What does Postscript do?
Postscript is a premium SMS Marketing app for Shopify. As a leading solution in the SMS Marketing space for Shopify, it typically provides the following core capabilities:
Two-way SMS conversations
Automated SMS flows
Compliance management (TCPA)
Campaign segmentation
Pros & Cons of Postscript
What it gets right
- • High open rates compared to email
- • Immediate delivery for flash sales
- • Strong ROI for VIP segments
Where it falls short
- • Extremely high cost per message sent
- • Carrier fees eat into profit margins
- • High unsubscribe rates if overused
The Pricing Trap: How Postscript Scales
"You pay a base platform fee plus a high variable cost per text message sent, which heavily compresses margins on lower AOV products."
Architectural Verdict
While Postscript penalizes your growth by exponentially increasing your monthly bill as your subscriber list expands, Systeme.io / Brevo allows you to scale indefinitely with flat-rate or significantly cheaper volume pricing, saving massive margin at scale.
How to migrate to Systeme.io / Brevo
Migrating away from Postscript requires following this exact architectural path to prevent data loss and ensure a seamless cutover:
- Step 1: Export all historical data (CSV/JSON) directly from the Postscript admin dashboard before canceling your subscription to prevent data loss.
- Step 2: Install and configure Systeme.io / Brevo, using our free blueprint to map your existing data structures to the new system.
- Step 3: Run both systems in parallel for a 7-day testing phase to verify data parity, then officially uninstall Postscript from your Shopify store.
