Postscript vs Klaviyo
Postscript is an SMS-first marketing platform for Shopify brands with AI-driven messaging, onsite opt-ins, and compliance tools. Klaviyo is an omnichannel email and SMS platform with a real-time customer data platform, broader integrations, and AI agents for campaign creation and support.
Last updated
The summary above and the “Which should you choose?” section are written with AI from our two listings. The tables and answers come straight from the listings. Prices and features change, so check each vendor's website before you decide. How we use AI
At a glance
| Listing | Postscript | Klaviyo |
|---|---|---|
| Starting price | Free plan, paid from $100/mo | Free plan |
| Cheapest paid plan for a year | $1,200 a year | Not listed |
| Free plan | Yes | Yes |
| Free trial | Yes, 30 days | No |
| Works with | Shopify | Shopify, WooCommerce, BigCommerce, Salesforce Commerce Cloud |
| Features | 18 features listed | 17 features listed |
| Integrations | 1 integration listed | 8 integrations listed |
| Public API | Yes | Yes |
| Business size | Startup, SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| Listing data checked | Sep 24, 2026 | Sep 25, 2026 |
Pricing compared
Postscript
- Starter Free 30-day free trial
- Growth $100/mo 30-day free trial
- Professional $500/mo 30-day free trial
- Enterprise Custom pricing 30-day free trial
- Postscript AI Plan $699/mo 30-day free trial
Features compared
Both list 14 of these features. 4 are listed only for Postscript. 3 are listed only for Klaviyo.
| Feature | Postscript | Klaviyo |
|---|---|---|
| AI | Listed | Listed |
| Analytics | Listed | Listed |
| API | Listed | Listed |
| Automation | Listed | Listed |
| Dashboard | Listed | Listed |
| Drag & Drop | Listed | Listed |
| Listed | Listed | |
| Import | Listed | Listed |
| Mobile | Listed | Listed |
| Personalization | Listed | Listed |
| Reporting | Listed | Listed |
| Segmentation | Listed | Listed |
| SMS | Listed | Listed |
| Templates | Listed | Listed |
| A/B Testing | Listed | Not listed |
| Export | Listed | Not listed |
| Real-time | Listed | Not listed |
| Webhook | Listed | Not listed |
| Collaboration | Not listed | Listed |
| GDPR Compliant | Not listed | Listed |
| Multi-channel | Not listed | Listed |
Platforms and integrations
Ecommerce platforms
| Platform | Postscript | Klaviyo |
|---|---|---|
| Shopify | Listed | Listed |
| BigCommerce | Not listed | Listed |
| Salesforce Commerce Cloud | Not listed | Listed |
| WooCommerce | Not listed | Listed |
Integrations
Both list 1 of these integrations. 7 are listed only for Klaviyo.
| Integration | Postscript | Klaviyo |
|---|---|---|
| Shopify | Listed | Listed |
| Not listed | Listed | |
| Google Analytics | Not listed | Listed |
| Not listed | Listed | |
| Mailchimp | Not listed | Listed |
| Slack | Not listed | Listed |
| WooCommerce | Not listed | Listed |
| Zapier | Not listed | Listed |
More details
| Detail | Postscript | Klaviyo |
|---|---|---|
| Pricing model | Tiered monthly subscription plans plus per-message usage charges; carrier fees passed through at cost; no profile fees; option for enterprise/custom contracts. | Free plan with core features; paid plans scale based on number of contacts and channel usage (email, SMS, etc.); Enterprise pricing available for large organizations. |
| Support | Live chat (weekday), email support, Customer Experience Advocates, and dedicated Customer Success Managers for enterprise customers; Postscript Plus managed service provides in-house strategists. Live chat Monday–Friday 6am PT to 5pm PT | Email, live chat, dedicated Slack channel for some plans, professional services and onboarding, partner/agency network Varies by plan: Standard: weekdays 24/5, no weekend coverage; Professional: weekdays 24/5, weekends local business hours; Enterprise: 24/7 weekdays and weekends. |
| Security and compliance | Built-in compliance guardrails aligned to TCPA and carrier requirements; Compliance Team reviews subscriber list uploads and verification processes; links provided to Privacy Policy and Data Processing Agreement on the site. | SOC 2 Type II certified, GDPR support with Data Processing Agreement and self-service tools, EU–US Data Privacy Framework and Standard Contractual Clauses supported; offers EU and US data residency options. |
| Product maturity | Established platform repositioned as an AI-native "Postscript 2.0" with full multichannel feature set, enterprise offerings, and active product innovation as described on the site. | Mature, widely adopted platform with large customer base (205,000+ brands) and enterprise features, professional services, and extensive integrations. |
| Not a good fit for | Not a good fit for businesses that do not use SMS/email as a retention channel or for organizations seeking 24/7 support coverage without an enterprise agreement. | Not a good fit for organizations that need a purely free, limited-contact email tool or those unwilling to manage shared GDPR responsibilities. |
Pros and cons
From each app's App4Ecom listing.
