OneSignal vs Twilio: Push, SMS, and the Cost of Each

• OneSignal and Twilio look like competitors but sit in different categories. OneSignal is a push-first engagement platform priced by subscriber. Twilio is messaging and voice infrastructure priced by usage.
• Channel coverage barely overlaps. OneSignal centers on push and in-app with email and SMS added on. Twilio centers on SMS, voice, WhatsApp, and RCS, sends email through SendGrid, and has stepped back from offering a dedicated push product.
• The cost works in opposite directions. OneSignal's push is close to free at low subscriber counts, while Twilio charges per message and layers on carrier fees, number rental, and US A2P 10DLC registration.
• If your real need is push with a little email or SMS, a push-first tool like Pushfire covers it without the telecom overhead. Twilio earns its cost when SMS or voice at scale is the actual point.

OneSignal and Twilio show up on the same shortlist more often than they should. Both send messages, so they land in the same search, though they were built for different jobs. OneSignal started as push notifications and grew into an engagement platform. Twilio is the messaging and voice infrastructure that a large share of apps send through. Comparing them well starts with what you are actually trying to send.

• OneSignal: a push-first customer engagement platform. Channels are push, in-app, email, and SMS. Pricing is free for mobile push up to around 10,000 subscribers, then subscriber-based plans plus per-channel usage. Best for push-led engagement and lifecycle messaging.
• Twilio: messaging and voice infrastructure, a CPaaS. Channels are SMS, MMS, voice, WhatsApp, RCS, email through SendGrid, and verification. Pricing is pay-as-you-go per message and per minute, plus carrier fees, number rental, and US A2P 10DLC registration. Best for SMS, voice, and omnichannel at scale.
• Pushfire: a push-first workflow builder on FCM. Channels are push across iOS, Android, and web, with email and SMS connectors on the paid tier. Pricing is free to 5,000 subscribers, then $29 a month to 50,000. Best for push-first messaging without telecom overhead.

The gap shows up the moment you list what each one sends. OneSignal is built around push notifications and in-app messages, with email and SMS bolted on as extra channels you can turn up when you need them. It is a strong fit if push is the channel that carries most of your engagement.

Twilio is the other way around. Its home turf is SMS, and it reaches out from there into voice, WhatsApp, RCS, and verification flows, with email handled by SendGrid, which Twilio owns. What Twilio does not give you is a mobile and web push platform in the shape OneSignal offers. Its earlier push product was retired, so if push notifications are the thing you came for, Twilio is the wrong end of the shelf.

So the honest framing is a channel question. If the messages you care about land on a lock screen, OneSignal is in its element. If they land in a text inbox or a phone call, that is Twilio.

The pricing models are where this comparison earns its keep, because they scale on different things.

OneSignal charges by subscriber. Mobile push is free up to a large subscriber count, and paid plans step up from there based on how many subscribers you keep and which extra channels you use. For a team whose main channel is push, the bill stays modest for a long time, since the expensive channels are the ones you add rather than the core one.

Twilio charges by usage, and the headline rate is only the start. A US SMS segment runs around $0.0079 to $0.0083, and carrier pass-through fees add roughly $0.003 to $0.005 on top, which puts the real cost near $0.012 to $0.013 per message. On top of the per-message rate you rent a number at about $1.15 a month, and you register under A2P 10DLC before a single message sends, which carries brand and campaign fees. None of that is Twilio padding the bill. It is what carrier-grade SMS costs in the US, and every provider passes it through. The takeaway for budgeting is that Twilio's cost grows with every message you send, while OneSignal's grows with how many people you can reach.

Push is quick to stand up. You add an SDK, collect subscribers, and start sending, and OneSignal or a tool like Pushfire has you live the same day.

SMS through Twilio carries more friction before you can send anything. US A2P 10DLC registration means registering a brand and a campaign, and approval takes one to three weeks in practice. A rejected campaign costs you the fee again on resubmission, and messages over 160 characters bill as multiple segments. This is worth doing when SMS is central to your product. It is a lot of overhead to take on if you mostly wanted to nudge users back into an app.

OneSignal fits teams whose engagement runs on push and in-app, with email and the occasional SMS as support. Product and lifecycle marketers land here because the subscriber-based pricing rewards a large reachable audience and the console is built for campaigns and segments.

Twilio fits teams where SMS, voice, or WhatsApp is the product or close to it: appointment reminders at volume, two-factor codes, delivery notifications, call flows, and global reach with compliance handled. If you send hundreds of thousands of messages a month, or you need voice and WhatsApp in one place, Twilio's breadth is the reason to pay for it.

Plenty of teams reach for one of these two when what they want is push, plus the ability to drop in an email or a text now and then. That is the space Pushfire is built for. It sends push across iOS, Android, and web through FCM, runs the messages as visual workflows with delays and branching, and adds email and SMS through connectors on the paid tier. It is free up to 5,000 subscribers and $29 a month up to 50,000.

Pushfire does not replace Twilio's telecom side. If SMS or voice at scale is your core channel, or you need global carrier compliance, Twilio is the right tool and worth its overhead. When push is the point and the other channels are occasional, a push-first tool skips the 10DLC process and the per-message math. If you are also weighing OneSignal itself, our OneSignal alternatives guide lays out the wider field.

Name your primary channel first. If it is push, the decision is between OneSignal and a push-first tool like Pushfire, and the subscriber-based pricing on both keeps costs low while you grow. If it is SMS, voice, or WhatsApp at scale, Twilio is the infrastructure built for that, overhead included. If push carries the load and SMS is a once-in-a-while thing, a push-first tool with an SMS connector covers you without a telecom project attached. For the broader question of running one channel well versus spreading across many, see our guide on omnichannel versus push-first.

What is the difference between OneSignal and Twilio?

OneSignal is a push-first customer engagement platform, built around push and in-app messages with email and SMS as add-on channels, and priced by subscriber. Twilio is messaging and voice infrastructure, built around SMS, voice, WhatsApp, and RCS, and priced per message and per minute. They overlap on SMS and email, and they diverge everywhere else.

Is OneSignal cheaper than Twilio?

For push, OneSignal is far cheaper, since mobile push is free up to a large subscriber count and the model scales on audience size. For SMS, the comparison is about usage: Twilio charges per message plus carrier and registration fees, and OneSignal resells SMS with its own per-message pricing. Which is cheaper depends on whether your volume lives in push or in text.

Does Twilio do push notifications?

Twilio centers on SMS, voice, WhatsApp, RCS, and email through SendGrid. It does not offer a dedicated mobile and web push platform the way OneSignal does, since its earlier push product was retired. For push notifications specifically, OneSignal or a push-first tool like Pushfire is the closer fit.

Can I use OneSignal and Twilio together?

Yes, and some teams do. A common setup runs push and in-app through a push-first platform and uses Twilio for SMS, voice, or WhatsApp where carrier reach matters. You get purpose-built tools on each channel, at the cost of running two systems and two bills.

What is a good option for a push-first team?

If push is your main channel and you want workflows without telecom overhead, Pushfire covers push across iOS, Android, and web through FCM, with email and SMS available through connectors on its paid tier. It starts free up to 5,000 subscribers, so you can launch push before taking on anything heavier.

Pushfire runs your push on FCM with visual workflows and a Flutter SDK, free up to 5,000 subscribers. Start at pushfire.app.