The OneSignal alternative: one API for every channel, billed on events, not MAU.

• The bill follows monthly active users. Growth adds $0.012 per mobile monthly active user to its $19 platform fee, and the free plan stops mobile push and in-app after 1,000 of them (pricing, billing FAQ). Notifly meters the events you trigger and leaves subscribers unlimited. The numbers are on the OneSignal pricing page.
• One workflow across email, SMS, chat, push and an in-app inbox. Notifly runs all five channels from one workflow engine on every plan, so a single trigger can push, post to the inbox and fall back to email.
• Your own email and SMS providers. Notifly sends through accounts you connect and pay directly, across 70+ provider integrations. OneSignal's docs keep multiple senders, suppression lists and custom sending domains to its own email service (email setup).
• Notifications wired in from code. Workflows are triggered from your backend with an API call, so notifications ship with your code, not from a campaign calendar. If you want campaign tooling and A/B testing instead, OneSignal is the better fit, as the section below says.

Weighing more than OneSignal? The compare hub holds the same sourced comparison against other OneSignal competitors.

As of October 15, 2026, this is what OneSignal's own pricing page and billing FAQ say. Every figure below is quoted from one of the two, and linked where it appears. For the whole bill laid out, with worked monthly totals at 1,000, 10,000 and 100,000 monthly active users, see OneSignal pricing in 2026.

What the free plan includes

• $0 a month, every channel. Unlimited mobile push notifications, in-app messages and Live Activities sessions for organizations with up to 1,000 monthly active users, web push to at most 10,000 subscribers per send, 10,000 email sends a month, and SMS and RCS (pricing).
• The 1,000 MAU limit. From September 1, 2026 for new customers and October 1, 2026 for existing ones, a free organization must stay under 1,000 monthly active users to send mobile push and in-app messages. Over it, you have 24 hours to upgrade before those two stop; web push, email and SMS keep sending. Deleting subscriptions does not lift it at once, because the limit is measured over a trailing 30 days (billing FAQ).
• Who counts. A monthly active user is a mobile subscription that has been active in your app within the last 30 days, whether or not it opted in to push (pricing). The free-plan limit adds up every app in the organization. Its billing definition counts each mobile subscription separately, so one person using your app on two devices in the same billing cycle is 2 MAU (billing FAQ).
• Other limits. 3 active Journeys, 6 audience segments, 6 data tags, up to 30 days of reporting history, 48 hours of audit logs, and the Admin user permission only (pricing).

The paid plans, and how the bill scales

• Growth, from $19 a month, month to month. A fixed platform fee plus usage: $0.012 per mobile monthly active user with in-app messages included, $0.004 per web push subscriber, and 20,000 email sends a month before $1.50 per 1,000. Its limits rise to 5 active Journeys, 10 audience segments, 10 data tags and up to 90 days of reporting history (pricing).
• A worked example. OneSignal's Growth plan cost calculator puts 10,000 mobile monthly active users at $139 a month: the $19 platform fee plus $120 of mobile push (calculator).
• Professional and Enterprise, custom. Annual contracts with volume-based pricing. Professional allows 20 active Journeys and up to a year of reporting history; Enterprise allows unlimited Journeys, up to two years of history and 90 days of audit logs (pricing).
• When OneSignal points you to sales. Its billing FAQ asks organizations with over 50,000 MAU to contact sales for volume-based discounts on an annual plan, and caps self-serve plans at 500,000 emails a month unless OneSignal's support team lifts the limit (billing FAQ).

The same questions for Notifly

Notifly prices the events you trigger and nothing about your audience: subscribers are unlimited on every plan, and no plan charges per user, device or app. These are the plans the pricing page lists:

• Free, $0 forever. 10,000 events per month.
• Pro, $19/month. 50,000 events per month.
• Team, $149/month. 500,000 events per month.
• Enterprise, Custom. 5,000,000 events per month.

So the 10,000 mobile users in OneSignal's example add nothing to a Notifly bill on their own; the plan is set by how many notification events you send them. Push is delivered through your own FCM and APNs credentials, and email and SMS through providers you connect and pay directly.

A per-MAU plan charges you for success you have not monetized yet: a launch, a viral week or a re-engagement campaign moves your monthly active users, and the bill follows whether or not you sent anyone a notification. OneSignal's Growth plan starts at $19 a month and then adds $0.012 per mobile-push monthly active user, according to its pricing page; on Growth, email is metered on top past 20,000 sends a month.

Notifly meters the event you trigger. A workflow that pushes to a phone, drops a message in the in-app inbox and sends a fallback email is one event, and the delivery itself runs on provider accounts you already own, at their rates. Growing an audience does not by itself move you up a plan; sending more notifications does.

Pick OneSignal if the people sending notifications are marketers rather than engineers. Its campaign and marketing tooling and its A/B testing are mature, and Notifly has no equivalent for them — Notifly's workflows are triggered from your code, not scheduled from a campaign calendar.

Pick it, too, if you would rather have one vendor deliver your email and SMS than connect providers of your own — OneSignal runs its own email and SMS services, where Notifly only sends through providers you connect — or if a month of reporting history on the free plan matters to you: OneSignal's free plan keeps up to 30 days, Notifly's keeps 24 hours and Team keeps 90 days.