Tools you can use in your browser, right now.
Quick checks, calculations, format conversions, and sandboxes for security, data, and architecture work. No setup, no sign-in for most tools.
43 browser tools43 open without sign-in
Browse all tools
Cybersecurity19
API Security Scanner
Scan APIs for OWASP Top 10 vulnerabilities, authentication issues, security header misconfigurations, and more.
FreeRuns in browser
Certificate Viewer
Inspect X.509 PEM certificates with basic format validation and SHA-256 fingerprinting (local, in-browser).
FreeRuns in browser
Control Mapping Tool
Map security controls to compliance frameworks like NIST CSF, ISO 27001, and CIS Controls.
FreeRuns in browser
Cookie Checker & Analyser
Analyse cookie security attributes including Secure, HttpOnly, and SameSite flags. Identify security vulnerabilities and GDPR compliance issues with actionable recommendations.
FreeRuns in browser
CVE Impact Analyser
Analyse CVE information to assess real-world impact, exploitability, and remediation priority. Make informed decisions about vulnerability patching.
FreeRuns in browser
DMARC Inspector
Check DMARC and SPF configuration for a domain, with an optional DKIM selector check. Uses read only DNS queries over HTTPS.
FreeRuns in browser
DNS Lookup
Query DNS records and analyse security configuration
FreeRuns in browser
Entropy and Hashing Lab
Learn how hashing works and why tiny input changes can produce completely different outputs. Includes a simple entropy estimate and an avalanche demo.
FreeRuns in browser
Incident Post-Mortem Builder
Create structured post-incident reviews with timelines, root cause analysis, and action items.
FreeRuns in browser
Infrastructure Scanner
Analyze Terraform, CloudFormation, and Kubernetes configs for security misconfigurations and CIS benchmark violations.
FreeRuns in browser
Log Redaction at Scale
Automatically detect and redact sensitive information like emails, phone numbers, tokens, and PII from log files.
FreeRuns in browser
Password Entropy Analyzer
Analyze password strength with entropy calculations, crack time estimates for various hash algorithms, and pattern detection.
FreeRuns in browser
Password Generator
Create cryptographically secure passwords with customisable requirements. Uses your browser
FreeRuns in browser
Risk Register Builder
Create and prioritize security risks with likelihood and impact scoring, mitigations tracking, and exportable reports.
FreeRuns in browser
RSA Encryption Lab
Explore RSA public-key cryptography with small primes. See how key generation, encryption, and decryption work step-by-step in this educational demonstration.
FreeRuns in browser
Security Headers Analyser
Analyse HTTP security headers for security issues and compliance
FreeRuns in browser
Threat Model Generator
Generate comprehensive STRIDE-based threat models for your systems. Build data flow diagrams, identify threats, assess risks, and get mitigation recommendations.
FreeRuns in browser
Threat Modelling Lite
Create threat models using STRIDE methodology with assets, trust boundaries, and threat identification.
FreeRuns in browser
WHOIS Summary
Look up domain registration information including registrar, creation date, expiration, and name servers. Educational tool for understanding domain ownership.
FreeRuns in browser
Architecture12
Regex Tester
Test regular expressions with real-time matching, capture group highlighting, step-by-step explanation, and a built-in cheat sheet. Supports JavaScript, Python, and PCRE flavours.
FreeRuns in browser
API Spec Viewer
View and explore OpenAPI (Swagger) specifications. Browse endpoints, schemas, parameters, and responses in an interactive viewer.
FreeRuns in browser
Architecture Tradeoff Analysis
Systematically evaluate architectural options against constraints and criteria. Make informed decisions by comparing trade-offs across multiple dimensions.
FreeRuns in browser
Automation Studio Canvas
Model workflow orchestration, runbook flows, and execution handoffs with an automation-focused canvas.
FreeRuns in browser
Base64 Encoder/Decoder
Encode text or files to Base64, or decode Base64 back to its original form. Supports URL-safe encoding and file uploads.
FreeRuns in browser
C4 Studio Canvas
Create C4 context, container, and component architecture diagrams for system design documentation.
FreeRuns in browser
Decision Log Generator
Create structured Architecture Decision Records (ADRs) to document important technical decisions, their context, options considered, and rationale.
FreeRuns in browser
Enterprise Architecture Canvas
Build enterprise architecture models using TOGAF with capability, roadmap, and governance templates.
FreeRuns in browser
JavaScript Sandbox
Execute JavaScript code directly in your browser. Test algorithms, explore language features, and experiment with code snippets in a safe, isolated environment.
FreeRuns in browser
Logic Gates Simulator
Explore fundamental digital logic gates (AND, OR, XOR) with interactive inputs and truth tables. Perfect for learning computer architecture basics.
FreeRuns in browser
Sequence Diagram Generator
Create UML sequence diagrams for system design and documentation. Export as Mermaid or PlantUML syntax for use in your projects.
FreeRuns in browser
Technical Debt Qualifier
Assess and prioritize technical debt items based on impact, urgency, and cost to fix. Get actionable recommendations for debt management.
FreeRuns in browser
Data5
CSV Profiler
Analyse CSV data to understand structure, detect data quality issues, and get insights about your dataset. Runs entirely in your browser for privacy.
FreeRuns in browser
Data Classification Helper
Classify data assets by sensitivity level and compliance requirements. Generate handling guidelines and recommended security controls.
FreeRuns in browser
Metrics Definition Studio
Create standardised metric definitions with clear calculations, units, and data sources. Generate documentation for your analytics team.
FreeRuns in browser
Schema Inspector
Parse and analyse database schemas. Supports JSON Schema and SQL DDL formats. Extract entities, columns, types, and constraints.
FreeRuns in browser
SQL Sandbox
Practice SQL queries with an in-browser SQLite database. Features syntax highlighting, interactive results table, and a schema browser.
FreeRuns in browser
Developer, AI & Digital7
JSON Schema Validator
Validates JSON against schemas (draft-04 to 2020-12) with visual schema builder, instant feedback, and actionable error paths. Catches API contract violations before deployment.
FreeRuns in browser
OpenAPI Spec Validator
Validates OpenAPI 2.0, 3.0, and 3.1 specifications with $ref resolution, breaking change detection, and compatibility checking. Enforces API contracts across teams.
FreeRuns in browser
RDF / SHACL Validator
Runs SHACL shape-constraint validation against RDF/XML graphs. Handles LTDS Stage 3 CIM profiles, custom shapes, and general RDF data quality checks. Everything runs in your browser.
FreeRuns in browser
Python Playground
Run Python in your browser via Pyodide. Test data analysis, scientific computing, and small scripts without leaving the page.
FreeRuns in browser
Code Lab
Test code snippets in JavaScript, Python, or SQL directly in your browser without setup or installation.
FreeRuns in browser
Process Friction Mapper
Identify and map friction points in business processes. Visualize bottlenecks, inefficiencies, and opportunities for digital transformation.
FreeRuns in browser
OmniCalc
Advanced scientific calculator with formula exploration, 3D graphing, unit conversions, and domain-specific plugins for physics, finance, statistics, and engineering.
FreeRuns in browser
Prefer structured theory first?
Eight courses covering cybersecurity, AI, data, and architecture.