ENGX vs Engineering Formulas
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
ENGX
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ENGX ูู ุจุฑูุงู ุฌ ููุฏุณู ุชููู ูุฏูู ุงูุชุนูู ูู ู ุฌุงู ุงูู ููุงูููุง ูุฎุงุตุฉ ูู ู ูุงูุญุฉ ุงูุญุฑุงุฆู ูุชูููู ุงูููุงุก ููุทุน ุงูุบูุงุฑุ ูุชุนููู ูุชุฃููู ุงูุทูุงุจ ุญุชู ูุชู ูููุง ู ู ุงูุนู ู ุจููุงุกุฉ ุฏุงุฎู ุณูู ุงูุนู ู.
Engineering Formulas
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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: โข Mechanical Engineering: stress, strain, torque, power, gear ratios, spring design โข Electrical Engineering: Ohm's law, AC/DC circuits, impedance, resonance โข Civil/Structural: beam deflection, Euler buckling, Manning's equation โข Thermodynamics: ideal gas law, Carnot efficiency, heat transfer โข Fluid Mechanics: Bernoulli, Reynolds number, Darcy-Weisbach โข 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: โข Carbon steels (AISI 1018, 1045, 4140, 4340) โข Stainless steels (304, 316, 17-4 PH) โข Aluminum alloys (6061-T6, 7075-T6, 2024-T3) โข Titanium, copper, nickel alloys โข Plastics (ABS, HDPE, Nylon, PEEK, Delrin) โข Composites, concrete, and wood Compare up to 3 materials side-by-side with density, tensile strength, elastic modulus, thermal conductivity, and more. REFERENCE TABLES โข Bolt specifications: Metric M3-M36, SAE/Imperial sizes โข Pipe schedules: NPS dimensions and wall thickness โข 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 โข Dark and light themes (follows system setting) โข Favorites to bookmark frequently used formulas โข Calculation history with timestamps โข Create and save custom formulas โข Export and share your data โข LaTeX formula rendering โข 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/
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Verdict
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
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.
ENGX ships an update fortnightly, Engineering Formulas every 2 months. The most recent releases landed on September 29, 2026 and October 4, 2026 respectively.
| Parameter | ENGX | Engineering Formulas |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly โ better | Every 2 months |
| Ads | No | No |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPod | iPhone, iPad, iPod โ better |
| Requires iOS | 15.6 | 15.1 โ better |
| Further details โ not scored | ||
| Size | 84 MB | 45 MB |
| Age rating | 4+ | 12+ |
| Developer | Amr Mesbah | Mobin Akhter |
In-app purchases
ENGX
No in-app purchases
Engineering Formulas
- Weekly Premium$4.997 Days
- Yearly Premium$29.991 Year
- Lifetime Access$54.99
Questions
Is ENGX free?
Is Engineering Formulas free?
Do ENGX or Engineering Formulas have ads?
Which is updated more often, ENGX or Engineering Formulas?
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