Comparison

OTP Auth vs VoltCalc Electrical App

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

Head to head
About

OTP Auth

Generate and manage two-factor authentication codes offline. Organize accounts with custom groups, search, and widgets. Securely store keys and choose your preferred protection methods.

Highlights
  • Offline code generation
  • QR code scanning
  • Custom account groups
  • Search functionality
  • Home Screen and Lock Screen widgets
  • Apple Watch app
  • Biometric app lock
Features
Read full description

Keep your two-factor codes in one place. OTP Auth is an authenticator for iPhone and iPad that generates verification codes offline and helps you find the right account with groups and search. Generate codes, even offline • Add accounts by scanning a QR code, reading one from an image, or entering a setup key manually. • Generate TOTP and HOTP codes without an internet connection after setup. • See the countdown for time-based codes and tap to copy. Keep accounts organized • Separate work and personal accounts with custom groups. • Drag to reorder and search by name. • Choose icon symbols and colors, with light and dark themes. Codes within reach • View TOTP codes in Home Screen and Lock Screen widgets, or on Apple Watch. • Search accounts and add favorites on Apple Watch. • Lock Screen widgets require iOS 16 or later. Choose your protection • Authentication keys are stored in the device's system Keychain. • Enable the Face ID or Touch ID app lock and choose to hide codes by default. Premium: sync, back up and transfer The following features require an in-app purchase: • iCloud sync: sync authentication accounts between devices. • Encrypted backups: export a password-protected backup and import it when moving to a new device. • Account transfers: import supported authenticator backup files or transfer QR codes. • Service logos: match accounts with their services' icons. Code generation, QR setup, groups, search, icon symbols and colors, widgets, and Apple Watch features are free to use. Works with websites and services that support TOTP or HOTP. Enable two-factor authentication with the service before adding its account to OTP Auth.

About

VoltCalc Electrical App

Features
Read full description

VoltCalc The Ultimate Professional Electrical Calculator Throw away your clunky, outdated engineering apps. VoltCalc: Electrical App is the modern, lightning-fast utility designed specifically for professional electricians, electrical engineers, contractors, and students. Whether you are wiring a residential grid in the USA, calculating commercial loads in the UK, or managing industrial conduit fills in Kuwait, VoltCalc delivers pinpoint mathematical accuracy directly from your pocket. We analyzed the daily workflow of master electricians to build an electrical calculator that actually works on the job site. No internet required, no intrusive mid-calculation interruptions, and a premium Dark Mode that saves your battery while working in dark basements or unlit construction zones. BUILT FOR GLOBAL ENGINEERING STANDARDS - Seamlessly switch between regional electrical codes with a single tap: - US & North America: Full support for AWG (American Wire Gauge), NEC standards, inches, and feet. - UK, Europe & Middle East: Instant toggle to Metric parameters (mm², meters) compliant with IEC electrical standards. CORE ELECTRICAL CALCULATORS & TOOLS VoltCalc is packed with every formula an electrician needs, automated for instant results: - Voltage Drop Calculator: Accurately calculate voltage drop across copper and aluminum conductors. Ensure your circuits meet code regulations over long distances. - Wire Size & Ampacity Calculator: Find the exact wire gauge (AWG or Metric) required for your specific load, voltage, and cable length. - Ohm’s Law Calculator: Instantly solve for Voltage (V), Current (I), Resistance (R), and Power (P). Just enter two known values, and the app calculates the rest. - Power & Energy Formulas: Convert seamlessly between Watts, Kilowatts (kW), kVA, Amps, and Volts for both Single Phase (1-Phase) and Three Phase (3-Phase) electrical systems. - Conduit Fill Calculator: Determine the exact pipe size needed for your wire pulls without the guesswork. PREMIUM JOB-SITE UTILITY - 100% Offline Functionality: Deep underground or in a remote construction site with zero cellular signal? VoltCalc works entirely offline so your workflow never stops. - Native Dark Mode: A sleek, high-contrast black UI designed to reduce eye strain and maximize your device's battery life on long 12-hour shifts. - Clean, Uncluttered Interface: Ditch the frustrating menus. Get to the exact circuit calculator you need in two taps. Whether you are troubleshooting a tricky residential circuit, studying for your master electrician exam, or running massive industrial power calculations, VoltCalc is the only electrical engineering app you will ever need. Payment & Subscription: - You can choose our plans and get unlimited access to all the features of the App. Ad free experience for a month USD 0.99 Ad free experience for a year USD 5.99 You can cancel your subscription anytime, to cancel subscription follow these steps on your iPhone/iPad Go to Settings > click on Your Name > Subscriptions > In Active section > VoltCalc Electrical App > Cancel Subscription >Confirm Cancellation EULA: https://howtodelete.weebly.com/privacy-policy.html Download VoltCalc: Electrical App today and power up your workflow!

Screenshots

OTP Auth4 screens
VoltCalc Electrical App4 screens

Verdict

The call

The clearest difference is device support: OTP Auth at 4 against VoltCalc Electrical App's 2. On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. OTP Auth sells 1 one-off in-app purchase and VoltCalc Electrical App sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Scorecard1 real difference · 9 level
OTP Auth versus VoltCalc Electrical App: the parameters behind the verdict, then further details
ParameterOTP AuthVoltCalc Electrical App
PriceFreeFree
Rating3.4 (19 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings19 — better—
Update frequencyEvery 6 months—
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad
Requires iOS15.0 — better16.6
Further details — not scored
Size11 MB30 MB
Age rating4+4+
Developer浩 王BMAC Infotech

In-app purchases

1 purchases

OTP Auth

One-time1
  • OTPAuth Premium$1.99
2 purchases

VoltCalc Electrical App

Subscriptions2
  • Monthly3 Days trial$0.991 Month
  • Yearly3 Days trial$5.991 Year

Questions

Is OTP Auth free?
OTP Auth is free to download, with in-app purchases available.
Is VoltCalc Electrical App free?
VoltCalc Electrical App is free to download, with in-app purchases available.
Do OTP Auth or VoltCalc Electrical App have ads?
Neither OTP Auth nor VoltCalc Electrical App shows ads.

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