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Observability 6

  • Observability fig. 01

    AlertLint

    Unit testing for Grafana Loki alert rules.

    Test your Loki alerting and recording rules before they fire in production. Paste rules + synthetic logs, assert pass/fail — entirely in the browser. The promtool equivalent Loki never had.

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  • Observability fig. 08

    LogQL ↔ PromQL Helper

    Translate and explain queries between Loki LogQL and Prometheus PromQL.

    Convert common metric-query shapes between Grafana Loki LogQL and Prometheus PromQL, with notes on what does and does not map.

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  • Observability fig. 09

    PromQL Explainer

    Paste a PromQL query and get a plain-English explanation.

    Break down a Prometheus PromQL query into a readable explanation — selectors, rates, aggregations, functions and comparisons.

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  • Observability fig. 24

    Prometheus Relabel Tester

    Test Prometheus relabel_configs against sample labels and see exactly what survives.

    A free prometheus relabel tester that runs your relabel_configs against sample target labels to show exactly which labels survive, get rewritten, or cause a target to be dropped. Supports replace, keep, drop, labelmap, hashmod and more — pure client-side, no signup.

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  • Observability fig. 25

    Alertmanager Route Tester

    Walk your Alertmanager route tree against alert labels to find the matching receiver(s) - in your browser.

    A free alertmanager route tester that walks your Alertmanager route tree against a sample alert’s labels to find the matching receiver(s), the matched route path, continue behaviour and grouping. Runs in your browser with no signup — no amtool required.

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  • Observability fig. 36

    Grafana Dashboard Validator

    Lint Grafana dashboard JSON for broken variables, legacy panels and import traps — in your browser.

    Paste a dashboard JSON and read every import trap with the JSON path it lives at: template variables nothing declares, ${DS_…} placeholders Grafana cannot resolve, Angular panels that render nothing on Grafana 12, duplicate panel ids, invisible panels and a schemaVersion older than the file looks. 22 rules pinned to a stated Grafana version, entirely client-side.

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Sicherheit 5

  • Security fig. 02

    CVE-Ignore Converter

    Translate .trivyignore / .grype.yaml / .snyk in one click.

    Convert and unify a single vulnerability-suppression policy across Trivy, Grype, Snyk and osv-scanner formats.

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  • Security fig. 16

    JWT Decoder & Encoder

    Decode, verify, and sign JWTs — HS/RS/PS/ES/EdDSA — with a built-in key generator.

    Paste a JSON Web Token to decode its header and claims, verify its signature against a secret, PEM, JWK, or JWKS, sign new tokens with any JWS algorithm, and generate test keys — all in your browser. Nothing leaves the page.

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  • Security fig. 19

    Hash Generator

    Compute MD5, SHA-1, SHA-256 and SHA-512 digests of any text — plus HMAC.

    Paste text and get its MD5, SHA-1, SHA-256 and SHA-512 hashes at once, plus an optional HMAC with a key — computed in your browser with the Web Crypto API.

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  • Security fig. 35

    Certificate Decoder & Chain Checker

    Decode PEM certificates, check chain order, and verify signatures — in your browser.

    Paste a certificate or a whole chain and read every X.509 field, see the chain order corrected with the reason it was wrong, and get a real signature verdict on each link — verified, failed, or not-checked with the algorithm named. Hand-rolled DER parser, Web Crypto verification, zero uploads.

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  • Security fig. 42

    AWS IAM Policy Generator

    Build least-privilege IAM and S3 bucket policies — JSON and Terraform, with size limits and warnings.

    Pick a service, actions and resources and get a valid IAM identity policy or S3 bucket policy as JSON and as a Terraform aws_iam_policy_document, with ARN templates from the AWS Service Reference, condition operators, the policy size checked against AWS quotas, and warnings for wildcard actions, Resource "*" and Principal "*".

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CI/CD 3

  • CI/CD fig. 03

    GitHub Actions Validator

    Check workflow YAML errors & security issues online — no install.

    Paste a GitHub Actions workflow and get YAML errors plus security-misconfiguration checks, instantly, with nothing to install.

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  • CI/CD fig. 21

    GitHub Actions Expression Tester

    Evaluate ${{ }} expressions and simulate workflow triggers.

    Test GitHub Actions if: conditions with GitHub’s exact coercion rules, catch the “always true” literal footgun, and simulate which jobs run for a push, PR or tag.

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  • CI/CD fig. 23

    GitLab CI Validator

    Lint .gitlab-ci.yml for YAML errors and pipeline misconfigurations — in your browser, no login.

