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What's New on CacheSleuth

A summary of what changed in the redesign, including new tools, dark mode, and translation support.

The Big Picture

Site-wide improvements that apply to every page.

Mobile-first and responsive

Every page works at phone widths first and scales up to desktop. The desktop sidebar is sticky on the left, and the mobile drawer slides out on demand.

Dark mode

Every tool, panel, and code table now has a proper dark theme. The site follows your system preference by default, and you can toggle it manually from the header.

Faster everything

Pages are served as static HTML, and each tool only loads the JavaScript and CSS it actually needs.

Findable tools

Tools are re-categorized and tagged with keywords. The homepage search bar finds them by name, cipher, or description. You can also paste coordinates directly into it!

Quality of Life

Smaller refinements throughout the site.

Tools & Upgrades

Every tool was individually re-thought during the redesign with the goal of making it the best version of itself, and every tool now ships with worked Examples built in, which the old site did not have. On top of that, the redesign added a stack of brand-new tools, including codes broken out of the Multi Decoder into their own pages. The flagship tools come first, followed by everything new since the old site, then the upgrades to tools that carried over.

  • Multi Decoder

    Rewritten from the ground up. Paste cipher text and the decoder runs every supported code at once, with separate slots for keywords, alphabets, and number sequences. Results are now ranked so the most likely "possible words" float to the top, and a filter lets you hide every section that did not produce a result. There is also a Share button that builds a link with your exact input and settings baked in, so you can hand it to someone else and they land on the same view. The list of supported ciphers is added to periodically.

  • Wherigo Solver

    Drop a .gwc cartridge and the solver decompiles the Lua code, scans the zone data, and ranks the most likely final coordinates with a confidence score. Reverse Wherigo presets for the Waldmeister and day1976 cartridge formats are included.

  • Multi Encoder

    Brand new for the redesign. Type a plaintext message, optionally provide keywords or a custom alphabet, and the encoder produces every supported cipher, code, and number-base representation at once. Output is grouped by family with a search filter, copy button per row, and a Share Link that round-trips back through the Multi Decoder.

  • Cipher Identifier

    Brand new for the redesign. Paste an unknown ciphertext and the identifier scores it against the full cipher catalog, surfaces the most likely candidates, and offers a one-click jump to the matching tool with your text already loaded. It also spots structural giveaways like Morse, Morbit, base conversions, and cryptarithm equations.

  • Code Identifier

    Brand new for the redesign. Upload a photo of an unknown symbol alphabet, like pigpen, Dancing Men, or alien glyphs, and it matches the shapes against its catalog of symbol codes to tell you which alphabet a puzzle is using.

  • Geocache Viewer

    Multiple input methods are supported: drop a saved cache page, paste the raw HTML, or use one of the browser extensions or bookmarklets that send the page directly from geocaching.com into the viewer. The viewer reformats the page into a cleaner layout and surfaces details that the live site does not show. Everything runs in your browser.

  • Coordinate Converter

    Converts between DD, DDM, DMS, UTM, MGRS, Plus Code, Maidenhead, Geohash, GeoHex, Geo3x3, NAC, Mapcode, OSGB, Mercator, and both Reverse Wherigo formats (Waldmeister and day1976) at the same time. Includes elevation lookup, a map view, and one-click links out to Google Maps, OpenStreetMap and other mapping services. The converter also runs as an embeddable iframe on other pages so you can get full coordinate conversion functionality in multiple places.

  • Codes & Symbols

    Over 318 code tables, most of them interactive so you can type your own message and see every variant render at once. Filter by name, or pick "Show All Codes" to render a single phrase across every monoalphabetic code on one page, which is useful for figuring out which code a puzzle is using.

  • Geocaching Quick Search

    A new homepage card and a dedicated sidebar mode let you jump to a cache page, log a find as any log type, look up a user's profile, hides, trackables, or stats, search FTF or recently published caches by region, or open your own dashboard.

  • Code Image Decoder

    Upload a picture of a message written in a symbol alphabet, like pigpen, braille, or other glyph codes, and the decoder finds each glyph, identifies the family, matches every symbol against its reference set, and reads the whole thing back into letters. It checks the result against a dictionary and coordinate patterns to flag a likely answer.

