Twilio
The default global messaging API, with the best docs and Australia's least competitive rates.
Compared on toolweight in:AU SMS APIs
Head-to-head:ClickSend vs Twilio
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Twilio brand colours
Extracted from the artwork and ranked by how much of the mark each covers, not from a brand book, so treat them as observed rather than official.
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What Twilio is
Twilio is the reference implementation for programmable messaging and contracts through Twilio Australia Pty Ltd. Signup is genuinely self-serve, trial credit, an API key and a sent message in minutes, and the documentation remains the best in the category. Australian list pricing is roughly double what local resellers charge, MMS to Australian handsets is not supported, and the volume discounts that would close the gap are reachable only through sales.