SimpleTexting starts at $29 a month, forever, for 500 credits on top of effectively the same carrier network you're already paying for. Remindly sends templated reminders through your own Twilio account, so the metered SMS cost stays on your bill at carrier-ish rates and is never marked up. $34, once. A busy shop's reminders cost about $4/mo in real Twilio fees instead of a SaaS markup on them.

• Appointments — Manual entry or CSV import with per-row validation and error reporting.

• Reminder rules — Any offset like 24h, 2h or 15min, by SMS or email, with per-rule templates and merge fields.

• Two-way confirm — Clients reply C to confirm or R to reschedule via the Twilio inbound webhook, with confirmed / pending / no-reply status.

• STOP/START opt-out — Compliant by design — STOP blocks all future sends to that number and is logged, START re-subscribes.

• Quiet hours — Reminders due at 3 AM wait politely until your quiet window ends, deferred and never dropped.

• No-show tracking — Mark appointments showed or no-show and get no-show rate per weekday and per hour-of-day to spot patterns.

• Full send log — Every reminder is logged before dispatch with the rendered message, and duplicates are impossible via a DB unique constraint.

Runs as a Windows desktop app or on any $5 VPS (Docker included).

What's included:

• Full source code (MIT): https://github.com/bensblueprints/appointment-reminder-sms

• Lifetime v1 updates

• Setup guide (README quick start)