[{"data":1,"prerenderedAt":646},["ShallowReactive",2],{"blog-comparisons/firebase-vs-supabase-auth":3},{"id":4,"title":5,"body":6,"category":625,"date":626,"dateModified":627,"description":628,"draft":629,"extension":630,"faq":631,"featured":629,"headerVariant":632,"image":631,"keywords":631,"meta":633,"navigation":634,"ogDescription":635,"ogTitle":631,"path":636,"readTime":637,"schemaOrg":638,"schemaType":639,"seo":640,"sitemap":641,"stem":642,"tags":643,"twitterCard":644,"__hash__":645},"blog/blog/comparisons/firebase-vs-supabase-auth.md","Firebase Auth vs Supabase Auth Security: Complete Comparison",{"type":7,"value":8,"toc":601},"minimark",[9,16,21,124,128,133,141,165,169,172,193,203,207,264,267,271,274,294,303,307,362,365,369,373,390,394,411,419,423,485,488,492,502,511,542,546,549,570,589],[10,11,12],"tldr",{},[13,14,15],"p",{},"Both Firebase Auth and Supabase Auth are secure, production-ready authentication systems. Firebase has more mature mobile SDKs and phone authentication. Supabase Auth integrates seamlessly with PostgreSQL RLS through the auth.uid() function. Both support MFA, social login, and email/password. Choose based on your database preference and SDK needs.",[17,18,20],"h2",{"id":19},"feature-comparison","Feature Comparison",[22,23,24,40],"table",{},[25,26,27],"thead",{},[28,29,30,34,37],"tr",{},[31,32,33],"th",{},"Feature",[31,35,36],{},"Firebase Auth",[31,38,39],{},"Supabase Auth",[41,42,43,54,64,74,84,95,104,114],"tbody",{},[28,44,45,49,52],{},[46,47,48],"td",{},"Email/Password",[46,50,51],{},"Yes",[46,53,51],{},[28,55,56,59,62],{},[46,57,58],{},"Social Login (Google, GitHub)",[46,60,61],{},"Yes (many providers)",[46,63,61],{},[28,65,66,69,72],{},[46,67,68],{},"Phone/SMS Auth",[46,70,71],{},"Yes (mature)",[46,73,51],{},[28,75,76,79,82],{},[46,77,78],{},"Magic Links",[46,80,81],{},"Yes (email link)",[46,83,51],{},[28,85,86,89,92],{},[46,87,88],{},"Multi-Factor Auth",[46,90,91],{},"Yes (SMS, TOTP)",[46,93,94],{},"Yes (TOTP)",[28,96,97,100,102],{},[46,98,99],{},"Anonymous Auth",[46,101,51],{},[46,103,51],{},[28,105,106,109,111],{},[46,107,108],{},"Custom Claims",[46,110,51],{},[46,112,113],{},"Yes (via user metadata)",[28,115,116,119,122],{},[46,117,118],{},"Token Type",[46,120,121],{},"JWT",[46,123,121],{},[17,125,127],{"id":126},"database-integration","Database Integration",[129,130,132],"h3",{"id":131},"firebase-auth-firestore","Firebase Auth + Firestore",[13,134,135,136,140],{},"Firebase Auth integrates with Firestore security rules through the ",[137,138,139],"code",{},"request.auth"," object:",[142,143,144,152,159,162],"ul",{},[145,146,147,148,151],"li",{},"Access ",[137,149,150],{},"request.auth.uid"," to get the authenticated user's ID",[145,153,154,155,158],{},"Check ",[137,156,157],{},"request.auth.token"," for custom claims",[145,160,161],{},"Rules are evaluated on every read/write operation",[145,163,164],{},"Works seamlessly with Firebase's ecosystem",[129,166,168],{"id":167},"supabase-auth-postgresql","Supabase Auth + PostgreSQL",[13,170,171],{},"Supabase Auth integrates with PostgreSQL RLS through SQL functions:",[142,173,174,181,187,190],{},[145,175,176,177,180],{},"Use ",[137,178,179],{},"auth.uid()"," in RLS policies to get the current user",[145,182,147,183,186],{},[137,184,185],{},"auth.jwt()"," for the full JWT payload",[145,188,189],{},"Policies are PostgreSQL statements, familiar to SQL developers",[145,191,192],{},"Authentication state is available in all database queries",[194,195,196],"info-box",{},[13,197,198,202],{},[199,200,201],"strong",{},"Key Difference:"," Supabase Auth is tightly coupled with PostgreSQL. The auth schema stores users directly in your database. Firebase Auth is a separate service that Firestore references via rules.",[17,204,206],{"id":205},"password-security","Password Security",[22,208,209,220],{},[25,210,211],{},[28,212,213,216,218],{},[31,214,215],{},"Security Feature",[31,217,36],{},[31,219,39],{},[41,221,222,233,243,254],{},[28,223,224,227,230],{},[46,225,226],{},"Password Hashing",[46,228,229],{},"bcrypt (handled by Google)",[46,231,232],{},"bcrypt",[28,234,235,238,241],{},[46,236,237],{},"Password