Mailchimp vs Postscript for Shopify Stores in 2027

The short answer: pick by the channel that earns your repeat revenue

Pick Postscript if your store makes most of its repeat revenue from text messages and you run on Shopify. Pick Mailchimp if email carries that revenue and SMS would be a supplement you add later. Both tools can send texts, so the real split is what each product is built around and how its bill grows with your list.

TL;DR: Choose Postscript for SMS-led retention on Shopify, and Mailchimp for email-led marketing with an SMS add-on. Confirm current pricing on both vendor pages before you commit, because both vendors change plan prices often and Postscript adds carrier fees on top, so this guide compares how each bill is built rather than printing figures that may be out of date.

One status check comes first. Mailchimp is no longer an independent company: Intuit closed its acquisition of Mailchimp in 2021, paid partly in 10.1 million Intuit shares, according to U.S. Securities and Exchange Commission (2021). Its current Shopify listing names Intuit Mailchimp as the developer. Postscript shows no rename, merger or discontinuation in the pages reviewed; its Shopify listing and pricing page present it as a current, standalone product.

Key Takeaways

• Postscript is an SMS and MMS platform built around Shopify, with listed flows for cart recovery, welcome messages and win-back campaigns.

• Mailchimp is an email-first platform owned by Intuit. It sells SMS as an add-on in select countries, with credits sold in blocks that renew monthly.

• Postscript's bill tracks the messages you send, plus carrier fees. Mailchimp's bill tracks the contacts you store, plus any SMS credits you buy.

• Shopify app-store ratings are close for both products, so ratings will not decide this choice.

• Consent records, opt-out handling and carrier rules apply whichever tool you pick, so budget time for them before launch.

• Model your own contact and message counts before comparing plan tiers, because the headline tier hides the cost driver.

What each product is and who it is built for

SMS marketing means sending promotional texts to shoppers who have opted in, usually through a platform that stores consent, handles opt-out keywords and bills per message. An email platform such as Mailchimp treats SMS as a channel added to an email program. An SMS-first platform such as Postscript puts the text workflow at the center.

Postscript's Shopify listing describes campaign tools that include A/B testing, bulk and scheduled messaging, two-way messaging and segmentation. Its workflow list covers cart recovery, welcome messages, win-back campaigns and one-time passwords, and its reporting covers conversion metrics and ROI tracking. Those are the features to test against your current text flows.

Mailchimp's Shopify listing presents the product as email-led. It lists automated welcome, abandoned cart and back-in-stock emails, segment sync for email and SMS, single-use discount codes and attributed revenue tracking in Shopify. The same listing says SMS is available as an add-on, which shows where SMS sits in the product's design.

How we evaluated these tools

This is an informed buyer's guide built from public pages: vendor pricing and feature pages, Shopify App Store listings, a securities filing, primary statute text, a 2026 law-firm commentary on carrier rules, and public API documentation. We did not run either product in a live store. The weights below are our own analysis of what an owner or operations lead has to decide. They are not vendor data.

The weights sum to 100%. Channel fit and pricing model carry the most weight because they decide whether a tool matches how your store earns repeat revenue and how the bill changes as the list grows.

Feature matrix for the decisions that matter

The keyword count and the Mailchimp free-plan cap are covered with citations in the next section. A feature that is absent from a public page is marked "not shown" rather than treated as absent from the product.

Pricing and total cost, checked November 13, 2026

Pricing checked November 13, 2026. Both vendors change plan prices often and Postscript adds carrier fees on top, so this guide compares how each bill is built rather than printing figures that may be out of date. Read current pricing directly at Postscript pricing and Mailchimp pricing before you build a cost model.

Mailchimp Free plan: 250 contacts, no SMS according to Mailchimp (current page). The same page says SMS is an add-on to paid plans in select countries, and that its credits renew monthly while unused credits expire.

The Postscript entry tier includes 2 opt-in keywords, and the next tier lists unlimited keywords, according to Postscript (current page). The same page lists per-message SMS and MMS rates plus carrier fees, and it describes an Enterprise tier with custom pricing.

