Calcu Plus vs Hapi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calcu Plus
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Make your calculations easy and colourful Features in free version: Basic calculations with plain color themes Choose button vibrate On/Off on tap Choose decimal places Features With In-App Purchase: Enjoy All Shaded themes including Dark Theme This is my first App. please let me know of any errors and suggestion you have. I will be happy to include more ideas in future.
Hapi
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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 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 many languages 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 • Extra Premium themes • New themes added from time to time Themes are updated from time to time. Some 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. The yearly subscription starts with a 14-day free trial. After the trial, it renews automatically at the yearly price unless you cancel at least 24 hours before the trial ends. You can manage or cancel it in your App Store account settings. This is always your choice. MADE BY AN INDEPENDENT DEVELOPER Hapi is made with care by an independent developer in İzmir, Turkey. 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/
Screenshots
Verdict
Calcu Plus and Hapi are too close to call on the numbers: across 5 compared parameters — price, update cadence, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Calcu Plus sells 1 one-off in-app purchase and Hapi sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
Calcu Plus ships an update every 11 days, Hapi every 2 weeks. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.
| Parameter | Calcu Plus | Hapi |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 11 days — better | Every 2 weeks |
| Ads | — | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 16.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Jaspreet Singh | LedaPremium |
In-app purchases
Calcu Plus
- Get All Themes$3.99
Hapi
- HaPi Premium Monthly$1.991 Month
- HaPi Premium Yearly14 Days trial$9.991 Year
- HaPi Premium$19.99









