Free tools for people who run production.

Reliability & SLOs

Targets, budgets and what downtime costs

• SLO & error budget calculator: Turn an availability target into allowed downtime and failed requests.
• Burn-rate alert planner: Multi-window burn-rate alerts that page early and stay quiet.
• Uptime nines converter: Downtime to availability and back, per day, month and year.
• Composite SLA calculator: The real availability of services that depend on each other.
• Latency percentile calculator: Paste durations and get p50, p90, p95, p99 and a histogram.
• Apdex score calculator: User satisfaction from response times and a target threshold.
• Downtime cost calculator: What an outage or a slow checkout costs per minute.
• MTTR, MTTD & MTBF calculator: Incident timings into the numbers your reviews track.

OpenTelemetry & tracing

Headers, setup and payloads

• Traceparent parser & generator: Read, validate and create W3C traceparent and tracestate headers.
• OpenTelemetry setup generator: Install steps, environment variables and code for your stack.
• Collector config builder: Build an OpenTelemetry Collector YAML from receivers to exporters.
• OTLP JSON validator: Check an OTLP payload and see its spans, logs or metrics.
• Semantic conventions lookup: Find the standard attribute name for what you want to record.
• Trace & span ID generator: Valid random trace IDs and span IDs for tests and fixtures.
• Sampling calculator: How much you keep and save at a given sampling rate.
• Baggage header tool: Encode and decode W3C baggage, with size limits checked.

Business & product

What reliability and speed are worth

• Speed vs revenue calculator: What each extra 100 ms of page or checkout time costs in conversions.
• Observability ROI calculator: Hours and revenue saved by finding and fixing problems faster.
• SLA credit calculator: Service credits you owe, or are owed, after a breach.
• Funnel drop-off calculator: Where customers leave each step, and what recovering them is worth.
• A/B test significance calculator: Whether a change really moved conversion, with sample sizes.
• SaaS metrics calculator: MRR, churn, LTV, CAC and payback from a few numbers.
• Cloud cost estimator: Monthly compute, storage and transfer for a workload.
• On-call cost calculator: Pager load, hours and payments across a rotation.
• Churn from errors estimator: Customers likely lost to failed sessions, and their value.
• Build vs buy calculator: Running your own observability stack against a service, over three years.

Cost & capacity

Volume, cardinality and storage

• Telemetry cost estimator: Daily volume, storage and the plan that fits, from your traffic.
• Log volume estimator: Log lines and sizes into GB per day and per month.
• Metric cardinality calculator: How many series your labels really create.
• Retention & storage calculator: Disk needed for a retention period, with compression.
• Data transfer estimator: Bandwidth and egress for sending telemetry out.

Logs & debugging

Parse, format and convert

• Log pattern tester: Test parsing patterns against real log lines and see the fields.
• JSON formatter & validator: Pretty-print, minify and find the error in JSON.
• Timestamp converter: Unix seconds, milliseconds and nanoseconds to dates, any time zone.
• Duration converter: Nanoseconds to hours, and ISO 8601 durations explained.
• Stack trace formatter: Make a one-line stack trace readable again.
• HTTP status code reference: Every status code, what it means and when to retry.
• User-agent parser: Browser, OS and device from a user-agent string.

Developer utilities

The everyday tools, done properly

• Regex tester: Test patterns live with matches, groups and a plain-language explanation.
• Diff checker: Compare two texts or JSON documents side by side.
• YAML ⇄ JSON converter: Convert both ways and find the line that breaks.
• cURL to code converter: Turn a cURL command into C#, JavaScript, Python or Go.
• SQL formatter: Format and read long queries, ClickHouse and Postgres included.
• CIDR & subnet calculator: Address ranges, masks and host counts.
• Capacity planner: Instances, threads and pool sizes from traffic and latency, using Little’s law.
• Load test planner: Virtual users and ramp-up for a target requests per second.
• Kubernetes resources calculator: Requests, limits and nodes for your pods.
• Semantic version checker: Test versions against ranges like ^1.2 and ~3.0.
• Environment file checker: Find duplicates, missing values and secrets in a .env file.
• Unit converter for engineers: Bytes to GiB, bits per second, and rates per minute or hour.

Security & encoding

Decode and hash, locally

• JWT decoder: Read a token’s header, claims and expiry without sending it anywhere.
• Hash generator: SHA-256, SHA-1 and MD5 of text, computed locally.
• Base64 & URL encoder: Encode and decode Base64, Base64URL and URL text.
• UUID & ULID tool: Generate UUIDv4, UUIDv7 and ULIDs, and read the time inside.

Web performance & schedules

Vitals, timeouts and cron

• Core Web Vitals checker: Grade LCP, INP and CLS against Google’s thresholds.
• Cron expression explainer: A cron schedule in plain words, with its next runs.
• Rate limit calculator: Requests per window, burst sizes and retry timing.
• Timeout & retry planner: Timeouts and backoff that add up across a call chain.

When a calculator isn't enough

PowerTraces measures your real error budgets, latency, costs and attacks from the telemetry you already send.

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