Fast, private, browser-based tools
Free tools for AI builders, developers, marketers, and online businesses. Start with token counters, JSON utilities, campaign builders, and business calculators that run locally in your browser.
Popular tools
High-intent utilities for everyday AI, developer, marketing, and business workflows.
LLM Token Counter
Estimate prompt tokens, characters, words, and rough model budget before sending text to an AI model. Runs in your browser with no account required.
Developer ToolsJSON Formatter
Format and pretty-print JSON so it is easier to read, debug, copy, and share. Runs in your browser with no account required.
Developer ToolsJWT Decoder
Decode JWT header and payload locally so you can inspect claims without uploading tokens. Runs in your browser with no account required.
SEO & Marketing ToolsUTM Builder
Build tagged campaign URLs for analytics, ads, newsletters, and launch tracking. Runs in your browser with no account required.
SEO & Marketing ToolsSERP Snippet Preview
Preview how a title, URL, and meta description may appear in Google search results. Runs in your browser with no account required.
Business CalculatorsROAS Calculator
Calculate return on ad spend from revenue and advertising cost. Runs in your browser with no account required.
Business CalculatorsProfit Margin Calculator
Calculate profit and margin from revenue and cost. Runs in your browser with no account required.
Business CalculatorsLTV Calculator
Estimate customer lifetime value from ARPA, gross margin, and churn. Runs in your browser with no account required.
Built for private, low-friction work
WiseTool keeps the first version static, fast, and local-first. No account, no database, and no upload step for MVP tools.