Firebase Auth / Identity Platform alternatives, ranked by what you’d actually pay
Answer: As of 2026-10-31: at 10k users Firebase Auth / Identity Platform Pay as you go costs $0/mo and 0 of 9 priceable alternatives are cheaper; at 50k users Firebase Auth / Identity Platform Pay as you go costs $0/mo and 0 of 8 priceable alternatives are cheaper; at 100k users Firebase Auth / Identity Platform Pay as you go costs $275/mo and 3 of 7 priceable alternatives are cheaper (cheapest: WorkOS AuthKit at $0/mo, $3,300/yr less).
| Vendor (cheapest verified plan) | 10k users | 50k users | 100k users | 50k + 5 SSO | Head to head |
|---|---|---|---|---|---|
| Firebase Auth / Identity Platform (current) | $0 Pay as you go | $0 Pay as you go | $275 Pay as you go | $14.25 Pay as you go | |
| Clerk | $0 Hobby | $0 Hobby | $1,025 Pro | $325 Pro | Firebase Auth / Identity Platform vs Clerk |
| WorkOS | $0 AuthKit | $0 AuthKit | $0 AuthKit | $625 AuthKit | Firebase Auth / Identity Platform vs WorkOS |
| Logto | $0 Free | $0 Free | $24* Pro | $264* Pro | Firebase Auth / Identity Platform vs Logto |
| Supabase Auth | $0 Free (platform) | $0 Free (platform) | $25 Pro (platform) | $39.25 Pro (platform) | Firebase Auth / Identity Platform vs Supabase Auth |
| Amazon Cognito | $0 Lite | $220 Lite | $495.00 Lite | $234.25 Lite | Firebase Auth / Identity Platform vs Amazon Cognito |
| Kinde | $0 Free | $716.25 Pro | $1533.85 Plus | $718.85 Plus | Firebase Auth / Identity Platform vs Kinde |
| Descope | $249 Pro | $2,049 Growth | $4,549 Growth | $2,049 Growth | Firebase Auth / Identity Platform vs Descope |
| Auth0 | $0 Free | $3,500 Essentials (B2C) | — | — | Firebase Auth / Identity Platform vs Auth0 |
| Stytch | $0 Pay as you go (B2B) | — | — | — | Firebase Auth / Identity Platform vs Stytch |
Monthly USD list prices, cheapest verified plan per vendor for each scenario, sorted by 50k-user cost. “—” = no fixed published price for that volume (custom / contact sales, or overage not printed). Billing units differ: Clerk counts retained users (MRU), most others MAU. “50k + 5 SSO”: SSO users: Amazon Cognito, Supabase Auth and Firebase Auth / Identity Platform bill SAML/OIDC per SSO user, not per connection (first 50 free, then $0.015 per SSO user a month). Their SSO results here assume 200 SSO users per connection (5 connections = 1,000 SSO users). See how 1,000 or 2,000 per connection changes the result or set your own. * Logto Pro bills access tokens, not MAU (50k tokens included, then $0.08 per 100) — the figure is base fee only; token overage depends on your usage. How we calculate this.
Why teams leave Firebase Auth / Identity Platform
No cost up to 50k MAU (email, phone, anonymous, social), then $0.0055/MAU to 100k, $0.0046 to 1M, $0.0032 to 10M, $0.0025 above. SAML/OIDC: 50 MAU free then $0.015/MAU. SMS (phone sign-in and MFA) billed per message by region (US $0.01); first 10 SMS a day not billed. Sources: cloud.google.com/identity-platform/pricing and firebase.google.com/pricing.
Source: cloud.google.com/identity-platform/pricing · 2026-10-31
Check before you switch
Unit (MAU), SSO per-connection fees, and MFA availability change the ranking more than the headline price. Run your exact numbers in the calculator and read MAU vs MRU.
Or skip the vendor: self-host Better Auth / Auth.js
$0 per user, but you pay in database, email, SMS and engineer hours. See what self-hosting costs instead of Firebase Auth / Identity Platform, with the break-even math at 10k/50k/100k users.
Hear when Firebase Auth / Identity Platform or its alternatives change prices
Weekly: every auth price change we confirmed, SSO fee moves, and the cheapest verified plan for 10k and 50k users. Free; unsubscribe in one click. Sent via Kit · Privacy.