Comparison

Decay Lab vs Euler Gamma

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
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.

About

Euler Gamma

Features
Read full description

The all-in-one calculator suite for industrial gamma radiography professionals. Whether you're planning an exposure, calculating safety boundaries, or verifying ASME compliance — Euler Gamma delivers accurate results instantly, right from your pocket. Trusted by NDT technicians, RSOs, and radiography crews worldwide. WHAT YOU GET • Decay Calculator — Activity remaining after any elapsed time for Ir-192, Se-75, and Co-60 • Dose Rate Calculator — Inverse-square law with real-time results in mR/hr, µSv/hr, and more • Barricade Calculator — Safety boundary distances per NRC 10 CFR 20 guidelines • HVL Shielding Calculator — Half-Value Layer attenuation for Steel, Lead, Concrete, and more • Unsharpness Calculator — Geometric unsharpness (Ug) with ASME V Article 2 pass/fail checks • Reference Data — Built-in gamma constants, material properties, and occupancy factors BUILT FOR THE FIELD • Works offline — no internet required at the job site • Clean, fast interface designed for one-handed use • Supports both SI and US customary units • Results you can screenshot and share instantly COMPLIANCE YOU CAN TRUST Physical constants validated against NIST, ICRP, and NRC publications. ASME Section V limits built-in. Know your numbers are right — every single time. Download Euler Gamma today and make every shot safer and more precise.

Screenshots

Decay Lab4 screens
Euler Gamma4 screens

Verdict

The call

The clearest difference is update cadence: Decay Lab at every 4 days against Euler Gamma's every 9 days. 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, Euler Gamma every 9 days. The most recent releases landed on September 15, 2026 and September 9, 2026 respectively.

Scorecard1 real difference · 5 level
Decay Lab versus Euler Gamma: the parameters behind the verdict, then further details
ParameterDecay LabEuler Gamma
PriceFreeFree
Update frequencyEvery 4 days — betterEvery 9 days
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.017.0
Further details — not scored
Size6 MB14 MB
Age rating4+4+
DeveloperCarlos Uribe音 卢

In-app purchases

None

Decay Lab

No in-app purchases

None

Euler Gamma

No in-app purchases

Questions

Is Decay Lab free?
Decay Lab is free to download, with no in-app purchases.
Is Euler Gamma free?
Euler Gamma is free to download, with no in-app purchases.
Do Decay Lab or Euler Gamma have ads?
Neither Decay Lab nor Euler Gamma shows ads.
Which is updated more often, Decay Lab or Euler Gamma?
Decay Lab ships an update every 4 days, and Euler Gamma every 9 days. Most recently, Decay Lab was updated on September 15, 2026 and Euler Gamma on September 9, 2026.

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