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Most buyers should pick Klaviyo.
Choose Klaviyo for email-led marketing, customer data and a wider channel mix: its free plan covers up to 250 active profiles, and paid Email starts at $20/month. Choose Postscript when SMS retention is the priority. Its Starter plan is listed at $0/month but requires a $49 monthly minimum spend, plus message and carrier fees; Growth starts at $100/month. Klaviyo’s pricing scales with profiles and add-ons, while Postscript’s AI Plan costs $699/month. Neither publishes seat pricing.
01Side by side
| Klaviyo | Postscript | |
|---|---|---|
| Starting price | Free; paid Email starts at $20/month | $0 Starter; $49 monthly minimum spend |
| Free plan | 250 profiles, 500 email sends/month | Starter plan, with $49 monthly minimum spend |
| Best for | Email, SMS and broader customer-data marketing | SMS-first retention marketing |
| Core strength | Real-time customer data and omnichannel messaging | SMS marketing and AI-powered shopper journeys |
| Learning curve | Not published; broader platform scope | Not published; SMS-focused platform |
| Integrations/data | Real-time data platform; 400+ integrations | API access on Professional; data warehouse push on Enterprise |
| Team/seat costs | Seat pricing not published; plans scale by profiles | Seat pricing not published; message fees apply |
| Support | Free-plan email support for first 60 days | Live chat and email on Growth; priority on Professional |
Klaviyo Choose Klaviyo if
- Choose Klaviyo if you need email plus SMS in one platform.
- Choose Klaviyo if real-time customer profiles and 400+ integrations matter.
- Choose Klaviyo if you want a free plan without a listed minimum spend.
Postscript Choose Postscript if
- Choose Postscript if SMS is your main retention channel.
- Choose Postscript if you want SMS pricing tiers and unlimited segments.
- Choose Postscript if you need RCS as an Enterprise option.
02Pricing compared
Klaviyo has the lower published entry price for email: its Email plan starts at $20/month for 251–500 active profiles. A free plan covers up to 250 profiles, but caps email at 500 sends a month and mobile messages at $5 in value. The pricing page lists monthly billing and no annual discount.
Postscript’s Starter plan is listed at $0/month, but requires a $49 monthly minimum spend. SMS and MMS are charged per message, with carrier fees on top. Growth starts at $100/month; the AI Plan is $699/month. Postscript lists a 30-day free trial, but not annual pricing. Klaviyo’s price scales with profiles and, for SMS, credit volume; Postscript’s costs depend on message type and volume. Neither publishes seat pricing.
03Features and depth
Klaviyo is the broader customer-marketing platform. Its Data Platform unifies behavioral, transactional, and engagement data, and its messaging spans email, SMS, RCS, WhatsApp, and mobile push. The product also lists 400+ integrations. Composer plans campaigns for marketer approval, while Customer Agent is described as resolving 65% of support questions on the homepage.
Postscript is centered on retention marketing, especially SMS. Its feature set includes subscriber capture, list segments, SMS and RCS messaging, email, and AI-powered shopper journeys. Infinity Testing is positioned to optimize messages across tests. The Postscript AI Plan includes Brand Center, Infinity Testing, and Shopper; those products are not included in the $0 Starter plan. Professional includes API access for custom integrations, while Enterprise can add RCS. In short, Klaviyo covers more channels and customer-data use cases; Postscript’s published feature set puts more emphasis on SMS campaigns and retention journeys.
04Ease of use and learning curve
The product descriptions suggest different kinds of complexity. Klaviyo brings customer data, segmentation, integrations, and several messaging channels together, so teams using more than email may need to plan how profiles and campaigns fit together. Its 400+ integrations may help connect an existing stack, but the source does not specify setup effort.
Postscript’s narrower SMS focus may be easier to map to an SMS program, but its costs involve message rates, carrier fees, and minimum spend. Its Growth plan lists live chat and email support; Professional adds priority support. Neither product’s published material publishes onboarding time or seat limits, so we would not treat either as a guaranteed quick setup.
Questions people ask
Is Klaviyo or Postscript cheaper?
For email-led marketing, Klaviyo starts at $20/month for 251–500 active profiles, and it has a free plan for up to 250. Postscript Starter is listed at $0/month but requires a $49 minimum monthly spend, with message and carrier fees. Actual costs depend on usage.
Does Postscript charge for SMS separately?
Yes. Postscript lists per-message SMS and MMS rates, and carrier fees pass through at cost. Starter lists $0.009 per SMS and $0.045 per MMS, plus carrier fees. Growth and Professional have lower listed message rates, but still add carrier fees.
Can I use Klaviyo for SMS and email?
Yes. Klaviyo’s Email and SMS plan starts at $35/month for 251–500 profiles and bundles 1,250 SMS/MMS credits. The plan scales with profile count and selected credits, and additional messages can incur destination-country rates. Klaviyo also lists RCS, WhatsApp, and mobile push.
What does Postscript’s AI Plan include?
The Postscript AI Plan is listed at $699/month and includes Brand Center, Infinity Testing, and Shopper. It also lists per-message rates from $0.003 to $0.30, depending on product and message type. Postscript does not publish annual pricing in the published pricing details.