4Pilots vs RLM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
4Pilots
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CREATE AND SHARE UNLIMITED ICAO FLIGHT PLANS Simplify and streamline your flight planning process! In just three simple steps, you can create, share, and send ICAO PDF flight plans: • Fill out the required forms. • Generate the PDF. • Share or email your flight plan. MANAGE ALL YOUR AIRCRAFT IN ONE PLACE Save time by storing all the aircraft you fly in a convenient, organized list. • Add a new aircraft by tapping the “+” icon in the Aircrafts tab. • Required fields are marked for quick, error-free input. • Edit aircraft details, use saved aircraft as templates, or remove entries with simple gestures. TRACK YOUR FLIGHT PLAN HISTORY Keep a historical record of all your flight plans for easy reference and reuse. • Add a new flight plan in the Flight Plans tab by selecting an aircraft and filling in the required details. • Use info icons to clarify field requirements. • Edit, reuse as templates, or delete plans with intuitive swipe gestures. REVIEW AND SEND PDFS WITH EASE After completing your flight plan, click “Finish” in the final section of the form. The app instantly generates an ICAO-compliant flight plan PDF that you can review and send directly to the adequate ATS via email. CUSTOMIZE YOUR EXPERIENCE Head to the Settings tab to personalize your app experience: • Set default pilot information for faster form completion. • Choose between light and dark themes. • Access guides, contact support, and visit our website. Don’t forget to review the Privacy Policy and Terms & Conditions before getting started. PRO FEATURES: EXPAND YOUR CAPABILITIES Unlock advanced tools with the Pro version, designed to enhance your flight planning experience: Unit Conversions Quickly and accurately convert essential aviation units: • Celsius ↔ Fahrenheit • Nautical miles ↔ Statute miles • Nautical miles ↔ Kilometers • Feet ↔ Meters • Pounds ↔ Kilograms • Gallons ↔ Liters • Avgas Gallons ↔ Pounds • Jet A Gallons ↔ Pounds • Millibars ↔ Inches of mercury E6B Flight Computer Perform a comprehensive range of critical flight calculations: • Crosswind, headwind, and tailwind components • Hydroplane speed • Planned true airspeed • Heading and groundspeed • Compass heading • Leg time and fuel required • Required true airspeed • Endurance calculations • Percent MAC (Mean Aerodynamic Chord) • Required rate of climb • Specific range • Actual true airspeed • Groundspeed • Fuel consumption per hour • Distance flown • Top of descent • Required rate of descent • Glide distance Weight and Balance Calculations Ensure safety and compliance with accurate weight and balance tools: • Input your aircraft’s specific weight and balance data. • Calculate center of gravity (CG) positions for various configurations. • Verify compliance with aircraft limitations for optimal performance. Upgrade to Pro to access these powerful features and take your flight planning to new heights! Our Terms of Service can be found here https://4pilots.app/terms-conditions
RLM
This aviation computer app offers a comprehensive suite of tools for pilots. It calculates various flight parameters, including altitude, airspeed, ground speed, wind components, and weight & balance. The app also features unit and currency conversions, making it a versatile utility for aviation professionals.
