Free investing tools

Smarter investing math, in seconds.

Calculators and AI research tools for everyday investors. No signup, no paywall. Everything runs in your browser.

Transparent

Start with numbers, not guesswork

Every tool shows its formula and assumptions. Change any input and the results update instantly. When you like a scenario, share the URL. It keeps your inputs.

Shows the formula

No black boxes. See exactly how each result is computed.

Shareable results

Your inputs live in the link, so you can bookmark or send it.

Private by design

All math runs in your browser. Nothing you type is stored.

Free, no signup

No email gate, no trial, no upsell in the middle of a calculation.

Toolkit

Plan every stage of your investing

From the first $100 a month to your FIRE number, and the research in between.

balance by year

$548,915

Compound

See how money snowballs with monthly contributions and yearly raises.

Open calculator

yield 3.5% growth 6%

drip on

year 20 →

monthly income $1,678

portfolio $430,614

Dividends

Project monthly passive income with DRIP, dividend growth and tax.

Plan income

$50,000/yr ÷ 4%

FIRE number $1,250,000

years to FI 23.6

FI age 53

FIRE

Find your number and the age you can stop needing a paycheck.

Find my number

❯ research MSFT

You are a skeptical equity

research analyst…

1. MOAT ····

2. FINANCIALS ··

3. BEAR CASE ·

AI Prompts

Turn “is NVDA a buy?” into an analyst-grade research brief.

Build a prompt

AI research

Research with AI, without the hype

Vague questions get vague answers. Build a structured prompt that makes ChatGPT, Claude or Perplexity work like a skeptical analyst, then verify what it tells you.

Analyst-grade structure

Moat, financials, valuation and risks, worked through step by step instead of a generic summary.

Bear case built in

AI models tend to agree with you. Every prompt forces the strongest argument against your thesis.

One click to your AI

Open the prompt in ChatGPT, Claude or Perplexity, or copy it anywhere.

Quick answers

Common questions

Are these calculators really free?

Yes. Every tool is free with no signup. The site is supported by ads and affiliate partners, which never change the math.

Do you store the numbers I enter?

No. All calculations run in your browser. Your inputs appear only in the page URL so you can bookmark or share a result.

Is this financial advice?

No. These are educational tools that show what happens under the assumptions you choose. For personal advice, talk to a qualified, fee-only financial adviser.

How does the AI prompt tool work?

You pick a ticker, an investing style and the analysis you want. The tool writes a structured research prompt you can open in ChatGPT, Claude or Perplexity. We never call an AI model or see your prompt.

What return should I assume?

Many planners use 6–8% a year for a diversified stock portfolio, or about 5% after inflation. Try several rates. The range is more useful than a single number.