# Thermo Diem: Feels Like Temp — Is it warmer than yesterday? > Compares current 'feels like' temperature to the previous day. (iPhone/iPad app by Basic Function.) - Source: https://appshunter.io/ios/app/thermo-diem-feels-like-temp/id912968904 (this page in markdown: same URL + `.md`) - Developer: [Basic Function](https://appshunter.io/developer/434863190) - Category: Weather, Utilities - Price: Free - Rating: 3.75/5 from 4 App Store ratings · 20 written reviews indexed - Age rating: 4+ - Requires: iOS 26.0 · 5 MB - Languages: German (Germany), European Spanish, American English, French (France) - Released: 2014-10-14 - Data updated: 2026-10-24 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/thermo-diem-feels-like-temp/id912968904/reviews.md ## What is Thermo Diem? Most weather apps give you numbers. Thermo Diem gives you context. A 72° day after freezing weather can feel completely different from 72° after a heat wave. Thermo Diem compares apparent temperature across time, giving you an immediate answer: How does today feel compared with yesterday? You can also look ahead to tomorrow and explore how upcoming days may feel relative to right now or yesterday’s high. RELATIVE WEATHER AT A GLANCE Thermo Diem translates complex weather data into seven clear shifts: • Much Warmer • Warmer • A Little Warmer • About the Same • A Little Cooler • Cooler • Much Cooler Color-synchronized spectrum gauges make every change easy to understand at a glance. APPARENT TEMPERATURE, EXPLAINED Air temperature is only part of how weather feels. Thermo Diem combines established biometeorological models—including NOAA Wind Chill, the Rothfusz Heat Index, and Steadman-based apparent-temperature calculations—to account for conditions such as: • Humidity and vapor pressure • Wind and convective heat loss • Sunlight and solar exposure • The combined thermal effect on the human body The result is a more useful feels-like temperature, placed in the context of recent and upcoming conditions. TREND CURVES & FUTURE SHIFT See today’s feels-like trajectory alongside yesterday’s curve. Explore the seven-day forecast, select upcoming hours, and compare future conditions with right now, the same time yesterday, or yesterday’s high. BUILT FOR IPHONE DUO Open iPhone Duo to reveal a spacious paired comparison of reference and target conditions. Adaptive layouts support expanded, folded, and tabletop use while preserving your selected day, hour, and comparison. CARPLAY, DYNAMIC ISLAND & LIVE ACTIVITIES Bring relative-weather intelligence into your commute. Thermo Diem displays glanceable temperature shifts, feels-like conditions, and synchronized spectrum gauges across CarPlay, the Lock Screen, and Dynamic Island. HOME & LOCK SCREEN WIDGETS Bring Thermo Diem’s bold poster typography to your Home Screen and Lock Screen. Choose from headline, overview, gauge, commute, and driving-focused layouts. Widgets update throughout the day and can be customized with comparison targets and display options. APPLE WATCH Use the standalone Apple Watch app for fast, independent weather checks. A growing collection of complications supports Corner, Circular, Rectangular, and Inline layouts, with designs optimized for glanceability across different watch faces. NATIONWIDE MOVERS Discover where the country’s biggest temperature shifts are happening. Nationwide Movers highlights major 24-hour changes across diverse climate regions. AVAILABLE IN 4 LANGUAGES Thermo Diem supports English, Spanish, French, and German throughout the app, widgets, and Apple Watch experience. PRIVACY FIRST No advertising networks, behavioral tracking, or data harvesting. Just clear, focused weather intelligence. ## Key features - Compares today's 'feels like' temperature to yesterday - Provides 7 relative temperature descriptions - Considers humidity, wind, dew points, and temperature - Designed for Apple Watch - Uses Forecast.io data ## Is Thermo Diem safe? Not enough ratings yet to assess Thermo Diem. ## Is Thermo Diem legit? Thermo Diem: Feels Like Temp appears to be a legitimate app. The AppsHunter Legitimacy Score for Thermo Diem is 83 out of 100 points across 7 verification signals from App Store and developer data. ## Recent user reviews (10 of 20) All indexed reviews: https://appshunter.io/ios/app/thermo-diem-feels-like-temp/id912968904/reviews.md ### 3/5 — Good concept, but often wrong *2026-10-14* I like the idea of this app a lot but to give an example of how completely wrong this app can be, right now the feels like temp is 70°F and when I compare with tomorrow it says it will feel much cooler tomorrow. The feels like temp at this time tomorrow it says? 70°F. Hmm. If the dev can fix this app it would be great, but it’s been around a long time and yet it’s so entirely wrong still? That doesn’t give me a lot of hope. **Developer response:** Thanks for pointing this out, you were right. We found an issue where the tomorrow comparison could show today’s temperature alongside tomorrow’s warmer/cooler verdict, making the result appear contradictory. We’ve