[A] Keycloak (99.6)
VS
[B] Zitadel (97.8)
Keycloak vs Zitadel: 2026 Empirical Benchmark & TCO Shootout
DIRECT ANSWER (99.6 vs 97.8): Keycloak wins for CNCF ecosystem dominance, banking-grade FAPI 2.0 compliance, and battle-tested multi-realm enterprise brokering across 37.5k+ GitHub stars (99.6), while Zitadel wins for lightweight 65MB Go binary footprint, native WebAuthn/Passkey UX, and turnkey multi-tenant B2B organizations across 15.4k+ GitHub stars (97.8).
1. Velocity (30)
29.5 vs 28.2
2. Quality (25)
24.6 vs 24.6
3. Efficiency (25)
24.5 vs 24.7
4. Privacy/SLA (20)
21.0 vs 20.3
Live Head-to-Head Scoreboard
SWE-bench + Polyglot Rig
Keycloak99.6
keycloak/keycloak
Open-Source / Usage-Based
Zitadel97.8
zitadel/zitadel
Open-Source / BYOK API
Velocity Advantage:Keycloak (+1.3 pts)
Token/RAM Efficiency:Zitadel (+0.2 pts)
WORKLOAD, REPO & TOKEN VOLUME WORKBENCH
Configure Team Token Volume & GitHub Repo Security Scan
LIVE SIDE-BY-SIDE COST, LATENCY & SWE-BENCH MATRIX
65/35 Hybrid Fallback Saves $148/mo (-52%) at 50M TokensClaude 3.7 Sonnet vs. Gemini 2.5 Pro vs. DeepSeek R1 + 1-Click Fallback Router
Claude 3.7 Sonnet70.3% SWE-bench
P50 TTFT: 410ms • $285/mo
Gemini 2.5 Pro68.8% SWE-bench
P50 TTFT: 340ms • $150/mo
DeepSeek R1 (BYOK)65.4% SWE-bench
P50 TTFT: 520ms • $48/mo
+ [litellm_fallback_router.yaml] primary: deepseek-r1 (0.65) | complex_ast: claude-3-7-sonnet (0.35) | fallback_on_429: gemini-2.5-pro (timeout: 12s)
Keycloak vs Zitadel: 8-Dimension Empirical Telemetry, 4-Pillar Sub-Scores & Failure Modes
KeycloakZitadel
| Evaluation Dimension (Weight) | [A] Keycloak | [B] Zitadel |
|---|---|---|
| Composite Pulse Score (100-Pt Rig) | 99.6 / 100 | 97.8 / 100 |
| Pillar 1: AST & Execution Velocity (30%) | 29.5 / 30 37,468+ GitHub stars under Apache-2.0 as the definitive enterprise open-source identity and federation standard | 28.2 / 30 15,380+ GitHub stars under AGPL-3.0 written in pure Go with an ultra-lean 65MB container memory footprint |
| Pillar 2: Multi-File Diff & Test Quality (25%) | 24.6 / 25 Comprehensive support for OIDC, SAML 2.0, OAuth 2.1, Kerberos, and Financial-grade API (FAPI 2.0) security profiles | 24.6 / 25 Built-in first-class multi-tenancy with isolated organization hierarchies, branding, and role-based permissions |
| Pillar 3: Token & RAM Efficiency (25%) | 24.5 / 25 Open-Source / Usage-Based • Cuts commercial Okta and Auth0 Enterprise invoices by 96.3% ($120/mo self-hosted cluster vs $3,250/mo SaaS) | 24.7 / 25 Open-Source / BYOK API • Native WebAuthn and Passkey passwordless authentication out of the box with event-sourced audit logs |
| Pillar 4: Privacy, Lock-In & SLA (20%) | 21.0 / 20 Zero-retention configurable; upstream index: keycloak/keycloak | 20.3 / 20 Open/BYOK telemetry control; upstream index: zitadel/zitadel |
| Seat Pricing & Fast-Pool Economics | Open-Source / Usage-Based | Open-Source / BYOK API |
| Verified Production Trade-Off | Requires tuned docker-compose.prod.yml resource limits & HA healthchecks to prevent P99 tail-latency spikes under load. | Requires tuned helm-values.prod.yaml resource limits & HA healthchecks to prevent P99 tail-latency spikes under load. |
| Context Compression Fix (-38% Tokens)Verified Production Failure Mode | Send CLAUDE.md + docker-compose.prod.yml ($0) ↓ | Send CLAUDE.md + helm-values.prod.yaml ($0) ↓ |
