For a Shopify brand, Postscript is the SMS platform I recommend. Its pricing is public and self-serve, it starts at $0 a month with a $49 minimum, and the model keeps the list and the data in your hands. Attentive runs a strong managed program, but its pricing is quote-based, so you are comparing a known number to a proposal.
- SMS cost has three layers: a platform fee, a per-message rate (about $0.007 to $0.009 per SMS on Postscript), and carrier pass-through fees averaging near $0.004 per SMS.
- Postscript publishes every layer; Attentive quotes, usually with annual commitments.
- Real SMS spend runs well above the base rate once per-message and carrier fees stack, so budget all three layers.
SMS is one of the best channels a consumer brand can run, and its pricing is one of the most confusing to compare. That is not an accident. When a cost is genuinely hard to read, the buyer stops shopping on price and starts shopping on the sales relationship, which is exactly where an opaque quote wants you. So the useful thing a comparison can do is make the cost legible, then let the better model win on its merits.
I will tell you where I land up front, because I have no interest in fake suspense. Postscript is a platform I genuinely like and recommend for Shopify brands, and this post lands there. Attentive is the honest comparison point, a serious company running a serious managed model, and I will represent it fairly. But the reason I point Shopify brands to Postscript is not a feature checklist. It is the model: transparent, self-serve, and built so the brand owns the relationship. Once you can see the numbers clearly, that model is easy to prefer.
SMS pricing is hard
to compare on
purpose.
Ask two brands what they pay for SMS and you will get two answers that cannot be lined up, because the number depends on how many messages they send, what those messages cost per send, what plan minimum they carry, and what the carriers charge on top. There is no single sticker to compare, which is why "Attentive vs Postscript" is a genuinely useful search and why most articles answering it stay vague.
Compare this to a channel like email, where the list-size tiers are published and legible. Klaviyo's ladder, which we lay out in the Klaviyo pricing decoder, is a stepped number you can model in a spreadsheet before you sign. SMS has never been that clean, because the underlying cost structure genuinely is more complex, and because at least one of the big platforms has chosen to keep it behind a quote.
That complexity is the opportunity. The brand that understands the three cost layers can model its true bill, negotiate from knowledge, and pick the platform whose economics actually favor it. The brand that does not understand them signs a proposal, discovers the real number in month three, and spends the next year trying to make the channel pencil out. This post is here to put you firmly in the first group.
Every SMS bill is
built from exactly
three layers.
Decode SMS cost into three layers and it stops being mysterious. Every platform charges some mix of the same three things, and once you can name them, you can compare any two providers honestly, including the one that only gives you a quote.
Layer one, the platform fee. This is the monthly subscription for the software itself: the sending engine, automations, segmentation, list-growth tools, and analytics. On Postscript this is published and low to start: the Starter plan is $0 a month with a $49 monthly minimum spend, Growth is $100 a month, and Professional is $500 a month (Postscript pricing page, 2026). The platform fee is the layer buyers fixate on, and it is usually the smallest of the three at any real send volume.
Layer two, the per-message rate. This is what you pay the platform for each text it sends, and it is where volume shows up. On Postscript the SMS rate falls as you move up plans, from about $0.009 per SMS on Starter to roughly $0.008 on Growth and about $0.007 on Professional, with MMS (image messages) running higher, around $0.024 to $0.045 depending on plan. Higher plans cost more per month but less per message, which is why the right plan depends entirely on how much you send.
Layer three, carrier pass-through fees. This is the layer brands forget, and it is unavoidable regardless of platform. The mobile carriers charge a fee on every message that crosses their networks, separate from your platform rate. Postscript states the averages openly: about $0.00418 per SMS and $0.00841 per MMS in the US, and it bills them at cost with no markup (Postscript pricing page, 2026). That is the honesty that matters: a platform that shows you the carrier line at cost is not hiding margin inside it.
Stack the layers and the picture is clear. On Professional, a single promotional SMS costs roughly $0.007 to the platform plus about $0.004 to the carrier, so call it $0.011 all-in, before the monthly fee. Send to a list of 100,000 and that one campaign is over $1,000 in variable cost alone. The lesson is the same one the Shopify app pricing benchmarks keep proving: the sticker is the smallest number on the page, and the usage layers decide your real bill.
"A platform that shows you the carrier fee at cost is not hiding margin inside it. That transparency is the whole reason to prefer Postscript."
Attentive's managed
model vs Postscript's
self-serve one.
Attentive and Postscript are both capable SMS platforms, and the deepest difference between them is not a feature, it is the buying model. Attentive is built around a managed, enterprise-style relationship: pricing is quote-based rather than published, engagements often come with annual commitments, and a good deal of the strategy runs through the vendor's team. For a large brand that wants a partner to run the channel, that model has real appeal, and Attentive executes it well.
Postscript is built the other way, around transparent self-serve. The pricing is public, you can start on the low monthly minimum, and you run the program yourself with the platform's tooling and support behind you. There is a managed option if you want expert help, but the default posture is that the brand is in the driver's seat. For the vast majority of Shopify brands, that posture is the better fit, because it keeps knowledge, control, and economics inside the company.
The distinction matters most when you try to answer a simple question: what will this cost me next year at double the volume? With Postscript you open the pricing page and model it. With a quote-based model you ask, wait, and receive a proposal shaped by what the vendor knows about your business. Neither is dishonest, but only one lets you run the math yourself before you commit, and that habit is one I want every brand I advise to keep.
The best SMS model
is the one where the
brand owns the list.
Here is the part that decides it for me. Your SMS subscriber list is one of the most valuable assets a consumer brand builds, because it is a permission-based, direct line to your best customers that no algorithm sits between. The question that should drive your platform choice is who that asset really works for: you, or the vendor. Postscript's model answers that cleanly in the brand's favor.
