Skip to main content Module math_util Copy item path Source accessibility_calc Web accessibility reference — WCAG 2.1/2.2, ARIA, keyboard nav, contrast, screen readers, testing. algo_ref_calc ansible_calc ansible_ref_calc api_design_calc API design reference — REST, OpenAPI, versioning, errors, GraphQL, rate limiting. api_gateway_calc API gateway reference — patterns, products (Kong/Envoy/Istio), auth, service mesh, observability, design. api_versioning_calc ascii_calc ASCII table reference — offline replacement for asciitable.com. ascii_table_calc auth_ref_calc awk_calc aws_ref_calc base_convert bash_adv_calc bash_ref_calc bazel_ref_calc bitwise_calc browser_dev_calc caching_ref_calc case_calc Case converter — offline replacement for textconverter.com / convertcase.net. chars_calc checksum_calc chemistry_calc chmod_calc ci_cd_adv_calc cicd_ref_calc cipher_calc cloud_cost_calc cloud_native_calc cloud_ref_calc cmake_ref_calc color_calc Color conversion and analysis — hex↔RGB↔HSL↔HSV, WCAG contrast, mix. color_convert color_names_calc combinatorics combinatorics_calc compiler_ref_calc complex_calc concurrency_ref_calc container_ref_calc cron_calc Explain and compute next run times for cron expressions — offline, instant. crypto_adv_calc crypto_ref_calc Cryptography reference — symmetric, asymmetric, hashing, PKI, vulnerabilities, protocols. css_grid_calc css_ref_calc csv_calc Preview, filter, select columns, count/sum/group-by CSV data — instant, no Python. curl_calc data_formats_calc data_pipeline_calc database_adv_calc date_calc datetime_calc db_design_calc Database design reference — normalization, indexes, transactions, distributed, NoSQL, migrations. db_internals_calc db_migrations_calc deno_ref_calc design_patterns_calc devops_ref_calc DevOps reference — CI/CD, containers/k8s, IaC, monitoring/SRE, DevSecOps. diff_calc Line and word diff — offline, instant (replaces diffchecker.com). docker_adv_calc docker_compose_calc Docker Compose reference — services, networking, volumes, health checks, production, logging. docker_ref_calc duration_calc electrical_calc encode_calc escape_calc event_driven_calc Event-driven architecture reference — pub/sub patterns, Kafka, event sourcing, CQRS, messaging, CDC, schema evolution. finance_calc find_calc fraction_calc from_roman gcd_lcm gdb_ref_calc generate_sequence geometry_calc git_adv_calc git_internals_calc git_ref_calc gitignore_calc go_adv_calc go_ref_calc graph_theory graphql_ref_calc grep_calc grpc_ref_calc hash_calc headers_calc health_calc helm_ref_calc http2_calc http_adv_calc http_calc HTTP status code lookup — offline replacement for httpstatuses.com. http_headers_calc HTTP headers reference — request, response, security, CORS, auth, caching. http_security_calc http_status_calc id_gen_calc interpolate_calc ip_calc IPv4/IPv6 address inspector and CIDR subnet calculator — offline, instant. java_ref_calc jinja_calc jq_calc js_ref_calc json_calc Format, validate, pretty-print, query, and diff JSON — instant, no model. json_path_calc jvm_ref_calc jwt_calc Decode, inspect, and validate JWT tokens — offline, instant, no cloud. k8s_adv_calc k8s_ref_calc Kubernetes reference — pods, services, config, RBAC, troubleshooting, Helm/GitOps. k8s_security_calc kafka_adv_calc kbd_calc Keyboard shortcut cheatsheets — instant offline reference for common tools.
