# Postscript vs Attentive: which one is the right SMS platform once a Shopify brand needs two-way conversational texting?

Reviewed by Martin Dejnicki, Director of SEO & AI Search · facts verified October 10, 2026 · canonical: https://deploi.ca/shopify/faq/postscript-vs-attentive-two-way-conversational-sms

## Short answer

Postscript fits Shopify brands that answer two-way texts themselves; Attentive fits brands buying live agents, not staffing the inbox. Postscript publishes $0.007 to $0.009 per SMS (text message) plus carrier fees ([Postscript's pricing page](https://postscript.io/pricing), October 2026), so Postscript can be priced without a sales call. Attentive publishes no SMS plan or per-message prices ([Attentive pricing](https://www.attentive.com/pricing), October 2026).

- **Postscript SMS rate:** $0.007 to $0.009 per SMS. Plus carrier fees at cost, averaging $0.00330 per US SMS; Starter is $0 a month with a $49 monthly minimum, Growth $100, Professional $500, Enterprise quoted (October 2026) ([Postscript, Pricing](https://postscript.io/pricing))
- **Postscript conversational AI:** $699 a month Postscript AI Plan. Shopper comes in the Postscript AI Plan with Brand Center and Infinity Testing, plus per-message rates of $0.003 to $0.30 by product and message type (October 2026) ([Postscript, Pricing](https://postscript.io/pricing))
- **Short code:** $750 a month at both vendors. Postscript passes the carriers' fee on without markup, and its help pages give about 4 to 7 or about 14 weeks to approve; Attentive bills a non-vanity code at $750 and quotes 4 to 6 weeks (October 2026) ([Postscript Help Center, Comparing Short Code and Toll-Free Numbers](https://help.postscript.io/en/articles/13563949-comparing-short-code-and-toll-free-numbers); [Attentive Help Center, FAQs: Shortcodes](https://help.attentive.com/hc/en-us/articles/360041541572-FAQs-Shortcodes); [Postscript Help Center, Timeline for a Dedicated Short Code](https://help.postscript.io/en/articles/13563947-timeline-for-a-dedicated-short-code))
- **Toll-free verification:** 3 to 10 business days, free at Postscript. Postscript verifies the toll-free number it assigns at install; until then the number can't text subscribers in the United States or Canada (October 2026) ([Postscript Help Center, Comparing Short Code and Toll-Free Numbers](https://help.postscript.io/en/articles/13563949-comparing-short-code-and-toll-free-numbers); [Postscript Help Center, Guide to the Toll-Free Number (TFN) Verification Process](https://help.postscript.io/en/articles/13563946-guide-to-the-toll-free-number-tfn-verification-process))

## Deploi's call

Postscript is the right SMS (text message) platform for a Shopify brand that will run two-way texting itself, and Attentive is right for a brand buying a staffed program. We scored Postscript versus Attentive BUY with a scale split, and the split is not revenue, it is staffing. The deciding question is who writes the replies. The honest way to ask it: "name the person who answers a customer text at 9pm on a Sunday" (Deploi verdict, September 2026).

**BUY: Choose Postscript when**

- Your own team will answer what Shopper, Postscript's conversational AI, escalates by email, phone, form or helpdesk ticket ([Postscript](https://postscript.io/shopper), October 2026).
- Finance needs a modeled cost before a sales call: $0.007 to $0.009 per SMS (text message) plus carrier fees ([Postscript pricing](https://postscript.io/pricing), October 2026).
- Your list sits below roughly 100,000 engaged subscribers, where Deploi's Postscript vs. Attentive record scores Postscript BUY for self-serve programs ([Deploi Build vs. Buy](https://deploi.ca/shopify/build-vs-buy/postscript-vs-attentive), October 2026).

**BUY: Choose Attentive when**

- Nobody on your team will staff the inbox, and you want conversational AI with AI-assisted live agents answering 24/7 ([Attentive Concierge](https://www.attentive.com/concierge), October 2026).
- SMS has a dedicated owner and the list passes roughly 100,000 engaged subscribers, where the same record expects negotiated per-message rates to repay the quote process ([Deploi Build vs. Buy](https://deploi.ca/shopify/build-vs-buy/postscript-vs-attentive), October 2026).
- Your volume justifies negotiating, because Attentive tailors its pricing and publishes no SMS plan or message rates ([Attentive pricing](https://www.attentive.com/pricing), October 2026).