Strength",[46,239,240],{},"Configurable requirements",[46,242,240],{},[28,244,245,248,251],{},[46,246,247],{},"Breach Detection",[46,249,250],{},"Yes (Identity Platform)",[46,252,253],{},"No (manual integration)",[28,255,256,259,262],{},[46,257,258],{},"Password Reset",[46,260,261],{},"Email with secure link",[46,263,261],{},[13,265,266],{},"Both platforms use bcrypt for password hashing and support customizable password requirements. Firebase's Identity Platform (paid upgrade) includes password breach detection.",[17,268,270],{"id":269},"token-security","Token Security",[13,272,273],{},"Both platforms use JWT tokens with similar security characteristics:",[142,275,276,282,288],{},[145,277,278,281],{},[199,279,280],{},"Short-lived access tokens:"," Both use tokens that expire (typically 1 hour)",[145,283,284,287],{},[199,285,286],{},"Refresh tokens:"," Long-lived tokens for obtaining new access tokens",[145,289,290,293],{},[199,291,292],{},"Secure storage:"," SDKs handle secure token storage appropriately per platform",[295,296,297],"warning-box",{},[13,298,299,302],{},[199,300,301],{},"Security Note:"," Never store tokens in localStorage for sensitive applications. Both platforms' SDKs use more secure storage mechanisms when available.",[17,304,306],{"id":305},"multi-factor-authentication","Multi-Factor Authentication",[22,308,309,320],{},[25,310,311],{},[28,312,313,316,318],{},[31,314,315],{},"MFA Feature",[31,317,36],{},[31,319,39],{},[41,321,322,332,341,351],{},[28,323,324,327,329],{},[46,325,326],{},"SMS OTP",[46,328,51],{},[46,330,331],{},"No (phone auth is separate)",[28,333,334,337,339],{},[46,335,336],{},"TOTP Apps",[46,338,51],{},[46,340,51],{},[28,342,343,346,349],{},[46,344,345],{},"Hardware Keys",[46,347,348],{},"No",[46,350,348],{},[28,352,353,356,359],{},[46,354,355],{},"Enforcement",[46,357,358],{},"Per-user or required",[46,360,361],{},"Per-user optional",[13,363,364],{},"Firebase has more mature MFA support with SMS as a second factor. Supabase focuses on TOTP (authenticator apps) for MFA.",[17,366,368],{"id":367},"admin-capabilities","Admin Capabilities",[129,370,372],{"id":371},"firebase-admin-sdk","Firebase Admin SDK",[142,374,375,378,381,384,387],{},[145,376,377],{},"Create and manage users programmatically",[145,379,380],{},"Set custom claims for role-based access",[145,382,383],{},"Revoke refresh tokens",[145,385,386],{},"Import users from other systems",[145,388,389],{},"Generate sign-in links",[129,391,393],{"id":392},"supabase-service-role","Supabase Service Role",[142,395,396,399,402,405,408],{},[145,397,398],{},"Bypass RLS for admin operations",[145,400,401],{},"Direct access to auth schema",[145,403,404],{},"Manage users via SQL or API",[145,406,407],{},"Set user metadata and app metadata",[145,409,410],{},"Invite users via email",[295,412,413],{},[13,414,415,418],{},[199,416,417],{},"Critical:"," Neither the Firebase Admin SDK credentials nor the Supabase service role key should ever be exposed to the frontend. Both give unrestricted access to user data.",[17,420,422],{"id":421},"sdk-and-platform-support","SDK and Platform Support",[22,424,425,436],{},[25,426,427],{},[28,428,429,432,434],{},[31,430,431],{},"Platform",[31,433,36],{},[31,435,39],{},[41,437,438,448,458,467,476],{},[28,439,440,443,446],{},[46,441,442],{},"Web (JavaScript)",[46,444,445],{},"Excellent",[46,447,445],{},[28,449,450,453,455],{},[46,451,452],{},"React Native",[46,454,445],{},[46,456,457],{},"Good",[28,459,460,463,465],{},[46,461,462],{},"iOS Native",[46,464,445],{},[46,466,457],{},[28,468,469,472,474],{},[46,470,471],{},"Android Native",[46,473,445],{},[46,475,457],{},[28,477,478,481,483],{},[46,479,480],{},"Flutter",[46,482,445],{},[46,484,457],{},[13,486,487],{},"Firebase has been around longer and has more battle-tested mobile SDKs. Supabase's SDKs are newer but rapidly improving.",[17,489,491],{"id":490},"which-should-you-choose","Which Should You Choose?",[493,494,495,499],"success-box",{},[129,496,498],{"id":497},"choose-firebase-auth-if","Choose Firebase Auth If:",[13,500,501],{},"You're building mobile apps and need mature SDKs, want SMS-based