Comparison

ENGX vs Engineering Formulas

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

Head to head
About

ENGX

Features
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ENGX ู‡ูˆ ุจุฑู†ุงู…ุฌ ู‡ู†ุฏุณูŠ ุชู‚ู†ูŠ ู‡ุฏูู‡ ุงู„ุชุนู„ู… ููŠ ู…ุฌุงู„ ุงู„ู…ูŠูƒุงู†ูŠูƒุง ูˆุฎุงุตุฉ ููŠ ู…ูƒุงูุญุฉ ุงู„ุญุฑุงุฆู‚ ูˆุชูƒูŠูŠู ุงู„ู‡ูˆุงุก ูˆู‚ุทุน ุงู„ุบูŠุงุฑุŒ ูˆุชุนู„ูŠู… ูˆุชุฃู‡ูŠู„ ุงู„ุทู„ุงุจ ุญุชู‰ ูŠุชู…ูƒู†ูˆุง ู…ู† ุงู„ุนู…ู„ ุจูƒูุงุกุฉ ุฏุงุฎู„ ุณูˆู‚ ุงู„ุนู…ู„.

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: โ€ข Mechanical Engineering: stress, strain, torque, power, gear ratios, spring design โ€ข Electrical Engineering: Ohm's law, AC/DC circuits, impedance, resonance โ€ข Civil/Structural: beam deflection, Euler buckling, Manning's equation โ€ข Thermodynamics: ideal gas law, Carnot efficiency, heat transfer โ€ข Fluid Mechanics: Bernoulli, Reynolds number, Darcy-Weisbach โ€ข 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: โ€ข Carbon steels (AISI 1018, 1045, 4140, 4340) โ€ข Stainless steels (304, 316, 17-4 PH) โ€ข Aluminum alloys (6061-T6, 7075-T6, 2024-T3) โ€ข Titanium, copper, nickel alloys โ€ข Plastics (ABS, HDPE, Nylon, PEEK, Delrin) โ€ข Composites, concrete, and wood Compare up to 3 materials side-by-side with density, tensile strength, elastic modulus, thermal conductivity, and more. REFERENCE TABLES โ€ข Bolt specifications: Metric M3-M36, SAE/Imperial sizes โ€ข Pipe schedules: NPS dimensions and wall thickness โ€ข 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 โ€ข Dark and light themes (follows system setting) โ€ข Favorites to bookmark frequently used formulas โ€ข Calculation history with timestamps โ€ข Create and save custom formulas โ€ข Export and share your data โ€ข LaTeX formula rendering โ€ข 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

ENGX3 screens
Engineering Formulas4 screens

Verdict

The call

The clearest difference is in-app purchases: ENGX at none against Engineering Formulas's 3. ENGX also leads on update cadence (fortnightly vs every 2 months). On price, ads, device support and iOS requirement 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

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

UpkeepUpdate frequency

ENGX ships an update fortnightly, Engineering Formulas every 2 months. The most recent releases landed on September 29, 2026 and October 4, 2026 respectively.

Scorecard2 real differences ยท 4 level
ENGX versus Engineering Formulas: the parameters behind the verdict, then further details
ParameterENGXEngineering Formulas
PriceFreeFree
Update frequencyFortnightly โ€” betterEvery 2 months
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPodiPhone, iPad, iPod โ€” better
Requires iOS15.615.1 โ€” better
Further details โ€” not scored
Size84 MB45 MB
Age rating4+12+
DeveloperAmr MesbahMobin Akhter

In-app purchases

None

ENGX

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 ENGX free?
ENGX 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 ENGX or Engineering Formulas have ads?
Neither ENGX nor Engineering Formulas shows ads.
Which is updated more often, ENGX or Engineering Formulas?
ENGX ships an update fortnightly, and Engineering Formulas every 2 months. Most recently, ENGX was updated on September 29, 2026 and Engineering Formulas on October 4, 2026.

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