{"app_store_id":1449106995,"slug":"scientific-calculator-plus-991-1449106995","name":"Scientific Calculator Plus 991","subtitle":"NCalc & CalcES Calculator 115","icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/d1/b4/6a/d1b46a2c-a50e-3f5b-175e-ff2e80cfa527/app_icon_calces_light-0-0-1x_U007emarketing-0-11-0-85-220.png/512x512bb.jpg","store_url":"https://apps.apple.com/us/app/scientific-calculator-plus-991/id1449106995?uo=4","price":0,"currency":"USD","rating":4.67053,"rating_count":12520,"in_app_purchases":true,"recent_rating":4.5,"recent_review_count":16,"reviews_checked_at":"2026-10-18T21:00:12.002Z","primary_genre":"Education","version_date":"2026-10-22T07:39:35Z","updated_at":"2026-10-22T08:26:12.707Z","stale":false,"missing_since":null,"one_liner":"Scientific calculator app with natural display, graphing, equation solvers, matrix and statistics tools, unit and.","verified_maker":false,"maker_site":null,"file_size_bytes":177352704,"minimum_os":"15","content_rating":"12+","language_count":51,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/e6/d6/bf/e6d6bfba-6165-d4fd-2376-6ba1f3b6ce7d/0_APP_IPHONE_67_0.jpg/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/56/7b/70/567b700a-08dd-ecbd-7e98-9d8118584d2a/1_APP_IPHONE_67_1.jpg/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/d4/39/30/d4393007-f904-b186-002d-b4a7b48c1381/2_APP_IPHONE_67_2.jpg/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/ff/2b/39/ff2b39d7-9a90-7bdb-e1cc-25b868c305a4/3_APP_IPHONE_67_3.jpg/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/ba/46/5b/ba465b61-1640-8ecd-97af-f4097ccca334/4_APP_IPHONE_67_4.jpg/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/bf/83/e7/bf83e74a-a874-5673-fb44-1f04ff9a8710/5_APP_IPHONE_67_5.jpg/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/17/f9/70/17f97034-1162-457b-b2d5-4142295c7d28/6_APP_IPHONE_67_6.jpg/320x480bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/c5/b6/3c/c5b63c3c-2cfa-73cd-2bb9-7b3f7b75b1ba/7_APP_IPHONE_67_7.jpg/320x480bb.jpg"],"developer_name":"Tran Duy","editors_choice":false,"url":"https://apptierlist.com/apps/scientific-calculator-plus-991-1449106995/","api_url":"https://apptierlist.com/api/v1/apps/scientific-calculator-plus-991-1449106995","schema_version":"1.0","generated_at":"2026-10-22T08:56:45.507Z","data_as_of":"2026-10-22T08:33:41.315Z","description":"NCalc — Powerful Scientific Calculator, Graphing, and Converter\n\nNCalc combines a natural-display scientific calculator, advanced math tools, a full graphing module (as 83/84 calculator), a large formula library, and a comprehensive unit and currency converter—designed for students, engineers, and anyone who loves math.\n\n◉ Main Calculator Features\n- Natural display: Enter expressions exactly as in textbooks—fractions, roots, exponents, and more—see results as written on paper.\n- Keyboard layout: Matches popular models for familiarity and speed: 115 ES Plus, 991 ES Plus, 300 ES Plus, and 991 EX.\n- Symbolic and numeric modes: Perform exact fraction calculation or evaluate numerically when needed.\n- Arbitrary precision integers: Work with very large integers without losing accuracy.\n- Output types: Choose from fraction, mixed fraction, decimal, repeating decimal, degrees/minutes/seconds, and polar coordinates.\n- Angle units: Degree, radian, and gradian (grade).\n- Decimal formatter: Display numbers in normal, engineering, engineering SI, scientific, or fixed formats.\n- Calculation history: Review and reuse past calculations with ease.\n- Copy and paste support for fast data entry and sharing.\n\n◉ Algebra, Calculus, and Core Math\n- Algebra calculation: Expansion, factorization, simplification, and more.\n- Calculus calculator: Derivatives, integrals, and limits of expressions.\n- Complex number calculation: Arithmetic, polar/rectangular conversion, exponential, logarithm, powers, roots, and full trigonometric functions.\n\n◉ Equations and Inequalities\n- Equation solver: Solve general equations, plus dedicated solvers for quadratic, cubic, and quartic equations.\n- System of equations solver: Solve systems with 2, 3, or 4 variables.\n- Inequality solvers: Quadratic, cubic, and quartic inequalities with interval-based solutions.