About Swift Penguin

Who I am

I'm William, based in the UK. I've been putting my own money in the market for about ten years — ISAs, broker apps, the usual retail mess — and I've spent just as long living in the tools: position size, charts, paper desks, portfolio maths, statement tables when something feels off. I'm not a licensed adviser, not a fund manager, and not running a tip service. I'm a developer who got annoyed enough at paywalled calculators to ship my own.

Swift Penguin is that project: the stuff I actually want open in a browser tab, without another "create an account" wall. If a tool or guide is on this site, I either use it myself or built it because I kept wishing it existed.

What this site is not

Swift Penguin does not tell you what to buy. No buy/sell/hold calls, no "starter portfolios," no tip lists with a wink. Ten years of investing my own cash shapes how I build calculators and research pages — it does not mean I get to pick your holdings. You get the tools and the data; you make the call.

Company pages and statement tables are reference material. Guides explain how the mechanics work. What fits your life is your problem (in the good sense) — or a licensed adviser's, if you want personal advice.

Why I built this

I tried a lot of other platforms. Plenty are fine — until they want an email and a subscription before you can run a simple calculator. I got annoyed enough to build my own: risk math, research helpers, a paper desk, guides that don't talk like a compliance pamphlet — then put it here so anyone can use it.

No signup for the core tools. No "start free trial." Open the page, poke the numbers, leave when you're done. That was the whole point.

What you'll find here

Free tools and guides shaped by what I've actually used (and wished existed) over a decade of messing around in markets. A few examples:

• Position size and risk/reward calculators
• Live stock lookup, screener, and sector heatmap
• Company research pages with statements and methodology notes
• Compound growth, DCA, dividend / DRIP tools
• Paper trading simulator and portfolio tracker
• Guides, glossary, and a blog in plain English

Browse the full set on Tools, Stocks, and Guides. How we source market data is on the data methodology page. Content is educational with worked examples — not personal advice, and not stock recommendations.

How the site stays free

No subscriptions. Light analytics help me see what people actually use. There may be display ads when the site qualifies. Broker links on this site are ordinary links to official sites — no referral codes right now. The tools stay free either way.

How I write

I write the guides and build the tools myself — no scraped SEO slurry. Worked examples, plain definitions, and the awkward caveats (yes, capital at risk). I still mess up; if you catch something, tell me.

Contact & policies

Feedback and questions: Contact page or [email protected].

Please also read the Privacy Policy and Terms of Use.

Disclaimers

Educational only — not financial, investment, tax, or legal advice. I don't tell you what to buy or sell. Markets can lose you money. Use the tools and data here to inform your own judgement, or talk to someone licensed if you need personal advice. Calculator outputs follow your inputs and simplified assumptions. Past performance (mine included) doesn't predict the future. Swift Penguin is an independent educational site — not a brokerage or advisory firm.