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Influencer Marketing · head to head

Grin vs Postscript

Grin logo

Grin

Influencer Marketing

The all-in-one creator management platform

From
Free
Rated
-
Full reviewWebsite
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

The short version

  • Only Grin has a free tier, so it costs nothing to try first.
  • Each has a real cost: Grin billed on monthly credits rather than seats, and credits are consumed at different rates by activity, so identical usage months can cost different amounts; 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.
  • They diverge on capability: Grin covers Creator discovery, Postscript covers Shopify segmentation.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Grin and Postscript actually diverge.

Attributes where Grin and Postscript differ
AttributeGrinPostscript
Starting priceFree$49/month
Pricing modelusage-basedPer month plus per message sent
Free tierYesNo
PlatformsWeb, ApiWeb, iOS
CategoryInfluencer MarketingMarketing
Founded2014Unknown

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 Grin

  • Creator discovery
  • Relationship management
  • Product seeding
  • Affiliate tracking
  • Content management
  • ROI reporting
  • E-commerce integration
  • Payment processing

Only in Postscript

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

What people use each for

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

Grin

  • Influencer discovery and creator managementnot Postscript
  • Campaign outreach and reporting automationnot Postscript

Postscript

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

Where each one falls short

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

Grin

  • Billed on monthly credits rather than seats, and credits are consumed at different rates by activity, so identical usage months can cost different amounts
  • The free plan allows 200 credits a month against 2,000 on the $200 Starter plan
  • The published tiers run from $200 to $1,500 a month, which is a high floor for a small brand
  • Overage is charged at a flat rate above the plan allowance

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.

Pricing, plan by plan

Grin

Free
  • FreeFree
    • 200 monthly credits
    • Month-to-month billing
  • Starter$200/month
    • 2,000 monthly credits
  • Growth$500/month
    • 7,500 monthly credits
    • Up to 100 active creators with GRIN Classic Capacity
  • Scale$1000/month
    • 20,000 monthly credits
    • Up to 250 active creators

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

Which should you pick?

Choose Grin if

  • You need creator discovery.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want relationship management.
Grin review

Choose Postscript if

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

Questions people ask

Is Grin or Postscript better?
Neither clearly leads. Grin starts at Free and Postscript at $49/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Grin or Postscript?
Grin has a free tier; the other does not. Paid plans start at Free for Grin and $49/month for Postscript.
Does Grin or Postscript run on more platforms?
Grin runs on Web, Api. Postscript runs on Web, iOS.
Can I use Grin for free?
Yes. Grin has a free tier, so you can try it without paying. Postscript starts at $49/month.
What is Grin best used for?
Grin is most often used for influencer discovery and creator management, campaign outreach and reporting automation. Of those, influencer discovery and creator management and campaign outreach and reporting automation are not what Postscript is typically brought in for.
What can Grin do that Postscript cannot?
Grin covers Creator discovery, Relationship management, Product seeding, Affiliate tracking. Postscript covers Shopify segmentation, Automated flows, Subscriber acquisition, Two-way conversations.

Answered from the vendors’ own pages

Grin: How much does GRIN cost?

GRIN offers a free tier with 200 monthly credits, and paid tiers from $200 to $1,500/month with 2,000 to 30,000 monthly credits. Users pay for work performed, not per seat.

Source
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.

Grin: What happens to unused credits in GRIN?

Monthly credits reset each month and do not roll over to the next billing period. However, overage credits purchased beyond the monthly allowance do carry over.

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.

Grin: Can I control my spending with GRIN?

Yes. Users can set their own spending cap to prevent surprise bills. No contracts or minimum commitments are required, and billing is month-to-month.

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.

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.

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