Humidity Calc vs Sticky or Dry
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Humidity Calc
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【Calculate Theoretical Relative Humidity】 A humidity calculation app for managing indoor humidity and checking humidifier performance. Calculate the theoretical indoor relative humidity from the outdoor temperature, outdoor relative humidity, and your indoor temperature. By comparing the calculated value with your hygrometer reading, you can estimate humidification performance and determine when a humidifier filter may need replacement. This app does not measure humidity. 【Key Features】 • Calculate theoretical indoor relative humidity • Compare calculated and measured humidity • Check humidifier performance • Estimate humidifier filter deterioration and replacement timing • Support daily indoor humidity management 【Recommended For】 • Users of evaporative humidifiers • Anyone who wants to check humidifier performance • Anyone who wants to know when to replace a humidifier filter • People managing indoor humidity during dry seasons • Anyone who wants to compare theoretical and measured humidity 【What Is Theoretical Relative Humidity?】 This app calculates the theoretical indoor relative humidity by converting outdoor relative humidity based on the amount of water vapor and applying the indoor temperature. Comparing the theoretical value with your hygrometer reading helps you evaluate humidifier performance and estimate whether the filter has lost efficiency. Ideal for users who want a simple way to monitor indoor humidity and maintain humidifier performance.
Sticky or Dry
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Your thermostat only tells part of the story. Sticky or Dry brings temperature and relative humidity together, helping you understand how the air in and around your home actually feels. Compare indoor and outdoor conditions, see how they change over time, and get practical guidance for making your place feel better. KNOW WHAT TO DO NEXT The Indoor Climate Guide compares your chosen indoor and outdoor data points and considers the climate-control equipment available in your home. It can help you decide when to open or close the windows, use an air conditioner or heater, adjust window shades, or simply turn on a fan. When enabled, it can also look at the next six hours of weather to prepare for changing conditions. COMFORT IS MORE THAN TEMPERATURE Two rooms at the same temperature can feel completely different. The reason is moisture. Relative humidity describes how much moisture the air holds compared with the maximum it could hold at that temperature. Dew point brings temperature and relative humidity together into a clearer measure of how much moisture is actually in the air. A lower dew point tends to feel dry. A higher dew point can feel sticky or muggy. Sticky or Dry visualizes this relationship using colored comfort bands, helping you see at a glance where each room or location sits. BRING YOUR CONDITIONS TOGETHER Add different kinds of data points to the same interactive chart: • Weather locations with current outdoor conditions and forecast • Compatible temperature and humidity sensors from the Apple Home app • Manual data points you can drag around the chart yourself Manual data points make the app useful even without a home sensor. Use them to enter a reading from another thermometer or hygrometer, or explore how different combinations of temperature and humidity might feel. Compatible Apple Home accessories include sensors such as the SONOFF AirGuard, Aqara Climate Sensor W100, Eve Weather, IKEA ALPSTUGA, and IKEA TIMMERFLOTTE. Compatibility depends on the accessory exposing its temperature or humidity readings through the Apple Home app. SEE HOW CONDITIONS CHANGE Historic trails show how each data point has moved across the chart over time. Follow up to 24 hours of captured readings to see whether a room is becoming warmer, cooler, drier, or more humid. MAKE IT YOUR OWN • Give every data point its own label and color • Choose Celsius or Fahrenheit • Set your desired indoor temperature range • Select the equipment available in your home • Compare any indoor and outdoor data points • Inspect temperature, relative humidity, and calculated dew point at a glance Sticky or Dry is designed for iPhone, iPad, and Mac. Its comfort calculations and guidance are performed on-device. Understand your indoor climate and make your place feel better. Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Humidity Calc at none against Sticky or Dry's 1. Humidity Calc also leads on iOS requirement (17.6 vs 26.0). Sticky or Dry's advantage is ads (none vs shown). On price, update cadence and device support 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. Sticky or Dry sells 1 in-app purchase, starting at $2.99 per year. Humidity Calc asks for nothing beyond the download.
Humidity Calc ships an update every 3 weeks, Sticky or Dry every 10 days. Both last shipped on October 31, 2026.
| Parameter | Humidity Calc | Sticky or Dry |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 10 days — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad | iPhone, iPad, Mac — better |
| Requires iOS | 17.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 38 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Hiroaki Oosawa | Arcana Media |
In-app purchases
Humidity Calc
No in-app purchases
Sticky or Dry
- Sticky or Dry Pro Yearly$2.991 Year
Questions
Is Humidity Calc free?
Is Sticky or Dry free?
Do Humidity Calc or Sticky or Dry have ads?
Which is updated more often, Humidity Calc or Sticky or Dry?
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