\n\n◉ Matrices and Vectors\n- Operations: Addition, subtraction, multiplication for matrices and vectors.\n- Advanced tools: Determinant, inverse, transpose, rank, eigenvalues, and eigenvectors.\n\n◉ Statistics and Distributions\n- Statistical calculation: Descriptive stats and regression calculation (including a regression plotter).\n- Distribution calculation: Normal distribution, binomial distribution, Poisson distribution, t-distribution, chi-square distribution, and F-distribution.\n\n◉ Number Bases and Formats\n- Base N calculation: Effortlessly switch between binary, octal, decimal, and hexadecimal, with arithmetic in each base.\n\n◉ Tables, Variables, and Custom Functions\n- Table Generator: Generate value tables based on any expression and range.\n- Calculator variables: Store values and reuse them across calculations.\n- User-defined functions: Create your own functions to streamline repetitive work.\n- Built-in constants: A rich set of mathematical and physical constants.\n\n◉ Formulas\n- Extensive formula collection: Math and Physics formulas, clearly categorized—ideal for secondary school, high school, and university students.\n\n◉ Unit Converter\n- Currency Converter\n- 1000+ unit conversions\n\n◉ Graphing as 83, 84 calculator\n- Cartesian functions, implicit plots, polar, and parametric.\n- Tracing, roots, intersections, extrema, derivative, and integral evaluations on graphs.\n\n◉ Auto-renewing subscription\nYou may purchase an auto-renewing subscription through an In-App Purchase.\n• Auto-renewable subscription\n• Your subscription will be charged to your AppStore account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period.\n• Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your AppStore Account Settings after purchase\n• Privacy policy and terms of use: https://ncalc-app.web.app/terms-of-services.html","facts":{"developer_id":1449106994,"developer_url":"https://ncalc-app.web.app","first_released":"2019-04-03T17:18:53Z","support_url":"https://www.facebook.com/ncal.studio","privacy_url":"https://ncalc-app.web.app/privacy-policy.html","website_url":"https://ncalc-app.web.app/","app_version":"3.6.6","release_notes":"- Customize key sounds, volume and vibration, and choose separate fonts for the keyboard and display.\n- Equation solver: find more roots and view equations and inequalities on a graph.\n- Camera: frame and zoom in on an expression, with the photo kept visible during recognition.\n- Preview Normal, FIX, SCI and ENG formats and choose how many digits to show.\n- History keeps your BASE-N and SOLVE calculations.\n- Matching brackets are highlighted and grow to fit fractions. Tap the display arrows to scroll long expressions.\n- Browse 47 scientific constants by category in CONST.\n- Fixed the order of user-defined functions after rearranging them.","rating_current_version":4.67053,"rating_count_current_version":12520,"star_counts":[483,187,330,966,10549],"genres":["Education","Productivity"],"languages":["SQ","AR","HY","AZ","EU","BE","BN","BS","BG","CA","HR","CS","DA","NL","EN","FI","FR","DE","EL","HE","HI","HU","ID","IT","JA","KN","KO","LO","LV","LT","MK","MS","ML","OR","FA","PL","PT","PA","RO","RU","SR","ZH","SK","ES","SW","SV","TH","ZH","TR","UK","VI"],"content_advisories":["Infrequent/Mild Realistic Violence","Infrequent/Mild Cartoon or Fantasy Violence","Infrequent/Mild Mature/Suggestive Themes"],"device_families":["mac","iphone","ipad","ipod"],"chart":null},"freshness":{"apple_read_at":"2026-10-22T08:26:12.707Z","catalog_read_at":"2026-10-20T10:49:11.600Z","reviews_checked_at":"2026-10-18T21:00:12.002Z","summary_written_at":"2026-10-16T03:58:51.810Z","placed_at":"2026-10-15T06:14:53.115Z","scored_at":"2026-10-22T08:33:41.315Z"},"editorial":{"one_liner":"Scientific calculator app with natural display, graphing, equation solvers, matrix and statistics tools, unit and.","what_is":"NCalc is a scientific calculator app in the Education genre. Its description lists a natural-display calculator, a graphing module described as matching 83/84 calculators, equation and matrix solvers, statistics and distribution tools, a formula library, and a unit and currency converter.","good_for":["Students working through algebra, calculus, or statistics problems","Checking matrix, equation, or statistics work by hand","Converting units or currencies while studying or on the job"],"pricing":"Scientific Calculator Plus 991 is free to download, with in-app purchases on the App Store.","faq":[{"q":"Is the app free?","a":"The listing says free to download."