Equation Encyclopedia vs Qedra

Master 3,000+ Formulas, 170+ Expert Revision Guides, and AI Study Tools Equation Encyclopedia brings GCSE, A-Level, IB, AP, university, and professional study into one app. Search 3,000+ formulas across Mathematics, Physics, Chemistry, Biology, Engineering, Finance, Geography, Medicine, Computing, Geology, Psychology, Economics, Sociology, and Quantum Computing, with offline access after login. FORMULA LIBRARY - 3,000+ formulas across GCSE, A-Level, IB, AP, and university pathways - Coverage mapped across AQA, Edexcel, OCR, WJEC/Eduqas, Cambridge, IB, AP, and broader UK, US, and international systems - Interactive formula preview with intuition, derivations, rearrangements, mnemonics, comparisons, and step-by-step practice problem solutions EXPERT REVISION GUIDES - 170+ Expert Revision Guides built from formulas, derivations, rearrangements, mnemonics, intuition, history, and practice - 3 free sample guides on the free plan, with the full guide library available on paid plans - Extra spreadsheet, coding, and reference study packs for broader revision workflows 50+ INTERACTIVE GAMES - Equation Zillionaire, Solve It, Unit Crunch, Symbol Rush, Formula Run, Equation Sleuth, Logic Linker, and more - XP levels, daily streaks, achievement badges, and global leaderboards AI-POWERED TOOLS - AI Equation Mentor to explain, rearrange, and solve formulas step by step - AI Image Scanner to identify equations from photos - AI Study Tool, AI guide generation, and AI-assisted calculator building - AI spreadsheet and coding explainers for practical problem solving CREATE, PROGRESS, AND SCIENTISTS - Create page supports typing, uploading handwriting, or drawing equations before sending them through Store AI - Progress includes Equation Skill Check, weak-equation analytics, subject insights, and next-best-study actions - Separate scientist experiences: collect 100 scientist cards in Scientist Collection, then explore 800+ scientists on the broader Scientists Page - Expanded discovery pages, including Timeline and Wiki coverage, for richer browsing across topics and people REFERENCE AND LIFESTYLE TOOLS - Full Periodic Table, Physical Constants, Unit Conversions, Greek Alphabet, and Math Rules - 468+ Did You Know facts and equation-linked historical context - 6 lifestyle and finance calculators: Salary Cost-of-Living Adjuster, Portfolio Growth Planner, Mortgage Cost Planner, Rent vs Buy Comparator, Emergency Fund Planner, and Budget Split Planner PERFECT FOR GCSE, A-Level, IB, AP, university, finance professionals, developers, Excel users, and independent learners UI available in English plus 17 translated languages. Deeper formula, calculator, Excel, coding, and study content is localized across 10 translated data languages. PLANS - Free: full library access, sample Expert Revision Guides, games, and reference tools - Plus: GBP 5.99/month for unlimited saves, full Expert Revision Guide access, create tools, exports, and ad-free study - Pro: GBP 9.99/month for everything in Plus plus AI Mentor, Image Scanner, AI study workflows, and advanced creation tools - Ultra: GBP 14.99/month for everything in Pro plus the highest AI priority and heavier daily AI usage Zero ads on all paid plans. Terms of Use: https://equationencyclopedia.com/terms Privacy Policy: https://equationencyclopedia.com/privacy About Us: https://equationencyclopedia.com/about Idea illustrations by Storyset

Qedra is a step-by-step mathematics solver for university coursework, built on a computer algebra system that runs entirely on your device. WORKING YOU CAN HAND IN Every line of a derivation names the rule it applied — u-substitution, integration by parts, the power rule, Gauss-Jordan elimination — so the page reads like the working a course actually grades, not a black box that prints an answer. EXACT, NOT ROUNDED The engine is built on arbitrary-precision integers and exact fractions. A determinant comes back as -2, never as -2.0000000000000004. A radical stays a radical until you ask for a decimal. IT CHECKS ITS OWN DERIVATIONS Where supported, derivatives are checked numerically. Roots are substituted in. Antiderivatives are differentiated and compared. A derivation carries its verdict: verified, verified up to a constant, or — when the check genuinely cannot run, at a branch cut or a singularity — the named reason it could not. IT WOULD RATHER SAY LESS THAN SAY SOMETHING FALSE Ask most solvers to simplify the square root of x squared and they answer x. That is only true when x is not negative, and Qedra will not write it. Squaring both sides of a radical equation can add roots, so every candidate is substituted back into the original and the ones that fail are discarded, in front of you. An antiderivative that crosses a pole says so rather than pretending one constant covers both sides. IT REFUSES HONESTLY When something is out of range, Qedra says what it tried and why it stopped. It never invents a plausible answer, and it never silently gives up. WHAT IT SOLVES - Precalculus, algebra, equations and inequalities - Calculus I-III: limits, derivatives, integrals, partial derivatives, multiple integrals, vector calculus, and sums with closed forms - Linear algebra: determinants, inverses, row reduction, rank, eigenvalues — exact throughout - Discrete mathematics: primes, factorisation, gcd, modular arithmetic, combinatorics - Probability and statistics, complex arithmetic IN YOUR OWN LANGUAGE The explanations are translated, not only the interface. A derivation reads as mathematical prose in your language, with the terminology a lecturer would use — and the notation stays notation, left to right, in every script. INPUT THAT READS BACK A seven-page mathematics keyboard types real notation, and a live "read as" strip shows how your input was understood before you commit to it — so you can see that 1/2x was read the way you meant it. Decimal point or decimal comma, whichever your region uses. LaTeX in and LaTeX out. ALSO IN THE APP - History of what you have solved, with the notation settings frozen onto each entry - A reference library of the rules the solver cites, each stating its own hypotheses - Settings for what log means, angle units, and whether to work over the complex numbers COMPLETELY OFFLINE There is no account, no sign-up and no Qedra server. Your problems are never uploaded, because there is nowhere for them to go. The free tier shows one banner advert at the bottom of the Solve screen, and nothing you type is ever part of an advert request; Qedra Pro removes it. Put the device in airplane mode and every calculation still works. QEDRA PRO Free gives you unlimited answers, three full step-by-step derivations a day, and your last 100 problems in history. Qedra Pro removes both limits. - Monthly: $9.99 per month - Yearly: $59.99; 3-day free trial if eligible - Lifetime: $149.99 once, never renews Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Payment is charged to your Apple Account at confirmation of purchase. Manage or cancel in Settings > your Apple Account > Subscriptions. Prices are in US dollars and may vary by region. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://mwsupplylimited.github.io/qedra/privacy.html