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Postscript vs Salesforce Flows

Postscript logo

Postscript

Marketing

SMS marketing built for Shopify merchants, with carrier fees billed on top of message rates

From
$49/month
Rated
-
Full reviewWebsite
Salesforce Flows logo

Salesforce Flows

Automation Integration

Automation inside Salesforce

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Salesforce Flows has a free tier, so it costs nothing to try first.
  • Each has a real cost: Postscript carrier pass-through fees are billed on top of the per-message rate, roughly $0.00418 per SMS and $0.00841 per MMS in the United States, and are routinely missing from the cost comparisons buyers build.; Salesforce Flows not suitable for highly complex scenarios with intricate decision-making or bulk data processing
  • They diverge on capability: Postscript covers Shopify segmentation, Salesforce Flows covers Visual flow builder.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Postscript and Salesforce Flows actually diverge.

Attributes where Postscript and Salesforce Flows differ
AttributePostscriptSalesforce Flows
Starting price$49/monthFree
Pricing modelPer month plus per message sentUnknown
Free tierNoYes
PlatformsWeb, iOSSalesforce Cloud, Web, Mobile
CategoryMarketingAutomation Integration
FoundedUnknown1999

Identical on both: user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Postscript

  • Shopify segmentation
  • Automated flows
  • Subscriber acquisition
  • Two-way conversations
  • MMS campaigns
  • Revenue attribution
  • Headless SDK
  • Usage-based tiers

Only in Salesforce Flows

  • Visual flow builder
  • Approvals
  • Scheduled actions
  • Screen flows
  • Multi-step workflows
  • Conditional logic
  • Error handling
  • Salesforce native

What people use each for

The jobs each tool is most often brought in to do.

Postscript

  • A Shopify direct-to-consumer brand that wants abandoned cart recovery by text rather than another email in an ignored inboxnot Salesforce Flows
  • A brand running a product drop where a timed broadcast to an opted-in list is the whole launch mechanismnot Salesforce Flows
  • A merchant segmenting by past purchase and variant to send replenishment reminders at the right intervalnot Salesforce Flows
  • A store on headless Shopify or a custom stack that still wants SMS built on order data through the SDKnot Salesforce Flows

Salesforce Flows

  • Workflow Automationnot Postscript
  • Data Integrationnot Postscript
  • Process Automationnot Postscript
  • App Integrationnot Postscript
  • API Connectivitynot Postscript

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Postscript

  • Carrier pass-through fees are billed on top of the per-message rate, roughly $0.00418 per SMS and $0.00841 per MMS in the United States, and are routinely missing from the cost comparisons buyers build.
  • The cheapest per-message rates require the $500 a month plan, so a small sender pays more than double the headline low rate per text.
  • The $0 Starter plan carries a $49 minimum monthly spend, so it is not a free tier and quiet months still generate a bill.
  • US SMS marketing carries real legal exposure under consent, quiet hours and carrier registration rules, and the compliance obligation sits with the merchant, not the platform.
  • It is SMS and MMS only, so email, push and on-site messaging live in a separate tool and audience suppression between the two has to be managed across systems.

Salesforce Flows

  • Not suitable for highly complex scenarios with intricate decision-making or bulk data processing
  • No automatic record locking, causing conflicts when multiple users update same records
  • Limited error handling compared to Apex
  • Requires Enterprise edition or higher for full capabilities
  • Auto-launched Flows cannot display screens to users
  • Complex dependency management and configuration challenges when deploying between environments

Pricing, plan by plan

Postscript

$49/month
  • Starter$49/month
    • $0 base fee but a $49 minimum monthly spend
    • SMS at $0.015 and MMS at $0.045 per message
    • Campaigns, automations, acquisition tools and analytics
  • Growth$100/month
    • Lower per-message rates than Starter
    • Full campaign and automation feature set
    • No contract required
  • Professional$500/month
    • Rates falling towards $0.007 SMS and $0.024 MMS
    • Suited to high-volume senders
    • Upgrade or downgrade at any time
  • Enterprise$undefined/month
    • Custom pricing on a contract
    • Negotiated message rates and support terms

Salesforce Flows

Free
  • Salesforce FreeFree
    • 2 user licenses
    • Basic workflows
    • Limited automation
  • Starter$25/user/month
    • Sales flows
    • Lead routing
    • Email marketing analytics
  • Professional$100/user/month
    • Sales quoting
    • Forecasting
    • AppExchange access
  • Enterprise$165/user/month
    • Full Flow Builder
    • Custom objects
    • Sandboxes

Which should you pick?

