Notes on auth, OAuth, OIDC, SSO providers, session management, and building authentication that doesn't get in the way.https://loginwith.app/en-ushttps://loginwith.app/blog/fastest-auth-for-saas-2026/https://loginwith.app/blog/fastest-auth-for-saas-2026/Pick the provider that matches your stack. Drop in the SDK. Ship sign-in in under a day. Full walkthrough.Mon, 20 Apr 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/auth-glossary/https://loginwith.app/blog/auth-glossary/Plain-English definitions of OAuth, OIDC, JWT, SAML, SCIM, PKCE, and every other auth acronym you'll hit shipping real software. Linked deep-dive for each term.Fri, 17 Apr 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/saas-auth-checklist/https://loginwith.app/blog/saas-auth-checklist/The pragmatic list of auth controls every production SaaS needs. If you can't tick all 20, you have work to do.Fri, 17 Apr 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/why-not-build-your-own-auth/https://loginwith.app/blog/why-not-build-your-own-auth/You can. You probably shouldn't. The full cost analysis most build-vs-buy posts skip.Mon, 13 Apr 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/auth0-vs-firebase-vs-supabase/https://loginwith.app/blog/auth0-vs-firebase-vs-supabase/The honest comparison — and why most dev-first SaaS teams should consider a fourth option.Mon, 06 Apr 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/sso-for-startups-when-needed/https://loginwith.app/blog/sso-for-startups-when-needed/Ship SSO when a deal requires it, not before. The signs that it's time — and how to architect so it's two weeks, not two quarters.Mon, 30 Mar 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/simplest-multi-tenant-architecture/https://loginwith.app/blog/simplest-multi-tenant-architecture/One auth layer, tenant_id on every row, Postgres row-level security if you trust your ORM. Scales to most B2B SaaS.Mon, 23 Mar 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/passwordless-worth-it/https://loginwith.app/blog/passwordless-worth-it/Worth it for B2C. Overkill for internal tools. Nuanced for SaaS. The honest take on when to adopt.Mon, 16 Mar 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/auth-kills-saas-conversion/https://loginwith.app/blog/auth-kills-saas-conversion/Every step in your signup flow halves your conversion. Auth usually adds two or three unnecessary steps. Fixes that pay for themselves.Mon, 09 Mar 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/scaling-auth-100-10k/https://loginwith.app/blog/scaling-auth-100-10k/Three specific things will bend. All are cheap to fix ahead of time. Don't wait for the incident.Mon, 02 Mar 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/firebase-auth-limitations/https://loginwith.app/blog/firebase-auth-limitations/Great for day one. Painful by month twelve. Here are the specific walls you'll hit, in order.Mon, 23 Feb 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/cheaper-alternatives-to-auth0/https://loginwith.app/blog/cheaper-alternatives-to-auth0/Auth0 is solid. It's also priced for companies much bigger than yours. Here's what to switch to, and why.Mon, 16 Feb 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/implement-google-login-15/https://loginwith.app/blog/implement-google-login-15/Three steps. Standard OIDC. Any library implements it identically. No excuse for this to eat a sprint.Mon, 09 Feb 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/jwt-vs-sessions-what-matters/https://loginwith.app/blog/jwt-vs-sessions-what-matters/The real question isn't "stateless vs stateful." It's "can I revoke this credential in a hurry?"Mon, 02 Feb 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/hidden-cost-auth/https://loginwith.app/blog/hidden-cost-auth/Most teams budget the initial build. Nobody budgets the next five years. The real math, year by year.Mon, 26 Jan 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/design-roles-permissions-properly/https://loginwith.app/blog/design-roles-permissions-properly/RBAC until it breaks. ABAC when it breaks. Never invent your own policy language. The full rollout path.Mon, 19 Jan 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/mvp-auth-to-production/https://loginwith.app/blog/mvp-auth-to-production/When to stop duct-taping and make it real. The four signals that it's time — and the migration path that doesn't break users.Mon, 12 Jan 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/what-breaks-at-1000-users/https://loginwith.app/blog/what-breaks-at-1000-users/Not