SMS reaches every phone number, no app install required- push notifications only reach the customers who installed your app, granted permission, and haven't had the OS quietly revoke it. See where each channel actually wins.
Trusted by 10,000+ businesses across India
Trusted by 10,000+ businesses across India
Bulk SMS is text messaging sent at scale through a DLT-registered gateway, reaching any mobile number directly over the cellular network. It needs no app, no notification permission, and no background process staying alive on the recipient's device- the message simply arrives in the phone's default messaging app. Pricing starts from approximately ₹0.09 per SMS on the transactional route.
Push notifications are alerts sent to a mobile app through the device's operating system, appearing on the lock screen or notification tray of a customer who has your app installed. Sending them is free, but delivery only works if the customer installed the app, granted notification permission, and the OS hasn't force-killed the app in the background or quietly revoked that permission since- a chain of dependencies bulk SMS simply doesn't have.
This funnel is the single biggest structural difference between the two channels. Bulk SMS has no equivalent funnel- a valid, DLT-registered number is reachable without any of these steps.
| Aspect | Bulk SMS | Push Notifications |
|---|---|---|
| Step 1 | None- any valid, DLT-registered mobile number can be sent an SMS immediately. | Customer must first discover, download, and install your app- a step many potential customers never complete. |
| Step 2 | None- transactional and service SMS need no separate permission beyond a valid number. | Customer must actively grant notification permission, either during onboarding or when prompted- a request a meaningful share of users decline or dismiss. |
| Step 3 | None- delivery doesn't depend on the phone's OS or background app state. | The OS must not have force-killed the app in the background or revoked the permission over time, which happens routinely on battery-optimised Android devices and after long periods of inactivity. |
| Net result | Delivery to the phone is near-universal for any valid number, independent of app behaviour. | Only the customers who survive all three steps- install, permission, and a live, permission-intact app- ever see the notification at all. |
Push notifications carry no per-message fee, while bulk SMS runs from approximately ₹0.09 per SMS. But push's free sending sits on top of a real acquisition cost- getting someone to install your app and grant permission in the first place.
| Aspect | Bulk SMS | Push Notifications |
|---|---|---|
| Cost to send | A small per-message cost, from approximately ₹0.09 per SMS on the transactional route. | Free to send- push infrastructure has effectively no per-message cost. |
| Cost to reach someone | The per-message cost is the whole cost- no separate spend is required to make a phone number reachable. | Free sending hides a real upstream cost- acquiring the install through paid marketing or app store optimisation, then getting the user through the permission prompt- before a single notification can ever be delivered. |
| Cost if the channel goes unused | None- an unsent SMS costs nothing, and there's no sunk acquisition cost tied to the channel itself. | The app install and onboarding investment is sunk whether or not the user ever grants permission or keeps the app installed. |
| Practical takeaway | Cost scales directly and predictably with messages actually sent. | Cost is front-loaded into user acquisition- the notification itself is free, but reaching someone with one usually isn't. |
Cart reminders, in-app promotions, and feature nudges for users who already have your app installed and active work well as push- fast, free, and contextual to what they're doing.
OTPs, payment confirmations, delivery updates, and other transactional messages belong on SMS, where delivery doesn't depend on an app being installed or permission being granted.
Not every customer will download a business app, and many businesses don't have one at all- SMS reaches this entire segment that push notifications structurally cannot.
A common pattern: push notifications for engaged, already-installed users, with SMS as the fallback or complement that reaches everyone else, especially for anything transactional.
Even after a customer installs your app and grants notification permission, that permission isn't permanent. Aggressive battery optimisation on many Android devices can force-kill background apps, users can revisit and disable notification settings, and long stretches of inactivity often trigger the OS or the user to switch permissions off entirely. Each of these is invisible to the business sending the notification- it simply never arrives, with no bounce or error to flag the drop-off. Bulk SMS has no equivalent decay mechanism: a valid number stays reachable unless it's deactivated by the operator.
Reaches any valid mobile number- no app install required at all
No notification-permission gate to clear before delivery
Not affected by the OS silently revoking background permissions over time
From approximately ₹0.09 per SMS on the transactional route, DND-exempt for transactional content
Works identically whether or not the recipient has ever heard of your app
Carries a small per-message cost, unlike push's free sending
Plain text only- no rich in-app deep linking or interactive UI
Less suited to high-frequency, low-stakes nudges than push is
Free to send, with no per-message cost once infrastructure is set up
Can deep-link directly into a specific in-app screen or action
Well suited to frequent, low-stakes engagement nudges for active users
Rich formatting and interactive actions on supported platforms
Only reaches users who installed the app in the first place
Requires an explicit notification-permission grant, which a meaningful share of users decline
The OS can silently revoke or throttle permission over time, especially on Android battery optimisation
Delivery stops entirely the moment a user uninstalls the app
Has a real, often significant acquisition cost baked into getting someone through the install-and-permission funnel
The common, sensible pattern is to run both together- push notifications for engaged app users, bulk SMS as the fallback and complement for everyone else, especially transactional messages. For businesses also weighing WhatsApp, our Bulk SMS vs WhatsApp comparison covers that channel too, and our blog looks at WhatsApp vs Push Notifications for a related angle on the same reach-versus-app-dependency trade-off.
Trusted by 10,000+ businesses across India for DLT-compliant messaging that reaches customers regardless of app install status.
Transactional templates registered on TRAI DLT with confirmed DND-exempt routing for OTPs and time-critical alerts.
Reach every valid mobile number directly, with no install funnel or permission gate standing between you and the customer.
Track delivery status and campaign performance from one dashboard, independent of app-side permission attrition.
Trigger bulk SMS as a fallback when push delivery can't be confirmed, through one straightforward API.
Talk to our experts about running push and bulk SMS together, with SMS as the guaranteed-delivery fallback.
Big or small, we power communication for all- talk to us today.
Bulk SMS reaches any valid mobile number directly over the cellular network, with no app, install, or permission step required. Push notifications only reach customers who have installed your app, granted notification permission, and haven't had that permission silently revoked by the OS over time. SMS wins on guaranteed, universal reach; push wins on cost-free, in-app-contextual engagement for users who've already cleared that funnel.
Get Click Media runs guaranteed-delivery bulk SMS for 10,000+ Indian businesses- request a demo and we'll map out where push fits alongside it.
