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Best SMS marketing companies: the consent stack is the product, so compare how each one handles it before you compare price

Every text platform can send a message. The difference between them is how they collect consent, prove it later, and handle the opt out. Here is the checklist to run on any vendor and the per message arithmetic that decides the real cost.

Published by AI Knows Us · Updated 27 October 2026

SMS platforms look interchangeable on a feature list and are not. The thing you are buying is a consent record you can produce two years later, an opt out that works without a human, and a sending identity that will survive a carrier review. Every vendor will send a message; a small number will hand you the evidence that you were allowed to. Compare that first, then compare price, because the per message rate is the smaller number in almost every programme.

The checklist, in the order it matters

CheckWhat to demandWhy it comes before price
Consent captureA record per subscriber: the exact wording shown, the timestamp, the source, the IP or device where applicableWithout the wording and the timestamp, you have a list rather than a permission
Consent exportThe ability to export that record yourself, as a fileA record you cannot export is a record you do not control
Opt out handlingAutomatic honouring of the standard keywords, instantly, across every campaign and automationOne missed opt out is the whole problem in this channel
Sending identityWhich number type is used, how it is registered, and who owns the registrationAn unregistered or wrongly classified sender gets filtered rather than warned
Message class separationMarketing and transactional messages kept on separate flows and separate consentMixing them puts your order confirmations at risk alongside your promotions
Then pricePer message, per segment, inbound and outbound, plus the platform feeVolume arithmetic, once the five rows above pass

Rows one and two are the ones to be stubborn about. A platform that stores the consent wording and timestamp and lets you export both has given you the only artefact that matters if the permission is ever questioned.

The arithmetic that decides the real cost

A text is billed per segment, not per message, and a long message is several segments. Add an emoji or a special character and the segment length drops sharply, which means one character can double the cost of a campaign. Inbound replies are usually billed too, so an engaging message is more expensive than an ignored one.

So the honest cost model is: expected segments per message, multiplied by list size, multiplied by sends per month, plus inbound, plus the platform fee. Build it in a spreadsheet with your real message lengths before you read any vendor pricing, because that model tells you which pricing structure is cheaper for you specifically. We reproduce vendor prices on this site with their date. What sets the tier at every vendor in this category is the same three things: monthly message volume, how many sending numbers you need, and whether automation and segmentation are included or sold above the base.

Three vendor types, and who each suits

  • Ecommerce platform apps. Built around a store, so the product, cart and order data is already there. Strongest where the message is tied to a purchase event.
  • Standalone marketing platforms. Channel breadth and better segmentation, with the integration work left to you.
  • Communication platforms sold to developers. The cheapest per message and the most work, because you build the consent interface, the opt out logic and the reporting yourself. Only worth it with engineering capacity.

For a worked example of the first type with real listings checked on a date, see SMS marketing apps for Shopify. For what the channel is actually good at, our page on the benefits of SMS marketing sets out eight of them and what each one needs. For how text fits beside the other mobile channels, native advertising on mobile has no durable inbound link from any other page here: measured on 21 October 2026, 962 of the 2,082 pages live on this site carry no durable inbound link from any other page.

What a text message cannot reach

SMS reaches people who already gave you their number, which makes it the best retention channel most businesses own and no help at all in acquisition. The person who has never heard of you is somewhere else entirely, and increasingly that somewhere is an assistant: they ask which supplier to use in their category, and the answer names two or three businesses in prose.

No messaging platform reports on that, and in a 597 reading audit of ChatGPT and Gemini, review directories accounted for 0.8 percent of all cited sources, so the usual listing work does not reach it either. We sell the measurement: a dated, repeatable reading of which businesses the five assistants name when a buyer asks who to buy from, with your own name absent from every prompt so the answer is not primed. We send no messages and hold no lists. Every platform above is ahead of us on the job this page is about.

Questions about SMS marketing companies

How do I collect consent properly?

Ask for the number for a stated purpose, show the wording that says what will be sent and how often, store that wording with a timestamp, and confirm with a first message that includes how to stop. Keep the record exportable.

What does SMS marketing cost per message?

It is billed per segment and varies by country and number type, and inbound replies are usually billed as well. Build the segment model on your own real messages before you compare any vendor price, because message length moves the total more than the rate does.

Can I use the same number for marketing and order updates?

You can and it is a bad idea. Keep the flows and the consent separate so a marketing complaint cannot interrupt the messages customers actually need.

How often should I send?

Less than you want to. Set the frequency in the opt in wording and stay inside it, because this channel punishes over sending faster than any other: the unsubscribe is one word and the cost of annoying somebody is losing the number permanently.

Which vendor type should a small business choose?

If you sell on a platform, the platform app, because the purchase data is already connected. If you do not, a standalone marketing platform. Only go to a developer focused communication platform if you have engineering time to build the consent and opt out layer yourself.

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