Keycloak vs Mimecast: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Keycloak and Mimecast side by side. This page compares data; it is not a hands-on review.
On the data: On the data below, Keycloak leads on a free plan. We do not name an overall winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Keycloak
Open-source identity and access management
Best for you if:
- • You want a fully free tool (Mimecast requires payment)
Mimecast
AI-powered human risk management and advanced email security for modern organizations.
Best for you if:
- • You want unified platform for email security, human risk, and insider risk management
| At a Glance | Mimecast | |
|---|---|---|
Starts at | Free 100% free | Not published |
Category | Identity & Access Security | Security Email |
Rating | n/a | 4.4/5 G2 4.4 · Capterra 4.3 440 reviews |
Free plan | Yes | No |
Choose Keycloak or Mimecast?
Choose Keycloak if
- You want a fully free tool (Mimecast requires payment)
- You want open source identity
- You want self-hostable
- You work in identity & access, not security
Choose Mimecast if
- You want unified platform for email security, human risk, and insider risk management
- You want leverages advanced AI and decades of threat intelligence for superior protection
- You work in security, not identity & access
In-Depth Analysis
Keycloak
Open-source identity and access management
Keycloak's pricing is exceptionally generous, being entirely free as an open-source solution.
Strengths
- Pro: Open source identity
- Pro: Self-hostable
- Pro: Feature rich
- Pro: No per-user cost
- Pro: Enterprise ready
Weaknesses
- Con: Complex to set up
- Con: Requires maintenance
- Con: Learning curve
- Con: Java-based
- Con: UI dated
Key features
Mimecast
AI-powered human risk management and advanced email security for modern organizations.
Strengths
- Pro: Unified platform for email security, human risk, and insider risk management.
- Pro: Leverages advanced AI and decades of threat intelligence for superior protection.
- Pro: Recognized as a leader in Gartner Magic Quadrants for Email Security and Digital Communications Governance.
- Pro: Offers rapid deployment and actionable insights for insider risk management without complex policy setup.
- Pro: Reduces shadow AI use and promotes secure adoption of AI tools.
Weaknesses
- Con: No free tier available for evaluation.
- Con: Requires integration with existing systems, which might have an initial setup phase.
Key features
Plans and prices: Keycloak vs Mimecast
| Tool | Plans and prices | Source |
|---|---|---|
| Keycloak |
| keycloak.org read Sep 28, 2026 |
| Mimecast | No plan prices on file | mimecast.com |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Keycloak pricing and Mimecast pricing.
Key Takeaways
Keycloak
- Has a free plan
Mimecast
- Choose if you want AI-powered human risk management and advanced email security for modern organizations
What the data shows
On the data below, Keycloak leads on a free plan. We do not name an overall winner for this pair.
- Only Mimecast has a published user rating (4.4/5 from 440 reviews); Keycloak has none we can show.
- Only Keycloak has a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Keycloak and Mimecast compare in 2026?
On the data below, Keycloak leads on a free plan. We do not name an overall winner for this pair. Only Mimecast has a published user rating (4.4/5 from 440 reviews); Keycloak has none we can show. Only Keycloak has a free plan.
What are Keycloak and Mimecast used for?
Keycloak: Open-source identity and access management. Mimecast: AI-powered human risk management and advanced email security for modern organizations.
What does Keycloak cost vs Mimecast?
Keycloak is free. Mimecast has no public paid-plan price on file. Prices read on the vendors' pricing pages, latest check Sep 28, 2026.
What's the main difference between Keycloak and Mimecast?
Keycloak's main strength: open source identity. Mimecast's main strength: unified platform for email security, human risk, and insider risk management.