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. Here's the honest side-by-side comparison of SMS vs email marketing, and where each channel actually wins.
SMS vs email at a glance
These are widely-cited industry averages. Your program's mileage depends on list quality, offer, and timing — but the gap between SMS and email is consistent across nearly every category.
Delivered to the lock screen. Opened in minutes. Higher per-message cost, higher reply rate, zero spam folder.
Cheap per message, room for long copy and images, strong for ongoing nurture. Lower open rates, longer response time, real spam-filter risk.
Detailed SMS vs email comparison
Not every column is a win for SMS — email is cheaper per send and carries more copy and rich layouts. Pick the channel per job, not per team.
| 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 to move someone in the next hour, it belongs on a text. Emails wait for an inbox session. Texts interrupt — usefully, 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 cost-per-send matters more than time-to-read, email is the cheaper shot.
How to use SMS and email together
SMS and email aren't a one-or-the-other choice — the real question is which marketing channel carries which 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. Open rate on the email climbs when the SMS lands first.
Ask for email and phone on the same form, with separate consent checkboxes. Route each message to the channel the recipient actually reads.
"Donation match ends tonight — reply to help" by text. Full breakdown of the match, the ask, and the ladder in a follow-up email. The text gets the click; the email gets the close.
If your send pulled a 15% open rate, the other 85% didn't see it. A short SMS — "we sent you something, check your inbox" — recovers a real percentage of that list.
SMS compliance vs email compliance
/01
$500–$1,500 per message sent without prior express written consent. Email's CAN-SPAM penalties are typically lower and less aggressively enforced.
/02
Unregistered senders get throttled or blocked at the carrier layer before a single message arrives. Email deliverability issues are milder by comparison.
/03
Strict 8 a.m.–9 p.m. send windows 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 it at the platform level so missed opt-outs aren't a manual risk.
SMS vs email FAQ
No. 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 operators who win use both, on purpose, per message.
Much less. 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 burns the list — treat every send like it costs something, because on SMS it does.
Per message, yes — $0.06 on pay-as-you-go SMS vs. ~$0.001 for a bulk email send. Per conversion, the math usually flips. 19% click-through vs. 2.5% click-through tends to carry the cost.
Only for 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 at your next touchpoint — web form, checkout, text-to-join — and migrate the list over time.
Add SMS marketing to the mix
Every new account gets 100 free SMS credits — no card and no contract. Import a small slice of your list, ship one message, and compare the open-rate math directly to last month's email campaign. The difference usually shows up inside an afternoon.
