Catalogue
Tools
109 instruments, each answering one question exactly. No sign-up, nothing stored, and every one of them runs in this tab unless its page says otherwise.
01 · Git
9
Git Commit Message LinterConventional Commits spec check with exact failure reasons, plus a picker for which type to use if you're not sure.CODEOWNERS GeneratorPath patterns to owners - valid CODEOWNERS file, bottom-to-top matching explained..gitattributes GeneratorLine endings, language diff settings, Git LFS, and vendored paths in one file.Git Hooks GeneratorPick a hook type and checks, get a working shell script plus install steps.Branch Naming Convention CheckerCheck a branch name against type/description, Jira-style, or kebab-case.Squash vs Merge vs Rebase ExplainerWhat you care about to a recommended merge strategy, with the real tradeoffs shown.Merge Conflict Complexity EstimatorFile overlap and edit density between two branches to a conflict-risk score before you merge..gitignore GeneratorMerge and dedupe standard .gitignore patterns for 15+ stacks.Changelog / Release Notes GeneratorVersioned entries to Keep a Changelog-formatted markdown.
02 · GitHub
3
PR Description GeneratorSummary, changes, and testing notes to a clean, template-formatted pull request description.README Badge GeneratorPick a preset or customize - a working shields.io badge URL and markdown, live preview included.GitHub Actions Workflow GeneratorTrigger, runtime, and steps to a complete, valid workflow YAML.
03 · Docker
5
Dockerfile Layer-Size Estimator/LinterStatic lint for common Dockerfile anti-patterns..dockerignore GeneratorPick your stack, get a merged .dockerignore that keeps build context small.Docker Multi-Stage Build AnalyzerPaste a Dockerfile - see if it is multi-stage and whether splitting build tooling out would help.Docker HEALTHCHECK GeneratorHTTP, TCP, or custom command to a valid Dockerfile HEALTHCHECK instruction.Docker Compose GeneratorPick common services, get a valid docker-compose.yml with dependencies.
04 · Kubernetes
6
Kubernetes Resource Request/Limit CalculatorAverage and peak memory/CPU usage to a resources.requests/limits YAML snippet.Kubernetes Probe GeneratorLiveness, readiness, or startup - HTTP, TCP, or exec - a valid probe YAML block with correct successThreshold rules.Kubernetes HPA CalculatorCurrent replicas and utilization to the exact replica count the HPA controller would scale to, plus a valid HPA YAML.Kubernetes ConfigMap / Secret GeneratorKey-value pairs to a valid ConfigMap or Secret manifest, Secret values base64-encoded correctly.Kubernetes Ingress GeneratorHost, path, backend service, and optional TLS - a valid networking.k8s.io/v1 Ingress manifest.Kubernetes PodDisruptionBudget CalculatorReplica count and minAvailable/maxUnavailable to exactly how many pods can be evicted at once, plus a valid PDB manifest.
05 · Security
9
CORS Config Generator/ExplainerOrigins, methods, headers to generated CORS headers.Security Risk ScannerPaste a real GitHub repo - hardcoded secrets, unsafe dynamic execution, string-built SQL, insecure transport, and weak cryptography. Sign in required.JWT InspectorDecode a JWT header and payload, check expiry - decode-only, signing key never needed.Bcrypt Cost Factor CalculatorA measured benchmark on your hardware plus a target hash time to the right bcrypt cost factor.AWS IAM Policy GeneratorService, access level, and a resource ARN to a valid, scoped IAM policy JSON.API Key Format IdentifierPaste a key prefix - which service it belongs to, based on documented prefix conventions.OAuth Redirect URI ValidatorCheck a redirect URI against the OAuth 2.0 Security BCP - HTTPS, exact-match, no wildcards.Session Cookie Security CheckerPaste a Set-Cookie header - HttpOnly, Secure, SameSite checked, each missing flag mapped to its risk.CORS Preflight SimulatorMethod, Content-Type, and headers - whether a preflight OPTIONS request fires, per the Fetch spec.