MFA, need phone number authentication as a primary method, or are already using Firebase services.",[194,503,504,508],{},[129,505,507],{"id":506},"choose-supabase-auth-if","Choose Supabase Auth If:",[13,509,510],{},"You want tight PostgreSQL integration with RLS, prefer SQL-based access control, need users stored in your own database, or are building primarily for web with some mobile.",[512,513,514,521,527,536],"faq-section",{},[515,516,518],"faq-item",{"question":517},"Which is more secure?",[13,519,520],{},"Both are equally secure when properly configured. Firebase Auth is backed by Google's security infrastructure. Supabase Auth is open-source and auditable. Security depends more on your implementation than the platform choice.",[515,522,524],{"question":523},"Can I migrate users between platforms?",[13,525,526],{},"Migrating is complex because password hashes aren't directly compatible. You'd need to either: require password resets for all users, or use a gradual migration that re-hashes on next login. Neither platform makes this easy.",[515,528,530],{"question":529},"Can I use Firebase Auth with Supabase database?",[13,531,532,533,535],{},"Technically yes, but you lose the ",[137,534,179],{}," integration with RLS. You'd need to verify Firebase tokens in your backend and manually manage user references. It's not recommended unless you have a specific need.",[515,537,539],{"question":538},"Which has better rate limiting?",[13,540,541],{},"Firebase has more aggressive built-in rate limiting and abuse detection. Supabase provides rate limiting but may require additional configuration for high-security scenarios.",[17,543,545],{"id":544},"further-reading","Further Reading",[13,547,548],{},"Made your choice? Here's how to secure your selected stack.",[142,550,551,558,564],{},[145,552,553],{},[554,555,557],"a",{"href":556},"/blog/checklists/pre-deployment-security-checklist","Pre-deployment security checklist",[145,559,560],{},[554,561,563],{"href":562},"/blog/getting-started/first-scan","Run your first security scan",[145,565,566],{},[554,567,569],{"href":568},"/blog/best-practices/api-design","API security best practices",[571,572,573,579,584],"related-articles",{},[574,575],"related-card",{"description":576,"href":577,"title":578},"Full platform comparison","/blog/comparisons/supabase-vs-firebase","Supabase vs Firebase Security",[574,580],{"description":581,"href":582,"title":583},"Auth library comparison","/blog/comparisons/clerk-vs-nextauth","NextAuth vs Clerk Security",[574,585],{"description":586,"href":587,"title":588},"Complete security setup","/blog/guides/supabase","Supabase Security Guide",[590,591,594,598],"cta-box",{"href":592,"label":593},"/","Start Free Scan",[17,595,597],{"id":596},"check-your-auth-security","Check Your Auth Security",[13,599,600],{},"Scan your project for authentication vulnerabilities.",{"title":602,"searchDepth":603,"depth":603,"links":604},"",2,[605,606,611,612,613,614,618,619,623,624],{"id":19,"depth":603,"text":20},{"id":126,"depth":603,"text":127,"children":607},[608,610],{"id":131,"depth":609,"text":132},3,{"id":167,"depth":609,"text":168},{"id":205,"depth":603,"text":206},{"id":269,"depth":603,"text":270},{"id":305,"depth":603,"text":306},{"id":367,"depth":603,"text":368,"children":615},[616,617],{"id":371,"depth":609,"text":372},{"id":392,"depth":609,"text":393},{"id":421,"depth":603,"text":422},{"id":490,"depth":603,"text":491,"children":620},[621,622],{"id":497,"depth":609,"text":498},{"id":506,"depth":609,"text":507},{"id":544,"depth":603,"text":545},{"id":596,"depth":603,"text":597},"comparisons","2026-02-06","2026-02-23","Compare Firebase Auth and Supabase Auth security features. Learn which authentication platform is more secure for your vibe-coded application.",false,"md",null,"purple",{},true,"Compare authentication security between Firebase and Supabase.","/blog/comparisons/firebase-vs-supabase-auth","9 min read","[object Object]","Article",{"title":5,"description":628},{"loc":636},"blog/comparisons/firebase-vs-supabase-auth",[],"summary_large_image","NNyyzPgPm7b1wy_tZntHlBrwa5OyJEvAQT2A2APenBE",1775843934042]