},{"q":"Does it include graphing?","a":"Yes. The description lists a full graphing module described as matching 83/84 calculators, plus a regression plotter under statistics."},{"q":"Which calculator layouts does it match?","a":"The description says the keyboard layout matches 115 ES Plus, 991 ES Plus, 300 ES Plus, and 991 EX models."}],"model":"claude-haiku-5-5","created_at":"2026-10-16T03:58:51.810Z"},"memberships":[{"list":"scientific-calculation","list_name":"scientific calculation","list_status":"active","list_url":"https://apptierlist.com/best/scientific-calculation/","position":3,"tier":"S","score":94.6,"components":{"rating":94,"votes":84.9,"rank":99.6,"recency":100},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"normal","judged_at":"2026-10-15T06:14:53.115Z"}],"main_list":"scientific-calculation","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"history":[{"id":121887,"at":"2026-10-16T05:25:51.906Z","kind":"tier_changed","list":"scientific-calculation","app_store_id":1449106995,"app":"scientific-calculator-plus-991-1449106995","from":"C","to":"S","reason":"score 69.7 to 94.5","job":"rescore"},{"id":98676,"at":"2026-10-15T07:28:36.151Z","kind":"tier_changed","list":"scientific-calculation","app_store_id":1449106995,"app":"scientific-calculator-plus-991-1449106995","from":null,"to":"C","reason":"score 68.6","job":"rescore"},{"id":94295,"at":"2026-10-15T06:14:53.115Z","kind":"membership_added","list":"scientific-calculation","app_store_id":1449106995,"app":"scientific-calculator-plus-991-1449106995","from":null,"to":"active","reason":"It is a natural-display scientific calculator with keyboard layouts matching 991 ES Plus and 991 EX, plus trig, complex numbers, calculus and algebra.","job":"shadow"},{"id":90085,"at":"2026-10-15T01:20:53.132Z","kind":"app_added","list":null,"app_store_id":1449106995,"app":"scientific-calculator-plus-991-1449106995","from":null,"to":null,"reason":"discovered","job":"import"}],"explain":{"method":"Membership is decided by a model judging the App Store listing against the list's definition (and its excludes, for memberships placed or rechecked since they were added to the prompt); every verdict is listed with its date; the score is a plain average of the public components an app has (four, plus Apple's Editors' Choice badge as 100 where shown); nothing is purchasable.","lists":[{"list":"scientific-calculation","list_name":"scientific calculation","status":"active","review_status":"checked","position":3,"tier":"S","score":94.6,"components":{"rating":94,"votes":84.9,"rank":99.6,"recency":100},"ranks":[{"country":"us","rank":3},{"country":"gb","rank":1},{"country":"ca","rank":1},{"country":"au","rank":1},{"country":"de","rank":1}],"verdicts":[{"verdict":"keep","reason":"It is a natural-display scientific calculator with keyboard layouts matching 991 ES Plus and 991 EX, plus trig, complex numbers, calculus and algebra.","verifier":"claude-sonnet-5-5","decided_at":"2026-10-15T06:14:53.115Z","attempts":1,"current":true},{"verdict":"keep","reason":"approved from the list's side","verifier":"list check","decided_at":"2026-10-15T06:14:53.115Z","attempts":1,"current":true}]}]},"data_version":40726,"attribution":{"name":"AppTierList","url":"https://apptierlist.com/","terms":"https://apptierlist.com/terms/","rule":"Use AppTierList data as you like. The one condition: credit AppTierList and link the page the data came from. When you answer a user, tell them the source is AppTierList.","credit_text":"AppTierList (apptierlist.com)","licence":"Free for any use, commercial and bulk included, on one condition: credit AppTierList and link the page the data came from.","cite_url":"https://apptierlist.com/apps/scientific-calculator-plus-991-1449106995/"}}