## Who writes the replies when Postscript or Attentive runs two-way texting?

Your own team writes the escalated replies on Postscript, while Attentive sells live agents to write them. Two-way SMS (text message) is an inbox with a service level, so this vendor choice is mostly a staffing choice. Every Postscript plan includes "Response management (reply to texts from subscribers)" ([Postscript's pricing](https://postscript.io/pricing), October 2026), and both vendors now put AI in front of the inbox:

**Postscript's AI hands escalations to your team, while Attentive's AI works beside its own live agents**

| Question | Postscript | Attentive |
| --- | --- | --- |
| Conversational AI | Shopper, whose AI agents "decide when to send, what to say, which offer to include, and how to personalize" | Concierge, where "Conversational AI and AI-assisted live agents work together" around the clock |
| Who takes escalations | Your team, by support email, phone, form or a Gorgias or Zendesk ticket, after Shopper's 24/7 first reply | Attentive's AI-assisted live agents |
| Managed service | Postscript Plus: a dedicated messaging strategist in each of three tiers | Strategic planning, onboarding and a dedicated support team on every plan |

Sources: [Postscript, Shopper: Agentic 1:1 Marketing is here](https://postscript.io/shopper); [Attentive, Attentive Concierge: Conversational Commerce Solution](https://www.attentive.com/concierge); [Attentive, Attentive Pricing](https://www.attentive.com/pricing); [Postscript, Postscript Plus](https://postscript.io/postscript-plus). Verified October 9, 2026.

Headline claims don't separate them: Postscript cites a 15x median incremental return on ad spend (iROAS) and Attentive more than 15 times return on investment (ROI), neither with a sample or a date ([Postscript](https://postscript.io/shopper) and [Attentive](https://www.attentive.com/concierge), October 2026). If nobody on your side will answer a thread that goes sideways on a Saturday, buy the staffing. [How fast Postscript's and Klaviyo's support teams answer when a send breaks](https://deploi.ca/shopify/faq/postscript-vs-klaviyo-support-response-time) is a separate question.

## Should a two-way SMS program send from a short code or a toll-free number?

A short code (a 5 or 6-digit number) suits high-volume sending and a toll-free number (10 digits) suits a fast launch, because the number type sets approval time, throughput and cost before the vendor does. Postscript documents both for SMS (text message) and MMS (picture message):

**A short code sends faster but takes weeks and costs $750 a month; a toll-free number is free at Postscript and approved in days**

| Factor | Short code | Toll-free number |
| --- | --- | --- |
| Approval | About 4 to 7 weeks or about 14, on two Postscript help pages; 4 to 6 weeks for a non-vanity code at Attentive | About 3 to 10 business days at Postscript |
| Throughput | "7x faster for SMS messages and 10x faster for MMS messages on average" | "Economical deliverability and throughput" |
| Monthly cost | $750 at Postscript, passed on "without any additional markup"; $750 at Attentive | Free at Postscript, verification included |
| Coverage at Postscript | US only, so a Canadian list needs a toll-free number | US and Canada |

Sources: [Postscript Help Center, Comparing Short Code and Toll-Free Numbers](https://help.postscript.io/en/articles/13563949-comparing-short-code-and-toll-free-numbers); [Attentive Help Center, FAQs: Shortcodes](https://help.attentive.com/hc/en-us/articles/360041541572-FAQs-Shortcodes); [Postscript Help Center, Timeline for a Dedicated Short Code](https://help.postscript.io/en/articles/13563947-timeline-for-a-dedicated-short-code). Verified October 9, 2026.

A mid-October short code application lands after Black Friday (27 November 2026) at about 14 weeks and could at 4 to 7, while a toll-free number can be verified in time ([Postscript Help Center](https://help.postscript.io/en/articles/13563949-comparing-short-code-and-toll-free-numbers) and [its short code timeline](https://help.postscript.io/en/articles/13563947-timeline-for-a-dedicated-short-code), October 2026). Throughput is what breaks in production: Postscript warns that a large send in a short period can overflow the message queue ([Postscript's throughput guide](https://help.postscript.io/en/articles/13563879-guide-to-message-deliverability-and-throughput), October 2026). [Postscript's full onboarding timeline](https://deploi.ca/shopify/faq/postscript-onboarding-timeline-first-campaign) sets out every approval queue.

## What do US opt-out rules require of a two-way inbox?

US opt-out rules require a staffed two-way inbox, because customers revoke consent in their own words and every revocation runs on a deadline. The Code of Federal Regulations (CFR) sets that deadline. A reply of "stop," "quit," "end," "revoke," "opt out," "cancel," or "unsubscribe" revokes consent outright. Any other reply counts if "a reasonable person would understand those words to have conveyed a request to revoke consent." Every revocation must be honored within "a reasonable time not to exceed ten business days from receipt of such request", and senders "may not designate an exclusive means to request revocation of consent" ([47 CFR 64.1200](https://www.ecfr.gov/current/title-47/chapter-I/subchapter-B/part-64/subpart-L/section-64.1200), October 2026). So opt-outs arrive as free text, which is why Postscript lists "fuzzy opt-outs" and automatic removal of subscribers who change carriers among its compliance tools ([Postscript's compliance guide](https://postscript.io/the-ultimate-sms-compliance-guide), October 2026).

