# Dual-Model Scientific Calc — Dual-Model Scientific Calc

> Dual-Model Scientific Calc (iPhone/iPad app by OuTech Limited.)

- Source: https://appshunter.io/ios/app/dual-model-scientific-calc/id6758953284 (this page in markdown: same URL + `.md`)
- Developer: [OuTech Limited](https://appshunter.io/developer/1864413350)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 26 MB
- Languages: Chinese
- Released: 2026-02-26
- Data updated: 2026-06-10
- User reviews in markdown: https://appshunter.io/ios/app/dual-model-scientific-calc/id6758953284/reviews.md

## What is Dual?

Dual-Model Scientific Calc is a polished scientific calculator app built for students who want real exam-style practice, not just quick answers. It is especially popular with Hong Kong HKDSE students, but the core value is universal: two Casio-style calculator workflows in one app.

**What makes it different**

• Switch instantly between fx-50FH II and fx-3650PII style layouts
• Practice key positions, mode flow, Replay, and common exam habits
• Keep your last model, key setup choices, and saved PRGM programs
• Open an optional beginner tutorial whenever you want to learn features step by step

**Core calculator features**

• 6 core modes: COMP, SD, REG, BASE, CMPLX, PRGM
• Trig, logs, exponents, powers, roots, factorial, nPr, nCr
• Fractions, complex numbers, statistics, base conversion, and programmable functions
• 40 scientific constants and 23 built-in formulas
• Ans memory, Multi-replay, and calculation history for faster practice

**Best for**

• Students who want Casio-style scientific calculator practice
• Learners who want to build calculator muscle memory before exams
• Anyone who wants a dual-model scientific calculator with programmable support

**Optional purchase**

• One-time Remove Ads purchase for distraction-free study

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |



## Version history (last 5 releases)

### 1.3.0 — 2026-03-30

v1.3.0 What's New:

[Better for long-term practice]
- The app now remembers your last model and key setup choices
- PRGM programs now stay saved between launches
- Added an optional beginner tutorial entry so students can learn features without interrupting normal use

[Store and language alignment]
- Updated store copy and localization settings for a more consistent Traditional Chinese experience

[Stability Improvements]
- Expanded regression coverage for setup restore and PRGM recovery flows

### 1.2.2 — 2026-03-20

v1.2.2 What's New:

[Better Experience]
- Added an in-app review prompt to help more students discover the app
- Refreshed the dual-model hero screenshots for a clearer first impression

[More Accurate Calculations]
- Fixed real-device style CMPLX chained i input such as ii / iiii
- Fixed multiple BASE, PRGM, and fraction-display logic details

[Stability Improvements]
- Expanded regression coverage for better reliability

### 1.2.1 — 2026-03-18

v1.2.1 What's New:

[More Accurate Calculations]
- Fixed real-device style CMPLX chained i input such as ii / iiii
- Fixed multiple BASE, PRGM, and fraction-display logic details

[Better Dual-Model Experience]
- Updated dual-model store assets and marketing copy
- Further refined the fx-3650PII / fx-50FH II authentic feel

[Stability Improvements]
- Expanded regression coverage for better reliability

### 1.2.0 — 2026-03-17

v1.2.0 What's New:

[New Dual-Model Switching]
- Added fx-3650PII as a second calculator model with instant switching from the top-left corner
- Kept the original fx-50FH II workflow while introducing a distinct fx-3650PII look

[More Authentic Calculator Behavior]
- Added fx-3650PII PRGM 390B flow and model-specific programmable behavior
- Improved CALC / SHIFT+CALC input guidance for calculus entry
- Refined Replay pad arrow size and spacing to better match the real device

[Stability and UI Improvements]
- Expanded regression and interaction smoke coverage across modes
- Improved display details and key interaction clarity

### 1.1.2 — 2026-03-07

v1.1.2 What's New:

[Better Real Calculator Experience]
- Pressing a function key after = now auto-inserts the previous answer
- STO/RCL variable storage now uses direct key press, just like the real calculator
- All 9 variables supported: A B C D E F M X Y
- ALPHA + cos/tan correctly outputs variables E/F

[Display Improvements]
- Improved rendering of sin⁻¹, cos⁻¹, tan⁻¹ and other math symbols
- All symbols display correctly offline on all devices

[Usability Improvements]
- Enlarged button touch targets for easier tapping
- Improved hyp mode stability
- Improved DEL key behavior for function deletion

## More apps by OuTech Limited

- [棋藝研究所 Chess Academy](https://appshunter.io/ios/app/chess-academy/id6757407305)
- [Genie - AI Character Guesser](https://appshunter.io/ios/app/genie-ai-character-guesser/id6758269749)

All apps by OuTech Limited: https://appshunter.io/developer/1864413350

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*