Klaviyo or Postscript?

If you're serious about growing your eCommerce brand with SMS marketing, two platforms stand out: Klaviyo and Postscript.

Both offer powerful tools. But which one gives you better automation, smarter segmentation, deeper integrations, and stronger long-term value?

This guide is built for DTC CMOs and retention marketers ready to:

• See the real pricing differences — no surprises.

• Compare automation, analytics, flows, and compliance head-to-head.

• Choose a platform that scales with your brand, not against it.

Let’s find out which tool will help you win more customers — and keep them.

Klaviyo vs Postscript Quick Comparison Table

Segmentation and Automation

Segmentation and automation decide how deeply you can personalise customer journeys. Both Klaviyo and Postscript offer tools to automate SMS, but one delivers far more flexibility for serious DTC growth.

Klaviyo:

• Drag-and-drop visual flow builder for easy journey mapping.

• Combine email and SMS triggers inside the same flow.

• Advanced filters, splits, and behaviour-based logic (like targeting based on cart value or purchase history).

Postscript:

• SMS-only automations are triggered through tags or event logic.

• No visual builder or complex branching.

• Basic segmentation capabilities, mainly campaign-wide rather than customer-specific.

Use Case Example:

If you're setting up an abandoned cart journey:

• Klaviyo allows you to branch based on cart value, sending bigger discounts to higher-value carts./

• Postscript can only send a generic reminder SMS to all abandoned carts, missing the chance for high-value targeting.

Want smarter flows that drive conversions? Learn how Klaviyo Flow Triggers power better automation.

SMS Features and Compliance

Strong compliance and flexible SMS tools are critical for scaling safely. Klaviyo and Postscript both cover the basics, but they approach SMS differently based on their platform strengths.

Klaviyo:

• Natively integrates SMS and MMS into multi-channel email flows.

• Built-in compliance features like quiet hours, double opt-in, GDPR, and TCPA adherence.

• Centralised consent management across both email and SMS, simplifying customer data handling.

Postscript:

• Focuses solely on SMS, offering advanced 2-way messaging and smart reply automation.

• Strong compliance support, including opt-out keywords, TCPA tools, and fast setup for quiet hours.

Use Case Example:

• Klaviyo is ideal if you want SMS to be part of larger campaigns (e.g., sending an SMS reminder after an email offer).

• Postscript is a great fit if you need standalone, conversational SMS campaigns like flash sales or real-time customer support replies.

  
  

Pricing Comparison

Klaviyo:

• Free Plan: Up to 250 profiles, 500 email sends/month, and 150 SMS credits.

• Paid Plans: Start at $20/month for 500 contacts (email only).

• Email + SMS (2.5k–3k contacts): Around $85/month for 30k emails and 1250 SMS credits.

• SMS Pricing: Volume-based, varies by country.

• Included Features: 350+ integrations, reporting dashboards, email support, generative AI for content and Multi-channel segmentation. Klaviyo

  
  

Postscript:

• Starter Plan: $0/month, but requires $30 minimum spend.

• Growth Plan: $100/month – includes unlimited opt-in keywords and live chat + email support.

• SMS Pricing: $0.008/SMS, $0.03/MMS + carrier fees.

• Included Features: Visual Flow Builder, unlimited segments, dedicated toll-free number, 2 opt-in keywords, campaign and automation tools. Postscript

  
  

Analytics and Attribution

Good analytics turns insights into action. When comparing Klaviyo and Postscript, the depth and breadth of reporting reveal major differences, especially if you're aiming for long-term customer growth.

Klaviyo:

• Tracks revenue attribution across flows, campaigns, and entire customer journeys.

• Offers predictive analytics including Customer Lifetime Value (LTV), churn risk, and cohort growth trends.

• It provides a unified dashboard view that combines both email and SMS performance.

Postscript:

• Tracks basic SMS performance like click rates, opt-outs, and direct revenue via UTM parameters.

• No built-in predictive analytics or cohort tracking.

Use Case Example:

• Klaviyo helps brands predict future customer value and optimise marketing budgets based on LTV forecasts.

• Postscript suits brands focused on short-term campaign wins like flash sales, where immediate clicks and revenue tracking are enough.

Using predictive metrics can transform the retention strategy. Dive deeper into smarter forecasting with our guide to Klaviyo Predictive Analytics.

Integrations and Ecosystem

Strong integrations make or break your ability to personalise and automate campaigns across channels. 

Klaviyo:

• Natively integrates with Shopify, Gorgias, ReCharge, Okendo, Meta (Facebook/Instagram Ads), Typeform, Postscript, and more.

• Supports deep data syncing, allowing campaigns to trigger based on browsing history, purchasing behaviour, or survey responses.

Postscript:

• Integrates with Shopify, Gorgias, Yotpo, Loop Returns, and Zapier.

• Focuses mainly on outbound SMS triggers with fewer options for multi-channel behavioural syncing.

Use Case Example:

• Klaviyo is ideal for brands building complex flows across email, SMS, ads, and surveys, all triggered by live customer behaviour.

