API Development & Testing
4.5/5.0
VerifiedFreeLast technical review:
Markdown for AI (.md)

Castov

Fast, 100% client-side developer platform with CLI and MCP server support.

Pricing

$0/mo

Free
Score

4.5/5

License
MIT
Certifications
1
Last technical review
2026-11-04
Available plansVisit website (opens in a new tab)

Technical Overview

Castov is a client-side developer platform and DevSecOps utility suite providing browser-based tools, a native terminal CLI, and an MCP server for Cursor and Claude. Built for software developers seeking zero-data logging, local cryptographic pipelines, and offline execution without server telemetry.

Analyst Evaluation: Pros and Limitations

Verified Advantages

  • 100% local browser and CLI execution with zero telemetry.
  • Includes a native Model Context Protocol (MCP) server for Cursor and Claude.
  • Over 60 interactive developer tools and chainable data pipelines.

Technical Considerations

  • Lacks native real-time multi-user collaboration features due to its local-first architecture.
  • Does not offer enterprise SSO or centralized cloud audit logging.

Technical Capabilities & Features

3/7
Included:REST & GraphQL API
Not available:SSO / SAML Authentication
Included:Self-Hosted Option
Included:Full Data Export
Not available:Role-Based Access Control (RBAC)
Not available:Custom Domains & SSL
Not available:Immutable Audit Logs
Scorecard
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Technical Scorecard: Castov

88/100
DX & Tech Documentation
Excellent
95/100
Pricing Fairness
Excellent
100/100
Security & Governance
Excellent
85/100
Data Portability & Sovereignty
Excellent
90/100
Performance & Reliability
Favorable
70/100

Time to Value & Fit by Segment: Castov

Estimated Time-to-Value< 1 hour (Immediate)

Near-instantaneous deployment with minimal technical friction.

Learning CurveLow (Intuitive)

Rapid onboarding for developers without prior training required.

Fit Index by Organization Size

Startup & Agile Teams1 to 50 members
90%
Mid-Market & Scaleup50 to 500 members
85%
Corporate Enterprise500+ members
70%
Pricing & TCO
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Pricing

$0.00/mo

Model: FREE.

Available plans:

  • Community / Open Source$0/mo

Free Tier Verification:

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

Billing Risks & Hidden Clauses: Castov

Free Tier Limits:

Completely free open developer platform with no usage restrictions.

Total Cost of Ownership (TCO) Projection: Castov$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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Licensing Cost (1 to 100+ seats)
$0/forever
Unlimited team members with zero penalties
SSO Tax (SAML Enterprise)
$0no surcharge
No artificial security barriers
3-Year Investment (Software TCO)
$0total
operates under a zero-cost or open-source model. Licensing TCO is identical:
Usage Surcharges & Bill Shock Simulator: CastovWhat 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: 10 GB.
Low Risk / Predictable Bill
Base Monthly Rate
$0/mo
Fixed subscription or contracted tier
Overage Penalty
$0/month extra
Usage covered within plan quota
Estimated Monthly Invoice
$0/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: 50 GB.
Low Risk / Predictable Bill
Base Monthly Rate
$0/mo
Fixed subscription or contracted tier
Overage Penalty
$0/month extra
Usage covered within plan quota
Estimated Monthly Invoice
$0/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: 250 GB.
Low Risk / Predictable Bill
Base Monthly Rate
$0/mo
Fixed subscription or contracted tier
Overage Penalty
$0/month extra
Usage covered within plan quota
Estimated Monthly Invoice
$0/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: 1,000 GB.
Low Risk / Predictable Bill
Base Monthly Rate
$0/mo
Fixed subscription or contracted tier
Overage Penalty
$0/month extra
Usage covered within plan quota
Estimated Monthly Invoice
$0/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

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

Security & Data Exit
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Compliance & Security Standards: Castov

SOC 2 Type IINot reported
ISO 27001Not reported
GDPR / RGPDAudited
HIPAANot reported
PCI-DSSNot reported
Jurisdiction & Legal Sovereignty
🇺🇸United States [US]Immune to US CLOUD Act (EU Sovereign)DPA On Request
SSO Availability (SAML Enterprise)
No SSO Documented
Data Residency
SELF_HOSTEDGLOBAL
AI Privacy Policy
Zero customer data retention
Data Liberation & Migration Runbook: CastovJSON · TYPESCRIPT · PLAIN TEXT
Actionable escape runbook and credential export guarantees to mitigate vendor lock-in.
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Supported Structured Export Formats
JSONTYPESCRIPTPLAIN TEXT
Password Hash Portability
Exportable Hashes (Bcrypt / Argon2): Zero Forced Retention

Allows extracting password hashes in standard formats to migrate without forcing user resets.

CLI Command / Rescue Endpoint
npm uninstall -g castov
Exit Protocol & Migration Notes

As a client-side utility platform and local CLI tool, there is no vendor lock-in or proprietary data stored remotely.

Deployment & Infrastructure Requirements: CastovMIT
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 / LanguageTypeScript
Code LicenseMIT
Docker CLI Directive
docker run -d --name castov -p 8080:8080 castov:latest
Companion Services & Dependencies:
PostgreSQL 15+Redis 7+
Community & Repository
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Technical Reputation of Castov

89/100 Technical Trust

Frequent Praises in Production

  • 100% local browser and CLI execution with zero telemetry.
  • Includes a native Model Context Protocol (MCP) server for Cursor and Claude.
  • Over 60 interactive developer tools and chainable data pipelines.

Reported Production Frictions

  • Lacks native real-time multi-user collaboration features due to its local-first architecture.
  • Does not offer enterprise SSO or centralized cloud audit logging.
Commercial Treatment & Vendor Lock-in:1-Click Cancellation

Immediate cancellation from account settings without phone calls or forced retention.

Open source repository activity: Castov1
Stars, forks and release cadence
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Stars1
Forks0
Open Issues0
SPDX LicenseMIT
Latest Commit DetectedNov 2, 2026

Frequently Asked Technical Questions (Castov)

Are input data or developer secrets sent to any external server?

No. All tool executions and data transformations run locally within your browser or local CLI environment, ensuring zero server tracking and complete privacy.

How does Castov integrate with AI coding assistants like Cursor and Claude?

Castov provides a local Model Context Protocol (MCP) server that exposes developer utilities directly inside AI coding environments for local code execution.

Can Castov be used without an internet connection?

Yes. Once loaded in the browser or installed via npm, the toolkit functions completely offline without requiring permanent network connectivity.

Direct Alternatives

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