Postscript vs Sender
A side-by-side comparison for e-commerce sellers — platforms, pricing, free trials and ROI.
| Category | Email & SMS | Email & SMS |
|---|---|---|
| Platforms | Shopify DTC | WooCommerce Shopify DTC |
| Pricing | Free trial; usage-based, paid plans from $100/mo | Free Forever plan (2,500 contacts, 15,000 emails/mo) |
| Free trial | Yes | Yes |
| Affiliate program | Direct | — |
| ROI | Turns SMS into a measurable revenue channel, with top brands earning a strong multiple on every dollar of texting spend. | Lets growing stores run automated email campaigns and transactional emails with high deliverability at low or no cost on the free tier. |
Which should you choose?
Shopify and Shopify Plus DTC brands that want SMS as a dedicated, high-converting revenue channel.
Growing businesses and small ecommerce stores wanting affordable email (and SMS) marketing with a strong free tier.
Postscript
Pros
- Deeply integrated with Shopify and Shopify Plus data
- Strong compliance and deliverability for US texting
- Conversational selling features drive measurable replies and revenue
Cons
- Shopify-only, so not an option for WooCommerce or Amazon sellers
- Usage-based pricing plus message costs add up at scale
- SMS-focused, so you still need a separate email tool
Sender
Pros
- Generous Free Forever plan (2,500 contacts / 15,000 emails)
- 24/7 live support included even on free tier
- Strong deliverability monitoring
- Large template library and drag-and-drop builder
Cons
- Free plan caps contacts and monthly email volume
- Paid plan numbers not shown on the homepage
- Less ecommerce-specialized than Shopify-native tools
Other tools to consider
Email & SMS marketing built on unified customer data for ecommerce
Collect, manage, and display product reviews and UGC for ecommerce
AI marketing copilot for product descriptions and brand-voice copy at scale
AI-driven ecommerce personalization and product recommendations for Shopify brands
Easy, low-cost mass SMS marketing with automation and keywords
Influencer, affiliate and referral programs that turn customers and creators into a sales channel