Tools
A browser-native workbench for SRE, observability, and system-design work — grouped intoBuild,Observe,Operate, andFocus. Everything runs in your browser and persists locally — no account, no server.
BUILD
Format, decode, generate, and diff — the inner-loop developer utilities.
Base64 / Hash Toolkit
UTF-8 safe Base64 encode/decode plus SHA-1/256/384/512 hashing.
Cron Builder
Validate a cron expression, get a plain-English description, and preview next run times.
Diff Tool
Line-by-line text diff with whitespace and case options, exported as a unified diff.
HTTP Header Inspector
Parse pasted response headers and check for common security headers.
JSON / YAML Toolkit
Convert between JSON and YAML, format, and minify — all client-side.
JWT Inspector
Decode a JWT header and payload and check expiry. Decode only — no signature verification.
Log Explorer
Paste raw logs, then parse, filter, group, and search them entirely in your browser.
Regex Playground
Test a regular expression against sample text with live match highlighting and capture groups.
SQL Formatter
Format or minify SQL for Postgres, MySQL, T-SQL, BigQuery, and SQLite.
Timestamp Converter
Convert between Unix time and ISO 8601, format in any timezone, and show relative time.
Unix Permissions Calculator
Convert between octal and symbolic file permissions, including setuid/setgid/sticky bits.
URL Toolkit
Encode and decode URL components, and parse or build query strings.
UUID Generator
Generate v4 UUIDs in bulk, or parse and validate an existing UUID.
OBSERVE
SLOs, cardinality, telemetry cost, and query builders for metrics and logs.
Capacity Estimator
Turn DAU, request rate, and a peak multiplier into QPS, storage, bandwidth, and server count.
Cardinality Calculator
Estimate active series from a label set, flag high-cardinality labels, and rate the risk.
CIDR Calculator
Network/broadcast address, subnet mask, and usable host range for an IPv4 CIDR block.
LogQL Builder
Assemble a LogQL query from stream matchers, line filters, and a parser stage.
Metric Naming Validator
Check a metric name against Prometheus or OpenTelemetry naming conventions.
OTel Attribute Explorer
Classify OpenTelemetry attributes by scope and flag the ones unsafe as metric labels.
PromQL Playground
Build and explain PromQL with templates, a function reference, and best-effort linting — no backend.
SRE Calculator
SLO error budgets, burn rate, Apdex, and MTTR/MTBF calculators.
Telemetry Economics
Model metric, log, and trace volume from fleet size and estimate the cost drivers.
OPERATE
Incident timelines, runbooks, post-mortems, decision records, and diagrams.
ADR Builder
Structured Architecture Decision Record editor with Mermaid diagram preview.
Azure Resource Naming
Generate Azure resource names from a configurable Cloud Adoption Framework convention.
Incident Timeline Builder
Turn a list of timestamped events into a visual incident timeline.
Mermaid Playground
Edit Mermaid diagrams with a live preview, template library, and SVG export.
Postmortem Builder
Fill in a structured incident postmortem and export it as Markdown.
Runbook Builder
Draft an alert runbook — symptoms, checks, decision points, remediation — and export Markdown.
FOCUS
Personal workspaces — journal, clipboard, cockpit, timer, and scratchpad.
Digital Bullet Journal
Rapid-log capture using a compact symbol notation, parsed into a daily rollup.
Engineer Clipboard
Searchable personal snippet library — kubectl, az, docker, PromQL, KQL, SQL, regex.
Engineering Cockpit
A single daily dashboard — top 3, schedule, quick capture, waiting-on, and real learning progress from your flashcards.
Pomodoro Timer
A focus timer with ambient sound, session history, streak tracking, and achievements.
Scratchpad
A tabbed, auto-saving local workspace for throwaway notes, JSON, logs, and SQL.