  • Cryptogram Solver

    Paste a monoalphabetic substitution (Aristocrat or Patristocrat) and the solver runs a hill-climb against an English quadgram model to recover the most likely plaintext, with runner-ups. It auto-detects Caesar shifts, Atbash, and keyword alphabets, and you can lock known letters or whole words to refine the result. It is also available as an optional toggle inside both Multi Decoders.

  • Anagram Solver

    Enter letters, a word, or a phrase and the solver finds every dictionary word and multi-word phrase that uses them, with Scrabble and Words With Friends tile scoring and crossword-style pattern filters. Switch between a readable common-words list and a 235,000-word full dictionary, and filter by length or a word that must appear.

Brand-new tools

Over 117 new tools, grouped by theme and sorted newest first. Tap a group to expand it.

Puzzle & logic solvers 21 tools
  • Binairo Jun 2026
    Solve a Binairo/Takuzu puzzle of 0s and 1s from its given cells.
  • Bridges Jun 2026
    Solve a Bridges/Hashiwokakero puzzle of islands and bridges.
  • Futoshiki Jun 2026
    Solve a Futoshiki puzzle from its given digits and inequality signs.
  • Heyawake Jun 2026
    Solve a Heyawake puzzle from its rooms and black-cell counts.
  • Hitori Jun 2026
    Solve a Hitori puzzle by finding which numbered cells to shade.
  • Kakuro Jun 2026
    Solve a Kakuro/cross-sums puzzle from its run clues.
  • KenKen Jun 2026
    Solve a KenKen or Mathdoku puzzle from its cages and target numbers.
  • Light Up Jun 2026
    Solve a Light Up/Akari puzzle by placing the bulbs.
  • Magic Square Jun 2026
    Complete a magic square so every row, column, and diagonal share one sum.
  • Crack a Mastermind code from known guesses and peg feedback.
  • Masyu Jun 2026
    Solve a Masyu puzzle by drawing its single closed loop through the pearls.
  • Numberlink Jun 2026
    Solve a Numberlink puzzle by connecting each pair of numbers.
  • Nurikabe Jun 2026
    Solve a Nurikabe puzzle by shading the sea around its islands.
  • SET Solver Jun 2026
    Find every valid set on a board of SET cards.
  • Skyscrapers Jun 2026
    Solve a Skyscrapers puzzle from its edge clues and any given heights.
  • Slitherlink Jun 2026
    Solve a Slitherlink puzzle by drawing its single closed loop.
  • Logical Solver Jun 2026
    Solve logic grid puzzles with automatic deduction.
  • Game of Life Jun 2026
    Interactive Conway's Game of Life grid with drawing, stepping, play controls, wrapping, and classic presets.
  • Nonogram Solver Jun 2026
    Solves picross and griddler puzzles from row and column clues, with logic propagation and search fallback.
  • Number Pyramid Jun 2026
    Fills missing blocks in additive number pyramids where each block is the sum of the two below it.
  • Tower of Hanoi Jun 2026
    Generates the optimal move sequence for any disk count and animates the solution step by step.
Word, anagram & text tools 7 tools
  • Hides words inside monospace text that float into view when you relax your eyes.
  • Scrabble Scorer Jun 2026
    Scores a known Scrabble or Words With Friends play with premium squares, blanks, and bingo bonus support.
  • Word Search Jun 2026
    Generates word search grids from your list or solves a pasted grid by finding every hidden word.
  • Wordoku Jun 2026
    Solves nine-letter sudoku grids and lists rows and diagonals so hidden themed words are easier to spot.
  • Adds stacked combining marks for glitch text and strips them back out again.
  • Converts text to phonetic spelling-alphabet code words.
  • Upside-Down Text Apr 2026
    Rotates text 180 degrees with Unicode look-alike characters and can unflip it back.
Ciphers & secret writing 14 tools
  • Spam Mimic Jun 2026
    Hides a short message inside fake junk mail, a fake PGP block, or invisible whitespace.
  • Decodes and encodes the DDR substitution table for letters, digits, and punctuation.
  • Encodes and decodes the WWII Type One alphabet that maps letters to Navajo words.
  • RSA Jun 2026
    Small-key BigInt RSA demo for puzzle use, with key generation, number encryption, and text encryption.
  • Decode page, line, word, and character references against a source text.
  • Homophonic substitution where each letter can be written with several different number tokens.
  • Solves alphametic puzzles like SEND + MORE = MONEY, including comparison operators and extra conditions.
  • Grandpré May 2026
    Homophonic cipher on a configurable 10x10 letter grid, where repeated letters give several valid coordinate pairs.