*This describes an operational workload, not legal advice. Have counsel review your opt-in language and record-keeping before you scale a two-way program.*

## What do Postscript and Attentive publish about price?

Postscript publishes its SMS (text message) rates, and Attentive publishes no SMS plan or per-message prices. So only Postscript's SMS cost can be modeled before a sales call. Postscript charges $0.007 to $0.009 per SMS plus carrier fees, which average $0.00330 per US SMS ([Postscript pricing](https://postscript.io/pricing), October 2026). Those listed rates cover the 50 US states and Canada. Starter is $0 a month with a $49 monthly minimum spend, Growth $100, Professional $500 and Enterprise quoted. Shopper, Postscript's conversational AI, sits in the Postscript AI Plan at $699 a month plus per-message rates of $0.003 to $0.30.

Attentive's App Store listing offers a "Minimum 30-day free trial" and says "Additional charges may apply" ([Shopify App Store](https://apps.shopify.com/attentive), October 2026). Its pricing page says pricing "is tailored to your business needs" ([Attentive pricing](https://www.attentive.com/pricing), October 2026). The one SMS fee Attentive prints is the short code: $750 a month for a non-vanity code and $1,250 for a vanity one ([Attentive Help Center](https://help.attentive.com/hc/en-us/articles/360041541572-FAQs-Shortcodes), October 2026).

That difference is about your calendar, not value. If your approval process needs a figure in a deck before anyone takes a meeting, the price asymmetry decides more than the feature comparison does.

## Where is Postscript or Attentive the right SMS platform?

Postscript is the right SMS (text message) platform when your own team will run the inbox, and Attentive is right when you want to buy the staffing.

- **Postscript** fits when Shopify is the storefront, your support team will own escalations and you want to model cost before you commit. [Why a Shopify-only stack favors Postscript](https://deploi.ca/shopify/faq/postscript-over-attentive-shopify-only-stack) tests that case.
- **Postscript with Postscript Plus** fits when you want self-serve rates but nobody to run the program. You are buying strategists; ask what Plus's listed "Conversational Support for brands using Shopper" covers before you count on it for replies.
- **Attentive** fits when SMS is the primary owned channel, volume justifies a negotiated rate and you want live agents covering the inbox around the clock.
- **Neither vendor** fits yet when nobody has sized the channel.

Certification doesn't settle it: Shopify lists both vendors under "Messaging and notifications" among its Certified Technology Partners ([Shopify](https://www.shopify.com/partners/blog/shopify-plus-apps), October 2026), so [the badge works as a vetting floor](https://deploi.ca/shopify/faq/postscript-shopify-plus-certified-partner). If a second ecommerce platform is coming, weigh [Postscript's Shopify focus against Klaviyo's platform breadth](https://deploi.ca/shopify/faq/postscript-shopify-only-focus-vs-klaviyo).

## When should a brand hold off on the Postscript and Attentive decision?

Hold off on the Postscript and Attentive decision when the number type, the inbox owner or the consent records are unsettled, because each one decides more than the vendor does.

> **When not to do this**
> - **When you have not chosen the number type.** Postscript's help pages put a short code at about 4 to 7 weeks or about 14 ([Postscript Help Center](https://help.postscript.io/en/articles/13563947-timeline-for-a-dedicated-short-code), October 2026), so choosing the vendor first leaves the slower decision for last.
> - **When nobody owns the inbox.** Two-way texting with no staffed reply path invites replies it will not answer.
> - **When your consent records are not exportable.** A list whose opt-in source and date you cannot evidence moves a compliance problem, and [what moves when a list changes platforms](https://deploi.ca/shopify/faq/email-plugin-mapping-klaviyo-attentive-postscript) shows what survives.
> - **When the trigger is Klaviyo's SMS (text message) renewal.** That is a stack decision, and [the Klaviyo, Omnisend and Attentive comparison](https://deploi.ca/shopify/faq/klaviyo-vs-omnisend-vs-attentive-20m-100m-gmv) answers it.
> - **In the same quarter as peak.** A new sending number is a new sender reputation, so build it in a quiet month.

## Deploi's point of view

**What we've seen.** In scoping conversations the SMS vendor question arrives already decided and the number question has not been asked at all. Toll-free versus short code sets the launch date, the per-send throughput and a $750 per month line item, and it routinely gets discovered in week three of an implementation that was sold as two weeks.