fixed it and added testing to prevent it from happening again. We appreciate the clear example and hope you’ll give the update another try. The fix will be up in version 3.7 coming out very soon. Please send any and all bug reports to thermodiem@gmail.com or leave a message on X and we'll address them ASAP! Thanks - Mickey (Lead Dev) ### 2/5 — Widget not current *2026-10-08* After I click on widget, only then it updates to the current weather. This defeats the purpose of being able to glance at the widget and have current information. **Developer response:** Thanks for reporting this. I tracked down the stale widget behavior and made some changes since this review was posted. The widget now updates its displayed weather every hour and fetches fresh weather data in the background more often, without needing the app to be opened first. iOS still controls the exact timing of background updates, but this should be much more reliable now. Look for version 3.6.1 coming any day now. Thanks - Mickey (Lead Dev) ### 5/5 — Julia *2026-09-30* I love this app I really recommend it for people who are on the go because it is easy to see it right away and compare today and the next days temps guys get it!!!!!😭🙏 ### 5/5 — 3.2 is a Game Changer *2026-09-24* Works on all of your devices ### 2/5 — apparently 90 is cooler than 78 *2019-07-20* For a while this app would always say “today is warmer” I kind of forgot about it until a couple days ago. The high was 78. The next day was in the mid 90s, yet the app kept saying “today is cooler” ### 1/5 — Always warmer *2019-05-17* All this app ever tells me is that today will feel warmer than yesterday. Every day. ### 2/5 — Eh. *2017-09-22* This is a very good idea, however it’s not always accurate. ### 2/5 — Widget broken *2017-04-06* Great idea for an app. But the widget isn't updating and that's kinda the whole point. ### 1/5 — Not accurate *2017-03-11* TODAY IS ALWAYS SIMILAR TO YESTERDAY. I have yet to see a difference. I live in Maryland with drastically different temperatures such as two days ago being 67 and the following day in the 30s. And "today will feel similar to yesterday". Never a change, ever. A lot of times yes today is the same forecast but often times it is 20-30 degrees warmer or colder and no change. Hate this app. It's useless. ### 2/5 — Poor today widget and Watch extension *2016-02-28* The today's notification widget and the actual app info is never aligned. Meaning the today widget will say "tomorrow will feel like today" and when you open the actual app it will say "tomorrow's will feel much cooler". This happens almost every time. Same issue with Watch extension. Simple app like this should be in sync. ## Frequently asked questions about Thermo Diem ### What does Thermo Diem compare? Thermo Diem compares today's 'feels like' temperature to how it felt 24 hours ago. It takes into account factors like relative humidity, wind, dew points, and temperature to provide a relative sense of warmth or coolness. ### How does Thermo Diem describe the temperature changes? Thermo Diem provides seven simple outputs: Much Warmer, Warmer, Slightly Warmer, Similar, Slightly Cooler, Cooler, and Much Cooler. This offers a quick, relative understanding of the day's weather feel. ### What data source does Thermo Diem use? Thermo Diem utilizes data provided by Forecast.io, which is described as a highly accurate weather reporting service. ### Is Thermo Diem available on other devices besides Apple Watch? The description specifically highlights that Thermo Diem is designed for the Apple Watch, suggesting it is optimized for or primarily available on that platform. ### What is the formula used by Thermo Diem? Thermo Diem uses the formula AT = -2.7 + 1.04*T + 2.0*e -0.65*v, where AT and T are in degrees Celsius, e is vapor pressure in kPa, and v is 10m wind speed in m/sec. ### How often is Thermo Diem updated? The latest version, 2.1, was released on June 4, 2015. This indicates that updates may not be very frequent, with the last update being several years ago. ### What is the user rating for Thermo Diem? Thermo Diem has a rating of 1.5 stars based on 6 ratings. This suggests a generally negative user sentiment based on the limited feedback available. ### Does Thermo Diem have ads? The provided data does not specify whether Thermo Diem contains advertisements. However, it is a free application, which sometimes correlates with ad support. ## Version history (last 5 releases) ### 3.8 — 2026-10-20 What’s New • Native support for iPhone Duo, with adaptive layouts for expanded, folded, and tabletop use • Refresh button added to widgets • Faster, more reliable widget updates throughout the day and overnight. • New Apple Watch complications and refreshed watch-face designs • Improved CarPlay widgets and Live Activity presentation • More consistent weather comparisons across iPhone, Apple Watch, widgets, and CarPlay • Clearer handling when historical comparison data is unavailable • Refined typography, layouts, localization, and accessibility • Performance improvements