RLM vs Sunny
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Sunny
This app helps film photographers achieve accurate exposures by providing real-time light metering. It offers multiple metering modes and customizable settings to match your camera and lenses, ensuring your shots are perfectly exposed.
- Four Exposure Modes (Av, Tv, A, M)
- Dual Metering Systems (Average, Spot)
- Gear Customization
- Focal Length Matching
- Save Settings (Exif Logger)
- Custom Metering Engine
- Real-Time Feedback
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Sunny provides accurate exposure readings to ensure your shadows are preserved and your highlights are rich, whether you're shooting 35mm film or medium format. Features - Aperture Priority, Shutter Priority, Program, and Manual. - Spot and average metering. - Exposure compensation, up to three stops either way. - Drag any dial to take control of that value and Sunny solves the rest. - Match your gear: aperture and shutter speed ranges, and focal lengths from 13mm to 200mm. - Save a reference photo with your settings written onto the frame, so you know what you shot when the scans come back. Why Sunny? - A metering engine built from the ground up and calibrated against professional equipment. - Light on battery, so you are never left stranded. - Built specifically for color negative and slide film. *Subscription or purchase required for certain modes and features. Privacy Policy: https://sunnymeter.app/privacy Terms of Service: https://sunnymeter.app/terms
Screenshots
Verdict
The clearest difference is monetization model: RLM at free against Sunny's free with in-app purchases. RLM also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.6). Sunny's advantage is update cadence (weekly vs every 3 weeks). On price, rating, ratings volume and ads 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. RLM sells 1 one-off in-app purchase and Sunny sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 5.0 for RLM against 5.0 for Sunny. Both are backed by a comparable volume of ratings — 2 and 2 respectively.
RLM ships an update every 3 weeks, Sunny weekly. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.
| Parameter | RLM | Sunny |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (2 ratings) |
| Number of ratings | 2 | 2 |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 6 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | R.L.M. Software | Trevor Welsh |
Customer experience
RLM
Sunny
In-app purchases
RLM
- Lifetime Full Access$9.99
Sunny
- Sunny Pro Monthly$3.991 Month
- Sunny Pro Annual$19.991 Year
- Sunny Pro Lifetime$29.99









