APIbenchmarks

Category report · 7 providers evaluated

Best Push Notification APIs

Push notification APIs split into three camps: raw transport layers (Firebase Cloud Messaging, Amazon SNS, Expo) that deliver to APNs/FCM for free or near-free but leave orchestration to you; engagement/marketing platforms (OneSignal, Airship) built around audiences, segmentation and campaigns; and modern notification-infrastructure APIs (Knock, Courier) that treat push as one channel inside a workflow engine with in-app inboxes and preferences. Compare on documentation/DX, reliability and scale, breadth of official SDKs, and how fast a developer or AI agent can self-serve a working key, transport layers win on free/scale, infra APIs win on DX, and enterprise marketing suites trade self-serve access for depth.

OneSignal logo
Highest rated
OneSignal

Self-serve push + omnichannel engagement

86.4
ABI
A
VerdictWhat is the best push notification API?The short answer, plus which provider wins on each axis.Read the verdict →
OneSignal logoOneSignal
  • Best overall86.4
  • Best access92
  • Best with free tier
Knock logoKnock
  • Best docs & dx90
Amazon SNS logoAmazon SNS
  • Best reliability95
  • Best ecosystem90
Compare providers

What is the best Push Notification API?

Click a column to sort · best value per column highlighted
ProviderFree
1OneSignal logoOneSignalOneSignal8485869286.4AYes
2Firebase Cloud Messaging logoFirebase Cloud MessagingGoogle8292888085.6AYes
3Amazon SNS logoAmazon SNSAWS7895907284.1BYes
4Knock logoKnockKnock9080768883.6BYes
5Courier logoCourierCourier8578808882.6BYes
6Expo Push logoExpo PushExpo8078709079.0BYes
7Airship logoAirshipAirship7488723869.8CNo

Table 1. Best Push Notification APIs ranked by the APIbenchmarks Index. Specification columns are vendor-stated; ABI is computed per the published methodology.

Composite scores

OneSignal logo
OneSignal
86.4
Firebase Cloud Messaging logo
Firebase Cloud Messaging
85.6
Amazon SNS logo
Amazon SNS
84.1
Knock logo
Knock
83.6
Courier logo
Courier
82.6
Expo Push logo
Expo Push
79.0
Airship logo
Airship
69.8
Scale 0–100. Highest in category: 86.4.

Figure 1. APIbenchmarks Index for Push Notification APIs, bar length proportional to composite score; colour encodes letter grade.

Explore the scores

Documentation & DX

Weight 30% · higher is better

Clarity of docs, examples, SDK references, and time to first call.

Reliability

Weight 25% · higher is better

Published uptime commitments and operational track record.

Ecosystem & SDKs

Weight 25% · higher is better

Breadth of official SDKs, integrations, and language coverage.

Accessibility

Weight 20% · higher is better

Free tier, pricing transparency, and onboarding friction.

Provider scorecards

OneSignal logo
1. OneSignalAABI 86.4 · Excellent

The most popular self-serve engagement platform, with an unusually generous unlimited-mobile-push free tier.

Documentation & DX
84
Reliability
85
Ecosystem & SDKs
86
Accessibility
92
Firebase Cloud Messaging logo
2. Firebase Cloud MessagingAABI 85.6 · Excellent

The free, default transport layer almost every other push platform delivers through for Android and web.

Documentation & DX
82
Reliability
92
Ecosystem & SDKs
88
Accessibility
80
Amazon SNS logo
3. Amazon SNSBABI 84.1 · Strong

Pub/sub messaging primitive with mobile push at hyperscale and effectively free volume, but no engagement layer.

Documentation & DX
78
Reliability
95
Ecosystem & SDKs
90
Accessibility
72
Knock logo
4. KnockBABI 83.6 · Strong

Developer-first notification infrastructure with a polished workflow engine, React in-app inbox, and top-tier docs.

Documentation & DX
90
Reliability
80
Ecosystem & SDKs
76
Accessibility
88
Courier logo
5. CourierBABI 82.6 · Strong

Multi-channel notification API routing across 50+ providers, with strong AI-tooling (MCP server) and client inbox SDKs.

Documentation & DX
85
Reliability
78
Ecosystem & SDKs
80
Accessibility
88
Expo Push logo
6. Expo PushBABI 79.0 · Strong

Free unified push API beloved by React Native teams, abstracting APNs and FCM behind one endpoint.

Documentation & DX
80
Reliability
78
Ecosystem & SDKs
70
Accessibility
90
Airship logo
7. AirshipCABI 69.8 · Solid

Enterprise mobile-engagement incumbent with deep orchestration and SLAs, but sales-gated with no public pricing or self-serve key.

Documentation & DX
74
Reliability
88
Ecosystem & SDKs
72
Accessibility
38

How this category is scored

Each provider is evaluated against the same four criteria and scored from 0 to 100. Every figure links to a primary source. Latency and observed-uptime probes are reserved for a future phase. Corrections: corrections@apibenchmarks.com Every provider in Push Notification APIs is scored on the same four criteria: documentation & dx (30%), reliability (25%), ecosystem & sdks (25%), accessibility (20%). Price is reported separately because price units are not comparable. Full methodology →

Best Push Notification APIs ranked by the APIbenchmarks Index: OneSignal 86.4, Firebase Cloud Messaging 85.6, Amazon SNS 84.1, Knock 83.6, Courier 82.6, Expo Push 79.0, Airship 69.8.
Best Push Notification APIs ranked by the APIbenchmarks Index: OneSignal 86.4, Firebase Cloud Messaging 85.6, Amazon SNS 84.1, Knock 83.6, Courier 82.6, Expo Push 79.0, Airship 69.8.

Frequently asked questions

What is the best Push Notification API?
By the APIbenchmarks Index, OneSignal rates highest (ABI 86.4, grade A). Self-serve push + omnichannel engagement The ABI weights documentation, reliability, ecosystem, and accessibility; price is reported separately, so the right pick still depends on your budget and workload.
Which push notification APIs have a free tier?
OneSignal, Firebase Cloud Messaging, Amazon SNS, Knock, Courier, Expo Push offer a free tier or trial credits.
How is the APIbenchmarks Index calculated?
The ABI is a weighted composite of four dimensions scored on absolute reference scales: documentation & DX (30%), reliability (25%), ecosystem & SDKs (25%), and accessibility (20%). Price is excluded from the composite because price units are not comparable across categories. The full formula is on the methodology page.

Popular comparisons

OneSignal vs Firebase Cloud MessagingOneSignal vs Amazon SNSOneSignal vs KnockFirebase Cloud Messaging vs Amazon SNSFirebase Cloud Messaging vs KnockAmazon SNS vs Knock

References

61 primary sources · show all
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