06 · Networking
5
HTTP Header AnalyzerPaste response headers, get plain-English explanations.Subnet CalculatorCIDR notation to network address, broadcast address, subnet mask, and usable host range.CIDR Overlap CheckerCheck whether two CIDR blocks overlap - catch VPC peering and routing conflicts before provisioning.Rate Limit Header ExplainerPaste X-RateLimit or RateLimit response headers - remaining quota and reset time in plain English.Nginx / Apache Config GeneratorReverse proxy, SSL redirect, gzip - a valid server block or VirtualHost.
07 · Database
6
DB Connection String Builder/ParserPostgres, MySQL, MongoDB - parse or build connection strings.Redis Memory EstimatorKey count, avg key/value size, and data structure to an estimated Redis memory footprint.Connection Pool Sizing CalculatorRequests/sec and avg query time, via Little's Law, to a recommended pool size.SQL Query FormatterPaste a one-line SQL query - broken onto clauses with keywords uppercased.Index Selectivity EstimatorTotal rows and distinct values in a column to a selectivity score - will an index actually help.Data Migration Risk CalculatorRow count, downtime tolerance, rollback complexity to risk level.
08 · API
7
API Rate-Limit Budget CalculatorRate limit and usage pattern to time-until-exhausted.Curl-to-Code ConverterPaste a curl command, get Python, JS, Go, or Rust.Webhook Payload Validator/FormatterPretty-print and detect Stripe/GitHub/Slack payload shapes.OpenAPI ValidatorStructural checks on a JSON OpenAPI spec - missing responses, missing fields, broken $ref pointers.GraphQL Query Complexity EstimatorPaste a GraphQL query - field count and nesting depth to a complexity score and risk level.HTTP Status Code ReferenceSearch HTTP status codes by number or name - what each one actually means.API Deprecation Notice GeneratorFeature, replacement, sunset date - RFC 8594 Deprecation/Sunset headers plus a docs notice.
09 · CI/CD
5
.env File Diff/ValidatorCompare two .env files by key name only - values never processed.Build Cache Hit-Rate EstimatorBuild time with and without cache, plus hit rate, to hours saved per month.Pipeline Duration Budget CalculatorList CI stages and a target budget - total duration, overage, and which stage to optimize first.Deployment Frequency CalculatorDeployments over a period, classified against the DORA Elite/High/Medium/Low tiers.CI/CD Pipeline Config GeneratorGitLab CI or CircleCI - stages, runtime, and caching to a valid config.
10 · Cloud
4
Lambda Cold Start Cost CalculatorInvocations, cold start rate, extra duration, and memory to the real extra monthly cost.Terraform Plan Change CounterPaste terraform plan output - add/change/destroy counts and which resources are being destroyed.Cloud Resource Naming ValidatorAWS S3, Azure (resource groups, storage, VMs, Key Vault), or GCP buckets and service accounts - one tool for every provider's naming rules.Cloud VM Cost EstimatorYour rate, schedule, and instance count - monthly/annual cost, plus savings vs always-on.
11 · Testing
7
Load Testing Capacity CalculatorConcurrent users and response time to required req/sec.Test Flakiness Rate CalculatorTotal runs and failures to a flakiness score - peaks near a 50/50 split, not a consistent failure.Test Coverage Gap CalculatorTotal lines, covered lines, and a target % to exactly how many more lines need coverage.Test Selector Robustness CheckerPaste a CSS or test selector - flagged robust, moderate, or fragile based on what breaks in CI.Test Pyramid Ratio CalculatorUnit, integration, and e2e counts - your test shape, and whether it inverted into the ice cream cone.Flaky Test CI Cost CalculatorFlake rate, retry count, and CI cost per minute - the real monthly cost flaky tests are burning.Jest Mock Reset Strategy ExplainerclearMocks vs resetMocks vs restoreMocks - what each does, cumulative not alternative.
12 · Observability
8
Log Level ReferenceTRACE through FATAL - when to use each level, an example, and production guidance.Alert Threshold CalculatorBaseline mean, std deviation, and a sigma multiplier to a statistically grounded alert threshold.PromQL Rate Query BuilderMetric, labels, range window, aggregation - a syntactically valid rate/irate/increase query.SLO Error Budget CalculatorSLO target, window, and downtime so far - your actual spendable error budget in minutes.Prometheus Alert Rule GeneratorExpression, threshold, and for-duration - a valid Prometheus alerting rule YAML.Log Query Syntax TranslatorThe same filters, translated into Kibana KQL, Datadog, and Splunk SPL syntax side by side.On-Call Burnout Sustainability CalculatorPages per week and rotation length vs industry health signals.SLA Uptime-to-Downtime ConverterUptime % to allowed downtime per day/week/month/year.
