7 Best Notification Infrastructure APIs in 2026 (Compared)
Every SaaS product ends up building the same notification system twice. The first version is a send_email() call inside a controller. The second one arrives six months later, when users ask for an in-app inbox, a "daily digest instead of 40 emails" setting, and a way to mute Slack alerts without muting everything. If you're: adding an in-app inbox to your product, replacing a pile of email, SMS…
Every SaaS product ends up building the same notification system twice. This comparison focuses on the three top APIs: Knock, Novu and Courier. Knock is recommended for a polished developer experience with digests on the free plan. Novu offers an open-source MIT core and the lowest bill. Courier is ideal for mobile-first apps needing inbox SDKs for iOS, Android and Flutter.
The comparison is based on official docs and pricing pages checked on October 31, 2026. There are no latency or deliverability numbers here, only what each vendor publicly documents. This table shows monthly costs for 50,000 events across two channels: Knock at $500, Novu at $54 and Courier starting at $500 (business plan). Pricing depends on how each vendor counts channel messages, which can significantly impact cost.
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