The cost model matters more than the tier name. On Postscript, cost tracks the messages you send, and carrier fees apply on top of the platform rate, so a list that sends more often costs more even if the plan stays the same. On Mailchimp, cost tracks the contacts you store, so a list that grows across a tier boundary can raise the bill even if you send the same number of messages. Mailchimp's page also warns that overage charges apply when limits are exceeded, so check the limits against your real send volume.

A worked example: a store with 12,000 contacts

Illustrative scenario, not a customer: a store has 12,000 contacts, an assumed 40% of them opted in to SMS, and 3 text campaigns a month. That gives 4,800 SMS-eligible shoppers (12,000 × 40%) and 14,400 messages a month (4,800 × 3). On Postscript, the 14,400 is the number to price, because the per-message rates and carrier fees apply to each send, so run the current rates from its pricing page against that count. On Mailchimp, the same 14,400 messages have to fit the SMS credit blocks you buy, and unused credits expire, so a block that is too small or too large each costs you. If your developer builds a custom sync, the Postscript subscriber create call takes a phone_number, and the Mailchimp member record is keyed on an email_address. An assumed 3 hours of developer time to map and test those fields is a planning placeholder, not a quote.

Vendor profiles: where each one fits and where it strains

Mailchimp: best fit, limits and setup

Vendor facts: The Free plan has no SMS. MMS is listed only for Standard and Premium plans. Installation runs from the Shopify App Store, and the listing warns that external charges may be billed separately from the Shopify invoice. For custom sync, the Marketing API's member endpoint takes an email_address and a status field, and the docs list five allowed status values: subscribed, unsubscribed, cleaned, pending and transactional, according to Mailchimp Developers (current docs).

Mailchimp Shopify rating: 4.8 from 1,578 reviews according to Shopify App Store (current listing).

Our read: Mailchimp fits an email-led brand that wants one platform for campaigns and automations, with a modest SMS add-on, and that is comfortable with an Intuit-owned vendor. Its contact-based pricing means list cleaning has a direct cost effect, so a regular suppression routine pays off here. Plan a sync test before launch: confirm that opted-in SMS contacts from Shopify appear in the list before the first campaign goes out.

Postscript: best fit, limits and setup

Vendor facts: Postscript's listing describes it as a Shopify app for SMS campaigns, with listed workflows for cart recovery, welcome messages, win-back campaigns and one-time passwords. Its pricing page lists a usage model with per-message rates and carrier fees, a 2-keyword entry tier, unlimited keywords on the next tier, and API access on the Professional tier. Its API how-to asks you to first look up a keyword with a GET call to /api/v2/keywords/[keyword_id], then send a POST to /api/v2/subscribers with a bearer key. It also asks you to show compliant opt-in language wherever you collect subscriber information, according to Postscript Developers (current docs).

Postscript Shopify rating: 4.7 from 1,206 reviews according to Shopify App Store (current listing).

Our read: Postscript fits a Shopify store where text flows drive a meaningful share of repeat orders, and where the team wants SMS reporting and keyword-based opt-in in one tool. Its limit is structural: it is built around Shopify, so a store on another platform should not expect a native install. Because cost tracks message volume, a high send frequency raises the bill even when the plan itself does not change. Keep the keyword plan in mind as well, since the entry tier's 2 keywords may not cover every opt-in source you run.

Consent, carrier rules and the DIY alternative

For US text marketing, the Telephone Consumer Protection Act sets the legal floor for every tool. TCPA damages: $500 per violation, up to triple if willful according to Cornell Law School LII (current statute text). The award is set per violation, so message volume drives exposure, and the enhanced award applies when a court finds a willful or knowing violation.

Carrier rules sit on top of the statute. A May 2026 commentary from Holland & Knight says carriers made compliance with CTIA's updated principles mandatory for A2P messaging, and that noncompliant messages may be filtered or blocked, according to Holland & Knight (May 27, 2026). The same commentary says CTIA guidelines expect documented consent for virtually all commercial messaging programs, which is broader than the statute.

