Comparison

coolAltitude vs Simple Ruler inch/cm

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

Head to head
About

coolAltitude

This app provides pilots with essential tools for cold-temperature altitude corrections, approach profiles, and de-icing calculations. It integrates weather data and offers a clear interface for critical flight planning information.

Highlights
  • Cold-temperature altitude corrections
  • Approach profile visualization
  • De-icing and holdover time calculations
  • FMS-style approach setup
  • METAR, TAF, and runway condition integration
  • Light and dark mode support
Features
Read full description

coolAltitude brings cold-temperature altitude corrections, approach profiles and de-icing tools into one focused workspace for pilots. ALTITUDE CORRECTIONS Enter the temperature and approach data, compare entered and corrected altitudes, and see the result in a clear approach profile. Select the correction method and rounding option for your workflow. DME shift helps put distance references in context. APPROACH SETUP Use the FMS-style interface to work with airport, runway and approach data. A structured display and dedicated keys keep the setup readable alongside the profile. DE-ICING AND HOLDOVER TIME Select the applicable conditions, fluid type and concentration. Review the available holdover guidance and keep the countdown visible during your workflow. WEATHER AND RUNWAY CONTEXT Consult METAR, TAF and runway-condition information alongside your calculations. Online information depends on the availability of the connected services. READABLE IN LIGHT AND DARK Clear colour roles distinguish inputs, corrected values and shifted values. Light and Dark appearances support different lighting conditions, with restrained surfaces and readable controls. Some features require an in-app subscription. Check the in-app purchase screen for the features included, subscription terms and current pricing. Use current operational information and the procedures applicable to your aircraft and operation when assessing results. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Simple Ruler inch/cm

This utility transforms your iPhone into a precise on-screen ruler for measuring in inches and centimeters. It offers a simple interface for quick measurements, serving as a handy tool for various tasks.

Highlights
  • On-screen ruler
  • Inch measurement
  • Centimeter measurement
  • Simple interface
  • Accurate measurements
Read full description

Simple and useful must have application! This application turns your iPhone into an accurate on-screen inches and centimeters ruler. Application supports following devices. iPhone SE 2nd gen iPhone SE 3rd gen iPhone X iPhone XS iPhone XS Max iPhone 11 Pro iPhone 11 Pro Max iPhone 12 mini iPhone 12 iPhone 12 Pro iPhone 12 Pro Max iPhone 13 mini iPhone 13 iPhone 13 Pro iPhone 13 Pro Max iPhone 14 iPhone 14 Plus iPhone 14 Pro iPhone 14 Pro Max iPhone 15 iPhone 15 Plus iPhone 15 Pro iPhone 15 Pro Max *Important notice: Use the information recoded or functionality provided in / or generated with this application only as a rough indication, rough estimates or as a rough guide. Even though we do our best to provide you with confirmed information and tried-and-tested features, the accuracy and successful operation and performance of the application are NOT GUARANTEED by us. Users are strongly advised to confirm the information of their interest with other sources and not to ultimately rely on functionality and performance of this application. This application is provided “as is” and with all faults. You bear the risk of using it. We shall not be responsible or liable for any loss or damage of any kind incurred as a result of the use of functions or the content of this application. By using this application you are agreeing to these terms. If you do not agree to these terms do not use this application.

Screenshots

coolAltitude4 screens
Simple Ruler inch/cm1 screens

Verdict

The call

The clearest difference is review sentiment: Simple Ruler inch/cm at 100% against coolAltitude's 60%. Simple Ruler inch/cm also leads on in-app purchases (none vs 2) and price ($0.99 vs $7.99). On ads, device support 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

coolAltitude costs $7.99 and Simple Ruler inch/cm $0.99 up front. coolAltitude sells 2 in-app purchases, starting at $7.99 per year. Simple Ruler inch/cm asks for nothing beyond the download.

UpkeepUpdate frequency

coolAltitude ships an update every 3 months, Simple Ruler inch/cm daily. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.

Scorecard5 real differences · 5 level
coolAltitude versus Simple Ruler inch/cm: the parameters behind the verdict, then further details
ParametercoolAltitudeSimple Ruler inch/cm
Price$7.99$0.99 — better
Rating5.0 (7 ratings) — better—
Positive reviews60.0% of reviews100.0% of reviews — better
Number of ratings7 — better—
Update frequencyEvery 3 monthsDaily — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad — betteriPhone
Requires iOS17.016.1 — better
Further details — not scored
Size56 MB1 MB
Age rating17+4+
DeveloperSilkIdea s.r.o.Systemiko Inc.

Customer experience

coolAltitude

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive60.0%
Neutral0.0%
Negative40.0%

Simple Ruler inch/cm

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

coolAltitude

Subscriptions2
  • De & Anti-Icing Pro$7.991 Year
  • Save & Retrieve Approach Data$7.991 Year
None

Simple Ruler inch/cm

No in-app purchases

Questions

Is coolAltitude free?
coolAltitude costs $7.99, and also offers in-app purchases.
Is Simple Ruler inch/cm free?
Simple Ruler inch/cm costs $0.99, with no in-app purchases.
Do coolAltitude or Simple Ruler inch/cm have ads?
Neither coolAltitude nor Simple Ruler inch/cm shows ads.
Which is updated more often, coolAltitude or Simple Ruler inch/cm?
coolAltitude ships an update every 3 months, and Simple Ruler inch/cm daily. Most recently, coolAltitude was updated on November 7, 2026 and Simple Ruler inch/cm on November 4, 2026.

Other comparisons