  • Morbit May 2026
    Encodes plaintext as Morse, reads the symbol stream in pairs, and maps each pair to a digit from a 9-position key.
  • Spirit DVD Code May 2026
    Encodes and decodes the line-and-dash message from the Mars rover Spirit DVD.
  • AMSCO Cipher Apr 2026
    Encodes and decodes the incomplete columnar transposition that alternates single letters and pairs.
  • Ragbaby Cipher Apr 2026
    Solves the keyed substitution cipher that shifts each letter by its running position across the words.
  • RC4 Cipher Apr 2026
    Educational stream-cipher tool that XORs text with a key-derived keystream and outputs text, hex, or Base64.
  • Solitaire Cipher Apr 2026
    Implements Bruce Schneier's Pontifex cipher, where a deck of cards generates the keystream.
Numbers, dates & converters 32 tools
  • Amicable Numbers Jun 2026
    Find a number's amicable partner where each equals the sum of the other's proper divisors, and list every amicable pair up to a limit.
  • Check if a number equals the sum of its digits each raised to the digit count, and list every Armstrong number up to a limit.
  • Check if a number's square ends in the number itself, with the matching tail highlighted, and list every automorphic number up to a limit.
  • Catalan Numbers Jun 2026
    Catalan numbers via arbitrary precision: generate the first terms, look up C(n), or test whether a number is Catalan.
  • Trace any number's Collatz hailstone sequence, step count, and peak, or find the most stubborn starter up to a limit.
  • Factorions Jun 2026
    Sum the factorials of a number's digits repeatedly to see if it is a factorion, reaches one, or enters a cycle.
  • Figurate Numbers Jun 2026
    Triangular, square, pentagonal, hexagonal, and tetrahedral numbers: generate, look up a term, or test membership.
  • Happy Numbers Jun 2026
    Tests whether a number is happy by showing its full digit-square chain, and lists every happy number up to a limit.
  • Check if a number is divisible by the sum of its digits, see the quotient, and list every Harshad number up to a limit.
  • Run Kaprekar's routine to 6174 or 495 with the full chain, and check or list Kaprekar numbers.
  • Reverse-and-add any number to a palindrome and see the chain and iteration count, or flag it as a Lychrel candidate.
  • Mersenne Numbers Jun 2026
    Mersenne numbers (2 to the n, minus 1) with prime flagging: generate, look up M(n), or test for one less than a power of two.
  • Classify a number as perfect, abundant, or deficient by the sum of its proper divisors, and list every perfect number up to a limit.
  • Pronic numbers n(n+1): generate the first terms, look up P(n), or test whether a number is the product of two consecutive integers.
  • BCD Code Jun 2026
    Converts decimal digits to and from Binary-Coded Decimal.
  • Converts between decimal and the D'ni base-25 number system.
  • Date Calculation Jun 2026
    Adds or subtracts calendar time from a date.
  • Date Difference Jun 2026
    Counts the number of days between two dates.
  • Day of the Week Jun 2026
    Finds the weekday for any Gregorian calendar date.
  • Translates DNA and RNA codons into amino acids.
  • Converts between calendar dates and Julian Day numbers.
  • Converts between dates and day numbers within a year.
  • Number Cruncher Jun 2026
    Analyze a single integer for bases, factors, primality, and special-number properties, then run related BigInt worksheet expressions with variables.
  • Converts decimal numbers to and from base-60 cuneiform tens and units wedges.
  • Draws and reads the medieval monastic numeral glyphs that encode 0 to 9999 in one mark.
  • Gray Code Jun 2026
    Converts between decimal, standard binary, and reflected binary Gray code.
  • Maya Numbers Jun 2026
    Converts between decimal values and Maya base-20 dot, bar, and shell numerals.
  • Calculate with very large integers in decimal, hex, octal, or binary.
  • Time Decimal May 2026
    Converts times of day to seconds since midnight and percent of day elapsed, for coordinate-from-time puzzles.
  • Plots the bitmap for any k value, and goes the other way: draw a bitmap and it finds the k that draws it.
  • Turns words into upside-down calculator numbers, or flips a number to read the hidden word.
  • Punycode Apr 2026
    Converts Unicode domain names to and from the ASCII Punycode labels used by IDNA.
Coordinate, map & geocaching tools 17 tools
  • Calculates how far away the horizon is from a given height.
