a working library of free utilities for SEO, security, developer, and site-operations work.
workflow hubs / 12
a hub groups the tools you'd actually reach for in order for one job — validating uploads, shipping SEO content, auditing a domain — instead of making you hunt through 43 categories one step at a time. each hub links out to the specific tools in sequence; the index below still has all 645 on their own.
File Type Validation Hub
Design upload allowlists, verify signatures, and enforce filename policy.
open hub → seo · 58 toolsContent Ops Hub
Run planning, consolidation, and publishing workflows with SEO-ready templates.
open hub → seo · 58 toolsTechnical SEO Audit Hub
Audit crawlability, indexability, and schema coverage with actionable checklists.
open hub → security · 16 toolsSecurity Posture Workflow
Harden headers, token handling, secrets, and integrity controls in one path.
open hub → api tools · 19 toolsAPI Integration Workflow
Design, validate, debug, and monitor API integrations before production rollout.
open hub → devops · 12 toolsRelease Reliability Workflow
Prepare deploy plans, rollback strategy, and server configs for safer releases.
open hub → domain tools · 30 toolsDomain Trust Audit Hub
Audit DNS, TLS, email auth, and domain reputation signals end to end.
open hub → performance · 15 toolsCore Web Performance Audit
Run speed, cache, script, and network diagnostics with fix-oriented sequencing.
open hub → privacy · 14 toolsPrivacy Compliance Ops
Operationalize consent, policy, DSAR, and retention controls across teams.
open hub → monitoring · 13 toolsIncident Observability Workflow
Define severity, thresholds, and SLO budget management for incident response.
open hub → data · 12 toolsData Quality Pipeline Hub
Validate schemas, encodings, sampling, and batch sizing for clean ingestion.
open hub → analytics tools · 9 toolsTool Usage Reporting Hub
Turn weekly export rows into tool/category leaderboards and action queues.
open hub →browse the index / 43 categories
- Amp Page Validator
- Breadcrumb Schema Generator
- Broken Link Checker
- Canonical Tag Checker
- Content Brief Generator
- Archive Format Advisor
- Archive Integrity Command Builder
- Archive Ratio Estimator
- Backup Rotation Planner
- Best Tools for File Upload Security
- API Integration Checklist
- API Integration Workflow
- API Mocker
- API Versioning Strategy Mapper
- Best Tools API Testing
- Box Shadow Generator
- CSS Animation Generator
- CSS Border Radius Generator
- CSS Clip Path Generator
- CSS Color Contrast Checker
- API Key Rotation Planner
- Csp Generator
- Csp Report Triage Mapper
- CSP vs SRI vs Security Headers
- CSRF Token Policy Checker
- Asset Load Analyzer
- Best Tools Improve Site Speed
- Cache Header Checker
- Compression Checker
- Core Web Performance Audit
- Consent Proof Log Template Builder
- Cookie Category Policy Mapper
- Cookie Scanner
- Data Processing Inventory
- Data Retention Planner
- Backup Size Calculator
- Connection Pool Sizer
- Connection String Generator
- Data Type Reference
- Index Advisor
- Alert Fatigue Scorer
- Alert Threshold Calculator
- Error Rate Calculator
- Incident Ack Coverage Checker
- Incident Response Observability
- Accessible Name Inspector
- Alt Text Analyzer
- ARIA Reference
- Colorblind Simulator
- Error Message Checker
- Autoscaling Threshold Planner
- CDN Cache Calculator
- CIDR Calculator
- Cloud Egress Cost Estimator
- Cloud Pricing Converter
- Avro Schema Compatibility Checker
- Batch Size Calculator
- CSV Column Analyzer
- Data Quality Pipeline
- Data Sampling Calculator
- Crontab Generator
- Docker Compose Linter
- How to Prepare Production Deployment
- Htaccess Generator
- Letsencrypt Generator
- App Bundle Size Estimator
- App Icon Sizes
- App Store Character Counter
- Battery Drain Estimator
- Deep Link Builder
- CORS Policy Generator
- Encryption Strength Guide
- Hash Identifier
- JWT Claims Inspector
- Password Strength Analyzer
- A/B Test Calculator
- Churn Rate Calculator
- Cohort Retention Calculator
- Conversion Rate Calculator
- Funnel Calculator
- API Endpoint Documenter
- Changelog Generator
- Code Comment Generator
- Contributing Guide Generator
- Editorial Calendar Generator
- Base64 Image Encoder
- Compression Savings Estimator
- Favicon Generator
- Image to CSS Gradient
- Placeholder Generator
- API Response Mocker
- Boundary Value Analyzer
- Error Code Reference
- JSON Schema Validator
- Load Time Estimator
- Block Time Calculator
- Crypto Unit Converter
- Gas Fee Calculator
- Hash Rate Calculator
- Private Key Formats
- Audio Bitrate Calculator
- Audio File Size Calculator
- Frame Rate Calculator
- Streaming Bandwidth Calculator
- Video Aspect Ratio
no matching categories found.
faq
- is this actually free?
- yes — every tool on this site is free, with no signup and no usage limits.
- what's the difference between a workflow hub and the category index?
- the index below is every tool, alphabetical by category. hubs are a shortcut for a specific job — they link out to the 3-6 tools you'd actually use in sequence, skipping the browsing.
- do i need an account?
- no. no login, no email, no tracking beyond standard analytics.
- can i use these tools in a script or CI pipeline?
- the site itself is built for one-off, manual checks — but a subset of tools is also available as a metered API you can call from scripts and CI. see api-tools for plans and keys.
- how often are new tools added?
- this is a working library, not a fixed set — new tools and hubs ship as real workflows surface a gap.