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OneSignal alternatives: 2 apps ranked by verified data

Facts checked Nov 1, 2026AppBreakup editorialHow we rank

Common reasons people leave OneSignal: usage-based pricing across channels can be hard to predict, and segments, data tags and Journeys are tightly limited on lower plans. We ranked 2 alternatives by how directly each one replaces OneSignal, then by reviews, real visits and how recently each app's facts were checked against its own website. Firebase currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Firebase logoFirebaseFree plan + paidNoWeb, iOS, Android8 of 871.8
2Customer.io logoCustomer.ioPaidNoWeb3 of 350.0
  1. Firebase logo

    1. FirebaseTop pick

    Best for: Mobile and web teams who want realtime sync, auth and push messaging from one vendor

    Free plan + paidWeb, iOS, Android

    71.8

    score / 100

    Why switch from OneSignal

    Firebase Cloud Messaging sends push for free if you only need delivery, not campaigns.

    Pros

    • Mature SDKs for Android, iOS, Flutter and web
    • Realtime sync and offline support built into the client libraries
    • Wide set of mobile services such as crash reporting and push messaging

    Cons

    • Ties your app closely to Google Cloud
    • NoSQL query limits often force data duplication
    • Pay-as-you-go bills can spike with heavy reads
    Visit Firebase Details and reviews
    How this score is calculated
    Editorial fit ×0.360
    Reviews ×0.363
    Clicks (90 days) ×0.15100
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Firebase a good OneSignal alternative?

    Verified facts

    8 of 8 verified
    Free plan
    Yes, Spark plan
    Checked Nov 1, 2026firebase.google.com(opens source in a new tab)
    Paid plan
    Blaze, pay as you go
    Checked Oct 29, 2026firebase.google.com(opens source in a new tab)
    Database
    Firestore, a NoSQL document database
    Checked Oct 29, 2026firebase.google.com(opens source in a new tab)
    SQL option
    PostgreSQL via Firebase SQL Connect
    Checked Oct 29, 2026firebase.google.com(opens source in a new tab)
    Blaze plan
    Pay as you go, with Spark free usage included
    Checked Nov 1, 2026firebase.google.com(opens source in a new tab)
    Cloud Functions
    Free up to 2M invocations/month, then $0.40 per million
    Checked Nov 1, 2026firebase.google.com(opens source in a new tab)
    Cloud Storage
    Free up to 5 GB, then $0.026 per GB
    Checked Nov 1, 2026firebase.google.com(opens source in a new tab)
    Free credit
    $300 for eligible Blaze users
    Checked Nov 1, 2026firebase.google.com(opens source in a new tab)
  2. Customer.io logo

    2. Customer.io

    Best for: SaaS and app companies that trigger messages from product events

    PaidWeb

    50.0

    score / 100

    Why switch from OneSignal

    Event-driven messaging with strong email workflows plus push and in-app.

    Pros

    • Event-driven journeys across email, push, SMS and in-app
    • Flexible data model with real-time segments
    • Handles marketing and transactional messages

    Cons

    • Needs developer work to send events
    • Expensive step up to Premium
    • Overkill for simple newsletters
    Visit Customer.io Details and reviews
    How this score is calculated
    Editorial fit ×0.338
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Customer.io a good OneSignal alternative?

    Verified facts

    3 of 3 verified
    Essentials price
    From $100/month
    Checked Oct 29, 2026customer.io(opens source in a new tab)
    Premium price
    From $1,000/month billed yearly
    Checked Oct 29, 2026customer.io(opens source in a new tab)
    Startup program
    12 months free for early-stage companies
    Checked Oct 29, 2026customer.io(opens source in a new tab)

The best OneSignal alternative for…

The highest-ranked app in this list for each need.

Firebase logo

Best OneSignal alternative for most people

Firebase

Firebase Cloud Messaging sends push for free if you only need delivery, not campaigns.

Firebase logo

Best OneSignal alternative for a free plan you can upgrade

Firebase

Firebase Cloud Messaging sends push for free if you only need delivery, not campaigns.

Firebase logo

Best OneSignal alternative for iPhone and Android

Firebase

Firebase Cloud Messaging sends push for free if you only need delivery, not campaigns.

Customer.io logo

Best OneSignal alternative for working in the browser

Customer.io

Event-driven messaging with strong email workflows plus push and in-app.

OneSignal alternatives: common questions

What is the best alternative to OneSignal?

Firebase ranks first right now. Firebase Cloud Messaging sends push for free if you only need delivery, not campaigns.

Is there a free alternative to OneSignal?

Yes. Firebase (free plan + paid) has a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to OneSignal?

None of the 2 alternatives in this list is open source.

Why do people switch from OneSignal?

The complaints we hear most: usage-based pricing across channels can be hard to predict; segments, data tags and Journeys are tightly limited on lower plans; SMS and advanced plans require talking to sales.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces OneSignal, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.