  • One search box that recognizes airline, airport, callsign, flight, aircraft, runway, registration, ICAO 24-bit, UN/LOCODE, railroad, and shipping codes, then explains each and links related identifiers.
  • Finds the geographic center of any list of coordinates with a 3D cartesian average.
  • Averages multiple GPS readings of one spot into a single best-estimate coordinate and reports the spread.
  • Formula Solver Jun 2026
    Evaluates puzzle formulas with letter variables, ranges, cross sums, word values, trig, roots, constants, and references between formulas.
  • Geohashing Jun 2026
    Computes the xkcd geohash point from a date, graticule, and Dow Jones opening value, then plots it on a map.
  • Finds the area, perimeter, and center of gravity of any polygon.
  • Rhumb Line Jun 2026
    Calculates the constant-bearing course and distance between two coordinates, alongside the great-circle comparison.
  • Segment a Line Jun 2026
    Divides the path between two coordinates into equal segments and lists each intermediate point.
  • Expands coordinate formulas with variable ranges, parses every candidate, maps the results, and exports the list.
  • Antipode Finder May 2026
    Finds the point on the exact opposite side of the Earth from any coordinate.
  • Design and print your own geocache log sheets and log rolls, entirely in your browser.
  • Geoart Builder May 2026
    Builds paired posted and final coordinates for geocache geoart layouts.
  • Datum Transform Apr 2026
    Converts coordinates between geodetic datums and ellipsoids with Helmert transformations.
  • Decodes or builds the 11-character Multi Location Maze Wherigo code.
  • Drops a perpendicular from a point onto a line and reports the nearest point, cross-track distance, and along-track distance.
  • Resection Apr 2026
    Finds your position by crossing back-bearings from three known landmarks and reports the triangle of error.
Image, audio & visual tools 13 tools
  • Splits animated images into individual frames for inspection.
  • Decodes Morse beeps from an audio file or microphone input.
  • Symbol Explorer Jun 2026
    Identify, search, and decode symbols and special characters.
  • Decodes Logo-style pen path commands into drawings and encodes text back into vector commands.
  • Renders text as five-bit Baudot-style color columns inspired by X&Y album art.
  • Reads blinking-light GIF frames as on/off runs, converts the flashes to Morse, then decodes the text.
  • Binary to Image Jun 2026
    Renders bits or bytes as a bitmap and can read an image back into a 0/1 stream.
  • File Carver Jun 2026
    Scans uploaded files for embedded signatures and appended data, then carves each find into a download.
  • Hex Viewer Jun 2026
    Opens any file as a hex dump with offsets, ASCII, byte-range controls, and printable-string extraction.
  • Adjusts brightness, contrast, channels, bit planes, flips, rotations, and stretching to surface hidden marks.
  • Hides text in image least-significant bits, extracts hidden messages, and supports raw LSB inspection.
  • Magic Eye Solver Jun 2026
    Reveals the hidden depth image inside an autostereogram by comparing the picture against shifted copies.
  • Splits a black-and-white secret into two random-looking shares, or overlays shares to reveal the hidden image.
Codes & encodings 13 tools
  • Build the colored-squares substitution code with fully customizable colors, a clickable alphabet, and PNG export.
  • Base100 May 2026
    Encodes bytes as emoji codepoints and decodes them back to text.
  • Base62 May 2026
    Alphanumeric base conversion with two common alphabet orders.
  • Base32 May 2026
    RFC 4648 Base32 encoding for text and binary data.
  • Base58 May 2026
    Base58 encoding with Bitcoin and Flickr alphabets.
  • DTMF May 2026
    Decode and encode the dual-tone phone keypad tones.
  • Nihilist May 2026
    Polybius-square cipher with a keyword-based additive layer.
  • Sorts 0 to 100 by their English spelling and converts numbers to and from words.
  • Numerology May 2026
    Pythagorean and Chaldean numerology for words and names.
  • Segment Display May 2026
    Encode and decode characters drawn on 7, 9, 14, or 16-segment displays. Rebuilt from the old seven-segment code with an encode mode and a supported-characters panel.
  • Number Pad Lines Apr 2026
    Draws the keypad-line shapes for letters and numbers.
  • Planet Apr 2026
    Encode and decode USPS PLANET five-bar digit barcodes.
  • Postnet Apr 2026
    Encode and decode USPS POSTNET five-bar digit barcodes.

