Email and SMS are the two channels most US businesses use to reach customers directly, and they are not interchangeable. This is a fair comparison of what each does well, what each costs, what consent each requires and how to run them side by side.
Reach and attention
Email reaches almost everyone. Nearly every customer has an address, lists are cheap to build and there is no practical limit on how many people you can mail. The catch is the inbox itself. Your message lands among dozens of others, often in a promotions tab, and competes for attention with everything else that arrived that day.
SMS reaches fewer people because you can only text customers who gave you express consent. Lists are smaller and slower to grow. But when a text arrives, it is read. Most texts are opened within minutes, which is far higher than typical email open rates. The phone buzzes, the preview shows on the lock screen and there is no promotions tab to hide in.
So the trade is simple. Email gives you breadth. SMS gives you attention. Which one matters more depends on what the message needs to do.
Speed, length and format
Email is slow by design and that is fine. People check it when they choose to, often in batches, and a message sent in the morning may be read that evening or on Monday. In return, email gives you room: long copy, images, product grids, multiple links, a full layout you control.
SMS is immediate. A text sent at noon is read at noon. The cost of that immediacy is space. A standard text is a few short sentences, and anything longer is split into segments and billed as more than one message. Links work, and MMS allows an image, but the format is one short, direct line of text.
That shapes what each channel is for. Email carries the story: a product launch with photos, a newsletter, a detailed offer with terms. SMS carries the moment: the sale ends tonight, your order shipped, your table is ready, your code is 482913.
Cost per message versus cost per contact
The two channels are priced differently, and that difference catches people off guard.
Email platforms usually charge by list size. You pay a monthly fee based on how many contacts you store, and sending more often costs little or nothing extra. The cost per message drops as you send more, which is why email lists get mailed weekly or daily.
SMS is priced per message. On Xeebi, toll free messaging is $0.009 per message and 10DLC is $0.008 per message, all in, with no hidden carrier pass through. The Mobius campaign manager adds a platform fee of $0.001 per message. The Flex plan has no monthly fee, so a small list costs almost nothing until you send.
The practical result: email is cheap to send often to everyone, and SMS makes you choose. Every text has a price, so each one should earn its place. That discipline is a feature. Lists that only get texts worth reading stay subscribed. See the pricing page for current rates and plans.
Consent: opt out versus express consent
This is the biggest difference between the channels and the one with real consequences.
US email rules are built around opt out. You need an honest subject line, a working unsubscribe link, a physical mailing address and prompt handling of removal requests. Prior permission helps deliverability and reputation, but the law centers on letting people leave.
US text messaging rules are built around opt in. Under the TCPA, marketing texts require express consent from the recipient before you send anything, and for marketing that consent is generally expected in writing, such as a checkbox, a keyword reply or a signed form. You must honor STOP immediately, respond to HELP and keep a record of how and when each person agreed. On top of the law, carriers require registration: 10DLC brand and campaign registration for local numbers, and toll free verification for toll free numbers.
None of this is legal advice. Consent rules have detail that depends on your program, so talk to counsel before you launch. The short version: treat your SMS list as borrowed trust. People gave you their phone number, which is more personal than an email address, and they can take it back with one word.
Measurement
Email gives you opens, clicks, unsubscribes and replies. Open tracking has become less reliable as mail clients block tracking pixels, so clicks and conversions are the numbers to lean on.
SMS gives you delivery status, replies, STOP requests and clicks on any link you include. There is no open tracking, but there does not need to be. If a text was delivered, it was almost certainly seen. The useful question is whether it drove the action, so use a unique link or a code per campaign and measure the result on your site or at the register.
For both channels, the measure that matters most is the same: did the person do the thing you asked? Build the campaign around one action and measure that.
When each wins, and how to run them together
Email wins when the message needs depth, visuals or time to be read. Newsletters, product education, long offers, receipts with line items, anything a customer may want to search for later.
SMS wins when timing matters more than detail. Flash sales, appointment reminders, order and delivery updates, back in stock alerts, verification codes, and short follow ups where a reply is welcome.
The strongest programs use both, with a clear job for each. Email carries the full story earlier in the week. SMS lands at the moment of decision: the day the sale ends, the hour the doors open, the minute the order ships. The text does not repeat the email. It points to it, or to the one action that matters now.
A simple pattern: announce by email, remind by SMS, confirm by SMS, follow up by email. Keep the SMS cadence low so each text stays an event, and keep the two lists separate with their own consent records. Xeebi's Mobius campaign manager handles the SMS side: scheduling, segmenting, STOP handling and delivery reporting from one place.
A simple decision checklist
Before each campaign, run the message through these questions.
- Does it need to be read today? If yes, SMS. If it can wait, email.
- Does it need images, a layout or more than a few lines? If yes, email.
- Is there one clear action for the reader? If yes, either works. If there are several, email.
- Do you hold express consent to text these people? If no, email only until you do.
- Is the list large and the message routine? If yes, email keeps cost per contact low.
- Is this the moment of decision for the customer? If yes, SMS.
Most messages sort themselves quickly. The ones that pass both tests are often best as a pair: the email that explains and the text that reminds.
If you already run email and want to add SMS the right way, start with the list you have express consent for and one campaign where timing is the whole point. Set it up on the get started page, or text 1 888 889 3304 and we will help you choose the route.
Frequently asked questions
Is SMS better than email for marketing?
Neither wins outright. SMS wins on speed and attention. Email wins on depth, format and cost per contact. Most businesses get the best results running both with a clear job for each.
Do I need permission to send marketing texts?
Yes. In the US, marketing texts require express consent from the recipient before you send, and you must honor STOP requests. Email rules center on a working opt out instead. Talk to counsel about your specific program.
How much does an SMS campaign cost?
SMS is priced per message. On Xeebi, toll free messaging is $0.009 per message and 10DLC is $0.008 per message, all in. Mobius, the campaign manager, adds a platform fee of $0.001 per message.
Should I send the same message by email and SMS?
No. Use email for the full story and SMS for the moment that needs attention now. Sending identical content on both channels trains people to ignore one of them.
