What you'll need
Three accounts. Free or close to it.
n8n
Free self-hosted, or n8n Cloud starting $20/mo
OpenAI API key
Pay-as-you-go, ~$0.0001 per message
SMTP or Twilio
SMTP for email, Twilio if you'd rather text
Your CRM or booking software
API access to pull contacts with today's birthday or anniversary
The math
What this is worth, conservatively
Engagement on personalized birthday emails (Mailchimp benchmark)
12 to 15%
Lift over a generic broadcast send
~3x open, ~5x reply
Practice with 2,000 customers, ~5 birthdays/day
~150 birthdays/mo
Cost to run this template forever
~$12/year
Numbers based on Mailchimp's reported engagement on personalized milestone emails vs generic broadcasts. Your conversion to repeat purchase or rebook varies with offer specificity.