Comparison

THERMO vs GDDTracker

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

THERMO

Monitor your home's condition remotely with wireless sensors and a gateway. Receive instant push notifications for malfunctions like open doors, power outages, or temperature issues, preventing potential damage. Easy setup allows for quick monitoring of your property from anywhere.

Highlights
  • Remote home condition monitoring
  • Wireless sensor integration
  • Instant push notifications
  • Easy 5-step installation
  • Customizable alarm limits
  • Expandable sensor system
  • IoT platform integration
Features
Read full description

The plus in safety You want to know what your flat or house is doing right now - with the MOBILE ALERTS home monitoring system you can easily find out about its condition: - Are all windows and doors closed? - Is the freezer cold enough? - Can I leave the washing machine running unattended? - Has the power failed? All these questions will be answered in the future by the MOBILE ALERTS home monitoring system in this practical app in combination with various wireless sensors for your home. All you need to operate this app is the necessary hardware, consisting of the gateway and at least one sensor of your choice (e.g. MOBILE ALERTS Starterkit MA 10001 Set) and an internet connection. Via the Internet connection and the gateway, the MOBILE ALERTS app enables you to call up all the information from your home on your smartphone anywhere in the world. The sensors permanently monitor the current data and report malfunctions automatically and immediately via push notification to your smartphone, whereby greater damage can be avoided by targeted action. The simple installation enables every user to monitor the house at any time in just 5 steps: Once you have downloaded the permanently free MOBILE ALERTS app from the Appstore, it is immediately ready for use after installation thanks to Plug&Play. A personal registration is not necessary. Now connect the gateway to the power supply unit and your router. Then insert batteries in the selected wireless sensors. Open the app, scan in the codes of the wireless sensors and you can access all the recorded data with your smartphone and check the current status of your home - anytime, anywhere. The whole process is completed within 2 minutes at the latest. The app's self-explanatory, graphical user interface is intuitive to use and can be individually adapted to your needs. Define an individual name for each wireless sensor and set up specific alarm limits yourself. If these alarm limits are exceeded, the wireless sensors immediately report the fault to your smartphone and thus offer you the PLUS in security. The MOBILE ALERTS system can be expanded with many other wireless sensors as required. In addition to temperature monitoring, these provide additional data on air humidity, water temperature, leaking water, information on open and closed windows or doors and much more. The MOBILE ALERTS system can be used with many other IoT systems via the Conrad Connect IoT platform. In addition, there is support for the common language assistants. We are continuously working on the range of our sensors. Further information, an overview of all available sensors and an additional video for installation can be found in your app under INFO or at www.mobile-alerts.eu.

About

GDDTracker

This app calculates Growing Degree Days (GDD) using hyper-local weather data to help you precisely time lawn care applications. It also logs applications, provides smart reminders, and includes profiles for over 50 grass varieties.

Highlights
  • Growing Degree Day (GDD) calculation and forecasting
  • Application logging with product details and notes
  • Smart reminders based on GDD, days, or soil temp
  • 50+ grass variety profiles
  • Rate calculator for product amounts
  • Multiple lawn management
  • CSV/PDF record export
Features
Read full description

GDD Tracker is the complete lawn care companion for homeowners and pros who want precision timing and organized records. Using your location and hyper-local weather data, the app calculates Growing Degree Days (GDD) so you know exactly when to apply pre-emergents, post-emergents, plant growth regulators, fertilizers, and more. But GDD Tracker goes beyond just tracking — it's a full-featured lawn management tool. GDD Tracking & Forecasting • Accurate GDD calculations based on your location and daily temps • Forecasted date to hit your target threshold • Clear progress with percentage, badge, and cumulative/daily charts • No-spray advisories for high wind, heat, or rain Application Log • Log every application — PGR, fertilizer, weed control, fungicide, insecticide, and more • Track products, rates, and notes for each entry • View season history with year-over-year comparisons • Export your records as CSV or PDF Smart Reminders • Get notified when it's time to reapply • Set reminders by GDD accumulation, calendar days, or soil temperature • Early warning alerts as you approach your threshold Built for Your Lawn • 50+ grass variety profiles — Bermuda, Zoysia, Fescue, Bluegrass, and more • Rate calculator for exact product amounts based on lawn size • Soil temperature estimates for pre-emergent and seeding timing • Manage multiple lawns with separate locations, settings, and color tags Everywhere You Need It • Widgets for your Home Screen • Apple Watch app for a quick glance • iCloud sync across all your devices • Optional device location or locked "home" coordinates Privacy-First No ads. No data selling. Location is used only to fetch local weather. iCloud sync is optional. How it works: 1. Add your lawn and choose your grass type or set a custom threshold. 2. Set your start date (e.g., last application). 3. Track daily progress as GDD accumulates. 4. Log applications and get notified when it's time to reapply. Perfect for: • Homeowners aiming for a healthier, weed-free lawn • DIY lawn enthusiasts who want precision timing • Lawn care pros who manage multiple properties and schedules Subscription Information GDD Tracker Pro is required to access all features. Two auto-renewing subscription options are available: • Monthly: $0.99/month • Annual: $9.99/year The annual plan includes a 7-day free trial. Payment will be charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your App Store account settings after purchase. Privacy Policy: https://gdd-tracker.com/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Download GDD Tracker and take the guesswork out of lawn care.

Screenshots

THERMO4 screens
GDDTracker4 screens

Verdict

The call

The clearest difference is in-app purchases: THERMO at none against GDDTracker's 2. GDDTracker's advantage is update cadence (every 2 days vs every 7 months). On price, review sentiment, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. GDDTracker sells 2 in-app purchases, starting at $0.99 per month. THERMO asks for nothing beyond the download.

UpkeepUpdate frequency

THERMO ships an update every 7 months, GDDTracker every 2 days. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
THERMO versus GDDTracker: the parameters behind the verdict, then further details
ParameterTHERMOGDDTracker
PriceFreeFree
Rating—4.7 (13 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings—13 — better
Update frequencyEvery 7 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPadiPhone, Apple Watch
Requires iOS17.0 — better17.6
Further details — not scored
Size11 MB15 MB
Age rating4+4+
DeveloperDATA INFORMATION SERVICES GmbHKirk Faris

Customer experience

THERMO

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

GDDTracker

All ratings13 ratings
Positive92.3%
Neutral0.0%
Negative7.7%
Written reviews7 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

THERMO

No in-app purchases

2 purchases

GDDTracker

Subscriptions2
  • Monthly$0.991 Month
  • Annual7 Days trial$9.991 Year

Questions

Is THERMO free?
THERMO is free to download, with no in-app purchases.
Is GDDTracker free?
GDDTracker is free to download, with in-app purchases available.
Do THERMO or GDDTracker have ads?
Neither THERMO nor GDDTracker shows ads.
Which is updated more often, THERMO or GDDTracker?
THERMO ships an update every 7 months, and GDDTracker every 2 days. Most recently, THERMO was updated on November 6, 2026 and GDDTracker on October 30, 2026.

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