Mailability vs Postscript
A side-by-side comparison for e-commerce sellers — platforms, pricing, free trials and ROI.
AI revenue-boost layer for Klaviyo that turns unengaged email profiles into buyers
| Category | Email & SMS | Email & SMS |
|---|---|---|
| Platforms | Shopify DTC | Shopify DTC |
| Pricing | — | Free trial; usage-based, paid plans from $100/mo |
| Free trial | No | Yes |
| Affiliate program | — | Direct |
| ROI | Reactivates dormant email profiles into purchasers, with the brand citing over a 32% increase in email revenue. | Turns SMS into a measurable revenue channel, with top brands earning a strong multiple on every dollar of texting spend. |
Which should you choose?
Ecommerce brands already on Klaviyo who want to squeeze more revenue out of unengaged email subscribers.
Shopify and Shopify Plus DTC brands that want SMS as a dedicated, high-converting revenue channel.
Mailability
Pros
- Works as a layer on top of existing Klaviyo setup
- Focused specifically on recovering revenue from unengaged subscribers
- ROI-positive cashback guarantee advertised
Cons
- Requires Klaviyo, so not a standalone email platform
- Pricing is not transparent; access is demo-only
- Narrow scope limited to email reactivation
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
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
Shopify-first SMS marketing with flows and segmentation