📊Cryptanalysis Tool (English)
Letter Frequency Counter & Analyzer
Analyze unigrams, digraphs, and trigrams in any scrambled text. Compare letter distributions against standard English ETAOIN SHRDLU and calculate the Index of Coincidence (IoC).
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Total Letters0
Unique Letters0 / 26
Index of Coincidence0.000
Vowel Ratio0%
Unigram Distribution vs Standard English (ETAOIN SHRDLU)
Top Digraphs (2-Letter Pairs)
Top Trigrams (3-Letter Sequences)
Cipher Decoders & Cryptanalysis Tools
Cryptogram Solver →
Automated constraint-satisfaction solver and interactive dual-line grid.
Word Pattern FinderWord Pattern Finder →
Search words matching cipher pattern signatures (e.g. 0.1.1.2 for "BOOK").
How to SolveRead the complete solving guide →
A structured deduction process based on English letter frequencies and syntax.