# coss.com vs Twilio (https://coss.com/compare/twilio)

> Twilio reaches more channels and sender types worldwide. coss.com is SMS next to email and Verify, with registration done for you.

Twilio Programmable Messaging is the broadest messaging API there is: SMS, MMS, RCS and WhatsApp, short codes and alphanumeric sender IDs, in more than 180 countries. coss.com's SMS runs on Twilio itself (one subaccount per organization), and adds what a product team would otherwise build around it: carrier registration from one form, opt-outs across environments, sandbox environments with a simulator, and the same API key, webhooks and logs as email.

Facts about Twilio checked on 2026-10-30 against the sources listed below.

## At a glance

| | coss.com | Twilio |
| --- | --- | --- |
| Price per segment | SMS (US): $0.0142 per segment; SMS (other countries): $0.0208 to $0.1134 per segment, carrier fees included | US: $0.0083 per segment sent or received, plus carrier fees per message (List prices) |
| Failed messages | Free: billed only once a message reaches a carrier | $0.001 processing fee per message that ends Failed |
| Phone numbers | SMS phone numbers (local): $1.15 per number-month; SMS phone numbers (toll-free): $2.15 per number-month | Local $1.15 a month, toll-free $2.15 a month (bring your own: $0.50) |
| US carrier registration | coss.com submits the 10DLC brand and campaign or the toll-free verification from one dashboard form; fees passed through at cost | A2P 10DLC registration with onboarding fees |
| Channels | SMS | SMS, MMS, RCS, WhatsApp, Facebook Messenger (beta) |
| Sender types | Local and toll-free numbers (US, Canada) | Local 10DLC, toll-free, short codes, alphanumeric sender IDs |
| Countries | The US and Canada by default; others once you allow them, from the priced list on coss.com/pricing | 180+ countries |
| Opt-outs | STOP suppresses the number in every live environment of the organization, START lifts it | — (Not compared: see Twilio's docs) |
| Testing | Sandbox keys simulate every message, with a simulator number for each outcome | — (Not compared: see Twilio's docs) |
| Also on the same API key | Email, inboxes, Verify, Hooks, Risk, Forms, Sign | Twilio Verify and other Twilio products, each with its own pricing |

## When Twilio is the better choice

- **You need more than SMS.** MMS, RCS, WhatsApp and Messenger all go through Twilio's one Messaging API. coss.com sends SMS only: no MMS, no WhatsApp.
- **You need short codes or alphanumeric sender IDs.** High-volume campaigns from a dedicated short code, or your brand name as the sender where countries allow it. coss.com sends from local and toll-free numbers.
- **You send from numbers outside the US and Canada.** Twilio has localized senders in 180+ countries. coss.com's numbers are US and Canadian, so other countries get a message from one of those.
- **You want the platform underneath.** Messaging Services, every channel and every sender type in one account: coss.com uses only Twilio's SMS, and doesn't offer sole-proprietor 10DLC brands.

## When coss.com is the better choice

- **Registration without the paperwork maze.** One form on the organization's SMS page: coss.com submits your business profile, brand, campaign or toll-free verification, and passes the fees through at cost.
- **You only pay for what reached a carrier.** Failed, suppressed and canceled messages cost nothing, and a send to a suppressed number is never handed over.
- **Opt-outs you can't get wrong.** A STOP suppresses the number in every live environment at once, and live sends to it fail as suppressed instead of reaching the carrier.
- **SMS next to everything else.** The same API key, SDK, webhooks, logs and invoice as email, Verify and inboxes, and sandbox environments that simulate every outcome.

## Moving from Twilio

1. **Get a number and register it.** On the organization's SMS page, buy a local or toll-free number and fill in the registration form with the business details you gave Twilio. Reviews usually take a few days. (/docs/sms/senders)
2. **Swap the send call.** Twilio's From, To and Body become coss.sms.send({ from, to, body }) with E.164 numbers. Test it first with a sandbox key and the simulator's numbers. (/docs/sms/sending)
3. **Move status callbacks to webhooks.** Instead of a StatusCallback URL per message, subscribe one webhook endpoint to the sms.* events, and route replies to an environment. (/docs/sms/receiving)

## Frequently asked questions

### Is coss.com built on Twilio?

Yes. coss.com's SMS goes through Twilio, with one Twilio subaccount per organization. coss.com handles the numbers, the carrier registration, opt-outs, billing and webhooks around it.

### Can coss.com send WhatsApp or MMS messages?

No. coss.com sends and receives SMS only. If you need WhatsApp, MMS or RCS, Twilio's Messaging API covers them.

### Does coss.com register my numbers for A2P 10DLC?

Yes. Owners and admins fill in one form on the organization's SMS page, and coss.com submits the business profile, brand and campaign (or the toll-free verification) and passes the carrier fees through at cost.

### Which countries can coss.com send SMS to?

Every organization starts with the US and Canada. Owners and admins can allow other countries that have a price on the pricing page; a few high-fraud countries need coss.com support to unlock them.

### Can I test SMS without sending real messages?

Yes. Sandbox API keys simulate every message without sending or billing anything, and the SMS simulator has a number for each outcome, such as delivered or invalid_number.

## Sources

- [Twilio SMS pricing (US)](https://www.twilio.com/en-us/sms/pricing/us)
- [Twilio Messaging docs](https://www.twilio.com/docs/messaging)
- [Twilio SMS](https://www.twilio.com/en-us/messaging/channels/sms)
- [Twilio: alphanumeric sender ID](https://www.twilio.com/docs/glossary/what-alphanumeric-sender-id)