Comparison

Radiotherapy Tools vs Decay Lab

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

Head to head
About

Radiotherapy Tools

Features
Read full description

RT Tools is a comprehensive radiation therapy planning assistant designed specifically for radiation oncologists and medical physicists. This powerful tool streamlines your workflow and enhances treatment planning accuracy with advanced visualization and analysis features. FREE FEATURES: -Biologically Effective Dose (BED) calculator -EQD2 (Equivalent Dose in 2Gy) calculator -Support for custom α/β ratios -Quick access to saved calculations PREMIUM FEATURES (requires subscription): -RT Plan Management with customizable constraint tables -NEW: TPS Connection for secure viewing of anonymized patient data -NEW: Dose-Volume Histogram (DVH) visualization and analysis -NEW: Target coverage analysis with prescription dose evaluation -NEW: Structure Aliases system for standardizing structure naming -NEW: PDF report generation with comprehensive plan evaluation -NEW: Realtime Notifications -Comprehensive OAR (Organs At Risk) database -Region-specific filtering system -Import/export capability for constraint tables -Multi-tab interface for easy comparison -Radiation Decay Calculator (RDC) with validated models -Evidence-based constraints from QUANTEC and AAPM TG-101 -Detailed results history with date tracking -Multi-organ calculation support SUBSCRIPTION INFORMATION: -Annual subscription -Payment will be charged to your account -Subscription automatically renews unless canceled at least 24 hours before the end of the current period -Account will be charged for renewal within 24 hours prior to the end of the current period -Includes a 7-day free trial for new subscribers Perfect for: -Radiation Oncologists -Medical Physicists -Dosimetrists -Radiation Therapy Residents -Medical Physics Students Built with precision and attention to detail, RT Tools helps ensure accurate treatment planning while saving valuable time in your clinical workflow. Empowering radiation oncology professionals with precise treatment planning calculations, comprehensive constraint management tools, and advanced visualization capabilities. Apple Standard Eula:https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of Use: https://sites.google.com/view/radiotherapy-tools/support/terms-of-use Privacy Policy: https://sites.google.com/view/radiotherapy-tools/support/privacy-policy

About

Decay Lab

This tool simplifies radionuclide decay calculations and radiation unit conversions. It's designed for professionals and students in nuclear medicine and related fields, offering a focused, offline workflow for quick and consistent results.

Highlights
  • Radioactive decay calculations
  • Activity at different times
  • Decay corrections
  • Bq/Ci unit conversions
  • Absorbed/equivalent dose conversions
  • Dose rate conversions
  • Built-in nuclide data
Features
Read full description

DecayLab makes radionuclide decay calculations and radiation unit conversions quick and straightforward. Designed for nuclear medicine professionals, researchers, educators, and students, it provides a clean, focused workflow that works entirely offline. Key features: • Calculate radioactive decay for a wide range of radionuclides • View activity at different reference and calculation times • Apply decay corrections quickly and consistently • Work with Bq, kBq, MBq, GBq and TBq, alongside nCi, µCi, mCi and Ci • Convert absorbed dose in Gy and rad, and equivalent dose in Sv and rem • Convert dose rates per second, minute, hour or day • See one value in every other unit at once, rather than one pair at a time • Access built-in radionuclide half-life data for 1,625 nuclides • Use all calculation features without an internet connection Gray and sievert are kept in separate tables. Converting between them requires a radiation weighting factor, which is a judgement about radiation type rather than a unit conversion, so DecayLab does not offer it. DecayLab is useful for: • Nuclear medicine technologists • Medical physicists • Radiation safety professionals • Researchers and educators • Students in nuclear medicine and related fields Whether you're checking an activity value, preparing calculations for a workflow, or studying radioactive decay, DecayLab keeps the process clear and efficient. Important: DecayLab is a calculation and educational tool. Results should be independently verified before being used in clinical, diagnostic, therapeutic, or safety-critical decisions.

Screenshots

Radiotherapy Tools4 screens
Decay Lab4 screens

Verdict

The call

The clearest difference is price: Decay Lab at Free against Radiotherapy Tools's $17.99. Decay Lab also leads on in-app purchases (none vs 1) and update cadence (every 4 days vs every 2 weeks). On ads, device support and iOS requirement 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

Decay Lab is free to download; Radiotherapy Tools costs $17.99 up front. Radiotherapy Tools sells 1 in-app purchase, starting at $29.99 per year. Decay Lab asks for nothing beyond the download.

UpkeepUpdate frequency

Radiotherapy Tools ships an update every 2 weeks, Decay Lab every 4 days. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

Scorecard3 real differences · 6 level
Radiotherapy Tools versus Decay Lab: the parameters behind the verdict, then further details
ParameterRadiotherapy ToolsDecay Lab
Price$17.99Free — better
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 2 weeksEvery 4 days — better
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhone, iPadiPhone, iPad
Requires iOS1717.0
Further details — not scored
Size29 MB6 MB
Age rating12+4+
DeveloperYavuz ErolCarlos Uribe

In-app purchases

1 purchases

Radiotherapy Tools

Subscriptions1
  • Premium Plan7 Days trial$29.991 Year
None

Decay Lab

No in-app purchases

Questions

Is Radiotherapy Tools free?
Radiotherapy Tools costs $17.99, and also offers in-app purchases.
Is Decay Lab free?
Decay Lab is free to download, with no in-app purchases.
Do Radiotherapy Tools or Decay Lab have ads?
Neither Radiotherapy Tools nor Decay Lab shows ads.
Which is updated more often, Radiotherapy Tools or Decay Lab?
Radiotherapy Tools ships an update every 2 weeks, and Decay Lab every 4 days. Most recently, Radiotherapy Tools was updated on October 25, 2026 and Decay Lab on October 28, 2026.

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