Choose Postscript if

  • You need shopify segmentation.
  • You work on Web, iOS.
  • You also want automated flows.
Postscript review

Choose Salesforce Flows if

  • You need visual flow builder.
  • You want to start without paying.
  • You work on Salesforce Cloud, Web, Mobile.
  • You also want approvals.
Salesforce Flows review

Questions people ask

Is Postscript or Salesforce Flows better?
Neither clearly leads. Postscript starts at $49/month and Salesforce Flows at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Postscript or Salesforce Flows?
Salesforce Flows has a free tier; the other does not. Paid plans start at $49/month for Postscript and Free for Salesforce Flows.
Does Postscript or Salesforce Flows run on more platforms?
Postscript runs on Web, iOS. Salesforce Flows runs on Salesforce Cloud, Web, Mobile.
Can I use Salesforce Flows for free?
Yes. Salesforce Flows has a free tier, so you can try it without paying. Postscript starts at $49/month.
What is Postscript best used for?
Postscript is most often used for a shopify direct-to-consumer brand that wants abandoned cart recovery by text rather than another email in an ignored inbox, a brand running a product drop where a timed broadcast to an opted-in list is the whole launch mechanism, a merchant segmenting by past purchase and variant to send replenishment reminders at the right interval, a store on headless shopify or a custom stack that still wants sms built on order data through the sdk. Of those, a shopify direct-to-consumer brand that wants abandoned cart recovery by text rather than another email in an ignored inbox and a brand running a product drop where a timed broadcast to an opted-in list is the whole launch mechanism are not what Salesforce Flows is typically brought in for.
What can Postscript do that Salesforce Flows cannot?
Postscript covers Shopify segmentation, Automated flows, Subscriber acquisition, Two-way conversations. Salesforce Flows covers Visual flow builder, Approvals, Scheduled actions, Screen flows.

Answered from the vendors’ own pages

Postscript: Is Postscript only for Shopify?

It is built for Shopify and that is where its segmentation advantage lies, but headless and non-Shopify stores are supported through an SDK with more setup work.

Salesforce Flows: Which Salesforce editions include Flows?

Salesforce Flow Builder is included in Enterprise Edition ($165/user/month) and above. Professional Edition lacks advanced automation capabilities and Flow Builder access. Starter and lower editions have limited Flow support.

Source
Postscript: What is the real cost per text?

The plan rate plus carrier fees. On Starter that is about $0.015 plus roughly $0.00418 in US carrier fees per SMS, so budget close to two cents a message before discounts.

Salesforce Flows: What are the main limitations of Salesforce Flows?

Flows are limited by DML operations (max 150 data elements that modify data), SOQL queries (max 100 data elements that retrieve data), and are not designed for bulk processing. Auto-launched Flows do not support screens and have limited error handling compared to Apex.

Source
Postscript: Is the Starter plan free?

No. The base fee is $0 but there is a $49 minimum monthly spend, so it functions as a $49 floor.

Salesforce Flows: Can Salesforce Flows integrate with external systems?

Yes, through MuleSoft connectors and Salesforce API Catalog. Pre-built connectors exist for systems like Asana, and admins can create custom connectors. Complex integrations may still require Apex or third-party platforms.

Source
Postscript: Do I need a contract?

No. Contracts are offered but not required, and plans can be moved up or down at any time under usage-based billing.

Salesforce Flows: When was Salesforce Flow redesigned?

Flow Builder was introduced in Spring '19 as a replacement for the previous Flow Designer, providing a more familiar interface similar to other Salesforce Lightning Builder tools.

Source
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