Neither vendor removes the consent duty. Keep a dated record of where each shopper opted in, the wording they saw and the keyword they used. You still own the consent wording, so have counsel approve it before the first send.

The DIY alternative is stitching the workflow together in Zapier, Make or n8n, or building it in-house. Zapier default pause: 95% of runs failing over 7 days according to Zapier (current help article). The same page says autoreplay retries failed steps, and that account-wide autoreplay needs a Professional plan or higher. Those tools can support run histories, retries and error branches when configured. The buyer still designs and owns the parts that cause damage when they fail: idempotency, so a retried run does not text the same shopper twice; escalation to a named person; access controls on consent data; and maintenance when Shopify or the SMS API changes. A DIY build is a fair choice only when a team already owns those duties.

A proposed design from US Tech Automations would sit between Shopify orders and whichever sending tool you pick. The trigger is a new order or checkout with an SMS consent checkbox. The action writes the contact, the consent source, the timestamp and the keyword to the sending platform through its API. The output is a daily exception list of contacts that failed validation, such as a missing phone number. Prerequisites are Shopify admin access for order events, an API key with rights to create subscribers, and consent wording approved by counsel. The review point is a person who approves the consent wording before the first send and clears the exception list each business day, so no contact enters a campaign on an unreviewed record.

A second proposed US Tech Automations workflow handles opt-outs, which is where many text programs fail. The trigger is an inbound STOP keyword or an unsubscribe event from the sending platform. The action suppresses that number across the shop's marketing segments and the sending list, then writes the change to an audit log. The output is a weekly reconciliation file that shows who opted out and when. Prerequisites are event export or webhook access, confirmed in the platform's API documentation before any build, and a retention rule for the log. The review point is a person who checks any failed suppression before the next campaign runs, because one missed STOP is the costliest error in the program. Both workflows are configurable designs, not a description of a live deployment.

Who should choose which

Who this is for

This is for owners and operations leads of Shopify stores that already have a consent process, or will build one before launch, and who want a clear answer on channel mix before choosing. It is not for stores that have not yet decided what they are willing to send.

Red flags: you have no consent language or opt-out process yet; you run a non-Shopify store and expect a native install; you need one flat monthly price with no usage component.

Common mistakes to avoid

• Comparing headline plan tiers and ignoring per-message or per-contact costs.

• Assuming SMS comes with Mailchimp's Free plan. It does not.

• Launching SMS without a dated record of where each shopper opted in.

• Skipping a sync test between Shopify segments and the sending list.

• Building a Zap with no named owner, no failure alert and no duplicate check.

Common questions

When NOT to use US Tech Automations: A simpler existing tool wins if your store sends only a few emails a month and a free plan covers the list, because a custom workflow adds cost and review time without a bigger payoff. It also wins if your current Postscript or Mailchimp setup already has clean consent records and working flows, since a second layer adds one more system to review. And if nobody on your team can own a workflow after launch, the native Shopify install of either vendor is the more honest choice.

Is Mailchimp still independent of Intuit?

No. Intuit closed its acquisition of Mailchimp in 2021, and the Shopify listing now names Intuit Mailchimp as the developer.

Does Postscript include email?

Partly. Its Shopify listing includes an email marketing section with campaign types such as abandoned cart and welcome emails, and its pricing page lists email as a separate channel with a waitlist. Confirm current email scope on the pricing page before you drop an email tool.

Is SMS included on Mailchimp's free plan?

No. The Free plan lists SMS as not included, and SMS is an add-on to paid plans in select countries.

Do I need a developer to connect either tool to Shopify?

Usually not for a standard install, since both are listed as Shopify apps. A developer is needed only for custom sync through the vendors' APIs.

Can I run both tools?

Yes, but a second tool doubles your consent records and creates duplicate-send risk unless suppression lists are shared between them.

Bottom line

Pick Postscript if text flows are where your repeat revenue comes from and your store runs on Shopify. Pick Mailchimp if email leads and SMS is an add-on you test first. Before you sign either contract, read current pricing on both vendor pages, model your contact and message counts, and document your consent process. If you want a proposed setup to compare against, see how US Tech Automations configures this.