much in the product. A lot in auth. The specific things you'll hit in month N.Mon, 05 Jan 2026 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/audit-logs-compliance/https://loginwith.app/blog/audit-logs-compliance/Append-only, timestamped, with subject and object identified. Five specific requirements that most home-grown logs miss.Mon, 29 Dec 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/best-sso-providers-small-saas/https://loginwith.app/blog/best-sso-providers-small-saas/What actually works when Auth0 is overkill and rolling your own is a distraction. The pragmatic path for small B2B SaaS.Mon, 22 Dec 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/five-signs-auth-slows-you-down/https://loginwith.app/blog/five-signs-auth-slows-you-down/Recognize the symptoms before they become a quarter of rework. Each sign has a fix — and a lower-friction alternative.Mon, 15 Dec 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/localhost-to-prod/https://loginwith.app/blog/localhost-to-prod/Three env vars, one redirect URI update, one cookie flag. The leap shouldn't require a rewrite.Mon, 08 Dec 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/nextjs-sso-15-minutes/https://loginwith.app/blog/nextjs-sso-15-minutes/Server components + a signed session cookie. The cleanest pattern, walked through end to end.Mon, 01 Dec 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/svelte-auth-20-lines/https://loginwith.app/blog/svelte-auth-20-lines/One store, one load function, one redirect guard. Svelte makes this shorter than any other framework.Mon, 24 Nov 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/two-tag-sso/https://loginwith.app/blog/two-tag-sso/Load the SDK, link to the provider. Sign users in from a static site without a server or client secret.Mon, 17 Nov 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/magic-links-10-minutes/https://loginwith.app/blog/magic-links-10-minutes/Short-lived signed URLs over email. Less UX friction than passwords, half the code.Mon, 10 Nov 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/email-password-afternoon/https://loginwith.app/blog/email-password-afternoon/Argon2id, a sessions table, a rate limiter, and a reset flow. Ship it by dinner if you stop second-guessing.Mon, 03 Nov 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/audit-logs-that-help/https://loginwith.app/blog/audit-logs-that-help/Logging everything is logging nothing. Pick the events that matter, structure them properly, and make them searchable.Mon, 27 Oct 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/auth-architecture-for-scale/https://loginwith.app/blog/auth-architecture-for-scale/Four components, clear boundaries, no surprises at 100k users. Boring architecture, predictable performance.Mon, 20 Oct 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/enterprise-sso-prepare-early/https://loginwith.app/blog/enterprise-sso-prepare-early/Four things to architect today so your first enterprise deal doesn't stall a quarter while you retrofit.Mon, 13 Oct 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/session-management-at-100k/https://loginwith.app/blog/session-management-at-100k/Your session table is the first thing that breaks at real scale. Four things to fix before you get there.Mon, 06 Oct 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/how-to-design-roles-permissions/https://loginwith.app/blog/how-to-design-roles-permissions/Start with roles. Add attribute-based rules only when roles break. Don't invent your own policy language.Mon, 29 Sep 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/multi-tenant-from-day-one/https://loginwith.app/blog/multi-tenant-from-day-one/Not "we'll add it later." Later means rewriting every query, and the rewrite is a security bug waiting to happen.Mon, 22 Sep 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/scaling-auth-100-to-10k/https://loginwith.app/blog/scaling-auth-100-to-10k/Nothing breaks at 10k. Plenty of things start to bend. Here's what to fix before you hit real scale.Mon, 15 Sep 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/jwt-mistake-junior/https://loginwith.app/blog/jwt-mistake-junior/Trusting the token without verifying the signature, or accepting `alg: none`. Two bugs, same root cause.Mon, 08 Sep 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/hidden-cost-of-authentication/https://loginwith.app/blog/hidden-cost-of-authentication/The build takes weeks. The maintenance