- Altitude & Cloud Base Calculations
- Airspeed & Ground Speed Calculations
- Wind Component & Correction Tools
- Weight & Balance Calculations
- Unit & Currency Conversion
- Holding Pattern & Flight Plan Tools
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The RLM-Flight app is the ultimate aviation computer. Designed with a clear beautiful interface and easy to use through direct menu selection with all variables at sight converting it in the most powerful, versatile and useful aviation computer you may have in your iOS device. The RLM-Flight has a extensive Menu System: >Altitude & Cloud Base Worksheets: Calculate Pressure Altitude, Density Altitude, Barometric Pressure or Outside Temperature with or without humidity. Also calculates the Cloud Base above ground and Clouds Temperature knowing the Outside Temperature and Dew Point. >Standard Atmosphere: Calculate the Altitude, Temperature or Pressure and the Air Density and Speed of Sound in the International Standard Atmosphere (ISA). > Airspeed Calculations: Calculate the True Air Speed, Calibrated Air Speed, Outside Temperature, Mach number, Total Air Temperature or Pressure Altitude. >Ground Speed & Fuel Rate: Calculate the Ground Speed, Distance, Duration or Fuel consumption. >Glide & Climb/Descent: Calculate Horizontal Distance, Glide Ratio, Descent or Climb Altitude, Angle and Ratio. >Wind Components: Calculate Cross Wind, Head Wind, Run Way, Wind Speed or Wind Direction. >Wind Correction: Calculates the Ground Speed, True Course, True Air Speed, True Heading, Wind Speed or Wind Direction and the Wind Correction Angle. >Compass Heading: Calculate True Heading, Magnetic Heading, Compass Heading, Variation or Deviation. >Holding Pattern & From-To: Calculate the type of entry necessary and the inbound heading to enter in a holding pattern given by the airplane Heading, the Holding Radial and the standard turn (left or right). Also, convert the course from a location into the course to the same location. >Rhumb Line: Calculate the True Course, Rhumb Line Distance and the Great Circle Distance for flight paths specified by latitude and longitude. >Flight Plan: Calculate the Total Distance, Estimated Time in Route, Estimated Time of Arrival and Fuel Burned in a cross country flight composed of an arbitrary number of legs. >Weight & Balance: Calculates the total weight and the resulting center of gravity of an airplane base on the loads arms, weights and/or moments of different items including the empty aircraft weight and center of gravity, pilots, passengers, fuel and cargo areas. >Weight Shift & %MAC: Calculate the change in Center of Gravity, change in Weight, change in Arm or total Weight given the others. Also calculate the %MAC, Center of Gravity, Mean Aerodynamic Chord or Leading Edge of MAC given the others. >Units Conversion: powerful and completely customizable physical units conversion calculations. >Currency Conversion: to calculate currency exchanges between two selected world currencies and common crypto currencies with manual or on-line rates. > Math Functions: to apply scientific functions to the displayed number including angles conversion, trigonometric functions, logarithmic function, decimal hour to hour:minute:seconds, etc. System requirements: iOS 15.0 or above. 30 days Free-Trial. In-App-Purchase: One-Payment for life. License Agreement: http://www.apple.com/legal/itunes/appstore/dev/stdeula DISCLAIMER: THE “RLM-Flight” SOFTWARE IS PROVIDED TO YOU ON AN "AS IS" BASIS. THE SOFTWARE IS NOT CERTIFIED BY ANY AUTHORITY AT THE MOMENT AND THE USER ASUMES ALL THE RESPONSIBILITY OF IT USE. THE LICENSOR DOES NOT REPRESENT OR WARRANT THAT THE SOFTWARE CALCULATIONS OR DATA MADE WILL BE FREE FROM MISTAKES OR ANY OTHER DEFECTS OR ERRORS AND THAT ANY SUCH EFFECTS OR ERRORS WILL BE CORRECTED, OR THAT IT WILL OPERATE WITHOUT INTERRUPTION. YOU AGREE THAT YOU ARE SOLELY RESPONSIBLE FOR ALL COSTS AND EXPENSES ASSOCIATED WITH RECTIFICATION, REPAIR OR DAMAGE CAUSED BY SUCH DEFECTS, ERRORS OR INTERRUPTIONS.
Screenshots
Verdict
The clearest difference is ads: RLM at none against 4Pilots's shown. RLM also leads on update cadence (every 3 weeks vs every 19 months). On price, in-app purchases, 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
Both are free to download. 4Pilots sells 3 in-app purchases, starting at $1.99 per month and RLM sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
4Pilots ships an update every 19 months, RLM every 3 weeks. The most recent releases landed on September 11, 2026 and September 10, 2026 respectively.
| Parameter | 4Pilots | RLM |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 19 months | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 47 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Milos Cubrilo | R.L.M. Software |
In-app purchases
4Pilots
- Monthly Subscription$1.991 Month
- Yearly Subscription$17.991 Year
- 4Pilots Pro$24.99
RLM
- Lifetime Full Access$9.99