and general optimizations • Bug fixes and reliability improvements ### 3.7 — 2026-10-18 What’s New in 3.6 • Native support for iPhone Duo, with adaptive layouts for expanded, folded, and tabletop use • Faster, more reliable widget updates throughout the day and overnight • New Apple Watch complications and refreshed watch-face designs • Improved CarPlay widgets and Live Activity presentation • More consistent weather comparisons across iPhone, Apple Watch, widgets, and CarPlay • Clearer handling when historical comparison data is unavailable • Refined typography, layouts, localization, and accessibility • Performance improvements and general optimizations • Bug fixes and reliability improvements ### 3.5 — 2026-10-05 What's New in Version 3.5: • Home Screen Quick Actions: Long-press (Haptic Touch) the app icon to jump to Tomorrow's Forecast, Nationwide Movers, or activate your Commute Live Activity. • Reliable Widget Scheduling: Improved background refresh cadence for Lock Screen and Home Screen widgets. • Tomorrow Outlook Polish: Smoother transitions and refined typography when previewing tomorrow's temperature shift. • Performance & Stability: Memory optimizations and background task reliability enhancements. • MacOS version • What's New in Version 3.4: • Commute Live Activity & Dynamic Island drive tracking. • Smart automatic background refresh scheduled before morning waking hours. • Deeper solar radiation and wind gust biometeorology modeling. • What's New in Version 3.3: • Multilingual support (Spanish, French, German). • Editorial headline grammar refinements ("About the same as yesterday"). • Streamlined city and US state abbreviation labels. • What's New in Version 3.2: • Nationwide Movers: Real-time leaderboard tracking the largest 24-hour temperature swings across the country. • Quick City Switcher to view any mover's climate delta. • Enhanced Apple Watch Ultra and Series contrast. • What's New in Version 3.1: • Interactive 24-hour horizon scrubber to compare future hours with yesterday. • Peak comparison toggle: "Same Time" vs. "Yesterday's High". • Dynamic high-contrast palettes for extreme shifts. • What's New in Version 3.0: • Complete ground-up redesign with bold Anton typography. • NOAA-grade biometeorological apparent temperature engine. • Native standalone Apple Watch app with gauge needles. • Modern Lock Screen and Home Screen widgets. ### 3.4 — 2026-09-29 What's New in Version 3.4 • Bigger, Bolder Lock Screen Widget: Completely re-engineered circular lock screen widget with an edge-to-edge layout that dramatically expands font sizes for instant, glanceable legibility. • Synchronized Spectrum Slider: Fine-tuned the color spectrum bar across Live Activities, widgets, and the main app so the needle position precisely mirrors your feels-like tier and headline accent color. • Lock Screen & CarPlay Polish: Enhanced contrast, refined delta badges, and smoother real-time commuter updates Also recently added in 3.0: • Multilingual Localization (3.3): Full native support for Spanish, French, and German with tailored editorial grammar. • CarPlay Commute Integration (3.2): Live temperature comparison banner directly on your vehicle dashboard. • Nationwide Movers (3.1): Live tracker uncovering which cities experienced the biggest 24-hour temperature swings. • Complete 3.0 Redesign: Advanced NOAA biometeorological modeling (Wind Chill, Heat Index, and Solar Radiation), 24-hour interactive comparison horizon, Dynamic Island Live Activities, and a companion Apple Watch app with wrist complications. ### 3.3 — 2026-09-26 What's new in 3.3: • Multi-Language Support: Thermo Diem is now fully localized in Spanish, French, and German! • Editorial Headline Grammar: Streamlined comparison phrasing with natural equative logic ("About the same as yesterday"). • Precision Weather Integrity: Enhanced data consistency across Home Screen widgets, Apple Watch complications, and CarPlay Live Activities. • Performance & Dynamic Type: Faster optical caching for instant font rendering. ## Apps similar to Thermo Diem | App | Rating | Price | Category | | --- | --- | --- | --- | | [Air Quality - SLOX](https://appshunter.io/ios/app/air-quality-slox/id6777736957) | — | Free | Weather | | [HeatSafe](https://appshunter.io/ios/app/heatsafe/id6794441377) | — | Free | Weather | | [Wind now](https://appshunter.io/ios/app/wind-now/id6744869660) | — | $1.99 | Weather | | [Weather.Co - GA Flight tools](https://appshunter.io/ios/app/weatherco-ga-flight-tools/id6763469047) | 5.0 (5) | Free | Weather | | [Weather - Eisen](https://appshunter.io/ios/app/weather-eisen/id6759874486) | — | Free | Weather | | [WeatherWise Ai](https://appshunter.io/ios/app/weatherwise-ai/id6776046095) | 5.0 (1) | Free | Weather | ## More apps by Basic Function - [Hungry Lizards](https://appshunter.io/ios/app/hungry-lizards/id525416212) All apps by Basic Function: https://appshunter.io/developer/434863190 ## Related topics [delorenzo](https://appshunter.io/ios/topics/delorenzo) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-24.*