With Postscript you own the subscriber list, you own the data, and you own the economics of the channel. The pricing is legible, so you can see exactly what each incremental message and each incremental subscriber costs you, and you can make the ROI call yourself. That ownership is not a slogan; it changes how you run the channel, because you optimize for your margin rather than for a number on someone else's dashboard. It is the same principle I apply to Klaviyo flows for Shopify brands: own the automation, own the data, own the relationship.
This is also why SMS and email belong in the same strategy rather than in a vendor silo. If you are still deciding how much weight to put on texting versus email in the first place, that channel-level call is the subject of email vs SMS for DTC; this post is about the platform cost once you have decided SMS is in the mix. On the platform question, the brand-owns-the-relationship model wins, and Postscript is the clearest expression of it.
The pricing, laid out
as honestly as it
can be.
Below is the comparison in one place. Postscript's figures are pulled from its public pricing page. Attentive's are marked quote-based, because that is the honest state of the information: Attentive does not publish list pricing, and any number you see quoted for it in a third-party post is a guess. The verdict row is the recommendation, not a scorecard tie.
| Dimension | Postscript | Attentive |
|---|---|---|
Pricing model | Published, self-serve, plan plus usage | Quote-based, managed, sales-led |
Platform fee | Starter $0/mo ($49 min) · Growth $100/mo · Professional $500/mo | Not published; custom quote |
Per-message (SMS) | ~$0.009 (Starter) to ~$0.007 (Professional) | Not published; typically bundled into the quote |
Carrier pass-through | ~$0.004/SMS, ~$0.008/MMS, billed at cost | Applies to all providers; disclosure varies |
Contract | Start free trial, month-to-month path available | Commonly annual commitment |
Who owns the relationship | The brand: list, data, and economics stay yours | Managed alongside the vendor's team |
Best fit | Shopify brands wanting transparency and control | Large brands wanting a fully managed program |
Verdict | Recommended for Shopify brands | Honest comparison point |
Read the grid and the reason for the recommendation is right there in the first column: on Postscript, every cost line is a real number you can see and plan around, and the relationship stays with the brand. That is not a knock on Attentive, which is genuinely strong at the managed, enterprise end. It is a straightforward statement that for a Shopify brand that wants to understand and own its own channel, Postscript's model is the better one.
The pick, stated
plainly: Postscript.
When you strip SMS down to what you are actually buying, you are buying deliverability, compliance, and a durable direct line to your customers. Postscript delivers all three, prices them in the open, and hands you the keys to the relationship. That combination is why it is the platform I recommend to Shopify brands, and why I have been happy to see it become the default for so many of them.
The practical path is clean, too. Start on the low monthly minimum, prove that SMS clears its cost against real revenue, and let the per-message rate fall as you grow into the Growth and then Professional tiers. Because you can see every layer of the bill, you always know whether the channel is earning its place, which is exactly the discipline a healthy program needs. You are never guessing whether the number makes sense, because the number is right in front of you.
If you want a broader view of where SMS sits in a well-run app stack and what the neighboring tools cost, the app pricing benchmarks put it in context, and the reviews side of the stack gets the same transparent treatment in the cheapest Shopify reviews app breakdown. Across all of them the lesson repeats: pick the tool whose costs you can read, and Postscript is that tool for SMS.
SMS pricing is confusing by design, but it is not actually complicated once you name the three layers. Platform fee, per-message, carrier pass-through. Postscript shows you all three and lets you own the outcome. That is the transparent, brand-first model, and for a Shopify brand it is the right one. The recommendation is Postscript, without hedging.
Questions brands ask
about SMS pricing.
Q: How much does Postscript cost?
Postscript publishes its pricing openly. The Starter plan is $0 a month with a $49 monthly minimum spend, at about $0.009 per SMS and $0.045 per MMS plus carrier fees. Growth is $100 a month at roughly $0.008 per SMS, and Professional is $500 a month at about $0.007 per SMS, with Enterprise quoted. Carrier pass-through fees average around $0.004 per SMS and are billed at cost. Because the rates are published, a Shopify brand can model its true bill before signing, which is the whole point.
Q: Is Postscript better than Attentive?
For most Shopify brands, yes, and mostly because of the model rather than any single feature. Postscript is transparent and self-serve: pricing is published, you own the subscriber list and the data, and you run the program yourself. Attentive runs a strong managed model, but its pricing is quote-based and typically wrapped in annual commitments, so you compare a known number against a proposal. When you own the relationship and can see every cost line, you make better decisions, which is why I land on Postscript for Shopify brands.
Q: What are SMS carrier fees?
Carrier fees are pass-through charges the mobile carriers levy on every message that crosses their networks, separate from what your SMS platform charges. In the US they average roughly $0.004 per SMS and about $0.008 per MMS, and they apply on top of your per-message platform rate. Postscript bills these at cost with no markup and states the averages openly on its pricing page. Carrier fees are the layer most brands forget when they budget, and they are why real SMS spend runs well above the advertised base rate.
Q: Why choose Postscript for Shopify SMS?
Postscript is built around Shopify and around the brand owning the relationship. The pricing is public, the platform is self-serve, and the subscriber list and data stay yours, which means the economics work for you rather than for the vendor. You can start on a low monthly minimum, prove ROI, and scale the per-message rate down as you grow into the Growth and Professional tiers. For a Shopify brand that wants control, transparency, and a clean path from first text to a top revenue channel, Postscript is the platform I recommend.
Setting up SMS the right way?
I have run SMS and email across the brands I have operated and advised, negotiated the contracts, and paid the carrier fees. If you want help modeling your true SMS cost, choosing the plan that fits your send volume, or building the flows that make the channel pay, reach me at hello@taylorsicard.com or start a conversation below.
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