Comparison

Decay Lab vs Fox RT Guide

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

Head to head
About

Decay Lab

Features
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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.

About

Fox RT Guide

Features
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Fox RT Guide is the essential companion app for NDT radiography professionals. Whether you work with Film, CR (Computed Radiography), or DR (Digital Radiography) systems, this app puts critical tools and references right in your pocket — on-site and beyond. EXPOSURE CALCULATOR • Recommended mode: Enter material, thickness, and distance — get optimized kV, mA, and focal spot recommendations • Manual mode: Calculate exposure times for X-Ray and isotope sources (Ir-192, Co-60, Se-75, Tm-170) • Supports Film, CR, and DR detectors with ISO 17636-2 compliant geometric unsharpness (Ug) validation • Save and reload up to 10 calculations STANDARDS REFERENCE • Quick-access database of 15+ major NDT standards • Covers ASME, ASTM, ISO, AWS, API, and ASNT codes • Key requirements summary with direct links to official standards bodies TECHNIQUE CHARTS • Material-specific exposure parameters for Carbon Steel, Stainless Steel, and Aluminum • Charts for X-Ray, Ir-192, and Co-60 sources • Separate data for Film (ISO 17636-1), CR, and DR (ISO 17636-2) DICOM / DICONDE IMAGE VIEWER • Open DICOM and standard image files • Window/Level adjustment, zoom, pan, rotate, and flip controls • On-image measurement tool with mm/inch calibration • Full DICOM tag browser with search IQI / PENETRAMETER GUIDE • ASTM E1025 hole-type penetrameter lookup • ISO 19232-1 Wire IQI (W1–W19) reference • ISO 19232-5 Duplex Wire IQI (D1–D13) with SRb requirements SAFETY CALCULATOR • Safe distance calculations for X-Ray and isotope sources • Shielding requirements for lead, concrete, and steel • ALARA guidelines and dose rate reference ADDITIONAL TOOLS • Film Selection Guide — thickness-based film recommendations per ISO 11699-1 • Density Guide — interactive density reference with acceptance ranges • Geometric Unsharpness Calculator — Ug calculation with ISO 17636-2 quality ratings • Defect Interpretation Guide — weld, casting, forging, and processing defects with acceptance criteria per ASME, AWS, API, and ISO codes • Unit Converter — Length, Radioactivity, Dose, Pressure, Temperature, Film Density, and Distance • Detector Performance — DQE, MTF tables, calibration procedures, and Film vs CR vs DR comparison RT QUIZ • 60 questions across 6 categories for ASNT Level I, II, and III certification preparation • Categories: RT Fundamentals, Equipment & Setup, Image Quality, Standards & Codes, Safety, and Defect Interpretation • Instant feedback with detailed explanations • Score tracking with category breakdown Designed by Foxes, for NDT professionals. © 2026 Mind Fox Software Solutions Pvt Ltd

Screenshots

Decay Lab4 screens
Fox RT Guide4 screens

Verdict

The call

The clearest difference is update cadence: Decay Lab at every 4 days against Fox RT Guide's every 6 weeks. 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

Decay Lab ships an update every 4 days, Fox RT Guide every 6 weeks. The most recent releases landed on October 2, 2026 and September 27, 2026 respectively.

Scorecard1 real difference · 5 level
Decay Lab versus Fox RT Guide: the parameters behind the verdict, then further details
ParameterDecay LabFox RT Guide
PriceFreeFree
Update frequencyEvery 4 days — betterEvery 6 weeks
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better18.6
Further details — not scored
Size6 MB3 MB
Age rating4+4+
DeveloperCarlos UribeMind Fox Software Solutions Private Limited

In-app purchases

None

Decay Lab

No in-app purchases

None

Fox RT Guide

No in-app purchases

Questions

Is Decay Lab free?
Decay Lab is free to download, with no in-app purchases.
Is Fox RT Guide free?
Fox RT Guide is free to download, with no in-app purchases.
Do Decay Lab or Fox RT Guide have ads?
Neither Decay Lab nor Fox RT Guide shows ads.
Which is updated more often, Decay Lab or Fox RT Guide?
Decay Lab ships an update every 4 days, and Fox RT Guide every 6 weeks. Most recently, Decay Lab was updated on October 2, 2026 and Fox RT Guide on September 27, 2026.

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