SMS Blast Software for Shopify: 5 Tools Compared

Four questions that separate SMS blast software for ecommerce

Most SMS blast software can schedule a message to a segment, personalise it with a first name and attach a link. The differences that change a store's bill and workload sit underneath that, and they are easier to judge as four separate questions.

The first is the billing unit. Standalone tools bill in credits, where one credit usually covers one 160 character SMS segment and a picture message uses three. Klaviyo bills accounts that have moved to per-message pricing a rate per segment per recipient that already includes carrier fees, and Omnisend sells a monthly SMS subscription whose rate depends on what you commit to spend. A message that runs long or carries an image costs more on all of them, but by different amounts (SlickText; SimpleTexting; Klaviyo).

The second is store data. A flash sale to everyone needs only a list. A blast to people who viewed a product but did not buy, or a reminder triggered by an abandoned cart, needs Shopify events flowing into the tool. The third is sending capacity, which depends less on the software than on the number type you send from. The fourth is replies: a blast to 20,000 shoppers invites questions, and every tool handles the inbound side differently.

SMS blast software compared on billing, store data and replies

Read across the rows and two groups appear. SlickText and SimpleTexting are built around texting: the credit is the product, the inbox is part of it, and email lives elsewhere. Klaviyo, Omnisend and Privy are email platforms where SMS is an added channel, so their strength is that one customer profile and one automation builder drive both channels. Neither group is better in general. A store with a large email program and Shopify flows already in a suite may find its blasts easier to run there; a store whose texting is its main channel, or which wants a team inbox with unlimited seats, may prefer a texting tool.

How fast a large SMS blast actually goes out

Speed is set by the number you send from, and the vendors publish useful figures. SlickText describes its included toll-free number as sending 25 to 100+ messages per second, a 10DLC local number as 1 to 75+ per second depending on the carrier Trust Score, and a short code as up to 1,000+ per second. It adds that some carriers limit 10DLC daily volume, starting at 2,000 messages for unvetted brands (SlickText mass texting page). SimpleTexting says its local numbers can reliably message several thousand people per day (SimpleTexting pricing).

For a flash sale with a deadline, that spread matters more than any feature list. At those advertised toll-free rates, the sending calculation for 20,000 messages is about 3 to 13 minutes. That is a throughput estimate, not a promise of arrival on every phone. A local number registered as an unvetted brand may not complete it the same day. Short codes are fastest but carry the highest cost and the longest approval: SlickText quotes $500 to $1,000 a month plus a $1,000 setup fee and 4 to 6 weeks, and SimpleTexting quotes from $1,000 a month and 6 to 8 weeks to provision.

What happens to SMS budget you do not use

Blasts are lumpy. A store might send one campaign in a quiet month and six around a holiday sale, so the rule for unused budget can matter as much as the rate.

A seasonal store on a monthly plan should either size the plan for its normal month and accept a larger bill in peak months, or look at an annual option where credits can be spent across the year. Klaviyo's help center suggests downgrading ahead of a light month for the same reason. For a deeper look at how these pricing models add up across vendors, see our SMS marketing pricing comparison for Shopify.

Deciding who handles the replies to an SMS blast

A blast is one message out and an unknown number of messages back. Shoppers ask whether a size is in stock, whether the code works on sale items, when an order will arrive. Those replies are where a promotion turns into orders or into ignored questions, and the software choice decides who sees them.

Texting tools treat replies as part of the product. SlickText routes replies into a shared inbox with automatic assignment, tags, notes, contact history and auto-replies for common and after-hours questions, with unlimited users on every plan. SimpleTexting includes two-way messaging and free incoming SMS, with three users on every paid plan and $20 a month for each additional teammate (SlickText; SimpleTexting). Compare how each inbox assigns a conversation and how the person or automation answering it retrieves product and order information.

Klaviyo also offers Customer Agent for SMS replies. Klaviyo's help center lists inbound messages as free and outbound conversation messages as billable, so a team that answers every reply pays for each answer (Klaviyo). Its Customer Agent SMS guide describes an AI assistant that answers inbound questions, recommends products and follows configured handoff rules. It needs an active SMS plan and a two-way sending number; resolved conversations and outgoing SMS segments use their respective allowances. For every tool on your shortlist, confirm reply routing, staffing or automation, and escalation before a large blast.

Whichever tool you choose, write down who answers, within what time and with what authority to offer a discount or check an order. Our checkout reply policy template is a starting point. If you want to compare platforms built specifically around two-way conversation, our guide to conversational SMS platforms for ecommerce covers that category.

Where Zobi fits next to your SMS blast software

Buy broadcast software for the campaigns you want to send to a list. Evaluate Zobi for the individual shopper conversations you want handled personally, from a cart reminder through the replies, support questions and next order.

Plan those conversations alongside the broadcast. Suppose your Friday promotion goes to 20,000 subscribers. One shopper replies that the jacket they bought last month came in the wrong colour and asks whether the sale price applies to an exchange. Another left a cart on Thursday. A third bought a coffee machine in the spring and is due for filters. Each of those is a separate conversation that depends on knowing the cart or the order. Zobi connects to your Shopify store and gives each shopper one running thread that remembers the cart, the last reply and what they bought, and in that thread it recovers carts, answers support questions, nudges reorders and suggests add-ons (Zobi for DTC brands). Your concierge writes each message, you approve before it goes out, and replies come back into the same thread for the concierge to handle. It starts on iMessage where possible and uses RCS, SMS, WhatsApp or email when needed.

Choose the combination by the work you want handled: the broadcast, the individual recovery thread, and the replies that require cart and purchase context. If your team answers replies well from a shared inbox and has the time, keep that. If replies to campaigns and cart reminders are going unanswered, or are answered without the order in front of whoever writes back, that is the job to evaluate Zobi on. Bring the replies from your last campaign when you apply and judge Zobi on how it would have handled them.

Apply to have Zobi own the shopper conversations after your campaigns. Free to apply.

An SMS blast software record for your shortlist

The downloadable record repeats the comparison table with source links and adds blank columns for your store: monthly sends, the size of your largest blast, the number type you would use, whether you need Shopify events to trigger sends, and who will answer replies. Fill in the blank columns before any demo, so each vendor answers the same questions about your actual volume rather than a generic one.

Sources

SlickText pricing page and FAQ

SlickText mass texting service page

SlickText integrations

SimpleTexting pricing page and FAQ

Klaviyo pricing

Klaviyo help center: Understand Klaviyo's mobile messaging system

Omnisend help center: Omnisend Pricing Plans 2026

Omnisend pricing page

Privy pricing

Privy for Shopify

Zobi for DTC brands

Klaviyo, Guide to using Customer Agent on SMS

Privy, current billing and SMS credit expiry rules