Postscript

Postscript is an ecommerce messaging platform for brands that want to run SMS programs alongside broader retention marketing. It is best suited to teams that need acquisition, automated journeys, segmentation, and analytics in one system. Its strongest case is the breadth of that toolkit; its main trade-off is that plan minimums, message rates, and carrier fees all affect the bill.

Overview

Postscript describes its product as an agentic retention marketing platform spanning SMS, RCS, email, and future channels. The marketing plans bring campaign and automation workflows together with subscriber acquisition, segmentation, analytics, response management, and custom attribution windows. That makes it a more complete option for ecommerce teams than a service focused only on sending texts.

The Agentic Context Platform stores brand and customer context for AI agents and is included with every plan at no extra cost. Its integration directory covers ecommerce platforms, email, customer support, loyalty, reviews, analytics, and workflow automation. Developers can use the API, JavaScript SDK, and webhooks, though API access for custom integrations is included in Professional and Enterprise plans.

Key features

Campaigns and automations

Every marketing plan includes a visual flow builder with automation templates, along with subscriber acquisition tools, unlimited segments, analytics, response management, and custom attribution windows. The shared core is useful for brands that need to coordinate campaigns and automated messaging without giving up segmentation or measurement on a lower tier. The main differences between these plans are message rates, support, and higher-tier capabilities rather than access to the basic workflow toolkit.

AI and channel options

The separate Postscript AI Plan adds Brand Center controls for message tone and brand knowledge, Infinity Testing for message variants, and Shopper for personalized journeys. It costs $699/mo. and uses per-message rates from $0.003 to $0.30 depending on product and message type. Those tools are relevant to teams that specifically want these AI products; the Agentic Context Platform itself is already included with every plan.

Enterprise can add RCS as an option. Postscript also supports MMS, inbound messaging, audience segmentation, workflow automation, and compliance tools. Its features and list-growth tools are built to follow TCPA, mobile carrier, and other regulatory guidelines.

Privacy and support

Shops can submit subscriber access and deletion requests; API-based requests are available on Professional and Enterprise. Customer Experience Advocates provide live chat Monday–Friday, 6am PT to 5pm PT, and email support. Professional and Enterprise include dedicated onboarding and priority support, making those tiers more suitable for teams that want a higher-touch rollout.

Pricing

Postscript has a free plan, but its Starter tier carries a $49 monthly minimum spend. Messaging rates apply to the United States 50 states and Canada, with carrier fees added. A dedicated short code is listed at $750/month through carriers, so brands should consider message volume and number type in addition to the plan price.

Starter is the entry point for brands that can work within two opt-in keywords and do not need paid-tier support or API access; its $49 minimum means it is not a zero-cost operating option. Growth raises the monthly fee to $100/mo. for unlimited opt-in keywords and live chat and email support, while slightly lowering SMS and MMS rates. Professional costs $500/mo. and is the relevant step for enhanced analytics, priority support, and custom integrations through the API. Enterprise is for teams needing a dedicated success manager, warehouse data push, or optional RCS, with custom pricing.

The $699/mo. AI Plan has a different focus: it bundles three named AI products and charges per message across a wide stated range. Compare that pricing with the marketing plans based on the features needed, not just the monthly figure. The free trial provides $100 in credit for the first 30 days; after the credit runs out or the 30 days end, additional messages are charged at the Free package rate unless another package is selected.

Platforms

Postscript is available on web and through its API. The API, JavaScript SDK, and webhooks give developers integration options, but custom API access is included with Professional and Enterprise plans. Subscriber deletion and access requests can also be submitted through an API on those two plans.

Who it's for

Postscript is a strong fit for ecommerce brands building SMS-led retention programs that need acquisition, automations, audience segmentation, analytics, and response management together. Growth fits teams that need more opt-in keywords and support; Professional suits those that need enhanced analytics or custom integrations. Brands that only need occasional texting, cannot support the $49 Starter minimum, or do not need the broader marketing toolkit should consider a narrower or lower-commitment option.

Pros and cons

• Pros: All marketing plans include a substantial workflow baseline: automation templates, acquisition tools, unlimited segments, analytics, response management, and custom attribution windows.
• Pros: Starter's toll-free number and two opt-in keywords give smaller programs a defined entry tier, while Growth and Professional reduce the listed SMS and MMS rates as they add capabilities.
• Pros: The Agentic Context Platform is included with every plan, while the AI Plan provides additional named tools for message controls, testing, and personalized journeys.
• Cons: Starter is priced at $0/mo. but still has a $49 monthly minimum spend, and carrier fees are additional.
• Cons: API access for custom integrations and API-based subscriber requests require Professional or Enterprise, a substantial step up from Starter or Growth.
• Cons: The trial credit is limited to $100 and 30 days; after it is exhausted or expires, messages are charged at the Free package rate unless another package is selected.

Alternatives

Textmagic is worth considering for teams that want a service available on Android, iOS, web, and API; its Essential plan is 100% prepaid, with rates varying by destination country and a 160-character plain-text SMS part limit.

Attentive may suit teams looking for AI tools for generating messages and subject lines plus automated retargeting, with AI Essentials included with all plans.

Remelo is a freemium alternative for appointment-focused users, with its Newbie plan covering 25 appointments, SMS and email reminders, confirmations, one staff member, one online booking page, calendar integration, and online rescheduling.

Bird Verify is a different option for verification: its Verify plan has no separate verification fee, while channel message charges apply.

Textedly is another option for teams comparing message-volume plans; its Basic plan provides 500 messages/month billed monthly or 600 messages/month with annual billing, which includes 20% more messages per month.

Kenect is an alternative paid messaging product.

Text Request may fit organizations comparing higher-volume plans; its Enterprise plan is $575 a month billed monthly and includes 20,000 texts, 10 dashboards, and $0.032 per additional text.

Pulse SMS is another paid option available on Android, iOS, and web.

For broader category comparisons, see Business Text Messaging Software, Messenger Marketing Software, and SMS Marketing Software.

Verdict

Choose Postscript if you run an ecommerce brand that wants SMS-led retention with acquisition tools, automation, segmentation, and analytics in one platform, and can budget for message and carrier charges beyond the plan fee. Its AI context layer across plans and richer Professional and Enterprise options strengthen the case for teams building more involved programs. Look elsewhere if the Starter minimum or the cost of reaching API access and higher-tier support does not fit your needs.