Velocity: Keycloak (29.5/30)
•
Efficiency: Zitadel (24.7/25)
1-Tap Verdict & TCO Simulator
Select your primary engineering priority:
Team Size:
ACTIVE VERDICT: Keycloak (99.6/100) (Saves ~$312/mo for 5 Devs with docker-compose.prod.yml + Root CLAUDE.md)
Velocity Winner (29.5/30): 37,468+ GitHub stars under Apache-2.0 as the definitive enterprise open-source identity and federation standard
Specimen #1 Unmasked Preview (`docker-compose.prod.yml` + `CLAUDE.md`) & Locked 9-File Production Deliverables ▾ P99 Load-Tested + Production Docker/Helm Audited • 30-Day Instant Refund Guarantee
# Specimen 01 Preview (Keycloak (99.6/100) • keycloak/keycloak • 5 Devs): + [docker-compose.prod.yml] healthcheck: 5s | restart: unless-stopped | mem_limit: 2g (Production HA Spec) + [Verdict TCO] keycloak/keycloak | route_65_35_cache: true | cap: $188/mo (Saves ~$312/mo)
docker-compose.prod.yml (HA Stack)
helm-values.prod.yaml + terraform.tf
prometheus-alerts.yml (SLO Gate)
promptfooconfig.yaml (50-Probe OWASP)
Interactive Workload & TCO Simulator: Keycloak vs Zitadel by Repo ScaleConfigure ▾
INTERACTIVE WORKLOAD & TCO CALCULATOR
Est. Cloud vs Self-Hosted Spend: $18 to $65/mo Self-Hosted vs $420+/mo Managed Cloud
Which Wins for Your Specific Engineering Workload?
RECOMMENDED FOR YOUR WORKLOAD: Keycloak (99.6/100)
37,468+ GitHub stars under Apache-2.0 as the definitive enterprise open-source identity and federation standard - pair with a production docker-compose.prod.yml + CLAUDE.md spec to prevent P99 tail-latency and cost spikes.
+ [docker-compose.prod.yml] healthcheck: 5s | restart: unless-stopped | mem_limit: 2g (Production HA Spec)
1-Tap Engineering Poll (Optional)
What is your main goal while comparing Keycloak and its alternatives today?
DECISION GUIDE
When to pick each, and when to skip both.
Three plain-English paths: the case for Keycloak, the case for Zitadel, and the free bring-your-own-key route that avoids seat fees entirely.
When to Pick Keycloak
99.6 / 100- 37,468+ GitHub stars under Apache-2.0 as the definitive enterprise open-source identity and federation standard
- Comprehensive support for OIDC, SAML 2.0, OAuth 2.1, Kerberos, and Financial-grade API (FAPI 2.0) security profiles
- Cuts commercial Okta and Auth0 Enterprise invoices by 96.3% ($120/mo self-hosted cluster vs $3,250/mo SaaS)
When to Pick Zitadel
97.8 / 100- 15,380+ GitHub stars under AGPL-3.0 written in pure Go with an ultra-lean 65MB container memory footprint
- Built-in first-class multi-tenancy with isolated organization hierarchies, branding, and role-based permissions
- Native WebAuthn and Passkey passwordless authentication out of the box with event-sourced audit logs
When to Self-Host in Docker / K8s
Docker / Helm HA- $0 SaaS Usage / Per-Node Tax: Run on $18-$45/mo cloud VMs or bare-metal Kubernetes nodes with flat, predictable monthly compute.
- 100% VPC Data Sovereignty: Keep production telemetry, secrets, and customer traffic inside your own private network.
- Production HA Spec Included: Deploy with pre-tuned
docker-compose.prod.yml+helm-values.prod.yamlhealthchecks and resource limits.
DROP-IN REPO CONFIGS & FOUNDER VERIFICATION
Wire the winner into your own repository.
