Alternatives
10 best Stack Auth alternatives
Tools that cover the same task as Stack Auth (identity), ranked by how completely their pricing, free tier and API access are documented. Checked Oct 4, 2026.
- Stack Auth starts at
- $49/mo
- Free plan
- Free plan
- API
- API available
- 01
PropelAuth
PropelAuth provides authentication and org management built for B2B and AI-native products. The platform covers hosted login UIs, SAML and enterprise SSO, RBAC, API keys, and MCP authentication so teams can ship secure multi-tenant apps faster.
Best for: B2B SaaS and AI-native companies that need multi-tenant auth, enterprise SSO, and org management without building it in-house.
- 02
Modelence
Modelence is an AI app builder that generates production-ready full-stack applications with authentication, MongoDB databases, monitoring, and deployment included. Builders prototype for free, then upgrade to hosted Starter or Pro plans with bundled App Builder credits and optional pay-as-you-go cloud containers.
Best for: Founders and developers who want prompt-generated full-stack apps with managed hosting on Modelence Cloud.
- 03
Authgear
Authgear is an open-source customer and workforce identity platform from Skymakers. It delivers passkeys, passwordless OTP, SAML SSO, adaptive MFA, RBAC, and user management on Authgear Cloud, customer VPC, or self-hosted deployments with data sovereignty options.
Best for: Teams replacing legacy CIAM vendors who need every login method on every tier and portable user exports.
- 04
Medplum
Medplum is an open-source healthcare developer platform for building and running modern clinical apps on FHIR-native infrastructure. It offers hosted cloud tiers and self-hosted options with bots, integrations, authentication, and compliance features aimed at digital health teams shipping production patient-facing software.
Best for: Healthcare engineering teams building FHIR-based apps who need an open-core platform with hosted or self-managed deployment paths.
- 05
Unkey
Unkey is a developer platform for modern APIs that unifies API key management, edge gateways, rate limits, and observability with Git-based deployments. The homepage promises minutes-to-production Docker deploys, preview environments, and a control plane for protecting and routing API traffic globally.
Best for: Teams shipping HTTP APIs who want hosted gateways, key auth, and deployment automation in one vendor stack.
- 06
Better Auth
Better Auth is a TypeScript authentication framework that lives in your application code with plugins for sessions, social login, organizations, passkeys, API keys, and enterprise SSO. The vendor also sells managed infrastructure with dashboards, audit logs, and security detections while the core framework stays open source.
Best for: Developers building Next.js, Nuxt, SvelteKit, Hono, and other TypeScript apps who want composable auth in code plus optional hosted infrastructure.
- 07
Doppio
Doppio is a managed HTML-to-PDF and screenshot API that renders documents without self-hosting Puppeteer. It offers Chromium-based rendering, direct S3 upload, webhooks, templates, and EU-hosted infrastructure for production PDF and PNG generation at scale.
Best for: SaaS teams and agencies that need reliable PDF or screenshot generation from HTML templates in production.
- 08
Ory
Ory provides identity, authentication, authorization, and OAuth2/OIDC services through Ory Network and related open-source projects such as Kratos, Hydra, and Keto. The commercial site targets CIAM, B2B IAM, fine-grained permissions, passkeys, and enterprise SSO for applications that need scalable, API-first identity infrastructure.
Best for: Product and platform teams replacing Auth0-style stacks or self-hosting Ory components who need hosted Ory Network production environments.
- 09
RepoFlow
RepoFlow is a package management platform for hosting private and public artifacts in the cloud or on self-managed infrastructure. The site highlights storage and bandwidth limits, AI-assisted workflows, and team workspaces for DevOps package publishing.
Best for: Development teams that need managed artifact registries with predictable cloud quotas and optional self-hosted deployment.
- 10
Context.dev
Context.dev is a web data API for AI agents and LLMs to scrape pages into Markdown, crawl sites, map domains, run batches, research the web, monitor changes, and retrieve brand data through one REST platform with SDKs and MCP support.
Best for: Developers building agents, RAG apps, or products that need fresh web content without running their own scraping infrastructure.
Stack Auth alternatives: common questions
What is the best free alternative to Stack Auth?
PropelAuth has an ongoing free plan. Free plan includes 10,000 monthly active users, unlimited organizations, waitlist users, custom domain, 2FA, RBAC, and customizable hosted UIs. Free plans change, so check the vendor before relying on one.
What is the cheapest Stack Auth alternative?
Unkey has the lowest listed starting price at $5/mo, compared with $49/mo for Stack Auth.
Which Stack Auth alternatives have an API?
PropelAuth, Authgear, Medplum, Unkey, Better Auth mention API or developer access.