vs
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 12 social channels.
Free up to 2 accounts • Numbers in 55 countries • No markup on Meta's fees
# Search live stock. No API key needed.
curl "https://zernio.com/api/v1/phone-numbers/available?country=GB"
# -> masked numbers, each with a claimUrl to buy it
# With a key: one number, three channels on it
zernio numbers buy --country GB # from $3/mo
zernio sms send --to "+447700900123" --text "Your code is 847291"
zernio calls create --to "+447700900123" --forward-to wss://my-agent
zernio whatsapp send --to "+447700900123" --template order_updateCommunication API Comparison
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
- ✓12 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
Feature comparison
| 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 | 12 | 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 12 social channels.
Phone numbers
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.
Cost breakdown
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.
Voice API
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
WhatsApp 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.
Credit Where It's Due
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?
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
Common Questions
- What's the difference between Twilio and Zernio?
- └Twilio is a communications platform where numbers, SMS, voice and WhatsApp are separate products, each with its own setup and fees. On Zernio you buy one number and it carries calls, SMS and WhatsApp, and the same API key posts to 12 social channels.
- Can I see available numbers before signing up?
- └Yes. Search live stock in 55 countries on zernio.com/phone-numbers, or call GET /v1/phone-numbers/available without an API key. Numbers come back masked, each with a claimUrl. Picking one takes you through signup and straight to the confirm step.
- Can I port my numbers from Twilio?
- └Yes. You can port numbers from 9 countries: United States, Canada, United Kingdom, Spain, Germany, France, Netherlands, Australia, and Brazil. Start the port from the dashboard or the API. Once it completes, calls and SMS on the number run through Zernio.
- Is a Zernio number more expensive than a Twilio one?
- └A bare US local number is $1.15 a month on Twilio and $3 on Zernio. The Zernio price covers WhatsApp on the same number as well as calls and SMS, and WhatsApp messages carry no per-message fee. At a few hundred WhatsApp messages a month, Twilio's $0.005 per message outweighs the difference.
- Do I need documents to buy a number?
- └Not in the US, Canada and a few others, where numbers activate immediately. Countries whose regulators ask for ID and an address take a one-time KYC review of 1 to 3 business days. After that, more numbers in that country are instant.
- How much does Twilio charge for WhatsApp?
- └Twilio charges $0.005 per WhatsApp message, inbound and outbound, on top of Meta's template fees, and $0.001 per failed message. On Zernio, Meta bills your WhatsApp Business Account directly and we add nothing per message.
- What support does Zernio offer?
- └People answer, on Crisp chat and email. For comparison, Twilio holds a 1.1 out of 5 on Trustpilot from 968 reviews, read 25 September 2026.
Search 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.
