Web Push vs SMS for Ecommerce: Which Channel for Which Job: Trinacle

Web push and SMS both reach the customer’s screen in minutes, and they get compared constantly because they look like competitors. They are not. They are two different tools with different costs, different reach, and different jobs, and the stores that win run both with clear divisions between them. We operate both channels, including web push on WooCommerce. Here is the honest comparison.

The one-line difference

Web push reaches people who clicked “allow” in a browser, costs almost nothing per message, and disappears if they clear browser data or switch devices without subscribing again. SMS reaches any phone number that gave written consent, costs per message, and lands no matter what app the customer is using. Reach and cost point in opposite directions, which is why the division of labor matters.

Opt-in and reach

Web push opt-in is one click: a branded card in the corner of the storefront, no forms, no phone number typed. That makes the list grow fast, but the audience is browser-bound and per-device. A subscriber on their laptop does not get the message on their phone.
SMS opt-in is written consent: a checkout checkbox or keyword signup, carried by regulation. The list grows slower, but each subscriber is reachable on the device that is always in their pocket.

The pattern in practice: push lists get big quickly and cheaply; SMS lists get smaller but convert like it.

Cost

Web push is nearly free per message. No carrier fees, no per-send charges at meaningful scale. This is why push handles high-frequency, low-stakes messages without anyone auditing the budget.
SMS costs per message and carries compliance overhead (written consent, A2P 10DLC carrier registration with 1-3 day approvals, STOP/HELP handling). The compliance is not optional, and it is exactly why SMS traffic that is properly registered lands while shortcuts get filtered.

The jobs each channel does best

Web push jobs:

Back-in-stock and price-drop alerts. Instant, product-specific, free to send to however many subscribers want that SKU’s alert.
Flash sale start notifications. The window opens, the alert lands, even with no browser tabs open.
Order and shipping updates for stores that want speed without SMS costs.
Light winback. One gentle nudge for shoppers quiet 45+ days, where an SMS would feel heavy.

SMS jobs:

Abandoned checkout recovery. The intent window is 48 hours and the customer’s phone is the fastest route back.
Time-sensitive drops and restocks where the audience is on phones and the window is measured in minutes.
Two-way conversations. A real business line customers can text back: fitment questions, “is this in stock”, support starts. Push cannot do this.
Review requests timed after delivery, where the reply rate carries the program.

The compliance asymmetry

Push needs a click; SMS needs written consent, carrier registration, quiet hours and STOP/HELP handling. Neither is hard when the machinery exists, but they are not the same level of obligation, and stores that treat SMS like push (blast first, paperwork later) end up in the filtered-traffic guide. Consent is tracked per customer per channel either way; the channels never share a permission.

The division of labor that works

Push: frequent, instant, product-triggered alerts to a big cheap list.
SMS: moments that justify the channel, to a consented list that expects them.
Email: everything that needs more than 160 characters, carrying the story and the full catalog.

The mistake is not picking wrong; it is sending the same message on both channels at the same moment to the same customer. Tag by channel opt-in, sequence or dedupe, and let each channel do its own job.

Fairness check

Push has a real weakness: it is device-bound and browser-bound, so it quietly shrinks as people switch phones. It will never replace SMS reach, and stores whose customers are overwhelmingly mobile should weight SMS higher despite the cost. And push is not SMS-style marketing: it is alerts. Treating it like a texting channel gets opt-outs and browser notification blocks, which are forever.

How Trinacle runs this for you

Web push on your storefront: branded opt-in card, campaigns with image and buttons, automated alerts (back-in-stock, price drops, order updates, abandoned cart sequences, light winback). See Trinacle SMS for the channel family and the free WooCommerce modules for what runs at $0.
SMS on a registered business line: A2P paperwork handled, two-way threads, STOP/HELP automatic, with the recovery and retention sweeps from the automation guides.
Revenue attributed per campaign on both channels, reported monthly in dollars. See money tracking.

Plans start at $315/mo, flat, no contracts. See how it works.

Push is the siren, SMS is the handshake. Pick a plan and run both properly.