Comparison

Engineering Formulas vs ML Engineer Pro Prep

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

Head to head
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/

About

ML Engineer Pro Prep

Features
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This application is an independent exam preparation resource and is not affiliated with, endorsed by, sponsored by, or associated with Google LLC or any of its subsidiaries. GCP-MLE (Google Cloud Professional Machine Learning Engineer) is a registered trademark of Google LLC. Prepare confidently for the Google Professional ML Engineer (GCP-MLE) exam. GCP-MLE Practice provides hundreds of carefully crafted practice questions. ā—† COMPREHENSIVE COVERAGE • practice sets covering all exam domains ā—† REALISTIC EXAM EXPERIENCE • Timed practice mode simulating the 120-minute exam • Single and multiple-choice questions in exam format • Exam readiness score to track your progress ā—† SMART STUDY TOOLS • Detailed explanations for every question • Spaced-repetition flashcards powered by FSRS algorithm • Bookmarks for quick review • Personal notes on any question • Per-domain accuracy to identify weak areas ā—† MULTILINGUAL • Available in English, Japanese, Korean, German, and Portuguese ā—† PRIVACY & OFFLINE • Works completely offline — no internet required • No ads, no tracking Start with free practice sets. Unlock all sets with a one-time purchase.

Screenshots

Engineering Formulas4 screens
ML Engineer Pro Prep4 screens

Verdict

The call

The clearest difference is update cadence: ML Engineer Pro Prep at every 3 weeks against Engineering Formulas's every 2 months. ML Engineer Pro Prep also leads on iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases 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 and ML Engineer Pro Prep sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Engineering Formulas ships an update every 2 months, ML Engineer Pro Prep every 3 weeks. The most recent releases landed on October 4, 2026 and October 2, 2026 respectively.

Scorecard2 real differences Ā· 4 level
Engineering Formulas versus ML Engineer Pro Prep: the parameters behind the verdict, then further details
ParameterEngineering FormulasML Engineer Pro Prep
PriceFreeFree
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.113.0 — better
Further details — not scored
Size45 MB84 MB
Age rating12+4+
DeveloperMobin AkhterAITYTECH

In-app purchases

3 purchases

Engineering Formulas

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

ML Engineer Pro Prep

One-time1
  • Premium - Lifetime$3.99

Questions

Is Engineering Formulas free?
Engineering Formulas is free to download, with in-app purchases available.
Is ML Engineer Pro Prep free?
ML Engineer Pro Prep is free to download, with in-app purchases available.
Do Engineering Formulas or ML Engineer Pro Prep have ads?
Neither Engineering Formulas nor ML Engineer Pro Prep shows ads.
Which is updated more often, Engineering Formulas or ML Engineer Pro Prep?
Engineering Formulas ships an update every 2 months, and ML Engineer Pro Prep every 3 weeks. Most recently, Engineering Formulas was updated on October 4, 2026 and ML Engineer Pro Prep on October 2, 2026.

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