What you'll need
Two accounts. Free or close to it.
n8n
Free self-hosted, or n8n Cloud starting $20/mo
Twilio
$1/mo for a number, ~$0.008 per SMS in US
Your booking software
API access to fetch tomorrow's appointments by phone
Confirmation feedback path
Twilio inbound webhook to update the confirmed flag
The math
What this is worth, conservatively
Industry no-show rate before automation
10%
Same business after a 3-touch sequence
3 to 5%
$200/visit, 50 visits/wk, 6% reduction in no-shows
$600/wk recovered
Annualized
~$31,000
Cost to run this template forever
~$96/year
Numbers based on industry benchmarks for service businesses with appointment-based revenue. Your actual lift varies with patient mix, message timing, and how strong the existing single-touch reminder is.