You have a message to send to your users. Maybe it is a shipping update, maybe a flash sale, maybe a security code. The first decision you face is simple: push notification or SMS?
Both channels reach a phone screen and trigger action, but they differ in function, cost, and purpose. Using the wrong one wastes money or fails to reach users.
This guide explains how each channel works in plain terms, when to use which, and how to combine them. We will use Pushwoosh as a reference throughout because it handles both push and SMS on a single platform, making the comparison easier to illustrate.
Push notifications: what they are and how they work
A push notification is a short message that pops up on a phone’s lock screen or in the notification shade. It comes from an app (mobile push) or a website (web push). The user does not need to be inside the app to see it.
Mobile push requires your app to be installed, notification permissions granted, and an internet connection. The message travels from your server to APNs (iOS) or FCM (Android), then to the device.
Web push works through the browser. The user clicks “Allow” on a permission prompt, and from that point, they can receive messages even when they are not on your site. An internet connection is still required.
What makes push useful for marketers: you can attach images, GIFs, action buttons, and deep links that take the user to a specific screen in your app. All of this is included in your platform subscription. There is no per-message fee.
SMS: what it is and how it works
SMS (Short Message Service) is a plain-text message sent to a phone number over the cellular network. Each message holds up to 160 characters. If you go over that, it splits into segments, and you pay for each one.
The key difference from push: SMS does not require internet or an app and works on every phone with a SIM card — even a basic Nokia from 2005. This is why it remains the default channel for anything that must be delivered.
A few other things to know:
- Two-way by default. Users can reply in free text. Good for appointment confirmations or support.
- Universal reach. Any active phone number, anywhere.
- Strict consent rules. In the US, the TCPA requires a written opt-in (usually double opt-in). GDPR has similar requirements in Europe.
- Per-message cost. Rates vary by country and volume, but they add up at scale.
Side-by-side comparison
| Feature | Push notifications | SMS |
|---|---|---|
| How it travels | Over the internet (APNs, FCM) | Over the cellular network |
| Needs internet? | Yes | No, just a cell signal |
| Needs your app? | Yes (app install or browser opt-in) | No, any phone number works |
| What it looks like | Rich: images, buttons, deep links | Plain text, 160 chars per segment |
| Cost to send | Usually included in the platform fee | Per-message charge |
| Can the user reply? | No (action buttons only) | Yes, free-text replies |
| Who you can reach | Your app/web subscribers | Anyone with a phone number |
| Personalization | Deep: behavioral, RFM, location, events | Basic: name, order number |
| Analytics | Full funnel: opens, CTR, conversions, revenue | Delivery + link clicks |
| Consent rules | App or browser permission prompt | Strict: written opt-in (TCPA, GDPR) |
In short: push is richer and cheaper, SMS is more reliable and reaches further. The question is not which one is “better.” It is which one fits the message you are sending right now.
When to send a push notification
Push works best when the user already has your app, and you want to bring them back into it. The cost is effectively zero per message, so you can experiment freely.
Abandoned cart reminders. A push 30–60 minutes after someone leaves items in their cart, with a deep link straight back to checkout, is one of the simplest high-ROI automations in e-commerce.
Flash sales and promotions. Rich media catches the eye. A product image, a countdown, and a “Shop now” button do more than 160 characters of plain text ever could.
Daily engagement hooks. Login bonuses in games, streak reminders in fitness apps, morning briefings in news apps. Push keeps the daily habit alive.
Feature announcements. You ship something new, you push it. A deep link takes the user right there.
Personalized recommendations. Combine what you know about user behavior (browsing history, purchases, content preferences) with dynamic content to send suggestions that feel relevant rather than random.
Real examples by industry:
- Mobile games (justDice): lapsed player reactivation, daily reward reminders, limited-time in-game offers
- E-commerce (FloSports): price drop alerts, back-in-stock, loyalty program updates
- News and media (wetter.com): breaking news, personalized topic digests
- Fintech (AvaTrade, EXMO): new feature walkthroughs, spending summaries, onboarding nudges
When to send an SMS
SMS costs money per message, so it needs to earn that cost. It does, in three situations: when delivery is non-negotiable, when the user does not have your app, or when the message is so time-sensitive that you cannot risk it sitting in a notification queue.
