Comparison

Authenticator App vs Ruler

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

Head to head
About

Authenticator App

This app generates secure two-factor authentication tokens to protect your online accounts. It offers encrypted cloud backups and multi-device synchronization for easy recovery and access. The app works offline and can be secured with a PIN or biometric lock.

Highlights
  • Secure 2FA token generation
  • Encrypted cloud backups
  • Multi-device synchronization
  • Offline functionality
  • PIN and biometric lock
Features
Read full description

Authenticator App: 2FA・MFA・OTP delivers secure two-factor authentication codes for your accounts, keeping your online services protected with reliable TOTP generation. Simple, fast, and privacy-focused — perfect for securing logins without internet dependency. Key Features: - Generate TOTP codes for your accounts - Easy QR code scanning for quick account setup - Biometric security with Face ID or Touch ID - Secure cloud backup and data recovery - Offline functionality for use anywhere - Minimalist design for instant access Stay protected across all your services with Authenticator App: 2FA・MFA・OTP — your trusted companion for effortless account security. Payment will be charged to the credit card connected to your iTunes Account when you confirm the initial subscription purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period. Your account will be charged for renewal within 24-hours prior to the end of the current period, and the cost of the renewal will be identified. You may manage your subscription and auto-renewal may be turned off by going to your Account Settings after the purchase. Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription, where applicable. Terms of Use & Privacy Policy: https://docs.google.com/document/d/1-bRMtRSuH0pLoMZIwI69CA441mkxM0Cj0xaw91mEhTA/edit?usp=sharing https://docs.google.com/document/d/1-V6vBYQxi7tUSy_X5TVwc6skbLVyXHrjANNyCwFCOHU/edit?usp=sharing

About

Ruler

Transform your phone into a precise measuring tool. Accurately measure objects, surfaces, and distances using your screen or camera. Ideal for home, work, or on-the-go tasks, providing quick and reliable measurements.

Highlights
  • Measure objects on screen
  • Switch between units (cm, mm, inches)
  • Save and share measurements
  • Easy-to-use interface
  • Accurate and fast measurements
Features
Read full description

Turn your phone into a powerful measuring device with our app. Measure objects, surfaces, and distances precisely using your screen or camera. Whether you’re at home, at work, or on the go — our product gives you accurate measurements in seconds. Main Features: • Measure objects directly on your screen • Switch between units (cm, mm, inches) • Save and share your measurements • Sleek and easy-to-use interface Why You’ll Love It: • Always have a ruler in your pocket • Ideal for DIY, design, school, or daily use • Accurate, fast, and convenient Subscription Details: • Weekly Plan: $4.99/week • Yearly Plan: $19.99/year with a 3-day free trial Payment will be charged to your iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours before the subscription ends. Manage or cancel your subscription anytime in your iTunes Account settings. Any unused portion of a free trial will be forfeited when a subscription is purchased. Privacy Policy: https://www.icloud.com/pages/06esymWNjEpTQKyTyk7xrSiLQ#Blank Terms of Use: https://www.icloud.com/pages/0b4ufgCLIPuBpn14hhoiELQOA#Blank_3

Screenshots

Authenticator App4 screens
Ruler4 screens

Verdict

The call

The clearest difference is rating: Ruler at 5.0 against Authenticator App's 4.3. Ruler also leads on update cadence (every 2 days vs every 8 months). Authenticator App's advantage is monetization model (free with in-app purchases vs subscription) and ratings volume (214 vs 5). On price, ads, in-app purchases and device support 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. Authenticator App sells 10 in-app purchases, starting at $4.99 per 7 days and Ruler sells 7 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Ruler holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Authenticator App has 214 ratings behind it against 5, so its average is the more settled of the two.

UpkeepUpdate frequency

Authenticator App ships an update every 8 months, Ruler every 2 days. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 6 level
Authenticator App versus Ruler: the parameters behind the verdict, then further details
ParameterAuthenticator AppRuler
PriceFreeFree
Rating4.3 (214 ratings)5.0 (5 ratings) — better
Positive reviews61.5% of reviews—
Number of ratings214 — better5
Update frequencyEvery 8 monthsEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterSubscription
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS1716.0 — better
Further details — not scored
Size48 MB27 MB
Age rating4+4+
DeveloperAuthentication ServicesMyroslav Drozd

In-app purchases

10 purchases

Authenticator App

Subscriptions10
  • Digital Security Authenticator3 Days trial$4.997 Days
  • Enhance online security3 Days trial$5.997 Days
  • Smart Authenticator3 Days trial$6.997 Days
Show 7 more
  • Secure Code Generator3 Days trial$7.997 Days
  • 2FA App$14.991 Month
  • Secure Verification Generator3 Days trial$19.991 Month
  • Account protection Authenticator3 Days trial$29.991 Month
  • Secure your accounts$39.991 Year
  • Safe Login Code Generator3 Days trial$49.991 Year
  • One-Time Password$59.991 Year
7 purchases

Ruler

Subscriptions7
  • Smart Ruler3 Days trial$2.997 Days
  • Smart Ruler3 Days trial$4.997 Days
  • Smart Ruler3 Days trial$6.997 Days
Show 4 more
  • Smart Ruler$9.991 Year
  • Smart Ruler$14.991 Year
  • Smart Ruler$19.991 Year
  • Smart Ruler$24.991 Year

Questions

Is Authenticator App free?
Authenticator App is free to download, with in-app purchases available.
Is Ruler free?
Ruler is free to download, with in-app purchases available.
Which has better reviews, Authenticator App or Ruler?
Ruler is rated higher. Authenticator App averages 4.3 out of 5 from 214 ratings, while Ruler averages 5.0 from 5 ratings.
Do Authenticator App or Ruler have ads?
Neither Authenticator App nor Ruler shows ads.
Which is updated more often, Authenticator App or Ruler?
Authenticator App ships an update every 8 months, and Ruler every 2 days. Most recently, Authenticator App was updated on November 4, 2026 and Ruler on October 30, 2026.

Other comparisons