Firebase Authentication

Google-backed auth with generous free tier for mobile and web

Firebase Authentication vs Split.io: Full Comparison (2026)

Pricing, features, scores, and a clear verdict on which one is right for you.

The bottom line

Firebase Authentication positions itself as "google-backed auth with generous free tier for mobile and web" while Split.io goes after "feature flags plus experimentation" — so the right pick depends on which problem you're actually solving. Both use freemium pricing, but Firebase Authentication charges per mau while Split.io charges per seat — a meaningful difference for larger teams.

At a glance

	Firebase Authentication	Split.io
Our score	76/100	81/100
Starting price	Free	Free
Free tier	Yes	Yes
Best for	Google-backed auth with generous free tier for mobile and web	Feature flags plus experimentation

Pricing comparison

Firebase Authentication

Free tier available

Spark (Free)Free

Blaze (Pay-as-you-go)$null/mo

Pricing verified 2026-04-16

Split.io

Free tier available

DeveloperFree

Team$33/mo

Pricing verified 2026-04-16

Calculate your cost

How many developers?10

1500

Firebase AuthenticationUnknown

Contact sales

Split.ioCustom

Contact sales

Contact sales — exceeds available plans

Try Firebase Authentication free →Try Split.io free →

Feature comparison

core

Feature	Firebase Authentication	Split.io
Email/password	Yes	No
Google OAuth	Yes	No
Apple OAuth	Yes	No
Phone SMS	Yes	No
Anonymous auth	Yes	No
Feature flags	No	Yes
Targeting rules	No	Yes
Percentage rollouts	No	Yes
Kill switches	No	Yes
Multi-environment	No	Yes

advanced

Feature	Firebase Authentication	Split.io
Multi-tenancy	Blaze	No
SAML SSO	Blaze ($0.015/MAU)	No
Custom claims	Yes	No
App Check	Yes	No
Blocking functions	Yes	No
Statistical significance	No	Yes
Impact analysis	No	Yes
Metric monitoring	No	Yes
Attribution	No	Yes
Guardrail metrics	No	Yes

integrations

Feature	Firebase Authentication	Split.io
Firebase (all products)	Yes	No
Google Cloud	Yes	No
Flutter	Yes	No
Android/iOS SDKs	Yes	No
Web SDK	Yes	No
Segment	No	Yes
Amplitude	No	Yes
Mixpanel	No	Yes
Jira	No	Yes
Slack	No	Yes

Ratings breakdown

Firebase Authentication

Ease of use

8/10

Value for money

9/10

Features

7/10

Support

6/10

Split.io

Ease of use

7/10

Value for money

8/10

Features

9/10

Support

7/10

What the data tells us

Key capabilities you'd miss

Choosing Firebase Authentication means going without Feature flags, Targeting rules, Percentage rollouts (which Split.io offers). Choosing Split.io means losing Email/password, Google OAuth, Apple OAuth. These are the features that typically drive the final decision — check whether your workflow depends on any of them before committing.

What company size tells you

Split.io (201-500 employees) has the engineering bench to ship features across many fronts but may iterate slower on individual requests. Firebase Authentication (100,000+ employees) typically ships faster on its core product but may lag on peripheral features. Consider which matters more for your roadmap.

Choose Firebase Authentication if...

You want a free tier to get started
You value an intuitive, easy-to-use interface
Getting strong value for money is a priority

Try Firebase Authentication free →

Choose Split.io if...

You want a free tier to get started
You value powerful features over simplicity
Getting strong value for money is a priority

Try Split.io free →

Frequently asked questions

Is Firebase Authentication or Split.io better?

Split.io scores 81/100 compared to Firebase Authentication's 76/100 on VendorVS. However, the best choice depends on your needs — Firebase Authentication excels at ease of use (8/10) while Split.io scores 7/10.

How much does Firebase Authentication cost compared to Split.io?

Firebase Authentication starts at free (free tier available). Split.io starts at free (free tier available). Firebase Authentication is the more affordable option.

Does Firebase Authentication or Split.io have a free plan?

Yes, both Firebase Authentication and Split.io offer free tiers, so you can try each before committing to a paid plan.

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