Chain Calculator vs HaPi

[Key Features] - Edit & Auto-Update : Modify any past value and watch all connected results update in real-time. - Save History : Save your frequently used formulas to your favorites and reuse them whenever you need. - Dark Mode Support : Enjoy a sleek, eye-friendly dark mode that adapts to your system settings. - Ad-Free Experience : Enjoy a clean, distraction-free environment with absolutely no ads.

OUR STORY HaPi started with something I have always loved: numbers. I use a calculator all the time, and I have always enjoyed playing with numbers and finding little reasons to make math more fun. One day, I thought: what if a calculator could make people smile too? So I started playing with the idea. A few experiments turned into funny sounds, unexpected reactions, and eventually HaPi. What started as a simple idea to make math a little more fun became something much more entertaining than I expected. Sometimes, even a calculator can have a personality. HOW IT WORKS Pick a theme and start calculating. Every number key shows its own picture, displays its name in your language and plays its own sound. WHAT YOU CAN DO • Add, subtract, multiply, divide and work with percentages • Hear a different sound on every key • See a picture and a name on every number • Watch confetti burst when you press equals • See your full calculation above the result • Switch themes with one tap • Turn sounds on or off at any time • Use HaPi in your own language GREAT FOR Quick daily math, checking a bill, or a little fun with sounds. FREE VERSION • Music and Animals themes • The full calculator with sounds and confetti • No ads of any kind PREMIUM • All Premium themes • Seasonal themes that change through the year • New themes added from time to time Themes are updated from time to time. Some seasonal themes stay for a while and then make room for new ones. You can choose a monthly subscription, a yearly subscription or a one-time Lifetime purchase. This is always your choice. MADE BY AN INDEPENDENT DEVELOPER HaPi is made with care by an independent developer in İzmir, Turkey. WELCOME GIFT Every new user gets 14 days of Premium as a gift. You do not need a card or a subscription. After 14 days, HaPi goes back to the free version automatically. PRIVACY HaPi uses Firebase Analytics and Crashlytics to understand how the app is used and to fix crashes. HaPi does not need an account. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/