Companies Using Postscript

SMS marketing pages usually come with an awkward question: whose account is the tag running under? Postscript's answer is clean. Our October 2026 crawl finds its SDK on 17,227 domains, 1st in SMS Marketing, and we matched 3,804 to a company. When I checked a random 100 of those stores in a browser on 16 October, every install carried the store's own Postscript ID. Below: who those merchants are, and where they overlap with rivals.

Every store runs its own account

Of the 100 stores, 91 showed a Postscript shop ID in the page. The IDs were all different, apart from one brand using the same ID on two of its own domains, and Postscript's API returned settings, with the right store name, for every one. Random IDs mostly return nothing (21 of 24 did), so that is a real check, not an API that answers everything. The rest of the sample: 6 stores didn't load, 1 showed Shopify's "Store unavailable" page and 2 had no ID we could see. 13 of the 100 were password-protected stores, which still count.

Sales signal: each domain here is a merchant with its own Postscript account and its own SMS budget. There is no agency fleet to filter out first.

A big, flat base

Our monthly counts read 13,779 in June, 18,034 in July and 17,227 in October. The June-to-July step is ours: the domains we cover and the signals we detect Postscript with both changed, and the set of domains we crawl turns over every month, dead stores out and new ones in. Since July the line has eased by about 800. Exits are real but smaller than the raw number: 4,899 domains stopped showing Postscript since 16 March 2026, and when I rechecked, 563 of them still ran it on another hostname.

"Postscript is the rare SMS tool where the count and the customer list line up. Each store carries its own account, so its 17,227 domains are thousands of separate merchants." - Sophie Clarke, Product Marketing Manager at TechnologyChecker.io

Sales signal: treat Postscript as a mature, large installed base rather than a fast-growing one. The interesting movement is at the edges, among stores leaving other SMS tools.

Young brands with small teams

70.84% of matched companies with a known size have 1 to 10 staff, and 81% were founded in 2010 or later (56.55% in the 2010s, 24.45% in the 2020s). That is the profile of a direct-to-consumer brand, and the names bear it out: Ruggable, Dr. Squatch, Ridge, The Black Tux, Kosas, ButcherBox. Postscript's own customer page shows Dr. Squatch, Ridge and Ruggable among its logos, and our crawl finds all three with live shop IDs. A handful of larger companies use it too: Steve Madden and New Era Cap on their main stores, Blue Bell Creameries on its ice-cream shipping site and EquipmentShare on its parts store. Postscript says more than 20,000 brands use it; our 17,227 domains count live stores, and some brands have several addresses, such as one air-purifier maker's 108 forwarding domains.

Sales signal: filter on revenue signals rather than headcount. A 10-person Shopify brand on Postscript can be a serious account.

An American product, by design

3,151 of the 3,804 matched companies are in the United States (82.83%), with Canada a distant second at 203. Postscript's pricing page fits that: its listed per-message rates are for the US and Canada, with international sending priced separately. Industry is consumer goods throughout. Retail apparel and fashion leads at 18.59%, general retail follows at 16.47%, then manufacturing, wellness, food and beverage, and personal care.

Sales signal: for anyone selling to SMS-led brands outside North America, this list is mostly the wrong market; inside the US it is a dense map of Shopify fashion and beauty brands.

Where switching shows up

One flow passes all our switching tests. Since March 2026, 777 domains dropped Yotpo SMSBump and kept Postscript, 696 of them in the last 90 days, with none going the other way. Yotpo explains the timing: it set full deprecation of its email and SMS products for 31 December 2025 and recommended Attentive and Omnisend as replacements. Postscript wasn't on that list, yet it is where these stores are now. Most probably moved earlier and are only now removing the dead SMSBump tag. Yotpo's reviews and loyalty products carry on, and Yotpo Reviews keeps its own page.

Attentive is the real rival. Today 257 Postscript domains also show Attentive, out of 495 that ever showed both. With about half that overlap still running both, the movement between them doesn't pass our tests as a switch in either direction.

"Yotpo told its SMS customers to go to Attentive or Omnisend. Our crawl shows 777 of them ended up on Postscript, and none went back." - Sophie Clarke, Product Marketing Manager at TechnologyChecker.io

Sales signal: stores that still carry both Postscript and Attentive are mid-evaluation. They are the warmest list here for either vendor.

Shopify first, Klaviyo next to it

Shopify runs on 99.89% of the 16,783 domains in our stack base, so Postscript is a Shopify product in practice. Klaviyo shows on 45.32%, and Postscript integrates with it, although Postscript is now rolling out its own email product, which puts the two in more direct competition. Google Analytics is on 48.74%. The common Shopify apps beside it are Instafeed (15.02%) and Hextom (8.12%), a typical small fashion-store stack.

Sales signal: most accounts here also run a separate email tool. Anyone selling email to these stores is selling into a Klaviyo account about half the time.

What Postscript charges, and what that implies

Postscript's pricing page (read 16 October 2026) lists a Starter plan at $0 a month with a $49 monthly minimum spend, Growth at $100, Professional at $500 and custom Enterprise pricing, with SMS rates from $0.009 down to $0.007 a message plus carrier fees. A $49 floor suits the 1-to-10-person stores that dominate our list. Y Combinator lists Postscript as founded in 2018, from its Winter 2019 batch.

Sales signal: the entry price is low enough that many of these accounts are small. Size the opportunity from store traffic or product range, not from the fact that a store runs Postscript.

Key takeaways

1. 17,227 domains, 46.93% of SMS Marketing and 1st of 10, ahead of Attentive (13,145).

2. Every sampled store runs its own Postscript account; no agency or platform fleet.

3. Small, young and American: 70.84% have 1 to 10 staff, 81% were founded in 2010 or later, 82.83% are in the US.

4. 777 domains left Yotpo SMSBump and kept Postscript after Yotpo's shutdown.

5. 99.89% run Shopify and 45.32% run Klaviyo for email.

How to use this list

Start with the 257 stores running Postscript and Attentive together, then the SMSBump leavers. For the full list of 17,227 Postscript domains with company, size and stack data, explore TechnologyChecker.io. Our guide to technology detection methods explains how we read a script's account ID to tell a merchant's install from an agency's.