Postscript
postscript.io
AI-powered SMS marketing platform built for Shopify merchants.
Quick Information
- Category:
- Marketing
- Pricing:
- Freemium
- Platforms:
- Web, Shopify integration
- Free Plan:
- Yes
- API Available:
- Yes
- Last Verified:
- September 2026
What Is Postscript?
Postscript is an ecommerce SMS marketing platform (the Shopify pick for SMS marketing among major platforms in 2026) offering four plans: Starter (free platform fee, pay-per-message at $0.015/SMS and $0.045/MMS), Growth (around $100/month), Professional (around $500/month), and Enterprise (custom) — all plans start with a free 30-day trial and come with a 4x ROI guarantee.
Its AI Plan bundles several genuinely revenue-focused AI products: Infinity Testing for Automations and Campaigns lets teams test hundreds of on-brand message variants in a fraction of the time manual testing would take; an always-on 1:1 shopping assistant instantly answers customer questions and drives sales; and CashBack lets customers choose how and when to redeem incentives, so businesses only pay out for incentives when they truly convert, protecting profit margins.
It's aimed at ecommerce brands (particularly on Shopify) wanting AI-assisted SMS marketing with genuine revenue-protection mechanics like CashBack's pay-only-on-redemption model, with the Starter plan's pay-per-message structure providing a genuinely low-commitment entry point before scaling into Growth or Professional tiers as message volume grows. See our Marketing & Sales tools directory for related tools like Attentive and Klaviyo.
What Can You Use Postscript For?
Ecommerce SMS marketing
Sends SMS and MMS marketing campaigns to ecommerce customers.
AI-powered message testing
Tests hundreds of on-brand message variants automatically using Infinity Testing.
AI shopping assistant
Answers customer questions and drives sales through an always-on 1:1 assistant.
Postscript Features
- Infinity Testing — Automatically tests hundreds of on-brand message variants for automations and campaigns.
- AI shopping assistant — Provides always-on 1:1 customer engagement that answers questions and drives sales.
- CashBack incentives — Lets customers choose redemption timing, so businesses pay only on actual redemption.
Who Is Postscript For?
- Ecommerce brands — Uses SMS marketing with AI-assisted testing and shopping assistance to drive revenue.
- Shopify merchants — Uses Postscript as the platform’s recommended SMS marketing pick for 2026.
Postscript Pros & Limitations
What We Like
- Genuinely low-commitment Starter plan with pay-per-message pricing and no platform fee
- CashBack’s pay-only-on-redemption model protects profit margins on incentive spending
- 4x ROI guarantee backs the platform’s revenue claims with real accountability
Limitations
- Growth and Professional plans ($100-$500/month) required for more advanced features and volume
- AI Plan bundle is a separate add-on requiring evaluation of true total cost
- Enterprise-level customization requires custom contract pricing
Postscript Pricing
| Plan | Price | Main Features |
|---|---|---|
| Starter | $0 platform fee + $0.015/SMS, $0.045/MMS | Pay-per-message SMS marketing |
| Growth | ~$100/month | Expanded SMS marketing features |
| Professional | ~$500/month | Advanced automation and AI features |
| Enterprise | Custom | Full feature set, custom integrations |
Pricing was last verified September 2026. Check the official website for the latest pricing.
AI Listing Jungle Ranking
- Global Rank:
- #690
- Overall Score:
- 18.3/100
- Monthly Users:
- –
- Rank Change:
- ▲ 1
This ranking reflects AI Listing Jungle's own independent scoring methodology and is not an endorsement by Postscript or its company. How Our Rankings Work
Frequently Asked Questions
Is Postscript free?
The Starter plan has no platform fee, only pay-per-message pricing; a free 30-day trial is also available.
How much does Postscript cost?
From pay-per-message on Starter up to ~$500/month on Professional, plus custom Enterprise pricing.
What does CashBack do?
Lets customers choose redemption timing so businesses only pay out incentives that actually convert.
Is there an ROI guarantee?
Yes, a 4x ROI guarantee is included.
Our Take
Postscript's CashBack mechanic — paying incentives only on actual redemption — is a genuinely smart profit-protection design that most competing SMS platforms don't offer.
The Starter plan's pay-per-message, no-platform-fee structure makes it a genuinely low-risk entry point for smaller ecommerce brands testing SMS marketing.
Postscript Alternatives
Postscript Comparisons
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