Free online tools that just work
Calculators, SEO tools, text utilities, and converters — all running in your browser. No sign-up, no uploads, no watermarks.
Instant
Results in real time, no waiting.
Private
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Free
Every tool, no paywall.
SEO Tools
5 toolsDuplicate Content CheckerCompare two texts and see exactly how similar they are.Keyword Difficulty CheckerEstimate how hard a keyword is to rank for.SEO Audit ToolScan a page for on-page SEO issues.Schema Markup GeneratorGenerate JSON-LD structured data for any page type.Domain Rating CheckerCheck a domain's authority and backlink strength.
Calculators
14 toolsROI CalculatorCalculate return on investment for any project.CAC CalculatorCalculate customer acquisition cost.LTV CalculatorEstimate customer lifetime value.Unit Economics CalculatorModel revenue, cost, and margin per unit.Churn Rate CalculatorCalculate customer or revenue churn.COGS CalculatorCalculate cost of goods sold.Debt to Equity CalculatorCalculate the debt-to-equity ratio.Break Even CalculatorFind your break-even point in units and revenue.Cap Table CalculatorModel founder and investor ownership across rounds.Equity Dilution CalculatorSee how a funding round dilutes ownership.Revenue Multiple CalculatorEstimate startup valuation from ARR and growth.Convertible Note CalculatorModel how a convertible note converts to equity.Burn Rate CalculatorCalculate gross/net burn and cash runway.Angel Investment CalculatorSize an angel round and its ownership impact.