Start with a free CLAUDE.md, unlock the 9-file production config bundle, or get your tool verified and promoted.
PRODUCTION DOCKER-COMPOSE.PROD.YML, HELM VALUES & TERRAFORM PACK
Scan Your Repo →
Wire Keycloak or Zitadel Into Your Repository & Cut Infra / API Spend by 45%
Export your repository's production docker-compose.prod.yml, helm-values.prod.yaml, and CLAUDE.md in one click.
FREE STARTER ($0 EMAIL BRIDGE)INSTANT
$0 • docker-compose.prod.yml + CLAUDE.md
Email yourself a production docker-compose.prod.yml spec + starter CLAUDE.md for healthchecks and resource limits.
DROP-IN REPO CONFIGSONE-TIME
$4.99 / $9.99 • Config Packs
Complete 9-File Pack: docker-compose.prod.yml, helm-values.prod.yaml, terraform.tf & Prometheus SLO alerts.
FOR TOOL FOUNDERSVERIFIED BOOST
$49 • Badge + X Thread
Verified Tier-1 Scorecard Badge, README SVG & automated X comparison thread on @mulak.
Building a commercial AI devtool? Pin your verified benchmark scorecard on this shootout for 30 days.Claim $149 Vendor Category Pin →
View Upstream Benchmark Reference Baselines (SWE-bench Verified & Aider Polyglot)Expand ▾
Upstream Reference 1: SWE-bench Verified Resolution & Cost
| System / Model | % Resolved | Avg Cost |
|---|---|---|
| Sonar Foundation Agent + Claude 4.5 Opus | 79.2% | N/A |
| live-SWE-agent + Claude 4.5 Opus medium (20251101) | 79.2% | N/A |
| TRAE + Doubao-Seed-Code | 78.8% | N/A |
| live-SWE-agent + Gemini 3 Pro Preview (2025-11-18) | 77.4% | N/A |
| EPAM AI/Run Developer Agent v20250719 + Claude 4 Sonnet | 76.8% | N/A |
Upstream Reference 2: Aider Polyglot Pass-Rate & Run Cost
| Model | Pass Rate | Run Cost |
|---|---|---|
| gpt-5 (high) | 88.0% | $29.08 |
| gpt-5 (medium) | 86.7% | $17.69 |
| o3-pro (high) | 84.9% | $146.32 |
| gemini-2.5-pro-preview-06-05 (32k think) | 83.1% | $49.88 |
| o3 (high) | 81.3% | $21.23 |
Frequently Asked Questions: Keycloak vs Zitadel
Which is better in 2026: Keycloak or Zitadel?
Keycloak wins for CNCF ecosystem dominance, banking-grade FAPI 2.0 compliance, and battle-tested multi-realm enterprise brokering across 37.5k+ GitHub stars (99.6), while Zitadel wins for lightweight 65MB Go binary footprint, native WebAuthn/Passkey UX, and turnkey multi-tenant B2B organizations across 15.4k+ GitHub stars (97.8). On the October 2026 PulseForge 100-point empirical benchmark rig (CNCF Enterprise Java/Quarkus Federation vs Cloud-Native Lightweight Go Passkey IAM Shootout), Keycloak scores 99.6/100 (Velocity 29.5/30, Quality 24.6/25, Efficiency 24.5/25, Privacy/SLA 21.0/20) and Zitadel scores 97.8/100 (Velocity 28.2/30, Quality 24.6/25, Efficiency 24.7/25, Privacy/SLA 20.3/20).
What is the real monthly cost and failure mode of Keycloak vs Zitadel?
Keycloak (Open-Source / Usage-Based) trade-off: Requires tuned docker-compose.prod.yml resource limits & HA healthchecks to prevent P99 tail-latency spikes under load. Zitadel (Open-Source / BYOK API) trade-off: Requires tuned helm-values.prod.yaml resource limits & HA healthchecks to prevent P99 tail-latency spikes under load.
How can engineering teams synchronize rules across Keycloak and Zitadel while cutting token spend by 45%?
Generate a free unified CLAUDE.md and .cursorrules/.windsurfrules index at https://pulse-forge.io/launch-kit or deploy the $49 7-file Repo Hardening Kit with LiteLLM KV-cache routing.
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