Weather Calc vs Lunar Eclipse
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Weather Calc
This app provides pilots and weather enthusiasts with a comprehensive tool for performing various weather-related calculations. It offers conversions and computations for atmospheric pressure, temperature, humidity, wind speed, and more.
- Altimeter setting calculation
- Heat index computation
- Pressure unit conversion
- Relative humidity calculation
- Speed of sound display
- Wind chill computation
- Wind speed conversion
Read full descriptionHide full description
If you’re a pilot, you often need to make lots of weather related calculations. Now there’s an easy solution, as close as your iPhone. Weather Calc performs the following weather relation calculations: Altimeter Setting - compute the altimeter setting based on elevation and station pressure Cricket Temperature - just for fun! This lets you estimate the temperature based on the chirp rate of a cricket Heat Index - compute the heat index based on the temperature and relative humidity Pressure - convert between hPa, atmospheres, psi, and inches and mm of mercury (Hg) Relative Humidity - compute the wet bulb and dewpoint based on the temperature, pressure, and relative humidity Speed Of Sound - displays the speed of sound in various units, given the temperature Standard Atmosphere - compute the temperature, pressure, density, viscosity, speed of sound, and more Station Pressure - compute the station pressure based on the elevation and altimeter setting. Temperature - convert between degrees Fahrenheit, Celsius, Kelvin, and Rankine Virtual Temperature - compute the virtual temperature based on the temperature, dewpoint, and pressure Vapor Pressure - com[ute the saturated and actual vapor pressure, as well as relative humidity Wet Bulb - compute the dewpoint and relative humidity based on the temperature, pressure, and wet bulb reading Wind Chill - compute the wind chill based on the temperature and wind speed Wind Speed - convert between knots, kilometers/hour, meters/second, miles/hour, feet/second Buy your copy now, and let Weather Calc take the drugery out of weather related calculations.
Lunar Eclipse
Track upcoming lunar eclipses with this app. Choose to view total, partial, or both types of events. Easily add eclipse dates to your calendar and share them with others.
- Countdown to lunar eclipses
- Filter by total or partial eclipses
- Add events to calendar
- Share event dates
- iPad multitasking support
Read full descriptionHide full description
Countdown to the next total and partial eclipses of the moon. Features: - show only total eclipses, only partial eclipses or both events - add eclipse events to your calendar - share event dates via e-mail, Twitter or Facebook - displays the last eclipse for 6 hours after - support for iPad Pro and the iPad multitasking
Screenshots
Verdict
The clearest difference is review sentiment: Weather Calc at 86% against Lunar Eclipse's 0%. Weather Calc also leads on rating (4.5 vs 2.5). Lunar Eclipse's advantage is update cadence (every 6 months vs every 32 months) and iOS requirement (9.0 vs 15.6). On price, ratings volume, ads and in-app purchases 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
Weather Calc costs $0.99 and Lunar Eclipse $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Weather Calc holds the better App Store score, 4.5 against 2.5. Both are backed by a comparable volume of ratings — 4 and 4 respectively. Written reviews point the same way: 86% of Weather Calc's written reviews are positive against 0% of Lunar Eclipse's.
Weather Calc ships an update every 32 months, Lunar Eclipse every 6 months. The most recent releases landed on September 14, 2026 and September 21, 2026 respectively.
| Parameter | Weather Calc | Lunar Eclipse |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 4.5 (4 ratings) — better | 2.5 (4 ratings) |
| Positive reviews | 85.7% of reviews — better | 0.0% of reviews |
| Number of ratings | 4 | 4 |
| Update frequency | Every 32 months | Every 6 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | #173 — better | #181 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 9.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Black Cat Systems | Piet Jonas |
Customer experience
Weather Calc
Lunar Eclipse
In-app purchases
Weather Calc
No in-app purchases
Lunar Eclipse
No in-app purchases
Questions
Is Weather Calc free?
Is Lunar Eclipse free?
Which has better reviews, Weather Calc or Lunar Eclipse?
Do Weather Calc or Lunar Eclipse have ads?
Which is updated more often, Weather Calc or Lunar Eclipse?
Which is more popular, Weather Calc or Lunar Eclipse?
Other comparisons















