Pansophia vs Open Elifba

Pansophia is an offline STEM reference for engineers, scientists, and students — 25,400+ formulas, compounds, and reference tables across 18 disciplines including physics, chemistry, biology, mathematics, and every major field of engineering. No account. No ads. No tracking. No internet required. About a third of every discipline is free. WHY PANSOPHIA Every entry is curated, cross-referenced, and verified — not generated. When you need a decay constant, a beam capacity, or a CAS number, it has to be right, and it has to work without a signal. Built for the lab bench, the job site, and the exam desk. The kind of data you used to search for daily, or flip through a mountain of handbooks to find — now in one place. WHAT'S INSIDE - 3,000+ biological species with habitat, functions, structures, timeline - 1,200+ chemical compounds with properties, synthesis, hazards & CAS numbers - 700+ mechanical components — fasteners, bearings, hinges, latches, brackets, clamps, belts/chains, flanges, gears, couplings, pumps, pneumatics + hydraulics, etc - 500+ electronic components — transistors, op-amps, microcontrollers (Arduino/STM32/ESP32/RP2040), motors, sensors, LCDs, batteries, etc - 350+ chemistry lab reference entries — solvents, buffers (Tris/PBS/HEPES), catalysts (Pd, Grubbs, MacMillan), spectroscopy (NMR/IR/MS), HPLC/GC chromatography - 254 materials — alloys, polymers, ceramics, composites, AHSS, bulk metallic glasses, high-entropy alloys, fracture toughness & creep data - 231 astronomical objects — Messier catalog, notable stars, exoplanets, black holes - 280+ structural engineering tables — AISC W/HSS shapes & beam design, RC design, NDS wood design, foundations (spread/pile/mat/retaining), seismic design, soil classification, building codes, bridges - 80+ chemical engineering reference — distillation & absorption unit ops, TEMA heat exchangers, CSTR/PFR/PBR/fluidized reactors, ASME VIII pressure vessels, API 650/620 storage tanks, relief systems, ISA-5.1 P&ID symbols, NEC/ATEX hazardous areas, HAZOP/LOPA/SIL methodology - 220+ biomedical reference entries — FDA device classes, ASTM F-series implants, ISO 10993 biocompatibility, clinical trial phases, lab values (CBC/BMP/CMP/LFTs/ABG), vital signs by age, imaging (X-ray/CT/MRI/US/PET) - 280+ pharmacology drug classes — full WHO ATC coverage with mechanism, dosing, adverse effects, interactions - 111 nuclear isotopes with cross-sections and decay data - 72 named organic reactions with reagents, conditions & mechanisms - 61 algorithms with time/space complexity analysis - 56 statistical tests with assumptions, formulas & when to use each - 48 math identities — trig, integrals, Laplace & Fourier transform pairs 18 DISCIPLINES Physics, Chemistry, Biology, Mathematics, Computer Science, Artificial Intelligence, Statistics & Data Science, Electrical Engineering, Mechanical Engineering, Civil & Structural Engineering, Chemical Engineering, Biomedical Engineering, Industrial & Systems Engineering, Nuclear Engineering, Materials Science, Astronomy & Astrophysics, Earth & Environmental BUILT-IN TOOLS - Scientific Calculator — 52 built-in constants, trig/log/factorial, history - Unit Converter — 22 unit families including electrical & magnetic - Physical Constants — 163 constants with uncertainties, searchable & copyable - Quiz & Flashcards — SM-2 spaced repetition for coursework and exam prep CROSS-DISCIPLINE CONNECTIONS 27,500+ cross-references link related concepts across fields. Tap any reference to jump between disciplines — see how thermodynamics connects to chemical engineering, or how linear algebra powers machine learning. WORKS OFFLINE — ALL DATA BUNDLED All 25,400+ entries ship inside the app. Dark theme, native LaTeX equation rendering, and interactive 3D molecular models. PRICING About a third of every discipline is free — no account, no time limit. Unlock all 18 for $9.99, or one for $0.99. One-time purchase, no subscriptions.

Open Elifba is a free, open-source app designed to help you learn to read Arabic script — from the very first letter to advanced Tajweed (Quran recitation) rules. LEARN AT YOUR OWN PACE Whether you are an absolute beginner or looking to sharpen your Tajweed knowledge, Open Elifba guides you through a structured curriculum with clear, bite-sized lessons organized into categories. WHAT YOU'LL LEARN • Arabic Letters — Recognize and pronounce all 28 letters of the Arabic alphabet. • Letter Forms — Learn how each letter changes shape at the beginning, middle, and end of a word. • Diacritics (Harakat) — Master Fatha, Kasra, Damma, Sukun, Shadda, and Tanween. • Vowel Lengthening (Madd) — Understand Natural Madd, Connected Madd, Disconnected Madd, Necessary Madd, Temporary Madd, and Soft Madd. • Tajweed Rules — Practice Ikhfā' (Concealment), Izhār (Clear Pronunciation), Idgham (Merging), Iqlāb (Letter Change), Qalqalah (Echoing Sound), and more. • Pronoun Rules — Learn extended and non-extended pronoun rules. • Lafzatullah — Study the special pronunciation rules for the word "Allah." AUDIO-GUIDED PRACTICE Every exercise comes with native audio pronunciations. Tap the card to hear the correct sound and practice until you get it right. SMART SPACED REPETITION Open Elifba uses a spaced repetition system to intelligently schedule your reviews. Exercises you've mastered appear less frequently, while ones that need practice come back sooner — so you spend your time where it matters most. TRACK YOUR PROGRESS • See your accuracy rate and average response speed for each category. • Monitor how many exercises you've reviewed vs. how many remain. • Categories are color-coded to highlight what needs attention. BEAUTIFULLY DESIGNED A clean, modern interface with dark mode support. Elegant card-based exercises with smooth animations make learning feel effortless. 12 LANGUAGES SUPPORTED The app interface is available in English, Turkish, German, French, Spanish, Portuguese, Italian, Russian, Hindi, Japanese, Chinese, and Danish — so you can navigate in the language you're most comfortable with. FREE & OPEN SOURCE Open Elifba is completely free with no in-app purchases. The source code is openly available, making it a community-driven project you can trust. Start your Arabic reading journey today with Open Elifba.