
Search live numbers in 55 countries by country, area code or digits. Pick one and you land in the dashboard to confirm the purchase. Agents can do the same with GET /v1/phone-numbers/available, which works without a key and returns a claimUrl for each number.
What the same US setup costs
Twilio is cheaper for a bare US number and for recording. Zernio's number price covers WhatsApp too, and WhatsApp messages carry no per-message fee.
| Zernio | Twilio | |
|---|---|---|
| US local number, monthly | $3, with calls, SMS and WhatsApp | $1.15 |
| Outbound call to a US number, per minute | $0.01 | $0.014 |
| Call recording, per minute | $0.004 | $0.0025 |
| Call transcription, per minute | $0.03 | $0.05 |
| WhatsApp fee per message, on top of Meta's | $0 | $0.005 |
| WhatsApp fee per failed message | $0 | $0.001 |
Twilio's prices come from its public US voice, SMS and WhatsApp pricing pages, read 25 September 2026. Pay-as-you-go rates before volume discounts. For other countries and your own volumes, use the Twilio pricing calculator.
Calls without a TwiML server
Twilio asks your server what to do with each call. On Zernio you set the destination and the rules on the number, and your code only handles the conversation.
Zernio
Place calls through the API, or from a browser softphone
Route inbound calls to an AI voice agent, a SIP endpoint or a phone
Voicemail, business-hours windows, an IVR menu and a caller blocklist, per number
Recording and real-time transcription as a setting
One call history across phone and WhatsApp calls
Twilio
Programmable Voice with TwiML, Studio and Media Streams
Every call fetches instructions from a webhook you host
IVR, voicemail and business hours are flows you build
SIP trunking sold as Elastic SIP Trunking
SMS API
Zernio
SMS and MMS on the same number as your calls and WhatsApp
US 10DLC brand and campaign filed through the API
A white-label registration form for your customers, no Zernio login needed
Reuse an approved campaign on new numbers with no new fee
Replies thread into the same inbox as WhatsApp and social DMs
Twilio
Programmable Messaging in more countries, including short codes
US 10DLC registration through the console or API
Per-segment price plus a carrier fee that varies by carrier
Two-way threads through the separate Conversations API
Both wrap the WhatsApp Cloud API
Twilio adds $0.005 to every WhatsApp message, inbound and outbound, on top of Meta's fees. On Zernio, Meta bills your WhatsApp Business Account directly.
Zernio
No per-message fee on top of Meta's
Create, list and import templates from Meta
Broadcasts with per-recipient variables and scheduling
Contacts with groups, tags and bulk import
Calling in and out, routed to an AI agent, a phone or SIP
Connect in minutes with Meta Embedded Signup
Twilio
$0.005 per message, inbound and outbound
$0.001 per failed message
Templates through the Content Template Builder
Broadcasts and contact storage are yours to build
Moving from Twilio?
Port your numbers
Port in numbers from 9 countries: United States, Canada, United Kingdom, Spain, Germany, France, Netherlands, Australia, and Brazil. They keep working for calls and SMS once the port completes. Your WhatsApp Business Account and templates belong to you, so you point them at Zernio instead of Twilio. Swapping Twilio's REST calls for Zernio's is most of the code change.
Check your Twilio numbers first
Paste a Twilio number into the portability checker to see if it can move, whether it qualifies for FastPort and what the port will ask you for. No signup needed.
What Twilio does well
Coverage
Numbers in 100+ countries, including short codes, and messaging reach well past the countries where Zernio sells numbers.
Breadth
Email through SendGrid, video, verification and the Flex contact center, all from one vendor.
Scale
Years of carrier relationships and infrastructure built for very high message and call volumes.
Which One?
Zernio or Twilio
Choose Zernio if you:
Want calls, SMS and WhatsApp on one number and one key
Want to search and pick a number before signing up
Are routing calls to an AI voice agent and don't want to host TwiML
Would rather Meta billed your WABA directly, with no per-message fee in between
Want social channels and a shared inbox in the same account
Choose Twilio if you:
Need numbers outside the 55 countries where Zernio sells them
Send over short codes at high volume
Also need email, video or a contact center from the same vendor
Want the cheapest bare US number and don't use WhatsApp
Frequently Asked Questions
vsSearch a number, then build on it
Free up to 2 accounts, no card. Pick a number in one of 55 countries and it carries calls, SMS and WhatsApp.
- SOC 2
- GDPR compliant
- 99.97% uptime
- Under 50ms response