• Postscript fits brands that want fast SMS launches without the need for advanced cross-channel automation.

  
  

Platform Experience and Support

Here’s a quick look at how Klaviyo and Postscript compare when it comes to user experience, training, and support—key factors when choosing a platform that your team can rely on daily.

Migration Experience

Switching SMS providers should be as smooth as possible, especially when scaling fast. Here's how migration compares between Klaviyo and Postscript.

Klaviyo:

• One-click migration for flows, contacts, consent, and opt-ins.

• Built-in migration guides make it easy to switch from SMS-only platforms like Postscript or Attentive.

• Supports automatic setup of flows and triggers within minutes.

Postscript:

• Requires manual re-tagging of contacts and rebuilding of message templates.

• No native migration support for flows, meaning longer setup time if you run complex automations.

Use Cases: What Brands Use Each Tool Best?

Choosing the right tool depends on your marketing goals and how you plan to use SMS within your retention strategy.

Klaviyo:

• Perfect for brands looking to scale email and SMS together for unified campaigns.

• Popular across industries like fashion, beauty, CPG, wellness, and subscriptions.

• Supports brands focusing on lifetime value growth, not just one-off sales.

Postscript:

• Best suited for brands that run flash sales, viral product drops, or need quick, SMS-only campaigns.

• Works well for lean teams who want fast turnarounds without building full lifecycle journeys.

Brands using Klaviyo can seamlessly combine SMS with abandoned checkout flows to recover more carts. Learn how to set this up in our guide to Klaviyo Abandoned Checkout tactics.

Limitations of Each Tool

While both Klaviyo and Postscript offer strong SMS capabilities, each has its limitations depending on how your brand plans to grow.

Klaviyo:

• Longer SMS setup if you're new to Klaviyo and not already using it for email.

• Higher learning curve for teams leveraging advanced segmentation or multi-channel flows.

• It may require more time upfront to unlock its cross-channel potential fully.

Postscript:

• No email capabilities, meaning you’ll need an additional platform if you want to expand beyond SMS.

• Limited analytics compared to Klaviyo—no predictive metrics like churn risk or LTV forecasting.

• Focuses mainly on short-term campaign tracking without deeper customer journey insights.

Final Verdict & Decision Checklist

Choosing between Klaviyo and Postscript comes down to your growth strategy, tech stack, and retention goals.

You should choose Klaviyo if:

• You’re already using Klaviyo for email, or plan to run multi-channel campaigns that combine SMS and email.

• You need Customer Lifetime Value (LTV) insights, smarter segmentation, predictive analytics, and a unified reporting dashboard.

• You want the flexibility to build advanced automation flows across multiple customer touchpoints.

You should choose Postscript if:

• You only need SMS marketing and prefer a lean, fast setup without the complexity of multi-channel journeys.

• You are a brand heavily invested in SMS, running large-scale flash sales, viral product drops, or time-sensitive promos.

• You value a platform optimised purely for high-volume, SMS-first communication without extra features you might not use.

If your brand is scaling quickly and you want to future-proof your CRM strategy, Klaviyo offers more long-term flexibility. If SMS is your primary and urgent focus, Postscript is a faster lift.

FAQs

1. Can I use both Klaviyo and Postscript together?

•  Yes, many brands use Klaviyo for email and Postscript for SMS, but integration and syncing may require extra setup.

2. Which platform is better for international SMS?

• Klaviyo supports global SMS with region-specific pricing. Postscript is US/Canada-focused, with limited international capabilities.

3. Do both platforms support MMS (images, GIFs)?

• Yes, both Klaviyo and Postscript offer MMS, though pricing and message formatting vary slightly.

4. Can I A/B test SMS messages?

• Klaviyo supports A/B testing within flows. Postscript offers testing at the campaign level but with fewer variables.

5. Which tool is easier for beginners?

• Postscript has a simpler setup for SMS-only use. Klaviyo takes longer to learn but rewards deeper use cases.

Conclusion

Choosing the right SMS tool depends on where your brand is now and where you want it to go. If you’re focused purely on quick SMS wins and rapid campaign launches, Postscript keeps things simple and effective. 

However, if your brand is scaling and you’re investing in lifetime value, predictive analytics, and multi-channel journeys, Klaviyo provides a unified view of your customer that Postscript can’t match. The best choice isn’t just about cost—it’s about which platform will help you unlock more value from every message sent.

Key Takeaways

• Power & Flexibility: Klaviyo supports advanced flows, email + SMS, and predictive data.

• Speed & Simplicity: Postscript offers fast setup and strong SMS-only performance.

• Data Depth: Klaviyo provides unified analytics, revenue attribution, and LTV tracking.

• Use Case Fit: Choose Klaviyo for long-term growth; pick Postscript for SMS-first flash campaigns.

• Pricing Structure: Klaviyo bundles email + SMS credits; Postscript charges based on usage.

Unsure whether Klaviyo or Postscript is right for your SMS strategy?

Our team will audit your current setup, identify gaps, and recommend the best-fit platform for scaling your retention. Click here to book your free CRM audit now.