# Axiomeer — RPN ALG Scientific Calculator > RPN ALG Scientific Calculator (iPhone/iPad app by JESUS MARIO SUBIAS DOMINGO.) - Source: https://appshunter.io/ios/app/axiomeer/id6759169671 (this page in markdown: same URL + `.md`) - Developer: [JESUS MARIO SUBIAS DOMINGO](https://appshunter.io/developer/1024071884) - Category: Utilities, Productivity - Price: Free - Age rating: 4+ - Requires: iOS 17.0 · 7 MB - Languages: American English - Released: 2026-02-18 - Data updated: 2026-03-26 - User reviews in markdown: https://appshunter.io/ios/app/axiomeer/id6759169671/reviews.md ## What is Axiomeer? Calcula is a powerful scientific calculator that combines classic RPN stack workflow with a full Algebraic (ALG) mode in one app. Designed for advanced users, engineers, students, and technical professionals, Calcula lets you choose the input style you prefer, then move seamlessly between both worlds. Two calculation modes, one engine - RPN mode for fast stack-based operation - ALG mode with scientific keypad and direct expression input - Instant switch between modes from the main interface Advanced algebraic input - Scientific ALG keypad with prefix actions (`f/g`) - Keyboard or keypad entry - Live rendered math preview with pan and pinch zoom - Build, inspect, and refine long expressions comfortably Rich math objects - Real and complex numbers (Cartesian/Polar behavior) - Fractions, vectors, and matrices - Matrix/vector operations including products, transpose, determinant, inverse, dot and cross products Units, constants, and formatting - Integrated units workflow in expressions - Access to constants database in ALG flow - Shared global number formatting between RPN and ALG Functions and persistence - Define and edit functions from both RPN and ALG workflows - Coherent shared function database - Draft and editing improvements for smoother continuity Statistics and scientific tools - Shared statistics memory across RPN and ALG - Statistical operations and previews integrated into ALG workflow - Extended scientific function coverage with ongoing expansion Calcula is built for real technical work: precision, depth, and flexible interaction without sacrificing speed. ## Version history (last 5 releases) ### 2.5 — 2026-03-19 Calcula 2.5 is a major upgrade focused on hybrid scientific workflows. New true dual-mode experience: RPN and Algebraic (ALG) now work as equal primary modes. New ALG scientific keypad with dynamic f/g prefixes (plus HYP and SP layers) for faster advanced entry. Live rendered math preview with pinch/drag navigation and automatic fit for long expressions. Full support for complex numbers, fractions, vectors, and matrices in ALG workflows. Expanded linear algebra tools in ALG: transpose, determinant, inverse, scalar/dot/vector products, and matrix operations. Improved token interoperability: expression-based values remain editable and compatible across stack operations. Shared global behavior between RPN and ALG for formatting, units, constants, memory, and statistics. Better stats and memo integration in ALG, including operational shortcuts and reporting. Function workflow improvements: create/edit/save functions from ALG with bidirectional compatibility with RPN function tools. New bundled in-app User Guide available from SYS (works offline). ### 2.4.1 — 2026-03-17 - New full **Algebraic (ALG) mode** integrated with classic **RPN** - Improved ALG scientific keypad with `f/g` secondary functions - Real-time rendered expression preview with pan/zoom “infinite paper” behavior - Better support for **complex numbers, vectors, matrices, units, constants, statistics, and combinatorics** in ALG - Editable algebraic-expression tokens across stack operations - New MEMO integration between RPN and ALG (including expression-aware recall/store flows) - Smoother UX and layout refinements across calculator screens - iPhone now stays in **portrait orientation** for a more consistent experience - Stability fixes and parser/evaluation improvements ### 2.4 — 2026-03-16 - New `RPN / ALG` mode switch in the main UI - New scientific ALG keypad with `f/g` prefix actions - Live formatted math preview (pan + pinch zoom) - Expression tokens can be sent to stack and edited later - Improved complex number workflow (Cartesian/Polar aware) - Expanded vector/matrix support (dot, cross, transpose, inverse, determinant, products) - Shared statistics memory between RPN and ALG flows - Units + constants now integrated in ALG expressions - Better function workflow: create/edit in ALG and keep coherence with RPN function database - Performance and stability fixes, including plot export behavior and draft persistence improvements ### 2.3 — 2026-03-05 - Added Algebraic Input (long-press ENTER) while keeping full RPN operation. - New scientific algebraic keypad optimized for iPhone, with HP-style key ordering. - Live postfix preview and live result preview while typing expressions. - Added support for complex notation (for example: 1+2i), vectors, and matrices in algebraic input. - Algebraic expressions are now stored as editable ƒx tokens: evaluate to X, keep result on stack, and reopen expression with long-press on register. - Improved handling of long expressions (auto-scroll keeps latest input visible). - Fixed keyboard focus issues in algebraic/constant input flows. - Improved matrix multiplication behavior and shape handling. - Automatic normalization: fractions with denominator 1 are converted to decimal form. - Simplified algebraic evaluate actions and cleaned up input UI. ### 2.2 — 2026-03-02 This update focuses on faster workflows, better plotting, and more flexible programmed functions. - Improved 3D visualization with enhanced lighting and shading. - Added new plot types, including Contour Plot and 2D Implicit plotting. - Reorganized Plot options for a cleaner and more intuitive menu. - Programmed functions are now more powerful: better editing flow, token-aware behavior, and direct complex constant input (for example `2+3i`). - Better keyboard behavior in sheets, including improved dismissal handling. - General UI polish, stability improvements, and bug fixes across the app. ## More apps by JESUS MARIO SUBIAS DOMINGO - [Canta_Lite](https://appshunter.io/ios/app/canta-lite/id6478762226) All apps by JESUS MARIO SUBIAS DOMINGO: https://appshunter.io/developer/1024071884 --- *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 2026-03-26.*