Interline is a unified inbox for SMS, WhatsApp, and email, built for retail and customer service teams that are tired of losing track of conversations across channels.
Every message a customer sends, whether it is a text, a WhatsApp message, or an email, lands in one shared inbox your whole team can see and reply from. No more checking three apps. No more "I thought you answered that one."
What you get
Built for compliance
Interline is 10DLC registered and an official WhatsApp Business API provider. It supports WhatsApp Coexistence, so you keep your existing WhatsApp app, groups, and status. Opt-outs are handled automatically and end to end encryption is included. HIPAA-eligible plans are available on request.
Works with what you already have
Keep your existing phone number and connect the POS system you already run.
Plans start at $89.99/month.
A startup from Brooklyn, the United States.
Unified Inbox
SMS, WhatsApp, and email in one shared team inbox
Supported Channels
SMS, WhatsApp, and email. Instagram, TikTok, and web chat coming soon
AI Reply Assist
Suggests and sharpens replies before you send them
AI Agent
Answers common customer questions from your knowledge base
Broadcast Campaigns
Scheduled SMS and WhatsApp campaigns with automatic opt-out handling
Automation
Autoresponders, keyword triggers, and auto-assign rules
POS Integration
Turn customer messages into orders in your point of sale system
Compliance
10DLC registered, official WhatsApp Business API, end to end encryption
WhatsApp Coexistence
Keep your existing WhatsApp app, groups, and status
API Access
Send and receive messages programmatically. Included on Pro and above
Most shared inboxes were built for email and had SMS bolted on later. Interline was built the other way around, for businesses whose customers actually text them.
SMS, WhatsApp, and email all land in one view per customer, so you see the whole relationship instead of three disconnected channels.
Two things really set it apart:
It is aimed at retail and community businesses rather than enterprise ticket queues.
If you are weighing Interline against Podium, Front, Help Scout, Intercom, or Missive, the differences come down to three things.
It is also 10DLC registered, so your business texting is compliant from day one. A full shared inbox starts at $89.99 per month including up to 3 users.
Small and growing retail and service businesses whose customers reach them by text and WhatsApp rather than by phone call or support ticket.
In practice that means grocers, butchers, fish markets, food shops, caterers, and community organizations. Typically teams of roughly 2 to 20 people who share one business number and are currently juggling personal phones, WhatsApp groups, and a shared email account.
It also fits any customer service team that simply wants SMS, WhatsApp, and email in one place instead of three.
Interline is built by MessageCollab, a company founded in Brooklyn, New York in 2021.
The product came out of a pattern the team kept running into with local retail and service businesses: their customers had largely stopped calling and started texting and WhatsApping instead, but the businesses had no real system for handling it. Orders and questions were scattered across personal phones, WhatsApp groups, and a shared email account, and messages slipped through the cracks.
Interline launched in early 2026 to fix that. One shared inbox where SMS, WhatsApp, and email land together, automation and AI to handle the repetitive parts, and a POS connection so a customer message can turn into an order.
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