    A free gitlab ci validator that lints your .gitlab-ci.yml for YAML errors plus structural and pipeline misconfigurations — undefined stages, jobs without scripts, bad rules / needs / extends. Runs entirely in your browser, no login.

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Zeitplanung 3

  • Scheduling fig. 04

    Cron Expression Tester

    Explain any cron expression in plain English — and see the next runs.

    Paste a cron expression and get a plain-English description plus the next run times. Supports ranges, steps, lists and @macros.

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  • Scheduling fig. 05

    Cron to systemd Converter

    Turn a crontab line into a systemd timer + service unit.

    Convert a crontab entry into an equivalent systemd .timer and .service unit, with an OnCalendar expression and migration notes.

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  • Scheduling fig. 38

    Systemd Unit Validator

    Lint .service, .timer and .socket files for typos and misconfigurations — in your browser, no root.

    Paste a unit file and get line-numbered findings: a directive in the wrong section, a typo systemd silently ignores, an OnCalendar= that never fires, Restart= that stops the unit loading at all. Every finding says what systemd itself does about it, and carries the fix. No systemd, no root, no upload.

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Logs 2

  • Logs fig. 06

    Regex Log Tester

    Test regular expressions against your log lines — live matches and groups.

    Paste a regex and sample log lines, see live matches, capture groups and named groups. Built for log parsing, runs entirely in your browser.

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  • Logs fig. 34

    jq Playground

    Test jq expressions against your JSON — real jq 1.8.2 running in your browser.

    Run the real jq 1.8.2 binary, compiled to WebAssembly, against your own JSON — no server round-trip, no upload, and no re-implementation that "mostly" matches. One card per output, honest compile/runtime/parse-error classification, and -r/-s/-n/-c as one-tap toggles.

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Config 1

  • Config fig. 07

    Env Example Checker

    Find env vars your code uses but .env.example is missing.

    Paste your code and your .env.example to find environment variables used in code but missing from the example (and unused keys).

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Netzwerk 6

  • Networking fig. 10

    Subnet Calculator

    Network, broadcast, mask and host range from any IPv4/IPv6 CIDR.

    Enter an IPv4 or IPv6 address with a prefix and get the network and broadcast addresses, netmask, wildcard, usable host range and address counts.

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  • Networking fig. 11

    IP Address Converter

    Convert an IP between dotted decimal, integer, hex and binary.

    Paste an IPv4 or IPv6 address in any form — dotted decimal, integer, hexadecimal or binary — and see every representation at once.

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  • Networking fig. 12

    CIDR / Subnet Checker

    Check an IP against CIDR ranges, find overlaps, and merge lists.

    Paste an IP plus CIDRs — or a whole list — to check membership, spot overlapping or contained ranges, and get the minimal covering set.

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  • Networking fig. 13

    MAC Address Formatter

    Reformat a MAC across colon, hyphen, Cisco and bare — and read its bits.

    Paste a MAC address and get it normalised across colon, hyphen, Cisco dotted and bare forms, plus the U/L and I/G bit meaning, OUI and the EUI-64 IPv6 link-local address it derives.

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  • Networking fig. 14

    Reverse DNS / PTR Helper

    Build the in-addr.arpa / ip6.arpa PTR name and reverse zone for any IP.

    Enter an IPv4 or IPv6 address or CIDR and get the in-addr.arpa or ip6.arpa PTR name, the matching reverse zone and the nibble breakdown behind it.

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  • Networking fig. 15

    Subnet Splitter

    Split a parent CIDR into subnets and find the free space around allocations.

    Split a parent IPv4 or IPv6 CIDR into equal subnets or carve it up with VLSM, then list existing allocations to find the gaps and the next available subnet.

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Kodierung 4

  • Encoding fig. 17

    Timestamp Converter

    Convert between Unix epoch, ISO 8601 and human-readable dates.

    Paste a Unix timestamp in seconds or milliseconds, or an ISO 8601 date, and convert it across epoch, UTC and local time with relative age.

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  • Encoding fig. 18

    Base64 Encoder / Decoder

    Encode and decode Base64 and URL-safe Base64, with Unicode support.

    Paste text or Base64 to encode or decode in either direction, with standard and URL-safe alphabets and full UTF-8 handling.

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  • Encoding fig. 30

    JSON ↔ YAML Converter

    Convert JSON to YAML and back — with honest warnings about what changes.

    Convert JSON to YAML or YAML to JSON with a real YAML 1.2 parser, and see every comment, anchor, merge key, timestamp and out-of-range integer the conversion costs you. Catches the "Norway problem" in both directions.

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  • Encoding fig. 31

    URL Encoder / Decoder

    Percent-encode, decode, and parse query strings — with per-component RFC 3986 rules.

