Security Compliance & Auditing
4.0/5.0
VerifiedFreemiumLast technical review:
Markdown for AI (.md)

PrologWAF

A reverse WAF logic perimeter powered by Prolog and DCG parser.

Pricing

$0/mo

Freemium
Score

4.0/5

License
MIT
Last technical review
2026-11-05
Available plansVisit website (opens in a new tab)

Technical Overview

PrologWAF is a reverse web application firewall powered by a native Prolog logic engine, designed for resource-constrained environments and lightweight deployments. It uses a multi-layer DCG parser accelerated by Rust SIMD to evaluate security rules in real-time and output structured JSONL telemetry. It targets developers and security engineers seeking an auditable, deterministic filtering architecture.

Analyst Evaluation: Pros and Limitations

Verified Advantages

  • Native Prolog logic engine with high performance on lightweight hardware.
  • Deterministic DCG parser and SIMD acceleration via Rust FFI.
  • Live telemetry output in JSONL format for real-time analysis.

Technical Considerations

  • Support and deployment model primarily restricted to self-hosted architectures.
  • Steep learning curve required for writing and debugging Prolog rules.

Technical Capabilities & Features

5/7
Included:REST & GraphQL API
Not available:SSO / SAML Authentication
Included:Self-Hosted Option
Included:Full Data Export
Not available:Role-Based Access Control (RBAC)
Included:Custom Domains & SSL
Included:Immutable Audit Logs
Scorecard
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Technical Scorecard: PrologWAF

75/100
DX & Tech Documentation
Favorable
70/100
Pricing Fairness
Excellent
85/100
Security & Governance
Favorable
75/100
Data Portability & Sovereignty
Excellent
80/100
Performance & Reliability
Favorable
65/100

Time to Value & Fit by Segment: PrologWAF

Estimated Time-to-Value1 - 7 days (Agile)

Standard sprint integration without complex external dependencies.

Learning CurveHigh (Specialized)

Requires dedicated DevOps or infrastructure architecture expertise.

Fit Index by Organization Size

Startup & Agile Teams1 to 50 members
70%
Mid-Market & Scaleup50 to 500 members
60%
Corporate Enterprise500+ members
40%
Pricing & TCO
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Pricing

$0.00/mo

Model: FREEMIUM.

Free Tier Verification:

  • No credit card required
  • Commercial use allowed
  • Unlimited usage with no expiration
  • No mandatory watermarks
Get PrologWAF (opens in a new tab)

Billing Risks & Hidden Clauses: PrologWAF

Free Tier Limits:

Available under a self-hosted modality with open-source components for community deployments.

Total Cost of Ownership (TCO) Projection: PrologWAF$0.00/mo
Deterministic cost estimation at 12 and 36 months based on team size, including SSO tax premiums and annual prepay discounts.
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Indie / Solo (1 active user)

Solo developer or independent technical founder.

Base Monthly Cost
$12/month
1 active user
12-Month Investment
$122/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$366total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 3 active users

Calculated infrastructure: VPS 1 vCPU / 2GB RAM (~$5) + 0.5h DevOps/mes ($20)

Annual VPS + DevOps Cost$300/year
Differential vs SaaS LicensingSaaS is $178/year
Startup (10 active users)

Agile engineering team in validation and early traction stage.

Base Monthly Cost
$120/month
10 active users
12-Month Investment
$1,224/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$3,672total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 10 active users

Calculated infrastructure: VPS 2 vCPU / 8GB RAM (~$15) + 2h DevOps/mes ($80)

Annual VPS + DevOps Cost$1,140/year
Differential vs SaaS LicensingSavings of $84/year
Growth (25 active users)

Scaling company with team governance and granular access control requirements.

Base Monthly Cost
$300/month
25 active users
12-Month Investment
$3,060/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$9,180total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 28 active users

Calculated infrastructure: Cluster VPS 4 vCPU / 16GB RAM (~$45) + 6h DevOps/mes ($240)

Annual VPS + DevOps Cost$3,420/year
Differential vs SaaS LicensingSaaS is $360/year
Scaleup (100 active users)

Established organization with enterprise security policies and mandatory SAML/SSO.

Base Monthly Cost
$1,200/month
100 active users
12-Month Investment
$12,240/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$36,720total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 78 active users

Calculated infrastructure: Infraestructura HA redundante + Backups (~$150) + 16h DevOps/mes ($640)

Annual VPS + DevOps Cost$9,480/year
Differential vs SaaS LicensingSavings of $2,760/year
Usage Surcharges & Bill Shock Simulator: PrologWAFWhat usage costs as you scale
Detect overage penalties before they impact engineering budget.
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Prototype / MVP (10 GB)

Included base quota in plan: 5 GB.
Low Risk / Predictable Bill
Base Monthly Rate
$20/mo
Fixed subscription or contracted tier
Overage Penalty
+$1/month extra
Variable surcharge for consumption above plan quota
Estimated Monthly Invoice
$21/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Suitable for development; verify concurrent connection limits.