OTPs and two-factor authentication. Security codes need to arrive on any device, instantly. SMS is the standard.
Fraud and account alerts. “Suspicious login from a new device. Reply YES if this was you.” This is not a message you want stuck behind a Wi-Fi reconnection.
Appointment and delivery reminders. Healthcare, logistics, beauty, automotive. SMS reply-to-confirm flows reduce no-shows without requiring users to open an app.
Order confirmations and shipping updates. Users expect these on SMS. It is the channel they check for transactional messages.
Fallback for unreachable users. If a push notification goes unread for a few hours and the message matters, SMS catches what push missed.
Real examples by industry:
- Fintech (Alinma Bank, ONE.co.il): 2FA codes, fraud alerts, large-transaction confirmations
- Delivery and transportation: driver ETAs, delay notifications, pickup confirmations
- E-commerce: payment reminders, shipping status, urgent flash sales for non-app users
How to combine push and SMS without overloading users
Most marketers do not need to choose one channel. They need a system that selects the right one for each message.
The usual approach: push first, SMS as fallback. Push is free and rich for most cases; SMS is for critical messages or unreachable users.
A typical flow in Pushwoosh’s Customer Journey Builder:
- User triggers an event (abandons cart, misses a payment, hits a milestone).
- Pushwoosh sends a push notification.
- Wait 1–2 hours. Did they open it?
- If not, send an SMS with a shorter version of the same message.
This keeps costs down while making sure nothing important gets lost. The Customer Journey Builder handles this logic visually: drag-and-drop triggers, wait conditions, channel splits, and reachability checks.
Pushwoosh also uses AI to learn which channel works better for which segment. Some users respond to push in the evening. Others open SMS in the morning. The system adjusts timing and channel selection automatically over time.
Making messages relevant: segmentation basics
The channel is half the equation. The other half is making sure the content matches the person receiving it. Three approaches matter most:
Behavioral segmentation. Track what users actually do: purchases, page views, feature usage, login frequency. Then group them by behavior. A user who browsed hiking boots but did not buy gets a push with a discount on that category. A high-value user who has gone silent for two weeks gets an SMS win-back offer. Pushwoosh Tags and Events handle this.
RFM segmentation. Score users by Recency (last activity), Frequency (how often they engage), and Monetary value (how much they spend). High-RFM users get early access and VIP offers via push. Low-recency users get a re-engagement SMS before they churn. Pushwoosh has RFM scoring built in.
Dynamic content. Insert user-specific data into templates: name, city, last purchase, favorite category. A 160-character SMS that says “Your Nikes shipped, Alex” feels different from “Your order has shipped.” Pushwoosh supports dynamic content in both push and SMS templates.
Quick decision framework
When you are not sure which channel to use, run through these questions:
Does the user have your app? If yes, push is your default. If not, SMS is the only direct option.
Is this message critical? Security alerts, OTPs, fraud notifications, appointment reminders. If it must arrive regardless of internet status, use SMS.
Do you need rich content? Images, buttons, deep links? Push. Is plain text enough? Either channel works; push saves money.
Do you need a reply? Support flows, confirmations, surveys? SMS supports free-text replies natively.
What is your budget? Push is free per message. SMS costs per segment. For high-volume promotional campaigns, push is cheaper. For low-volume critical messages, SMS is worth the cost.
Most teams end up using push for engagement and promotions, SMS for transactional and critical messages, and a fallback flow that connects the two.
Turn channel decisions into automated workflows with Pushwoosh
Knowing the difference between push notification and SMS is the starting point. The real value comes when you stop choosing manually for every campaign and let the platform handle it: send push first, fall back to SMS if needed, adjust timing by segment, personalize content by behavior.
That is what Pushwoosh does. One platform for both channels, with behavioral segmentation, RFM scoring, dynamic content, AI-powered timing, and a visual Customer Journey Builder that handles the logic without code.
