Twin Calc: Two Calculators
Split screen, side by side
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Two calculators on one screen. Compare estimates, split a bill, or convert while you total. PRO sends A's answer straight to B — one-time purchase.
Twin Calc puts two independent calculators on one screen — a simple calculator app for anyone who has ever wished they had two.
Compare two estimates. Split a bill two different ways. Convert on one side while you total on the other. Check last year's numbers against this year's. Open Twin Calc and calculators A and B are already there — no onboarding, no sign-up.
Features
- Calculator A and B stacked vertically (or side by side in landscape), each fully independent
- Works just like the built-in iPhone calculator: + − × ÷, %, ±, backspace, and thousands separators
- An expression line shows what you are calculating, so you never lose track
- Drag the divider to resize the two calculators; double-tap to reset to half and half
- Long-press a result to copy it; swipe left to delete one character
- Haptic feedback (can be turned off)
- History (tape) keeps your results automatically — tap to copy, or send a result back to A or B
- Light and dark themes that follow your system setting
- Both calculators and the split ratio are restored exactly as you left them
Free
- Two calculators, history, and reuse of your 3 most recent results
- No ads
PRO (one-time purchase)
- Never retype a result again: send A's answer straight to B, or swap A and B in one tap
- Bring back any past result from history
- 3 extra themes: Midnight, Paper, and Mono
PRO is a single one-time purchase. No subscription, no extra fees.
Everything you calculate stays on your device and is never sent to a server.
For iPhone (portrait and landscape).
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Hiroki Sugiyama, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Hiroki Sugiyama
- Size
- 47.3 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- PRO $3.99
- Copyright
- © 2026 Hiroki Sugiyama