Base Production (50 GB)

Included base quota in plan: 5 GB.
Low Risk / Predictable Bill
Base Monthly Rate
$20/mo
Fixed subscription or contracted tier
Overage Penalty
+$8/month extra
Variable surcharge for consumption above plan quota
Estimated Monthly Invoice
$28/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Implement table compression policies and temporal partitioning.

Active Growth (250 GB)

Included base quota in plan: 5 GB.
High Risk / Accelerated Overages
Base Monthly Rate
$20/mo
Fixed subscription or contracted tier
Overage Penalty
+$44/month extra
Variable surcharge for consumption above plan quota
Estimated Monthly Invoice
$64/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Offload cold backups to standard object storage (S3).

Large Scale (1.000 GB (1 TB))

Included base quota in plan: 5 GB.
Critical Risk / Severe Bill Shock
Base Monthly Rate
$20/mo
Fixed subscription or contracted tier
Overage Penalty
+$179/month extra
Variable surcharge for consumption above plan quota
Estimated Monthly Invoice
$199/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Migrate to dedicated instance or self-hosted cluster to curtail I/O fees.

Procurement Strategy & Discounts: PrologWAFB2B Negotiation Playbook
Corporate executive level with highest authority to approve budgetary exceptions.
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Fair Market Price & B2B Procurement Benchmark

Non-renewal notice: No contract lock-inMedian achieved discount: -12%
Public List Price
Custom / Contact
100% baseline
Audited Market Average
-12% median
~88% of list price
Optimized Target Price
-20% target
Max achievable discount (Q4 / multi-year): -20%

Verified Tactical Savings Levers

  • Competitive Migration Credit

    Migration credits and buyout of remaining competitor contract period.

Security & Data Exit
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Compliance & Security Standards: PrologWAF

SOC 2 Type IINot reported
ISO 27001Not reported
GDPR / RGPDNot reported
HIPAANot reported
PCI-DSSNot reported
Jurisdiction & Legal Sovereignty
🇺🇸United States [US]Subject to US CLOUD ActDPA On Request
SSO Availability (SAML Enterprise)
No SSO Documented
Data Residency
SELF_HOSTEDGCP
AI Privacy Policy
Not evaluated
Data Liberation & Migration Runbook: PrologWAFJSONL · TXT
Actionable escape runbook and credential export guarantees to mitigate vendor lock-in.
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Supported Structured Export Formats
JSONLTXT
Password Hash Portability
Locked: Proprietary Algorithm / No Export

Credential hashes are guarded under proprietary algorithms and cannot be exported.

CLI Command / Rescue Endpoint
GET /api/export-logs
Exit Protocol & Migration Notes

La exportación de reglas y registros se realiza mediante volcados estándar de base de datos o almacenamiento en archivos de registro en formato JSONL.

Deployment & Infrastructure Requirements: PrologWAFMIT
Hardware specs and Docker directives to run on local servers, dedicated VPS, or Kubernetes without telemetry leak to the cloud.
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Minimum Memory1 GB RAM (Recommended)
Compute CPU1 vCPU
Runtime / LanguageProlog
Code LicenseMIT
Docker CLI Directive
docker run -d --name prologwaf -p 8080:8080 prologwaf:latest
Companion Services & Dependencies:
PostgreSQL 15+Redis 7+
Community & Repository
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Technical Reputation of PrologWAF

68/100 Technical Trust

Frequent Praises in Production

  • Native Prolog logic engine with high performance on lightweight hardware.
  • Deterministic DCG parser and SIMD acceleration via Rust FFI.
  • Live telemetry output in JSONL format for real-time analysis.

Reported Production Frictions

  • Support and deployment model primarily restricted to self-hosted architectures.
  • Steep learning curve required for writing and debugging Prolog rules.
Commercial Treatment & Vendor Lock-in:Requires Sales Contact

Assisted cancellation requiring meeting with account team or contract notice period.

Open source repository activity: PrologWAF8
Stars, forks and release cadence
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Stars8
Forks0
Open Issues0
SPDX LicenseMIT
Latest Commit DetectedNov 3, 2026

Frequently Asked Technical Questions (PrologWAF)

How is the PrologWAF engine deployed in production?

PrologWAF is engineered for resource-optimized instances, allowing deployment on lightweight servers or containers under self-hosted environments.

What technology powers the request analysis?

It utilizes a Definite Clause Grammar (DCG) parser in Prolog combined with an optimized core via Rust FFI and SIMD hardware acceleration.

How are audit and blocking logs exported?

The system generates live network telemetry and detailed logs structured in JSONL format for straightforward integration with external monitoring tools.

Does it require expensive hardware dependencies to operate?

No, the engine operates with zero GPU dependency and is optimized to consume minimal RAM on virtualized environments.

Direct Alternatives

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