Alternatives
10 best SpamAssassin alternatives
Tools that cover the same task as SpamAssassin (security), ranked by how completely their pricing, free tier and API access are documented. Checked Oct 4, 2026.
- SpamAssassin starts at
- Not listed
- Free plan
- Free plan
- API
- API unknown
- 01
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.
- 02
Pritunl
Pritunl is an open-source enterprise VPN platform for OpenVPN, WireGuard, and IPsec with a web management UI, multi-host clustering over MongoDB, and optional premium features such as SSO and site-to-site links. It targets self-hosted remote access and VPC peering across clouds.
Best for: Infrastructure teams needing self-hosted VPN with horizontal scaling and enterprise authentication options.
- 03
Castle
Castle provides SDKs and APIs to detect bots, monitor risky logins, and stop account abuse using device, email, IP, and behavioral intelligence. Teams integrate Castle to score traffic and automate policy actions in web and mobile apps.
Best for: Product and fraud teams at consumer apps that need bot detection, account takeover protection, and IP intelligence without heavy integration friction.
- 04
WorkOS
WorkOS helps SaaS companies add enterprise-ready authentication features such as SSO, Directory Sync, MFA, Audit Logs, and AuthKit user management with minimal integration code. The platform targets staging and production environments with modular APIs for B2B customer IT requirements.
Best for: B2B software vendors selling to enterprise customers who need SSO, SCIM, compliance logging, and self-serve IT onboarding.
- 05
Cloudanix
Cloudanix is a CNAPP+ platform spanning code, cloud, access, and agentic security on one graph. It offers CSPM, CIEM, workload protection, just-in-time access, coding-agent guardrails, and LLM-native investigation across AWS, Azure, GCP, and Kubernetes with self-serve Pro SKUs and enterprise options.
Best for: Security and platform engineering teams needing unified cloud posture, runtime protection, JIT access, and guardrails for AI coding agents.
- 06
Aserto
Aserto provides cloud-native authorization as a service with fine-grained RBAC, ABAC, or ACL enforced in about a millisecond. Developers use SDKs, policy repositories, and authorizer instances to centralize permissions for applications and APIs.
Best for: Teams adding centralized, low-latency authorization to SaaS apps, especially alongside Auth0 or similar identity providers.
- 07
Novu
Novu is open-source notification infrastructure for connecting AI agents and products to customers across in-app, email, SMS, push, WhatsApp, Slack, Teams, and Telegram channels. Cloud plans meter workflow runs while enterprise options add compliance, residency, and self-hosted deployment.
Best for: Product and platform teams that need multi-channel notification workflows with inbox components and usage-based scaling.
- 08
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.
- 09
Mem0
Mem0 provides persistent memory infrastructure for AI agents and applications so context survives across sessions, users, and agents. The platform offers hosted plans with SDK integration plus open-source options for developers building production agents that need durable recall.
Best for: Agent builders and app teams that need hosted memory layers with defined add and retrieval quotas.
- 10
AppVeyor
AppVeyor is a hosted CI/CD service for Windows, Linux, and macOS that connects to source control and runs builds on cloud VMs with admin access. It supports multi-stage deployments, self-hosted build agents, and parallel jobs for teams shipping cross-platform software.
Best for: Developers and release teams that need Windows-friendly CI/CD alongside Linux and macOS build agents.
SpamAssassin alternatives: common questions
What is the best free alternative to SpamAssassin?
Ory has an ongoing free plan. Pricing lists a Developer plan marked Free for getting started on Ory Network before production tiers. Free plans change, so check the vendor before relying on one.
What is the cheapest SpamAssassin alternative?
Aserto has the lowest listed starting price at $0.20/mo.
Which SpamAssassin alternatives have an API?
Ory, Pritunl, Castle, WorkOS, Cloudanix mention API or developer access.