coss.com

coss.com vs Twilio Verify

Twilio Verify has more channels and languages. coss.com Verify is SMS and email codes with a fraud guard that runs before anything is sent.

Both charge per successful verification plus the channel, and neither charges for codes nobody enters. Twilio Verify covers SMS, voice, WhatsApp, email, TOTP, push, Silent Network Auth and passkeys, in many languages. coss.com Verify does SMS and email, checks every new verification against the environment's Risk lists, premium-rate numbers and pumping patterns first, and shares the API key, webhooks and invoice with the rest of coss.com.

Read the docs

At a glance

Twilio Verify's side was checked on against its own pages. Prices are list prices.

Featurecoss.comTwilio Verify
Price per verification$0.05 per verification, approved ones only$0.05 per successful verification
SMS channelFrom coss.com's shared numbers, billed at the country's SMS price; or from your own number, billed as any SMSPlus the channel fee: $0.0083 per SMS in the US
Email channelNo extra cost; from your verified domain, else coss.com's senderPlus email pricing
Other channels—Voice, WhatsApp, TOTP, push, Silent Network Auth, passkeys
Fraud protectionFraud guard before sending: Risk lists, premium-rate and non-mobile numbers, Tor, velocity per IP, user, number prefix and country with approval ratesVerify Fraud Guard: automated SMS pumping protection, included
Blocked or unchecked codesBlocked, failed and expired verifications cost only the messages actually sent; blocked ones send nothingNo base fee for failed, expired or incomplete verifications; delivery attempts may still bill
LanguagesEnglishBuilt-in translations
TestingNot compared: see Twilio's docsSandbox keys: codes are always zeros, nothing is sent or billed—
EventsNot compared: see Twilio's docsverification.approved, verification.failed and verification.blocked webhooks, and log lines for every step—

Which to choose

Both are good at what they do. Here is where each one fits better.

Choose Twilio Verify when

  • You need voice, WhatsApp or TOTP

    Twilio Verify has voice calls, WhatsApp, TOTP authenticator apps, push, Silent Network Auth and passkeys. coss.com sends codes by SMS and email only.

  • Your users read other languages

    Twilio Verify translates its messages. coss.com's code messages are fixed English text.

  • You want your own message text

    Twilio Verify lets you bring your own one-time code. coss.com makes the code itself, and its messages are fixed text, which is what carriers approve the shared numbers for.

Choose coss.com when

  • Fraud checks come before the cost

    Every new verification runs through the fraud guard before anything is sent or billed. A blocked one returns its reasons and sends nothing.

  • Your Risk lists apply

    The environment's coss.com Risk allow and block lists, which also guard your sign-ups and logins, decide verifications too: allow wins.

  • Codes are never stored

    coss.com keeps only a keyed hash of each code, never logs it or puts it in a webhook, and discards the message body once it is sent.

  • One account for the rest

    Verify shares the API key, webhooks, logs and invoice with email, SMS and Risk, and sandbox keys make every code zeros for your tests.

Moving from Twilio Verify

  1. 1

    Replace the two calls

    Twilio's Verifications create and VerificationCheck become coss.verify.start({ to, ip }) and coss.verify.check({ to, code }).

    Read the guide
  2. 2

    Set the environment's Verify settings

    Code length, lifetime, attempts, the SMS sender and the countries codes may go to are settings in the dashboard, like a Twilio Verify service's.

    Read the guide
  3. 3

    Pass the end user's IP

    The fraud guard uses ip and your user_id: add them to start, and handle verification_blocked like a failed send.

    Read the guide

Questions

Does coss.com Verify support voice or WhatsApp codes?
No. coss.com Verify sends codes by SMS and email. Twilio Verify also has voice, WhatsApp, TOTP, push, Silent Network Auth and passkeys.
Do I pay for verifications that never get approved?
No. coss.com charges per approved verification. Blocked, failed and expired ones cost only the messages that were actually sent, and blocked ones send nothing.
How does coss.com stop SMS pumping?
Its fraud guard checks every new verification before sending: your Risk lists, premium-rate and non-mobile numbers, Tor, and velocity per IP, user, number prefix and country, with each one's approval rate.
Can I test Verify without sending real codes?
Yes. In sandbox environments the code is always zeros and nothing is sent or billed.

Sources

Twilio Verify's facts were checked on ; their pages are the final word on their prices and features.

The coss.com side

Try coss.com next to Twilio Verify.

A development key costs nothing and delivers nothing, so you can compare with real code.

Add coss.com to this project: read https://coss.com/llms.txt, get a development key with `npx coss-cli init --agents`, and build and test with it.

Pricing