How Much Does Postscript Cost? The Real DTC TCO (2026)

If you run a Shopify brand and you are pricing out SMS marketing, Postscript's pricing page gives you a comforting first number: $0 per month to start. That headline is true and almost useless for budgeting. Postscript (an SMS marketing platform built for ecommerce, where you text your subscribers campaigns and automated flows) bills the way most usage-based tools do, and the real number on your invoice is the sum of four things, not one.

This post gives you the actual total cost of ownership, or TCO: the platform fee, the per-message rate, the carrier passthrough fees Postscript does not lead with, and the add-on stack (MMS, international, short codes, managed service). We model it by tier and at three GMV bands so you can budget the real number, not the $0 one. All rates are from Postscript's pricing and help docs, accessed June 2026.

Postscript's four pricing tiers: what you pay for the platform itself

Postscript sells four tiers, and the platform fee is only the entry ticket. Starter is $0/month with a $49 minimum spend, Growth is $100/month, Professional is $500/month, and Enterprise is custom. Each step up buys you a slightly lower per-message rate plus features: Growth adds unlimited opt-in keywords and live support, Professional adds enhanced analytics, API access, priority support, and removes the "Powered by Postscript" branding, and Enterprise layers on an onboarding specialist and data-warehouse push.

The table below is the platform layer only. It is the number most pricing reviews stop at, which is exactly the mistake.

The thing to notice is how small the rate differences are. Moving from Starter to Professional saves you $0.002 per SMS. On 100,000 messages that is $200, against a $500 base fee jump. When I talk to founders running brands at this size, the instinct is to assume the expensive plan is the "serious" one and upgrade early. The rate math says wait: the higher tier only earns its base fee at real volume, and most brands cross that line later than they think.

The number Postscript does not lead with: carrier passthrough fees

Every Postscript invoice has two cost lines, not one. There is the platform and message fee, and there is the carrier fee. The carrier fee is a passthrough charge from the mobile carriers (Verizon, AT&T, T-Mobile, US Cellular) for delivering application-to-person messages, and Postscript bills it at cost with no markup. The US average works out to about $0.00418 per SMS and $0.00841 per MMS, though it varies by carrier.

That fee is small per message and large in aggregate. It does not change with your plan tier, which means it is a flat tax on volume that the headline plan price never shows. The all-in per-message cost is what actually hits your card:

So Starter SMS is not $0.009, it is $0.0132. That is a 46 percent premium over the rate you budgeted from. The pattern we see again and again is a brand that modeled SMS at the platform rate, then opened the first invoice and found it 40-plus percent over plan. There is no overage penalty buried here. It is just the carrier line nobody read.

MMS, international, and short codes: the add-on cost stack

Once you are past the per-SMS rate, three add-ons drive the real spread between brands. The first is MMS. A multimedia message (any send with an image, GIF, or enough emoji to upgrade it) costs 3 to 5x an SMS at every tier: about $0.053 all-in on Starter against $0.013 for SMS. The trap is that MMS can trigger automatically. Drop a product image or a few emoji into a campaign and Postscript upgrades it to MMS, and your cost-per-send quietly quadruples. If your subscriber list is large, audit how many of your "texts" are actually MMS before you assume your blended rate.

The second is international. Postscript charges about $0.25 per international SMS on Starter, Growth, and Professional, roughly 27x the domestic rate, and MMS is not supported outside the US, Canada, and Puerto Rico. If even 5 percent of your list is international, that slice can cost more than your entire domestic send.

The third is infrastructure. The default dedicated toll-free number is included free on every plan. A dedicated short code is $750/month, passed through at cost, and is only worth it for programs sending millions of messages a month. There is also 10DLC, or A2P brand registration (the carrier compliance step that lets you send marketing texts at all), which runs an industry-standard $15 to $30/month in passthrough fees, though Postscript does not publish its specific number.

TCO by GMV band: what Postscript actually costs at $500K, $2M, and $5M

Now stack the layers into one monthly number. The model below takes three brand sizes, puts each on the tier that fits its volume, and adds platform fee plus SMS cost plus MMS cost plus carrier fees. The formula is simple enough to run yourself: platform_fee + (SMS volume x platform SMS rate) + (MMS volume x platform MMS rate) + carrier fees on both.

Two things fall out of this. First, the carrier-fee line is roughly a quarter to a third of the total at every band, which is why ignoring it wrecks a budget. Second, the breakeven between Growth and Professional sits around 400,000 messages a month. Below that, Growth's $100 base beats Professional's $500 base even though Professional's per-message rate is lower (at 100,000 messages, Professional costs about $300/month more than Growth). Above 400,000 messages, the rate saving finally flips the math. When we work through this with operators, the moment that lands is realizing the plan they should be on is set by send volume, not by revenue or ego. A $5M brand sending lightly can sit happily on Growth; a $1M brand with an aggressive automation program might already justify Professional.

