Comparison

Attendly by Coding Ladies 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

Attendly by Coding Ladies

Features
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Attendly by Coding Ladies is an attendance and event management app designed to make community participation simple and organized. The app supports both leaders and members, making it easy to manage, verify, and record attendance for trainings, meetings, and events. Key Features: QR check-ins for quick and secure attendance Leader tools for attendance verification and records Event listings for upcoming trainings and activities Notifications and updates for members Easy access across chapters and groups Attendly helps Coding Ladies Academy leaders and members stay connected, informed, and engaged — all in one place. Stay organized. Stay involved. Attendly by Coding Ladies.

About

Engineering Formulas

Features
Read full description

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

Attendly by Coding Ladies4 screens
Engineering Formulas4 screens

Verdict

The call

The clearest difference is in-app purchases: Attendly by Coding Ladies at none against Engineering Formulas's 3. Engineering Formulas's advantage is update cadence (every 2 months vs every 6 months). On price, ads, device support and iOS requirement 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. Attendly by Coding Ladies asks for nothing beyond the download.

UpkeepUpdate frequency

Attendly by Coding Ladies ships an update every 6 months, Engineering Formulas every 2 months. The most recent releases landed on October 7, 2026 and October 4, 2026 respectively.

Scorecard2 real differences Ā· 4 level
Attendly by Coding Ladies versus Engineering Formulas: the parameters behind the verdict, then further details
ParameterAttendly by Coding LadiesEngineering Formulas
PriceFreeFree
Update frequencyEvery 6 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.115.1
Further details — not scored
Size37 MB45 MB
Age rating17+12+
DeveloperClaude AmaduMobin Akhter

In-app purchases

None

Attendly by Coding Ladies

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 Attendly by Coding Ladies free?
Attendly by Coding Ladies 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 Attendly by Coding Ladies or Engineering Formulas have ads?
Neither Attendly by Coding Ladies nor Engineering Formulas shows ads.
Which is updated more often, Attendly by Coding Ladies or Engineering Formulas?
Attendly by Coding Ladies ships an update every 6 months, and Engineering Formulas every 2 months. Most recently, Attendly by Coding Ladies was updated on October 7, 2026 and Engineering Formulas on October 4, 2026.

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