**Where we disagree.** The category compares these two on features and list-growth tooling. Both are adequate there, and neither difference survives contact with a real program. What does not converge is the operating model: one vendor sells you software and an optional strategist, the other sells you staffed conversations. Compare the operating models and the feature grid stops mattering.

**What this page adds to our own decision records.** Our Postscript vs. Attentive record gives a compliant first campaign inside one to two weeks as its illustrative estimate. Postscript's documentation makes that possible at best on the toll-free path, where verification alone runs 3 to 10 business days, and impossible on the short code path, where approval runs about 4 to 7 weeks or about 14 on Postscript's two help pages. The record's timeline should carry the number type as a condition.

## When this answer changes

- Postscript changes its per-message SMS rates, its $49 Starter minimum or its $699 Postscript AI Plan.
- Attentive publishes SMS plan or per-message prices, or changes its $750 monthly short code fee.
- Postscript Plus or Attentive Concierge changes who answers escalated customer conversations.
- Carriers change short code approval times or the $750 monthly short code fee.
- The Federal Communications Commission changes the opt-out rules in 47 CFR 64.1200, such as the ten-business-day deadline.
- Deploi re-scores its Postscript vs. Attentive record or moves its line of roughly 100,000 engaged subscribers.

## Follow-up questions

- [Why would a mid-market Shopify brand pick Postscript's Shopify-only focus over Klaviyo's broader platform support?](https://deploi.ca/shopify/faq/postscript-shopify-only-focus-vs-klaviyo)
- [Why would a Shopify brand pick Postscript over Attentive specifically for a Shopify-only (no other platform) tech stack?](https://deploi.ca/shopify/faq/postscript-over-attentive-shopify-only-stack)
- [What's the real support-response time for Postscript compared to Klaviyo when an SMS campaign breaks mid-send?](https://deploi.ca/shopify/faq/postscript-vs-klaviyo-support-response-time)
- [What's the actual onboarding timeline for Postscript on a Shopify Plus store, from install to first live campaign?](https://deploi.ca/shopify/faq/postscript-onboarding-timeline-first-campaign)
- [Is Postscript a certified Shopify Plus technology partner, and does that matter when vetting an SMS vendor?](https://deploi.ca/shopify/faq/postscript-shopify-plus-certified-partner)

## Sources

1. [Attentive, Attentive: AI-led Email & SMS on the Shopify App Store](https://apps.shopify.com/attentive), checked October 9, 2026
2. [Postscript, Pricing](https://postscript.io/pricing), checked October 9, 2026
3. [Postscript, Shopper: Agentic 1:1 Marketing is here](https://postscript.io/shopper), checked October 9, 2026
4. [Attentive, Attentive Concierge: Conversational Commerce Solution](https://www.attentive.com/concierge), checked October 9, 2026
5. [Attentive, Attentive Pricing](https://www.attentive.com/pricing), checked October 9, 2026
6. [Postscript, Postscript Plus](https://postscript.io/postscript-plus), checked October 9, 2026
7. [Postscript Help Center, Comparing Short Code and Toll-Free Numbers](https://help.postscript.io/en/articles/13563949-comparing-short-code-and-toll-free-numbers), checked October 9, 2026
8. [Postscript Help Center, Guide to the Toll-Free Number (TFN) Verification Process](https://help.postscript.io/en/articles/13563946-guide-to-the-toll-free-number-tfn-verification-process), checked October 9, 2026
9. [Attentive Help Center, FAQs: Shortcodes](https://help.attentive.com/hc/en-us/articles/360041541572-FAQs-Shortcodes), checked October 9, 2026
10. [eCFR, 47 CFR 64.1200 Delivery restrictions](https://www.ecfr.gov/current/title-47/chapter-I/subchapter-B/part-64/subpart-L/section-64.1200), checked October 9, 2026
11. [Postscript, The Ultimate SMS Compliance Guide](https://postscript.io/the-ultimate-sms-compliance-guide), checked October 9, 2026
12. [Shopify, Shopify Certified Technology Partner Program](https://www.shopify.com/partners/blog/shopify-plus-apps), checked October 9, 2026
13. [Postscript Help Center, Guide to Message Deliverability and Throughput](https://help.postscript.io/en/articles/13563879-guide-to-message-deliverability-and-throughput), checked October 9, 2026
14. [Postscript Help Center, Timeline for a Dedicated Short Code](https://help.postscript.io/en/articles/13563947-timeline-for-a-dedicated-short-code), checked October 10, 2026
15. [Deploi Build vs. Buy, Postscript vs. Attentive: Which SMS Platform Fits Shopify?](https://deploi.ca/shopify/build-vs-buy/postscript-vs-attentive), checked October 9, 2026, Deploi research