aut2fa
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aut2fa vs Twilio Verify

aut2fa and Twilio Verify both send one-time verification codes through an API. Twilio Verify charges US$0.05 per successful verification plus channel fees and lets you pick the channel on each request. aut2fa charges in Brazilian reais only for delivered codes, at each channel's price, and picks the channel itself.

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Side by side

aut2fa and Twilio Verify compared, from public pages checked on 2026-10-11
aut2faTwilio Verify
ChannelsWhatsApp today; SMS, Telegram and e-mail are coming soon. aut2fa picks the channel: the request doesn't name it.SMS, WhatsApp, voice, e-mail, push, TOTP and Silent Network Auth. Each request names the channel: sms, whatsapp, call, email, sna or auto.
Price modelA price per channel, charged only when the code is delivered, from a prepaid balance.US$0.05 per successful verification, plus standard channel fees.
Currency and paymentBrazilian reais (BRL), prepaid balance. Adding funds by Pix or card is coming soon.US dollars.
Codes that don't completeA code that isn't delivered costs nothing.No base fee for failed, expired, incorrect or uncompleted verifications; channel fees for delivery attempts may still apply.
SMS pumping protectionA per-minute ceiling on every account, plus optional per-application caps per minute and per number per hour; requests over a cap get HTTP 429 before anything is sent.Verify Fraud Guard, included in the base fee.
Your own codeOptional code field.Optional CustomCode parameter, 4 to 10 characters.
Trying it outFree ak_test_ keys; the code aut2fa generates for a test send is always 000000.Free trial, no credit card required.

When Twilio Verify fits better

  • You need SMS, voice or e-mail codes today.
  • You need voice calls, TOTP, push or Silent Network Auth.
  • You want to choose the channel on every request.
  • You want to be billed in US dollars.

When aut2fa fits better

  • You want to pay only for delivered codes, in Brazilian reais.
  • You'd rather not pick a channel on every request: aut2fa routes each send and shows the channel and sending number it used.
  • You want a code that isn't delivered to cost nothing.
  • You want the sent, delivered and read times of each code on your statement.

Sources

Twilio facts come from Twilio's public pages on the date shown. Prices and features change; check the source before deciding.