What is the Substitution Solver tool?

Crack a monoalphabetic substitution cipher via frequency analysis. This free online tool is available at NumbersChecker with no login required.

Is the Substitution Solver tool free?

Yes, the Substitution Solver tool is completely free to use at NumbersChecker. No account or installation is needed — results are instant.

How do I use the Substitution Solver tool?

Enter your input into the form at https://numberschecker.com/tool/substitution-solver, click Run, and the result appears instantly. Click any result value to copy it to your clipboard.

Is there an API for the Substitution Solver tool?

Yes. Send a POST request to https://numberschecker.com/api/substitution-solver with your input as a JSON body. The API is free and requires no authentication.

Puzzles monoalphabeticfrequencycrack

Substitution Solver

Crack a monoalphabetic substitution cipher via frequency analysis.

About the Substitution Solver Tool

Crack a monoalphabetic substitution cipher via frequency analysis. This free online tool runs entirely in your browser — no login, no installation, and no data is stored.

This tool is part of the Puzzles category on NumbersChecker. Browse all Puzzles tools or explore all 139 tools.

Related: monoalphabetic · frequency · crack

API usage

POST /api/substitution-solver
Content-Type: application/json

{
  "text": "your input here"
}