atomic/dev-tools
v2.0.0 — pre-release
ToolsPrinciplesSpecSourceOpen workspace ↵
SHEET 01 / 04 — INDEX

Developer utilities,
drafted with intent.

44 single-purpose tools. No splash screens, no installs, no cookie walls. Type in the left pane → read the right pane. Keyboard-first. Browser-native. Atomic.

Open workspaceBrowse 44 tools
SHORTCUT⌘K
LOAD
< 200 ms
DEPS
0 (client-side)
TRACKING
none
LICENSE
MIT
LIVE / BASE64 ENCODERcategory · data
57 chars in/76 chars out
INPUT · A
OUTPUT · B
liveno network · 0 ms RTTOpen in workspace ↗
A — atomicdevtools.comDRAWING NO. 0001·REV. 03·SCALE 1:1
§ 02 — PRINCIPLES

Four constraints. No exceptions.

01
Instant
Each tool is a single client-side route. First paint under 200 ms. No skeletons, no shimmer.
[ verified · always-on ]
02
Atomic
One screen, one task, one canonical input. No tabs, no wizards, no upsells in the middle.
[ verified · always-on ]
03
Local
Compute runs in your browser. Your data never leaves the tab. Works offline once loaded.
[ verified · always-on ]
04
Keyboard
⌘K opens anything. Every primary action has a shortcut. Mouse is welcome but not required.
[ verified · always-on ]
§ 03 — CATALOG

44 tools, 9 categories.

AAPI & Network5 tools
API TesterTest HTTP endpoints instantlyJWT InspectorDecode and inspect JWT tokens — header, payload, expiryURL Parser & BuilderBreak down and reconstruct URLs with query parameterscURL ↔ Fetch ConverterConvert cURL commands to fetch/Axios and backCORS Preflight CheckerTest CORS configuration and check if requests are allowed
BData & Encoding8 tools
Base64 Encoder/DecoderEncode or decode text to/from Base64JSON Formatter & ValidatorPretty-print, minify, and validate JSON with error highlightingJSON ↔ YAML ConverterConvert between JSON and YAML formatsCSV ↔ JSON ConverterConvert CSV to JSON array and back with custom delimitersNumber Base ConverterConvert integers between decimal, binary, octal, and hexHash GeneratorGenerate cryptographic hashesURL Regex MatcherExtract URLs, domains, emails, and IPs from large text blocksColor Format ConverterConvert between HEX, RGB, HSL, and OKLCH with an instant visual preview
CText & Code9 tools
Format-Aware DiffCompare code with normalized whitespaceText Escape/UnescapeEncode or decode text in various formatsCode Minifier/BeautifierFormat or minify code in various languagesString Case ConverterConvert text between different case formatsRegex TesterTest regular expressions with live match highlightingMarkdown PreviewerWrite Markdown and see the rendered output side by sideLorem Ipsum GeneratorGenerate placeholder text by words, sentences, or paragraphsSVG → JSX/TSXConvert raw SVG markup into a clean React component with proper JSX attributesCSS clamp() GeneratorGenerate fluid clamp() values for responsive typography and spacing
DTime & IDs4 tools
Epoch Time ConverterConvert between human-readable dates and Unix timestampsUUID GeneratorGenerate UUIDs (v4 random or v7 timestamp-based)Cron Expression ParserTranslate cron expressions to plain English with next run timesTimezone ConverterConvert datetimes between any two IANA timezones
ESecurity4 tools
Password GeneratorGenerate strong passwords with configurable rules and entropy scoreHMAC GeneratorGenerate HMAC-SHA256/512 signatures for webhook verificationJWT Generator & SignerBuild and sign JWT tokens with HS256/HS512 for auth testingBcrypt / Argon2 GeneratorGenerate and verify bcrypt and Argon2 password hashes for auth testing
FBackend & Arch.4 tools
JSON → Type StructConvert JSON payloads to TypeScript interfaces, Go structs, or Rust structsSnowflake ID DecoderExtract timestamp, worker ID, and sequence from distributed Snowflake IDsSQL Formatter & LinterPretty-print and normalize SQL queries across different dialectsPort Checker / PingCheck if a remote port is open or ping an endpoint for reachability
GSystems & Infra4 tools
Systemd Timer GeneratorConvert cron expressions into systemd .timer and .service unit filesBitwise CalculatorVisual calculator for bit masking, shifting, and endianness swappingCIDR / Subnet CalculatorCalculate IP ranges, netmasks, and broadcast addresses from CIDR notationChmod / Permission CalculatorVisual Unix permission builder converting between octal and symbolic representations
HFFmpeg5 tools
FFmpeg Clipper & ConverterGenerate FFmpeg commands for clipping and converting videosFFmpeg Subtitle/Watermark BurnerGenerate FFmpeg commands to burn subtitles or watermarksFFmpeg Audio ExtractorGenerate FFmpeg commands to extract audio from videosFFmpeg Video Resize & ScaleGenerate FFmpeg commands to resize and scale videosFFmpeg Thumbnail ExtractorGenerate FFmpeg commands to extract frames as images
IAI & LLM1 tools
LLM Token CounterCount tokens and preview text chunks using cl100k_base before hitting APIs
§ 04 — SPEC SHEET

Constraints, in writing.

TECHNICAL SPECIFICATION · DOC-ADT-0001page 1 of 1
01FrameworkNext.js 14 — App Router
02LanguageTypeScript · strict
03StylingTailwind CSS · zero runtime CSS-in-JS
04Bundle (per tool)< 60 kB gzipped — lazy-loaded
05Cold load< 200 ms on cable broadband
06Network requests0 (excl. fonts) per tool execution
07Telemetrynone
08Cookiesnone (preferences via localStorage)
09Compute100% client-side (1 server route for TCP ping)
10LicenseMIT