Alternatives
Products that do what The Tortoise – a sophisticated retirement calculator does
Hi HN! I've been working on this calculator for some time now. It started off as a tool to help me do some retirement planning and I think it could be broadly useful to others as well. It's very generic, which is both good and bad. Good, because you are not beholden to the assumptions of the model, like in many other calculators. This also means that it’s not US centric. On the other hand, you do need a bit of financial planning knowledge to be able to use it effectively. There are many retirement calculators out there -- here's what I think The Tortoise does better than most: 1. An easy to…
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2018 · investmentcalculator.io
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Quick background: I used to code. Studied it in school, wrote some projects, but eventually convinced myself I wasn't cut out for it. Too slow, too many bugs, imposter syndrome — the usual story. So I pivoted, ended up as an investment associate at an early-stage angel fund, and haven't written real code in years. Fast forward to now. I'm a Buffett nerd — big believer in compound interest as a mental model for life. I run compound interest calculations constantly. Not because I need to, but because watching numbers grow over 30-40 years keeps me patient when markets get wild. It's basically…
Jan 2026 · calquio.com
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Most retirement calculators either oversimplify things or ask you to link your accounts so they can make money off your data. I wanted something that actually helped me see if I was on track without handing over a bank login, so I built RetireNumber. It's a privacy-first retirement planner. You type in your own numbers. No account linking, no selling your data, no VC. Just me and a subscription. The engine does real math: Monte Carlo with 1,000 runs, historical backtesting to 1928 using Shiller's Yale data, tax-aware withdrawal strategies, and scenario comparison so you can try different…
Feb 2026 · retirenumber.com
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Made this using Power BI and the Crypto Watch API. Started making this in November 2021, but never got around to publishing it, so that is the reason for the 'FOMO' in the title - probably a good thing if you 'missed out' on the crypto hype late last year. Now it serves as a way to see how much you 'saved' by not putting in money. Hope someone finds it fun!
2022 · vidacode.github.io
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Hey everyone! I'm Rob and I want to share what I've built - a solid ledger behind simple API: https://decimals.app The ledger is a key piece of any financial system and is easy to get the design wrong, resulting in troubles for making sure money movements are adding up. I took a lot of inspiration from good designs from Square, Uber, and others for the scalability and security aspects. And on the usability side, I applied many concepts from the Ledger CLI, making it very easy to use. I'm really happy I get to show this to you all, thank you for reading about it! Please let me know…
2020
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2020 · lunchmodel.com
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A complete retirement planner covering accounts, taxes, pensions, withdrawals, and life events, stress-tested against thousands of simulations drawn from over a century of real market history. Start with a free quick check, no sign-up required.
11d ago · foresightplanner.com
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I’ve always found that online calculators tend to have bad UIs, especially on mobile. Most of the calculator websites I’ve come across use outdated and inconvenient ways of inputting data, or they format the results in confusing ways. I’ve noticed that fraction calculators (especially mixed fractions) are terrible to use, even on desktop. I haven’t built one of those yet, but it’s something I’m planning to tackle soon. This is a project I’ve always wanted to work on, but I’m relatively new to this space. So far, I’ve created a collection of simple calculators focused on math and finance. I’d…
2025
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I always spent more than planned so I decided to try budgeting applications. It turns out you need to be an accountant or a control freak for those apps. So I made Paktol with extreme simplicity & efficiency in mind. My sole goal is to spend less than I planned. Where Paktol differs: - you define a monthly goal - every month your position starts at $0 and it increases every second - when you add an expense you will either stay in green if above your position or go in red and we tell you how long you have to wait It's simple, boring and not sexy but it works for me (and friends/family).…
2024 · paktol.t10s.com
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2012 · networthify.com
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2018 · engaging-data.com
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Hey. I built a loan (mortgage) calculator that lets you compare the savings from overpaying your loan with the potential profits from investing those extra funds. It will help you answer a key question: is it smarter to overpay your mortgage or invest the extra money? See the hard data and make smarter financial choices! The comparison is simple: 1. Both the overpayer and the investor have the same mortgage. 2. They both spend the same amount monthly. 3. The overpayer overpays the mortgage installments. 4. The investor puts that extra money into investments. Who comes out ahead after the…
2024 · showloan.info
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Hi HN, I am a solopreneur in the evenings and a software engineer during the day. In the past, I have created lots of calculators for my web projects and freelancing friends. These were pretty basic, but users always welcomed them. I also used currently available builders, but the problem was that they were either slow, broke on mobile devices, had nonsense page view limits, or were expensive. Some even ticked all those boxes. So I have decided to create my own, with a simple interface, and called it Creative Widgets (if it ever takes off, I plan to add more exciting stuff like charts, etc,…
2024 · creativewidgets.io
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The best web calculator for wealth estimation
6d ago · mynetworthcalculator.com
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Your personalized roadmap to financial independence.
Jun 2026 · novaplanner.app
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You can adjust inputs and immediately see how the outcome changes. Results include clear success rates, cash-flow charts, and an “Under the Hood” view that shows exactly how the numbers are worked out.
Nov 2025 · pulse-browser.com
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