    Percent-encode a value for the position it actually lands in, decode one that came back mangled, or split a whole URL into its components and a decoded query-parameter table. Double-encoding, + vs %20, punycode hosts and repeated keys are named, not guessed.

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Kubernetes 2

  • Kubernetes fig. 20

    Kubernetes Resource Calculator

    Total CPU and memory requests and limits across pods and replicas.

    Enter container CPU and memory requests and limits with replica counts to total the resources a workload reserves, and convert millicores and Mi/Gi units.

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  • Kubernetes fig. 37

    Kubernetes Label Selector Tester

    See which pods a label selector matches — and why each one does or doesn’t.

    Paste your pods and a selector — a kubectl -l string or a matchLabels/matchExpressions block — and get a per-resource MATCH or NO MATCH with the exact clause that decided, including the case everyone answers backwards: NotIn and != match a resource that has no such label at all.

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Docker 2

  • Docker fig. 22

    Docker Run to Compose

    Paste a docker run command, get a docker-compose service YAML — and convert back, all in your browser.

    A free docker run to docker compose converter that turns a docker run command into the equivalent docker-compose service YAML — and converts a Compose service back to a docker run line. Bidirectional, runs entirely client-side, no signup.

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  • Docker fig. 33

    Dockerfile Linter

    Paste a Dockerfile, get line-numbered best-practice and security findings with fixes — entirely in your browser.

    Seventeen high-signal rules over a real Dockerfile parse: unpinned base images, the apt-get update cache trap, secrets baked into image history, root containers, broken JSON exec forms and layer-cache order. Line-numbered findings with a fix for each, and a list of what it deliberately does not flag.

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Werkzeuge 5

  • Utilities fig. 26

    UUID / ULID Generator

    Generate v4 UUIDs and ULIDs, or inspect one.

    Generate cryptographically random v4 UUIDs and lexicographically sortable ULIDs in bulk, or paste an identifier to decode its version, variant and embedded timestamp — all in the browser.

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  • Utilities fig. 27

    Case Converter

    Convert text between camelCase, snake_case, kebab-case and more.

    Convert any string between camelCase, PascalCase, snake_case, SCREAMING_SNAKE_CASE, kebab-case, Title Case and more at once — copy the one you need. Unicode-aware, entirely client-side.

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  • Utilities fig. 28

    Slugify

    Turn any title into a clean URL slug.

    Turn titles and headings into clean, URL-safe slugs: strips accents and diacritics, collapses separators and enforces a max length. Configurable separator, all in the browser.

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  • Utilities fig. 29

    chmod Calculator

    Convert chmod between octal, symbolic and the permission matrix.

    Convert Unix file permissions between octal (755), symbolic (rwxr-xr-x) and a checkbox matrix — including setuid, setgid and the sticky bit — and copy the exact chmod command.

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  • Utilities fig. 32

    Data Size Converter

    GiB vs GB, bits vs bytes — and how long that transfer really takes.

    Convert data sizes between SI (kB, MB, GB) and IEC (KiB, MiB, GiB) units with exact BigInt maths, tell bits from bytes without guessing, and get the transfer time for any link speed.

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IaC 1

  • IaC fig. 39

    Terraform Plan Summarizer

    Paste terraform plan output, get a summary of adds, changes, destroys and replacements.

    Read a 5,000-line plan in five seconds: adds, changes, destroys and replacements counted separately, the attributes that force a replacement named, and every destructive action on a database, NAT gateway or cluster control plane pulled to the top. Both plan formats, and the totals cross-checked against Terraform's own summary line — nothing leaves your browser.

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AI 2

  • AI fig. 40

    LLM VRAM Calculator

    Estimate the GPU memory a local LLM needs — weights, KV cache and runtime overhead, per quantization and context length.

    Pick a model preset or type a parameter count, choose a GGUF quantization and a context length, and get the VRAM in GiB split into weights, KV cache and runtime overhead — with a verdict against 8, 12, 16, 24, 32, 48 and 80 GiB cards. Real per-layer KV-cache math from each model's config.json, not a rule of thumb.

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  • AI fig. 41

    LLM Token Counter

    Count GPT tokens offline — o200k_base and cl100k_base, with the exact token boundaries.

    Paste a prompt or a document and count its tokens with the real OpenAI BPE encodings — o200k_base (GPT-5, GPT-4.1, GPT-4o and the o-series) or cl100k_base (GPT-4, GPT-3.5 and text-embedding-3) — with every token boundary highlighted, character and word counts, and an optional cost estimate at your own price per million tokens.

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