Twilio
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Programmable SMS, voice, and messaging API — the infrastructure layer for communications.
Overview
Twilio is the developer-friendly API for sending SMS, making calls, and building communication workflows. Most automation platforms (GHL, Zapier, Make) use Twilio under the hood. If you need custom messaging flows, high-volume SMS, or programmable voice, Twilio gives you full control.
Pros & Cons
Pros
- Extremely reliable
- Full API control
- Wide carrier coverage
Cons
- Requires developer knowledge
- Not beginner-friendly