Comparison

USD 243 vs DecayMate

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

Head to head
About

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.

Highlights
  • Event calendar with sharing
  • Customizable student organization notifications
  • Weekly cafeteria menus
  • Live district updates feed
  • Staff and department directory
Read full description

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.

About

DecayMate

Features
Read full description

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

USD 2434 screens
DecayMate4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 7 level
USD 243 versus DecayMate: the parameters behind the verdict, then further details
ParameterUSD 243DecayMate
PriceFreeFree
Rating4.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 4 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhoneiPhone
Requires iOS16.0 — better26.0
Further details — not scored
Size143 MB1 MB
Age rating4+4+
DeveloperLebo Waverly Unified School District 243Ludovico Pestarino

In-app purchases

None

USD 243

No in-app purchases

None

DecayMate

No in-app purchases

Questions

Is USD 243 free?
USD 243 is free to download, with no in-app purchases.
Is DecayMate free?
DecayMate is free to download, with no in-app purchases.
Do USD 243 or DecayMate have ads?
Neither USD 243 nor DecayMate shows ads.
Which is updated more often, USD 243 or DecayMate?
USD 243 ships an update every 4 months, and DecayMate every 5 weeks. Most recently, USD 243 was updated on October 16, 2026 and DecayMate on October 9, 2026.

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