Replaces repeated browser searches for vim / VS Code / tmux / git / bash / Windows shortcuts. kubectl_calc license_calc linux_adv_calc linux_containers_calc linux_kernel_calc linux_net_calc linux_perf_calc linux_sys_calc Linux system administration reference — systemd, processes, kernel, filesystem, network, security. load_testing_calc logic_calc lorem_calc Lorem ipsum generator — offline replacement for lipsum.com. make_calc makefile_calc markdown_calc matrix_calc message_queue_calc mime_calc MIME type ↔ file extension lookup — offline replacement for mimeTypes.io. ml_ref_calc Machine learning reference — fundamentals, models, feature engineering, training, evaluation, deployment. mobile_web_calc molecular_weight monitoring_ref_calc net_calc IPv4 network calculator — offline replacement for subnet-calculator.com / cidr.xyz. network_ref_calc networking_adv_calc nginx_calc nginx_ref_calc nix_ref_calc node_ref_calc npm_calc number_format number_theory number_theory_calc oauth2_flow_calc oauth_ref_calc observability_adv_calc observability_calc Observability reference — metrics/Prometheus, tracing/OTel, logging, SLOs, dashboards, alerting. ode_solve oop_ref_calc openapi_ref_calc openssl_calc optimize_calc otel_ref_calc percent_calc perf_ref_calc Performance engineering reference — profiling, memory, benchmarking, web vitals, DB, optimization. physical_const physics_calc port_calc postgres_calc powershell_adv_calc prime_info prob_calc prom_ref_calc protobuf_ref_calc protocols_ref_calc python_adv_calc python_data_calc python_ref_calc react_ref_calc redis_adv_calc redis_ref_calc regex_adv_calc regex_calc Test, explain, and inspect regex patterns — instant, no model, no cloud. regex_engine_calc regex_patterns_calc regex_ref_calc regex_test_calc Regex reference — anchors, groups, quantifiers, character classes, flags, common patterns. regex_viz_calc roman_info rust_adv_calc rust_async_calc rust_embedded_calc rust_macros_calc rust_patterns_calc Rust design patterns — error handling, iterators, traits, async, concurrency, design patterns. rust_ref_calc scrum_ref_calc search_ref_calc security_ref_calc security_scan_calc Security scanning reference — SAST, DAST, dependency scanning, container security, secrets, compliance. security_tools_calc sed_calc semver_calc Semantic version tools — compare, range-check, bump, sort. service_mesh_calc set_calc signal_calc simulate sort_viz spark_calc sql_adv_calc sql_fmt_calc SQL formatter / beautifier — offline replacement for sqlbeautify.com, poorsql.com. sql_ops_calc sql_ref_calc sql_tuning_calc sql_window_calc ssh_ref_calc ssl_calc stat_normal stats_calc string_dist subnet_calc svelte_ref_calc symbolic_calc systemd_adv_calc systemd_calc table_calc ASCII table renderer — offline replacement for tableconvert.com. tar_calc template_calc terminal_tools_calc terraform_adv_calc Advanced Terraform reference — modules, state, workspaces, testing, patterns, CI/CD. terraform_calc testing_ref_calc text_stats timestamp_calc Unix timestamp converter — offline replacement for epoch.now.sh / unixtimestamp.com. tmux_calc to_roman toml_calc TOML validator — offline replacement for toml-lint.com / taplo.tamasfe.dev.
Pure-Rust well-formedness check; no toml crate required. toolkit_catalog trig_calc truth_table ts_patterns_calc ts_ref_calc typescript_adv_calc tz_calc unicode_ref_calc unit_convert units_calc url_calc Parse, encode, decode, and build URLs — offline, instant, no cloud. uuid_calc Generate and decode UUIDs — offline, instant. valgrind_ref_calc validate_calc vector_calc vim_adv_calc vim_calc vue_ref_calc wasm_ref_calc WebAssembly reference — WAT format, memory model, WASI, wasm-pack, wabt, component model. wasm_runtime_calc web_apis_calc web_perf_calc xml_calc XML validator and formatter — offline replacement for xmlvalidator.com / xmlformatter.com.
Pure-Rust well-formedness checker (no XML crate required). yaml_calc YAML validator, formatter, and key inspector — offline replacement for yamllint.com. zig_ref_calc