# Vincula

> Design dates, export cards

- Product page: https://obelisk.club/vincula
- Platforms: iPhone
- Release status: live
- Last updated: 2026-06-29T15:47:35Z
- Pricing: free to download; the App Store listing shows any in-app purchase or subscription
- Download (iPhone): https://apps.apple.com/app/id6782260441
- Publisher: Obelisk Club (https://obelisk.club) — local-first, privacy-respecting apps built in native Swift

## About

Vincula turns numbers into Roman numerals - and Roman numerals back into numbers - the instant you type. One field, no forms, no setup. Type 2026 and read MMXXVI, or type MMXXVI and get 2026 back.

Built to be fast, calm, and completely private. Everything runs on your device. No account, no sign-in, no internet required, and nothing collected.

— WHAT MAKES VINCULA DIFFERENT —
• Instant two-way conversion — Type a number to get its Roman numeral, or type a numeral to get the number.
• Automatic detection — Figures out which way you're going, no mode to pick.
• Tap to copy — Copy the result anywhere in one tap.
• Roman dates — Turn any date into Roman numerals for engravings, tattoos, and keepsakes.
• Automatic history — Recent conversions are saved automatically.

— PRICING —
Vincula works out of the box, with no account required. Vincula Pro is a one-time unlock (no subscription) that adds vinculum notation for numbers up to 3,999,999, custom date styles (reorder day, month, and year, choose your separator), a shareable date card export, and unlimited history.

— FEEDBACK —
Made by a small indie team. Email obeliskclubclub@gmail.com with feedback, bug reports, or feature requests.

Whether you are decoding a clock face, a movie copyright, a book chapter, or designing a date to keep, Vincula makes Roman numerals effortless.

Terms of Use (EULA): https://obelisk.club/romannumerals/terms

## Key features

- **Instant two-way conversion as you type**
- **Automatic number and numeral detection**
- **Roman dates for engravings and tattoos**
- **Vinculum notation up to 3,999,999 with Pro**
- **Date styles and shareable card export with Pro**
- **Unlimited history with Pro**