USD 243 vs DecayMate
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
USD 243
Stay informed about district events, customize notifications for your student's organizations, and access weekly cafeteria menus. Get live updates from administration and easily find staff and department contact information.
- Event calendar with sharing
- Customizable student organization notifications
- Weekly cafeteria menus
- Live district updates feed
- Staff and department directory
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Introducing the brand new app for USD 243. NEVER MISS AN EVENT The event section shows a list of events throughout the district. Users can add an event to their calendar to share the event with friends and family with one tap. CUSTOMIZE NOTIFICATIONS Select your student's organization within the app and make sure you never miss a message. CAFETERIA MENUS Within the dining section, you'll find an easy to navigate, weekly menu, sorted by day and meal type. DISTRICT UPDATES In the Live Feed is where you'll find updates from the administration about what's going on in the district right now. Whether that's celebrating a student's success, or reminding you about an upcoming deadline. CONTACT STAFF & DEPARTMENTS Find relevant staff and department contacts under an easy-to-navigate directory.
DecayMate
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Forget manual formulas and spreadsheet errors—get precise radioactive activity calculations instantly. DecayMate is a dedicated physics utility designed for laboratory reference and research. It streamlines the complex mathematics of radioactive decay, allowing you to focus on your inventory and calculations without the guesswork. KEY FEATURES: • Decay Calculator: Perform forward-decay calculations instantly. Input a starting activity and calculate exactly what remains after minutes, hours, or days based on standard exponential decay laws. • Target Activity Planner: Need a specific activity level at a future time? Use the backward-calculation tool to determine exactly the initial activity required to reach your target based on the isotope's half-life. • Live Tracker: Pin an active source and monitor its decay in real-time. Watch the activity decrease second-by-second on the live dashboard or via Home Screen widgets. • Custom Library: Comes pre-loaded with standard isotopes (Tc-99m, F-18, I-131, Cs-137, etc.). Need a specific radionuclide? Create and save custom isotopes with your own precise half-life definitions. • Unit Converter: Seamlessly toggle calculations between Curies (mCi, Ci) and Becquerels (MBq, GBq) anywhere in the application. • Privacy First: DecayMate operates entirely offline. Your custom isotope data and calculations are processed locally on your device and are never transmitted to the cloud.
Screenshots
Verdict
The clearest difference is update cadence: DecayMate at every 5 weeks against USD 243's every 4 months. USD 243's advantage is iOS requirement (16.0 vs 26.0). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
USD 243 ships an update every 4 months, DecayMate every 5 weeks. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.
| Parameter | USD 243 | DecayMate |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone |
| Requires iOS | 16.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 143 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Lebo Waverly Unified School District 243 | Ludovico Pestarino |
In-app purchases
USD 243
No in-app purchases
DecayMate
No in-app purchases