Postscript
Pros
- Unified multichannel platform (SMS, RCS, Email) built from the ground up for AI-native personalization
- Agentic Context Platform (ACP) included with every plan to apply brand and customer context across messages
- Built-in compliance guardrails and a Compliance Team to review uploads and help with verification
- Lower base messaging rates and transparent carrier fee pass-through to reduce total cost of ownership
- Fast product innovation and tools for advanced testing (Infinity Testing) and 1:1 journeys (Shopper)
Cons
- Dedicated short code through carriers costs $750/month (passed through at cost)
- Postscript AI plan adds a significant monthly cost (listed as $699/month) and per-message charges can vary by product
- Starter tier requires a $49 monthly minimum spend despite $0/month base price
- Live chat support hours are limited to weekdays (6am PT–5pm PT) which may not suit 24/7 support needs
Klaviyo
Pros
- Unifies customer data into a real-time CDP for consistent cross-channel personalization
- AI-driven agents (Composer and Customer Agent) that automate campaign creation and customer support
- Supports omnichannel messaging including email, SMS, RCS, WhatsApp, and mobile push
- 350+ pre-built integrations and developer APIs to connect your tech stack
- Enterprise-grade throughput and uptime claims (high events, API calls, and 99.95% uptime)
Cons
- Advanced support tiers, faster response times, and enterprise SLAs are gated behind Professional or Enterprise packages
- Pricing scales based on number of contacts and channel usage, which can increase costs for large lists
- GDPR compliance is a shared responsibility; customers must manage how they collect and use customer data
Which should you choose?
Pick Postscript if your priority is Shopify-native SMS-first retention with built-in TCPA/compliance guardrails and AI messaging tools. Choose Klaviyo if you need a real-time CDP, broader platform support and integrations, and enterprise support options.
Postscript: Ecommerce and DTC brands on Shopify that rely on SMS/email as primary retention channels and want an AI-native, compliance-focused messaging platform.
Klaviyo: D2C and ecommerce brands that need a unified real-time customer data platform, broad integrations, and omnichannel marketing automation with AI-assisted campaign creation.
Frequently asked questions
Which is cheaper, Postscript or Klaviyo?
Postscript lists paid plans from $100/mo. Klaviyo lists a free plan but no paid plan prices, so ask its team for a quote to compare.
Do Postscript and Klaviyo have a free plan?
Yes, both list a free plan. Postscript offers a 30-day free trial.
Which platforms do Postscript and Klaviyo work with?
Postscript works with Shopify. Klaviyo works with Shopify, WooCommerce, BigCommerce and Salesforce Commerce Cloud. Both work with Shopify.
What features do Postscript and Klaviyo have in common?
Both list AI, Analytics, API, Automation, Dashboard, Drag & Drop and 8 more. Only Postscript lists A/B Testing, Export, Real-time and Webhook. Only Klaviyo lists Collaboration, GDPR Compliant and Multi-channel.
Do Postscript and Klaviyo have an API?
Yes, both list a public API.
Where this data comes from
Postscript
Listing data refreshed September 24, 2026.
- postscript.io Main source
- postscript.io/pricing Official website
- developers.postscript.io/docs/getting-started Official website
Klaviyo
Listing data refreshed September 25, 2026.
- klaviyo.com Official website
- klaviyo.com/success/premium-support Official website