takes forever. Here's the realistic five-year cost of rolling your own.Mon, 01 Sep 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/xss-vs-csrf/https://loginwith.app/blog/xss-vs-csrf/XSS runs code in your origin. CSRF rides your browser. Different threats, different defenses. Confusing them leads to half-applied fixes.Mon, 25 Aug 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/csrf-still-a-thing/https://loginwith.app/blog/csrf-still-a-thing/SameSite=Lax made classic CSRF hard. Rare doesn't mean gone — and several modern patterns bring it back.Mon, 18 Aug 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/rate-limit-login-endpoint/https://loginwith.app/blog/rate-limit-login-endpoint/Not the whole site. The login, password-reset, and MFA endpoints specifically — by account, not just by IP.Mon, 11 Aug 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/login-page-slow/https://loginwith.app/blog/login-page-slow/It's almost always the auth SDK blocking first paint. Here's how to identify and fix it.Mon, 04 Aug 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/email-change-bug/https://loginwith.app/blog/email-change-bug/The classic: change-email without re-auth, combined with a password reset, lets an attacker take over an account.Mon, 28 Jul 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/logging-out-every-15-mins/https://loginwith.app/blog/logging-out-every-15-mins/Short sessions feel secure. They're mostly just annoying, and they push users toward worse habits.Mon, 21 Jul 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/session-fixation-still-exists/https://loginwith.app/blog/session-fixation-still-exists/If you don't rotate the session ID on login, you're vulnerable. Every framework does this automatically — every hand-rolled system forgets.Mon, 14 Jul 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/password-reset-broken/https://loginwith.app/blog/password-reset-broken/Three bugs that almost every hand-rolled reset flow has. Here's how to fix each.Mon, 07 Jul 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/cookies-vs-localstorage/https://loginwith.app/blog/cookies-vs-localstorage/Cookies, unless you have a specific reason not to. The reasons "not to" are usually wrong.Mon, 30 Jun 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/secure-login-flow-best-practices/https://loginwith.app/blog/secure-login-flow-best-practices/Six rules. Apply all of them and you've covered 95% of the attack surface. Skip one and you're in the other 5%.Mon, 23 Jun 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/store-passwords-safely-or-not/https://loginwith.app/blog/store-passwords-safely-or-not/Argon2id if you must. Magic links or SSO if you can. The best password DB is the one you don't have.Mon, 16 Jun 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/oauth-github-login/https://loginwith.app/blog/oauth-github-login/Nearly identical to Google. The quirks: GitHub gives you a real API token, and Apps beat OAuth Apps for anything beyond sign-in.Mon, 09 Jun 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/google-login-15-minutes/https://loginwith.app/blog/google-login-15-minutes/Three steps, well-documented spec, one library call per step. No excuse to let this eat a sprint.Mon, 02 Jun 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/jwt-vs-sessions/https://loginwith.app/blog/jwt-vs-sessions/Sessions are simpler and revocable. Use them unless you have a specific reason JWTs help.Mon, 26 May 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/scim-for-saas-builders/https://loginwith.app/blog/scim-for-saas-builders/A protocol that auto-syncs users from your customer's identity provider. Not optional for enterprise deals past a certain revenue threshold.Mon, 19 May 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/saml-explained-for-devs/https://loginwith.app/blog/saml-explained-for-devs/It's an XML-based SSO protocol from 2005. You'll meet it when your first enterprise customer signs.Mon, 12 May 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/refresh-tokens-do-you-need-them/https://loginwith.app/blog/refresh-tokens-do-you-need-them/If your access token is short-lived and your user is active, probably. If not, you're adding complexity for no benefit.Mon, 05 May 2025 00:00:00 GMTLoginWith teamhttps://loginwith.app/blog/oauth-vs-oidc-for-devs/https://loginwith.app/blog/oauth-vs-oidc-for-devs/OAuth authorizes. OIDC authenticates. Most people mean OIDC.Mon, 28 Apr 2025 00:00:00 GMTLoginWith team