# iDCalc vs misTMJ

The clearest difference is price: misTMJ at Free against iDCalc's $2.99. misTMJ also leads on update cadence (monthly vs every 8 months) and iOS requirement (11.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

misTMJ is free to download; iDCalc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iDCalc ships an update every 8 months, misTMJ monthly. The most recent releases landed on August 14, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | iDCalc | misTMJ |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/idcalc/id556863722/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Monthly** |
| Monetization | Paid | — |
| Size | 2 MB | 594 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Mevis Informática Médica Ltda.](https://appshunter.io/developer/556863725) | [Himalaya Computing](https://appshunter.io/developer/1205321932) |

## What reviewers say

### iDCalc

[App page](https://appshunter.io/ios/app/idcalc/id556863722)

This medical app assists radiotherapists and medical physicists with routine computations in radiation therapy and nuclear medicine. It offers tools for translating radiation quality specifications, calculating isotope decay, and determining equivalent square fields.

**Highlights:** Radiation quality specification translation, Isotope decay calculation, Equivalent square field computation, Percent Depth Dose (PDD) calculation, Normalized Peak Scatter Factor (NPSF) calculation, Built-in library of radiation beams

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### misTMJ

[App page](https://appshunter.io/ios/app/mistmj/id1592838220)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iDCalc free?

iDCalc costs $2.99, with no in-app purchases.

### Is misTMJ free?

misTMJ is free to download, with no in-app purchases.

### Do iDCalc or misTMJ have ads?

Neither iDCalc nor misTMJ shows ads.

### Which is updated more often, iDCalc or misTMJ?

iDCalc ships an update every 8 months, and misTMJ monthly. Most recently, iDCalc was updated on August 14, 2026 and misTMJ on September 18, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*