Interactive Slack messages with buttons, forms, booking links and branching journeys, sent to multiple channels with engagement tracking
Send SMS from your apps through your own Android phone and number
Stage
Startup
Startup
Founded
Not given
2025
Based in
Not given
RO
Pricing model
Freemium
Freemium
Pricing
Free plan: $0 forever. Pro plan: $39/month per seat (minimum 1 seat). Seats are anyone who can create or send messages; recipients do not count.
Free: $0/forever with 100 texts/day and 20 sign-in codes daily (with "free by smstunnel.io" added to API texts after daily limit). 2FA: $3.00/month ($1.50 with 50% launch discount) includes unlimited sign-in codes and 30 texts/day. Standard: $7.00/month ($3.50 with discount) for 500 texts/day and un
Key features
Interactive buttons and CTAs with per-person click tracking
Native Slack forms and modal surveys
Meeting booking integration with Calendly, Cal.com, and HubSpot
Broadcast to multiple channels and Slack Connect simultaneously
Dynamic CRM-powered segments that auto-update
Branching journeys with per-person tracking
Workflow automation with HubSpot, Typeform, and webhook triggers
Per-person and per-channel engagement analytics
Weekly automated reports delivered to Slack
Personalization with {{first_name}} and custom variables
Send SMS from web, desktop, mobile apps or scripts with a single API call
Write texts in the web dashboard and phone sends them within seconds
Messages sent from your own phone number and SIM
Message history and status tracking (pending, sent, unconfirmed, failed)
Link multiple phones to one account and choose which sends
Two-factor sign-in codes (2FA) for your own website or app
WordPress plugin for WooCommerce and Contact Form 7 integrations
All traffic encrypted in transit (TLS) with messages stored in secure account
What makes it different
Supports Slack Connect broadcasts to external partner and customer channels, unlike Slack Workflow Builder
Send to hundreds of channels in seconds without copy-pasting
See exactly who acted, not just aggregate counts
Everything stays in sync across Slack and web app
Free plan with no credit card required, no time limit
Send from your own phone number, not a shortcode, so customers can reply
No per-message fees—only your carrier's normal SMS rates apply
Optional end-to-end encryption on every plan, even Free
Complete user control: link your own phones, create and revoke API keys, delete messages
Private by design: message history stays in your own account
Threadly
SMSTunnel