13 · Linux
8
Cron ↔ Natural Language ConverterCron syntax to plain English, and back.chmod File Permission CalculatorPick read/write/execute per owner/group/other - the numeric and symbolic chmod value.Cron to systemd Timer ConverterPaste a cron expression - the equivalent systemd OnCalendar= line for a .timer unit.Bash Strict Mode Header GeneratorPick set -e, set -u, pipefail, safe IFS, and an error trap - a commented script header.Environment Variable Naming CheckerCheck a name against portable POSIX conventions - UPPER_SNAKE_CASE, no hyphens, no leading digit.Cron Job BuilderVisual picker for the exact crontab line, plus how to install it.Backup Script GeneratorRunnable Bash or PowerShell backup script, with the cron/Task Scheduler line.systemd Service File GeneratorA complete .service file plus install instructions.
14 · Architecture
3
SemVer Bump AdvisorAdvise your next version from what changed, or compare two versions and classify the difference - major, minor, or patch.License Compatibility CheckerTwo licenses - a general compatibility note, permissive vs copyleft, one-way compatibility explained.Feature Flag Cleanup TrackerTrack flags by age, flag stale ones as review candidates.
15 · Repository Intelligence
11
Dependency Graph VisualizerPaste package.json - dependencies grouped by type, plus packages listed twice with conflicting versions.Git-History Risk ScoringPaste a real GitHub repo - bus factor and ownership risk from its actual commit history, not a paste-one-file estimate.Blast Radius ExplorerPaste a real GitHub repo, pick a file, see exactly what breaks if you change it - the real reverse-dependency graph.Dead Code FinderPaste a real GitHub repo - functions with zero known callers, traced from the real call graph.Dependency Hygiene CheckerPaste a real GitHub repo - packages imported in code but never declared in any package.json.Cargo.toml Dependency AuditorPaste Cargo.toml - every dependency listed, with wildcard or bare-major version ranges flagged.Cyclomatic Complexity CalculatorPaste one function - get its cyclomatic complexity score, the same signal behind Repository Analysis.Code Duplication DetectorPaste code - find repeated 4+ line blocks and the percentage of duplicated lines.Code Churn VisualizerPaste git log churn output - a ranked bar chart of your highest-churn files.Technical Debt "Interest Rate" EstimatorWhen does fixing it properly pay for itself?Dependency Impact Calculator for Non-Code SystemsMap blast radius for spreadsheets, processes, infrastructure.
16 · Frontend
6
Bundle Size Budget CalculatorBundle size, connection speed, and target load time - is your JS bundle within budget.CSS Specificity CalculatorPaste a CSS selector - IDs, classes, and elements broken down, plus the specificity score.Color Contrast CheckerTwo colors to the exact WCAG contrast ratio, and whether it passes AA and AAA.Core Web Vitals CheckerLCP, INP, and CLS against Google's published thresholds - Good, Needs Improvement, or Poor.React useEffect Dependency CheckerPaste a useEffect/useMemo/useCallback call - identifiers used vs declared deps, mismatches flagged.Browser Bookmarklet GeneratorA small safe preset list, turned into a draggable javascript: bookmarklet.
17 · Data & Encoding
5
JSON to TypeScript Interface GeneratorPaste a JSON sample - a TypeScript interface, nested objects broken into named interfaces.Base64 Encoder/DecoderEncode or decode Base64 with correct UTF-8 handling - emoji survive the roundtrip.JSON to CSV ConverterPaste a JSON array of objects - a proper CSV, columns are the union of keys across every row.URL Encoder/DecoderEncode or decode a URL component or a full URL - two distinct modes for two different jobs.Visual Regex BuilderCompose a regex from building blocks - pattern out, plain-English explanation.
18 · Everything else
2
© 2026 ArchSetu