How do I build an SMS subscriber list legally?

You must get explicit written consent before sending marketing SMS. Methods include: website pop-ups with SMS opt-in, checkout opt-in checkboxes (unchecked by default), text-to-join keywords on signage and social media, and email campaigns promoting SMS signup. Never purchase phone number lists or add contacts without consent—this violates TCPA and can result in $500–$1,500 per message in fines. Double opt-in (confirmation text) is best practice.

How often should I send SMS marketing messages?

Most brands send 2–6 SMS messages per month. More than 1 per week leads to higher unsubscribe rates. Reserve SMS for high-value messages—flash sales, exclusive offers, time-sensitive promotions, and important updates. Use email for lower-urgency communications. The high open rate of SMS means each message gets attention—abuse that attention and you lose subscribers quickly.

What is the ROI of SMS marketing?

SMS marketing generates $10–$25 per message sent for well-segmented campaigns, significantly outperforming email. Abandoned cart SMS recovery rates reach 15–25%, compared to 5–10% for email. The key is relevance and restraint—targeted messages to engaged subscribers perform well, while mass blasts generate unsubscribes. Track revenue attribution per SMS campaign to measure actual ROI against messaging costs.

SMS Marketing

Best SMS Marketing Software 2026

SMS campaigns, automation, and customer engagement.

Postscript

SMS marketing for Shopify.

4.7(920)

$25/mo

CampaignsAutomationPopupsKeywordsSegmentationAnalytics

Shopify native

Great UX

Good compliance

Shopify only

Limited platform

Best for: Shopify storesVisit Site

Klaviyo

Email and SMS marketing platform.

4.6(2,200)

$20/mo

SMS campaignsFlowsSegmentationA/B testingE-commerceAnalytics

Great for e-commerce

Email + SMS

Automation

Gets expensive

Complex

Best for: E-commerce brandsVisit Site

SimpleTexting

Easy SMS marketing platform.

4.6(1,400)

$29/mo

Mass textingKeywordsAutorespondersContactsAnalyticsIntegrations

Easy to use

Affordable

Good features

Limited automation

Basic segments

Best for: Small businessesVisit Site

Attentive

Enterprise SMS marketing.

4.5(580)

Custom

SMSMMSJourneysAISegmentationCreative

Enterprise scale

Strong compliance

Good features

Enterprise pricing

Complex

Best for: Enterprise retailVisit Site

By Misha Catalano, Founder & Lead Software AnalystLast reviewed May 2026

Data verified May 2026

What is SMS Marketing Software?

SMS marketing software enables businesses to send promotional text messages, transactional notifications, and conversational messages to customers who have opted in. With open rates exceeding 95% compared to 20–25% for email, SMS is one of the most effective direct marketing channels. These platforms manage subscriber lists, segment audiences, create message campaigns, automate triggered messages, and track performance. Compliance features handle TCPA and carrier requirements including opt-in management, opt-out processing, and message frequency caps. Two-way messaging enables conversational commerce—customers can reply to messages and engage with support. Integration with e-commerce platforms triggers SMS based on purchase behavior—abandoned cart reminders, shipping notifications, and post-purchase review requests. MMS support includes images, GIFs, and video for richer messaging experiences.

Key Features to Look For

Campaign Management

Creates and sends bulk SMS campaigns with scheduling, segmentation, and A/B testing.

Automation Flows

Triggers messages automatically based on customer actions like purchases and cart abandonment.

Two-Way Messaging

Enables conversational SMS where customers can reply and engage in real-time.

Compliance Management

Handles TCPA compliance with opt-in, opt-out, quiet hours, and frequency caps.

Subscriber Segmentation

Groups subscribers by purchase behavior, engagement, location, and custom attributes.

Analytics & Attribution

Tracks message delivery, click rates, revenue attribution, and subscriber growth.

How Much Does SMS Marketing Cost?

SMS marketing is priced per message or per contact. Klaviyo SMS starts at $15/month for 1,250 SMS credits. Postscript at $25/month for e-commerce SMS. Attentive uses custom pricing based on subscriber count. SMSBump (Yotpo) starts at $19/month. Twilio (developer API) at $0.0079/message. SimpleTexting at $29/month for 500 messages. EZTexting at $20/month for 500 credits. Enterprise platforms like Attentive and Braze cost $1,000–$10,000+/month for large subscriber lists. SMS costs $0.01–$0.05 per message at volume.

Frequently Asked Questions

How We Evaluate SMS Marketing

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