The 6 Best OneSignal Alternatives in 2026

Knock is the polished commercial take on the same problem Novu solves in the open. Its strengths are the workflow editor non-engineers can actually use, genuinely good batching and digest logic, and a preference centre that handles the per-user, per-channel matrix properly. The jump from a free developer tier to $250 is steep and is the main reason teams weigh it against self-hosting.

• Best-in-class batching and digests
• Preference centre handles the hard cases
• Workflow editor non-engineers can use

Novu is the open-source answer to writing notification plumbing yourself. You define a workflow once — with steps, digests, delays and per-user preferences — and it fans out to whichever providers you have configured, including a React inbox component you can drop into your product. The whole thing can be self-hosted, which makes it the rare row in this category where building and buying are genuinely close.

• Fully open source and self-hostable
• Drop-in React inbox component
• Bring your own delivery providers

Ably is Pusher's more rigorous competitor: the pitch is not just realtime but guaranteed realtime, with message ordering, exactly-once delivery, connection state recovery after a drop, and a 99.999% uptime SLA. Standard starts at $29 plus usage at $2.50 per million messages. For a chat product or a collaborative editor where a dropped message is a bug report, the guarantees are the reason to pay.

• Ordering and delivery guarantees
• Connection state recovery after drops
• Global edge network

Courier's distinguishing idea is the template studio: designers edit notification content visually, across every channel, without a deploy. Routing rules decide which channel a given user gets and in what order, with automatic fallback. Pricing is the simplest in the category and also the least bounded — $0.005 per send with no flat tier above the free 10,000, so cost tracks volume exactly.

• Visual template studio across all channels
• Automatic channel fallback routing
• Pay exactly for what you send

MagicBell leads with the component rather than the pipeline: a bell icon and notification centre you drop into an app and have working the same afternoon, with read state, preferences and real-time updates handled. The API behind it fans out to email, push and Slack when a user does not see the in-app message. Pricing jumps hard from free to $249, which positions it at funded teams rather than side projects.

• Prebuilt inbox UI for four platforms
• Fastest path to a working notification centre
• Real-time read state out of the box

Pusher Channels is the long-standing default for 'make this screen update without a refresh'. You publish to a channel, connected clients receive it, and Pusher operates the socket infrastructure. It is realtime transport rather than notification orchestration: no templates, no per-user preferences, no email fallback — but for live dashboards, collaborative cursors and in-app toasts it is a few lines of code.

• Working realtime in minutes
• Predictable flat tiers
• Mature SDKs for every platform