SMS vs email marketing
Roughly 98% of text messages are read within three minutes, while about 20% of marketing emails get opened at all, and a fifth of the rest land in a spam folder. Below is a side-by-side comparison of SMS vs email marketing, including where each channel works best.
SMS vs email at a glance
These are widely cited industry averages. Your own results will depend on list quality, the offer, and timing, but the gap between SMS and email is consistent across nearly every category.
Texts arrive on the lock screen and get opened within minutes. SMS costs more per message but earns a higher reply rate, with no spam folder.
Email is cheap per message, has room for long copy and images, and works well for staying in touch over time. The tradeoffs are lower open rates, longer response times, and real spam-filter risk.
Detailed SMS vs email comparison
SMS does not win every row. Email is cheaper per message and can carry longer copy and richer layouts. Choose the channel by the job, not by which team is sending.
| Metric | SMS | Edge | |
|---|---|---|---|
| Open rate | 98% | ~20% | SMS |
| Reply rate | 45% | ~6% | SMS |
| Avg. response time | 3 minutes | ~90 minutes | SMS |
| Click-through rate | 19% | ~2.5% | SMS |
| Character limit | 160 / segment | Unlimited | |
| Rich media | MMS images only | Full HTML / CSS | |
| Per-message cost | $0.06 | ~$0.001 | |
| Spam / delivery risk | Rare | ~20% filtered | SMS |
| Time sensitivity | Excellent | Poor | SMS |
01 | When SMS marketing wins
If the message needs someone to act in the next hour, send it as a text. An email waits until the person opens their inbox, while a text gets their attention right away, which is useful when the content justifies it.
02: When email marketing wins
Email carries what SMS can't: detailed policy explainers, product catalogs, receipts, contracts, and the monthly newsletter people actually keep. When the cost of each message matters more than how quickly it is read, email is the cheaper choice.
How to use SMS and email together
You do not have to choose between SMS and email. The more useful question is which channel should carry each message, and in what order.
Send the long-form newsletter, policy brief, or product reveal over email. Text a short reminder to check the inbox. The email's open rate rises when the text arrives first.
Ask for email and phone on the same form, with separate consent checkboxes. Send each message through the channel the recipient actually reads.
Send "Donation match ends tonight. Reply to help" by text, then follow up with an email that covers the match, the request, and the giving levels in full. The text prompts the click, and the email makes the full case.
If your email had a 15% open rate, the other 85% didn't see it. A short SMS ("we sent you something, check your inbox") reaches a real share of those people.
SMS compliance vs email compliance
/01
Fines under the TCPA (the federal Telephone Consumer Protection Act) run $500 to $1,500 per message sent without prior express written consent. Penalties under CAN-SPAM, the federal email law, are typically lower and less aggressively enforced.
/02
The phone carriers (such as AT&T, Verizon and T-Mobile) slow down or block unregistered senders before a single message arrives. Problems with email reaching the inbox are milder by comparison.
/03
Sends must fall inside a strict 8 a.m. to 9 p.m. window in the recipient's local time zone. Email has no equivalent legal restriction.
/04
STOP replies must be honored immediately across every campaign. CampaignCNX+ handles this automatically across the platform, so you do not have to track opt-outs by hand.
SMS vs email FAQ
We wouldn't recommend it. SMS is the better channel for anything time-sensitive or conversational; email carries long copy and rich layouts at a fraction of the cost. The strongest programs use both and choose the channel deliberately for each message.
SMS is far less prone to it. The opt-out rate for well-run SMS programs sits around 1%, and the inbox isn't crowded the way an email inbox is. Overuse still wears out a list, so treat every send as a real cost, because on SMS each message is billed.
Per message, yes: $0.06 on pay-as-you-go SMS vs. ~$0.001 for a bulk email send. Per conversion (each person who takes the action you want), SMS usually comes out ahead, because a 19% click-through rate against email's 2.5% tends to cover the higher cost.
You can text only the contacts who gave you explicit, prior express written consent to text. An email opt-in isn't automatic SMS consent. Add a clear SMS opt-in the next time people sign up or buy (web form, checkout, text-to-join) and move the list over gradually.
Add SMS marketing to the mix
Every new account gets 100 free SMS credits and no contract. Your number is $5 a month. Import a small part of your list, send one message, and compare the open-rate results directly with last month's email campaign. Carrier review of a new toll-free number takes about three business days. Once your message goes out, the difference usually shows within an afternoon.
