Comparison

Engineering Interview Questions and Answers vs Engineering Formulas

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

Head to head
About

Engineering Interview Questions and Answers

Features
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This app has the largest collection of engineering questions and answers for Technical Interview, Campus Interview and Placement Tests. You can find Interview Questions and Answers of Following Branch - MECHANICAL Engineering - CIVIL Engineering (CE) - ELECTRICAL Engineering (EEE) - CHEMICAL Engineering - AUTOMOBILE Engineering - COMPUTER SCIENCE ENGINEERING (CSE) - Electronics & Communications (ECE) - MINING Engineering - Aeronautical Engineering - Bio Engineering - Energy Oil Gas - Industrial Engineering - Instrumentation Engineering - Marine Engineering - Mechatronics Engineering - NETWORK ENGINEER - ELECTRONICS

About

Engineering Formulas

Features
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EngiRef is the all-in-one engineering reference app that works 100% offline. Access formulas, material properties, reference tables, and a powerful unit converter - all without internet connection. FORMULA LIBRARY Browse 140+ essential engineering formulas organized by discipline: • Mechanical Engineering: stress, strain, torque, power, gear ratios, spring design • Electrical Engineering: Ohm's law, AC/DC circuits, impedance, resonance • Civil/Structural: beam deflection, Euler buckling, Manning's equation • Thermodynamics: ideal gas law, Carnot efficiency, heat transfer • Fluid Mechanics: Bernoulli, Reynolds number, Darcy-Weisbach • Materials Science: Young's modulus, Poisson's ratio, fatigue analysis BUILT-IN CALCULATOR Enter your values and get instant results. Every calculation shows step-by-step solutions so you understand the process, not just the answer. Perfect for learning and exam preparation. MATERIALS DATABASE Access properties for 55+ engineering materials: • Carbon steels (AISI 1018, 1045, 4140, 4340) • Stainless steels (304, 316, 17-4 PH) • Aluminum alloys (6061-T6, 7075-T6, 2024-T3) • Titanium, copper, nickel alloys • Plastics (ABS, HDPE, Nylon, PEEK, Delrin) • Composites, concrete, and wood Compare up to 3 materials side-by-side with density, tensile strength, elastic modulus, thermal conductivity, and more. REFERENCE TABLES • Bolt specifications: Metric M3-M36, SAE/Imperial sizes • Pipe schedules: NPS dimensions and wall thickness • Wire gauges: AWG 0000-40 with ampacity ratings UNIT CONVERTER Convert between 16 categories including length, pressure, temperature, force, energy, flow rate, and viscosity. Accessible from any screen via slide-over panel. PHYSICAL CONSTANTS Quick reference for 34 constants including speed of light, gravitational constant, Boltzmann constant, Avogadro's number, and more. QUIZ MODE Test your knowledge with flashcard-style quizzes. Track progress across all disciplines. Prepare for FE and PE exams. ADDITIONAL FEATURES • Dark and light themes (follows system setting) • Favorites to bookmark frequently used formulas • Calculation history with timestamps • Create and save custom formulas • Export and share your data • LaTeX formula rendering • iPad-optimized layouts PRIVACY FOCUSED EngiRef collects zero personal data. No analytics, no ads. All your calculations and favorites stay on your device. We believe engineering tools should respect your privacy. Whether you are a student preparing for exams, a working engineer needing quick field reference, or a technician looking for material specs, EngiRef puts essential engineering knowledge in your pocket. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Engineering Interview Questions and Answers4 screens
Engineering Formulas4 screens

Verdict

The call

The clearest difference is in-app purchases: Engineering Interview Questions and Answers at none against Engineering Formulas's 3. Engineering Interview Questions and Answers also leads on iOS requirement (6.0 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

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

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Engineering Formulas sells 3 in-app purchases, starting at $4.99 per 7 days. Engineering Interview Questions and Answers asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 8, 2026 and October 20, 2026 respectively.

Scorecard2 real differences Ā· 4 level
Engineering Interview Questions and Answers versus Engineering Formulas: the parameters behind the verdict, then further details
ParameterEngineering Interview Questions and AnswersEngineering Formulas
PriceFreeFree
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS6.0 — better15.1
Further details — not scored
Size12 MB45 MB
Age rating4+12+
Developerrahul bawejaMobin Akhter

In-app purchases

None

Engineering Interview Questions and Answers

No in-app purchases

3 purchases

Engineering Formulas

Subscriptions2
  • Weekly Premium$4.997 Days
  • Yearly Premium$29.991 Year
One-time1
  • Lifetime Access$54.99

Questions

Is Engineering Interview Questions and Answers free?
Engineering Interview Questions and Answers is free to download, with no in-app purchases.
Is Engineering Formulas free?
Engineering Formulas is free to download, with in-app purchases available.
Do Engineering Interview Questions and Answers or Engineering Formulas have ads?
Neither Engineering Interview Questions and Answers nor Engineering Formulas shows ads.
Which is updated more often, Engineering Interview Questions and Answers or Engineering Formulas?
Engineering Interview Questions and Answers ships an update every 2 months, and Engineering Formulas every 2 months. Most recently, Engineering Interview Questions and Answers was updated on October 8, 2026 and Engineering Formulas on October 20, 2026.

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