coolAltitude vs Simple Ruler inch/cm
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
coolAltitude
This professional tool assists IFR pilots in cold weather with temperature corrections for instrument approaches. It integrates weather, runway, and de-/anti-icing data into a clear workflow to reduce workload and enhance situational awareness during flight preparation.
- Temperature-corrected altitude calculations for various approaches
- Integrated weather and runway condition data
- De-/anti-icing support with holdover time timers
- SNOWTAM decoding and braking action information
- Save and share approach presets and operational data
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coolAltitude is a professional aviation tool and calculator for IFR pilots operating in cold-weather conditions. It assists with temperature corrections during instrument approaches and integrates weather, runway and de-/anti-icing data into a single, clear workflow. Designed to reduce workload and improve situational awareness during flight preparation, coolAltitude focuses on accuracy, clarity and operational usability. Some advanced features require a paid subscription. -------------------------------- What coolAltitude does • Calculates temperature-corrected altitudes for ILS (CAT I), RNAV/GNSS, VOR and NDB approaches • Requires minimal data entry, using consistent color coding for immediate interpretation • Displays corrected altitudes along the entire approach profile at relevant DME distances • Supports flight path angle (FPA) calculations for FPA-enabled aircraft • Provides vertical speed reference tables (corrected and uncorrected) for various ground speeds • Includes QNH to QFE conversion tables with temperature corrections -------------------------------- Integrated weather and runway information • Live METAR interaction with automatic propagation of relevant values, including temperature (requires subscription) • SNOWTAM decoding with braking action information • RCAM (Runway Condition Assessment Matrix) based on ICAO GRF • Support for DME shift, including threshold, touchdown zone and displaced DME references -------------------------------- De-/Anti-icing support (requires subscription) • FAA Holdover Time (HOT) Guidelines for multiple fluid types and manufacturers • Integrated HOT countdown timer to track minimum and maximum recommended holdover times • Reference tables supporting assessment of snowfall intensity • Structured storage and sharing of airport-specific de-/anti-icing procedures -------------------------------- Saved and shared data (requires subscription) • Save and reload approach presets for individual airports and procedures • Share verified, structured operational data with other users • Local override of shared data when required -------------------------------- Built for professional use coolAltitude is built by pilots, for pilots. It is designed to support decision-making during high-workload phases without replacing approved procedures. -------------------------------- Important notice coolAltitude is an advisory tool only. It is not certified for operational use and does not replace approved documentation. Use in flight operations requires approval and operation as part of the operator’s Electronic Flight Bag (EFB) in accordance with applicable regulations. -------------------------------- coolAltitude does not replace your procedures. It helps you apply them correctly, even on the coldest days. -------------------------------- Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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.
- On-screen ruler
- Inch measurement
- Centimeter measurement
- Simple interface
- Accurate measurements
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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
Verdict
The clearest difference is in-app purchases: Simple Ruler inch/cm at none against coolAltitude's 2. Simple Ruler inch/cm also leads on price ($0.99 vs $7.99) and update cadence (daily vs every 5 months). 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
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.
coolAltitude ships an update every 5 months, Simple Ruler inch/cm daily. The most recent releases landed on October 13, 2026 and October 16, 2026 respectively.
| Parameter | coolAltitude | Simple Ruler inch/cm |
|---|---|---|
| Price | $7.99 | $0.99 — better |
| Rating | 5.0 (7 ratings) — better | — |
| Positive reviews | 75.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 7 — better | — |
| Update frequency | Every 5 months | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.0 | 16.1 — better |
| Further details — not scored | ||
| Size | 49 MB | 1 MB |
| Age rating | 17+ | 4+ |
| Developer | SilkIdea s.r.o. | Systemiko Inc. |
Customer experience
coolAltitude
Simple Ruler inch/cm
In-app purchases
coolAltitude
- De & Anti-Icing Pro$7.991 Year
- Save & Retrieve Approach Data$7.991 Year
Simple Ruler inch/cm
No in-app purchases
Questions
Is coolAltitude free?
Is Simple Ruler inch/cm free?
Do coolAltitude or Simple Ruler inch/cm have ads?
Which is updated more often, coolAltitude or Simple Ruler inch/cm?
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