Upgrades to existing tools

  • Automatic Vigenère-family solvers. A Solve automatically button now cracks the key straight from the ciphertext on Vigenère, Autokey, Beaufort, Variant Beaufort, Gronsfeld (each with autokey variants), and Porta Key.
  • Cipher Identifier recognizes Morbit and cryptarithms. A 1-9 digit stream flags Morbit, and a "WORDS + WORDS = WORDS" equation flags a cryptarithm, each with a link to open the solver pre-loaded.
  • Auto coordinate chip on every text field. When text containing a recognizable coordinate (DD, DDM, DMS, UTM, MGRS, Plus Code, OSGB, Reverse Wherigo, What3Words) lands in a tool, a "Possible coordinate" chip appears with a copy button and a one-click link into the Coordinate Converter.
  • Cloud auto-solvers crack ciphers without a key. A Solve button now recovers the key and plaintext for Substitution, Playfair, Foursquare, Bifid, Trifid, Columnar Transposition, and ADFGX/ADFGVX. The heavy search runs in the cloud so it never freezes the page, and the same solvers power one-click cracking from the Cipher Identifier and Multi Decoder.
  • Multi Decoder polish. A searchable Focus combobox isolates a single cipher, sections are themed and alpha sorted with per-card descriptions, a new Syllables card aids text analysis, and multi-token base conversion plus a walking-base decoder were added.
  • Geocache Viewer converts every coordinate at once. The viewer's coordinate converter now harvests every recognizable coordinate from the pad and renders a full DD/DDM/DMS/MGRS/UTM card for each, so you can compare candidates side by side.
  • Cryptogram solving built into the Multi Decoder. The new Cryptogram Solver is also available as an optional toggle inside both Multi Decoder and Multi Decoder (classic).
  • More text-options on every input. Remove Newlines, Split Into Lines, and Normalize Spaces now sit alongside the existing case, filter, find/replace, and group buttons under any tool's text input.

Languages

CacheSleuth is now available in 10+ languages. Language names appear in their native script in the footer dropdown so you can find yours without scanning English labels. The old site used the Google Translate widget, which often broke JavaScript and stopped page features from working. The new translation runs through CacheSleuth's own translator instead, so tools keep working in any language. Translations are produced by a machine model, so some are still rough.

If you spot a translation that looks wrong or awkward, please report it on the translation feedback form. The form lets you correct several strings at once, and the fixes are applied as manual overrides that the whole site picks up on the next visit.

What Stayed The Same

  • Every tool from the old site is still here, just better organized and easier to find. Each one has been enhanced where possible with new features and improvements.
  • Tool URLs are unchanged where it was practical to keep them, so your bookmarks should keep working.
  • Nothing requires an account, and nothing tracks you across the site.
  • It is still free and ad-free.

Notice something missing or broken?

Please share your feedback if you see anything that looks off, or if you have an idea for a new feature or tool you'd like to see. While the redesign is feature complete, your input is still very welcome!

Share your feedback