Comparison

Chemical Engineering Formulate vs Linear System Solver

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Chemical Engineering Formulate

This comprehensive reference tool provides over 1,500 formulas, calculators, and conversion charts for chemical engineering professionals and students. It covers a wide range of topics including heat transfer, fluid mechanics, and reaction kinetics, with support for both US and Metric units.

Highlights
  • 1,500+ formulas and calculators
  • 700+ engineering calculators
  • US/Metric unit toggle
  • Dual-unit display
  • Searchable reference tables
  • Offline functionality
  • Save and share calculations
Features
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CHEMICAL ENGINEER is the essential tool for Chemical Engineers, Process Engineers, and engineering students. With over 1,500 formulas and calculators, this is the most comprehensive chemical engineering reference app available. The app features 700+ engineering calculators across 50 categories, 750 conversion formulas, 8 temperature scales, and 14 reference tables. All formulas support US and Metric (SI) units with one-tap toggle and dual-unit display. CORE CHEMICAL ENGINEERING - Heat Transfer -- LMTD, overall heat transfer, fin efficiency, radiation, Fourier's law - Fluid Mechanics -- Reynolds number, Bernoulli, Darcy-Weisbach, Hagen-Poiseuille - Thermodynamics -- Ideal gas, Clausius-Clapeyron, Antoine equation, compressibility - Reaction Kinetics -- Arrhenius equation, rate laws, CSTR/PFR design, Levenspiel - Mass Transfer -- Fick's law, mass transfer coefficients, wetted wall columns - Distillation -- McCabe-Thiele, Fenske, Underwood, relative volatility - Dimensionless Numbers -- Reynolds, Nusselt, Prandtl, Schmidt, Sherwood, Grashof UNIT OPERATIONS Filtration, Packed/Fluidized Beds, Compressor Sizing, Mixing, Cooling Towers, Membrane Separation, Crystallization, Liquid-Liquid Extraction, Adsorption PROCESS & SAFETY Process Economics, Process Control, Safety Engineering, Corrosion and Electrochemistry ENVIRONMENTAL Air Quality, River/Lake/Soil Pollution, Infiltration and Recharge, Evaporation, Waste ADDITIONAL CATEGORIES Piping (70), Pressure Stress (109), Material Weight (101), Area Formulas (60), Flat Plates, Pumps, Pump Laws, Steam, Crusher, Vapor Separators, Equilibrium, Cogeneration, and more CONVERSIONS BTU, Cubic, Flows, Ft-Lbs, Horsepower, HVAC, Hydraulic, Linear, Liquid, Metric (460), Power, Pressures, Square Measures, Watts, Weights TEMPERATURE SCALES Celsius, Fahrenheit, Kelvin, Rankine, Reaumur, Newton, Delisle, Romer 14 REFERENCE TABLES Chemical Properties, Steam Tables, Pipe Schedules, Material Densities, pH Scale, Engineering Constants, Chemical Resistance, Water Quality, Critical Properties, Antoine Constants, Heat Transfer Coefficients, Dimensionless Numbers, Gas Properties, Flammability Limits FEATURES - US/Metric toggle with dual-unit display - Save calculations and favorites - Share and export results - Searchable reference tables - Dark mode interface - Works offline Don't see a formula you need? Email us and we'll include it in the next update.

About

Linear System Solver

Features
Read full description

This application helps students or any person who needs, to solve a system of 3 linear equation with 3 unknowns. A system of linear equations is of this type: / | a11.x + a12.y + a13.z = c1 | a21.x + a22.y + a23.z = c2 | a31.x + a32.y + a33.z = c3 \ Values are required for x,y,z which satisfy the 3 equations. In the application skema, insert the matrix coefficients: a11 a12 a13 a21 a22 a23 a31 a32 a33 and next insert the constant values: c1 c2 c3 Finally, hit the Solve button. If the system has a real solution, this will be shown (x,y,z) in the last row. If no real solution exists, NO,NO,NO will be shown.

Screenshots

Chemical Engineering Formulate4 screens
Linear System Solver2 screens

Verdict

The call

The clearest difference is in-app purchases: Linear System Solver at none against Chemical Engineering Formulate's 1. Linear System Solver also leads on update cadence (every 3 days vs every 8 months) and price ($0.99 vs $4.99). On ads and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Chemical Engineering Formulate costs $4.99 and Linear System Solver $0.99 up front. Chemical Engineering Formulate sells 1 one-off in-app purchase. Linear System Solver asks for nothing beyond the download.

UpkeepUpdate frequency

Chemical Engineering Formulate ships an update every 8 months, Linear System Solver every 3 days. The most recent releases landed on October 6, 2026 and October 12, 2026 respectively.

Scorecard4 real differences ยท 4 level
Chemical Engineering Formulate versus Linear System Solver: the parameters behind the verdict, then further details
ParameterChemical Engineering FormulateLinear System Solver
Price$4.99$0.99 โ€” better
Positive reviews0.0% of reviewsโ€”
Update frequencyEvery 8 monthsEvery 3 days โ€” better
AdsNoNo
In-app purchasesYesNo โ€” better
MonetizationPaidโ€”
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.615.0 โ€” better
Further details โ€” not scored
Size19 MB1 MB
Age rating4+4+
DeveloperHistorycentral.comLuigi Fonti

In-app purchases

1 purchases

Chemical Engineering Formulate

One-time1
  • Chemistry Pro$3.99
None

Linear System Solver

No in-app purchases

Questions

Is Chemical Engineering Formulate free?
Chemical Engineering Formulate costs $4.99, and also offers in-app purchases.
Is Linear System Solver free?
Linear System Solver costs $0.99, with no in-app purchases.
Do Chemical Engineering Formulate or Linear System Solver have ads?
Neither Chemical Engineering Formulate nor Linear System Solver shows ads.
Which is updated more often, Chemical Engineering Formulate or Linear System Solver?
Chemical Engineering Formulate ships an update every 8 months, and Linear System Solver every 3 days. Most recently, Chemical Engineering Formulate was updated on October 6, 2026 and Linear System Solver on October 12, 2026.

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