SMS vs email open rate: why 98% beats 20% and what follows
A marketing email's open rate is about 20%; an SMS — about 98%, mostly within the first three minutes of delivery. This gap is not cosmetic; it changes how you design critical and sales communication. Let us break it down and turn it into real budget decisions.
Where the gap comes from
An SMS lands straight on the lock screen — no spam filters, no "Promotions" folder, no "Notifications" tab. The phone buzzes, the user looks. Email fights for attention in an inbox holding hundreds of unread messages, where provider algorithms decide whether it even reaches the primary tab. For a message that must arrive — a 2FA code, a security alert, a payment confirmation, an appointment reminder — SMS has no real competition. Push can work, but only if the user has the app, opted in to notifications and has internet. SMS has none of those preconditions.
Not just open rate — reaction time counts
Openability is not everything. SMS is also read almost immediately: the median is a few minutes, while email is opened hours or days later — or never. For time-sensitive communication (a code that expires in 5 minutes; an offer valid until midnight) that speed matters as much as the open itself.
When SMS, when email
It is not "either-or". Each channel has its role:
- SMS — urgent, short, action-required: 2FA codes, status notifications, alerts, reminders, flash sales.
- Email — long, visual, archival: newsletters, invoices, documentation, education.
The best results come from combining both in one scenario — e.g. an email with the full offer and an SMS reminder of its end.
The cost of effective reach
SMS costs more per unit than email — and here many companies err, comparing the cost of sending instead of the cost of effective reach. If email is read by 20% and SMS by 98%, you must send nearly 5× more emails to reach the same number of readers. Once openability is factored in, the cost per actual reader is often comparable or lower on the SMS side. Calculate it for your case in the calculator.
How to squeeze the most from 98%
High openability is potential, not a guarantee of conversion. To use it: one clear CTA per message, a recognizable Sender ID, a short tracked link, the right segment and the right hour. SMS gives you the certainty the message is read — copy quality does the rest. A test account with 100 free SMS is on the sign-up page.
FAQ
Is the 98% SMS open rate a real number?+
Yes, it is a widely reported level for SMS, with most reads in the first minutes after delivery.
Will SMS replace email marketing?+
No — it complements it. SMS for urgent and short, email for long and visual. Best combined in one scenario.
Isn't SMS too expensive compared to email?+
What matters is the cost of effective reach, not the cost of sending. At 98% vs 20% openability, the cost per reader is competitive on the SMS side.