Postscript Plus and agency costs: the layer most reviews skip

Here is the part that dwarfs everything above. Postscript Plus is the managed-service offering, with three tiers (Launch, Essentials, Signature) and no public pricing: it is contact-sales only. Beyond Postscript's own service, most mid-market brands run SMS through an agency or a fractional operator, and those retainers commonly land at $3,500 to $8,000/month for a brand in the $2M to $20M range.

Put that next to the platform numbers. The $2M brand above pays about $1,138/month for the Postscript platform itself, and could pay $3,500-plus on top for someone to actually run it well. The software is the cheap layer. The expensive layer is the human or agency time, and it is the line most "Postscript pricing" articles leave out entirely. When I talk to founders deciding whether to bring SMS in-house, the honest framing is this: if your platform bill is $1,000/month and your agency bill is $5,000/month, the question is not "is Postscript expensive," it is "is the program returning 6x its all-in cost." Often it is, but you have to look at the whole stack to know.

Is Postscript worth it? Benchmarking cost against revenue

Cost only means something against the revenue it returns, and here Postscript's own 2026 benchmark data is the useful anchor. Across all message types, brands see $0.41 to $4.54 in revenue per message at the 25th to 75th percentile. Automations do the heavy lifting: abandoned-cart flows run $3.52 to $10.95 per message, while one-off campaigns drive only $0.11 to $0.55. Subscriber lifetime value spans $25 to $553 depending on the program.

Run the math on the $2M brand on Growth. Say it has a 10,000-subscriber list and sends four campaigns a month plus standard automations. Even at a conservative blended $0.50 to $1.00 revenue per message, the automation-plus-campaign volume that produces a ~$1,138 platform bill should generate well over that in SMS-attributed revenue, before you count the cart and browse flows that earn $3-plus per message. The platform cost is rarely the thing that decides whether SMS pays. The thing that decides it is whether your automations are actually built and your list is actually engaged.

The headline $0 plan is the least useful number in Postscript's pricing. The real budget is platform fee plus per-message rate plus a carrier passthrough line that runs 40-plus percent on top, and for most brands the biggest cost is not the software at all, it is the agency or in-house time to run it. Model the whole stack against revenue per message, and SMS usually pencils. Model just the $0 headline, and you will be wrong by an order of magnitude.

If you are sizing this against the rest of your retention stack, Postscript's public $0 to $500/month tiers sit well below Attentive's negotiated $500 to $5,000+/month base and Klaviyo's bundled email-plus-SMS model. The right platform depends less on headline price and more on which send volume and feature set fits your program.

Sources and methodology

All Postscript rates in this post come from Postscript's published pricing page and help-center documentation, accessed June 2026. Platform fees and per-message SMS and MMS rates for the Starter, Growth, and Professional tiers, along with the $49 Starter minimum spend, are from postscript.io/pricing. Where the pricing page showed both a struck-through legacy rate and a current rate, we used the current (non-struck-through) figure throughout, for example $0.009 per SMS on Starter rather than the older $0.015.

Carrier passthrough fees ($0.00418 average per SMS, $0.00841 average per MMS) are from Postscript's "Understanding Carrier Fees" help article, which publishes a per-carrier breakdown for US and Canadian networks. These are billed as a separate invoice line at cost. International SMS pricing ($0.25 per message, MMS unsupported outside the US, Canada, and Puerto Rico) is from Postscript's "Understanding International Sending Costs" article. The dedicated short code cost ($750/month) and the free toll-free-number default are from Postscript's short-code-versus-toll-free help article.

The TCO model is an Eightx calculation built on those published rates. For each GMV band we assigned the tier most brands at that size run, estimated a representative SMS and MMS volume, and summed platform fee, message cost, and carrier fees. The numbers are planning estimates, not quotes: your real bill depends on your exact send volume, SMS-to-MMS mix, and international share. Re-run the formula with your own numbers before you budget.

Two figures carry caveats. Postscript does not publish its specific 10DLC passthrough fee, so the $15 to $30/month range is from third-party A2P registration data (TCR standard brand registration plus campaign fees), not Postscript itself. And Postscript Plus managed-service pricing is genuinely contact-sales only, so we publish no dollar figure for it; the $3,500 to $8,000/month range is for independent agency or operator retainers, which is a separate cost from Postscript's own service. Revenue-per-message and subscriber-LTV benchmarks are from Postscript's 2026 SMS Benchmarks report. For help modeling any of this against your P&L, our interim CFO services team does exactly this kind of stack-versus-revenue work.

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