Work · alternatives · 2026

24 alternatives to Roman Decimals

Convert Roman numerals to decimal numbers and vice versa.

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Roman Decimals launched in 2022; newer entries below may have overtaken it.

1. 1
   Roman Numeral Converter▲7

   Convert numbers to roman numerals & vice versa

   2025 · its alternatives →

2. 2
   Converty▲66

   Convert numbers and more

   2022 · its alternatives →

3. 3
   Numeracy▲203

   A SQL pad that gives you x-ray vision for your data

   2017 · its alternatives →

4. 4AC
   A CLI tool to generate Cistercian numerals▲51

   2021 · github.com · its alternatives →

5. 5IM
   I made a web-based notepad with a built in unit calculator▲488

   Hi HN It also supports percentages, dates and variables. I've been working on this alone for a few years now, so would love to get some feedback.

   2022 · numpad.io · its alternatives →

6. 6
   Numeracy 2.0▲421

   Write less SQL, faster

   2018 · its alternatives →

7. 7
   Binary to Decimal Converter▲5

   Binary to Decimal Converter

   Dec 2025 · universalfreetools.com · its alternatives →

8. 8
   CurrencyTomb▲138

   Convert obsolete currencies

   2024 · its alternatives →

9. 9AC
   A custom font that displays Cistercian numerals using ligatures▲171

   Feb 2026 · bobbiec.github.io · its alternatives →

10. 10
    Amount▲94

    A beautiful and simple unit and currency converter

    2014 · its alternatives →

11. 11BA
    Base32H, a human-friendly duotrigesimal number system▲87

    2020 · base32h.github.io · its alternatives →

12. 12TC
    tu – Convert natural language date/time to UTC▲83

    2024 · github.com · its alternatives →

13. 13
    Apelsin.Money▲109

    Free online currency converter

    2022 · its alternatives →

14. 14
    UnitSwap▲124

    Convert measurements or units with ease

    2024 · its alternatives →

15. 15
    Convertable▲76

    Currency calculator with on-the-fly conversion

    2018 · its alternatives →

16. 16
    Currency converter▲79

    Powerful and convenient currency converter 💰

    2019 · its alternatives →

17. 17
    Unit Converter Pro - currency and units converter▲80

    Fast and easy to use currency and units converter

    2017 · its alternatives →

18. 18
    Numly▲2

    Convert numbers across 12 numeral systems

    Jun 2026 · pypi.org · its alternatives →

19. 19
    valuta.exchange▲72

    A simple web currency converter 💱

    2020 · its alternatives →

20. 20TA
    Turn any number into a complicated math expression▲36

    Credit goes to the contributors of https://github.com/enjeck/num2math for making the tool's core.

    2024 · scientific.place · its alternatives →

21. 21FP
    Floating point arithmetic types in C++ for any size and any base▲79

    Since there is so much interest on HN in floats lately and their software implementations, I wanted to show mine. It has no use and is just for teaching me floats and C++. Give me your thoughts.

    2024 · github.com · its alternatives →

22. 22IM
    I'm building a tool to practice numbers in Arabic▲50

    Recently moved to Egypt, and in dire need to get the numbers down. Great excuse to explore learning software some more. Possibly very niche, but maybe it is useful for someone else out there. Feedback is always welcome.

    2023 · arabic-numbers.koljapluemer.com · its alternatives →

23. 23DA
    dnum − A small TypeScript library to handle decimal numbers▲42

    2023 · github.com · its alternatives →

24. 24
    Decimal Converter▲3

    Convert numbers instantly using the Decimal Converter.

    Jun 2026 · geteasetools.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →