# X vs CORE Calculator App

The clearest difference is in-app purchases: X at none against CORE Calculator App's 3. X also leads on iOS requirement (8.0 vs 14.0). CORE Calculator App's advantage is review sentiment (100% vs 76%) and update cadence (every 3 months vs every 13 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. CORE Calculator App sells 3 in-app purchases, starting at $4.99 per month. X asks for nothing beyond the download.

CORE Calculator App holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 8 and 11 respectively. Written reviews point the same way: 76% of X's written reviews are positive against 100% of CORE Calculator App's.

X ships an update every 13 months, CORE Calculator App every 3 months. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | X | CORE Calculator App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (8 ratings)](https://appshunter.io/ios/app/x-ray-timer/id350390647/reviews) | **[5.0 (11 ratings)](https://appshunter.io/ios/app/core-calculator-app/id1447118499/reviews)** |
| Number of ratings | 8 | **11** |
| Positive reviews | 75.8% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 3 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 0 MB | 148 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lance Henderson](https://appshunter.io/developer/348247919) | [AsInt Inc.](https://appshunter.io/developer/1438397626) |

## What reviewers say

### X

[App page](https://appshunter.io/ios/app/x-ray-timer/id350390647)

Calculate radiography shot times for industrial radiographers using radioactive materials. Quickly determine exposure time by inputting curies, steel thickness, and source-to-film distance.

**Highlights:** Calculate radiography shot times, Supports Iridium and Cobalt sources, Input curies, thickness, and distance, Field-tested for accuracy, Replaces slide rule calculations

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Saves time and effort
- 🚀 Works great and is accurate
- 👍 Easy to use
- 👍 Reliable for daily work
- 👍 Helpful for training

**What reviewers complain about**

- 🐛 Bugs and crashes
- 🐛 Calculations can be off
- 🐛 Inconsistent results
- 🐛 App crashes on iOS 10
- 🐛 Doesn't work for large pipes

**Reported bugs**

- Crashes if 2 or more fields have a period in it on iOS 10
- App stopped working after recent iOS update
- Shot times are way off when shooting large pipes
- App does not work, inconsistent results with different units or conversions
- Exposure time not correct

**Requested features**

- Save recent calculations
- Memory feature for recent calculations
- Add feature for double/single wall application
- Show density climbing on countdown
- Add wire type selection


### CORE Calculator App

[App page](https://appshunter.io/ios/app/core-calculator-app/id1447118499)

This app provides inspectors in the oil and gas industry with essential calculations for asset integrity. It offers tools for determining Tmin, MAWP, corrosion rates, and remaining life based on industry standards.

**Highlights:** Tmin calculations, MAWP calculations, Corrosion rate calculations, Remaining life determination, Construction material information, Damage mechanism identification

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Materials Lookup | $4.99 | per month |
| Damage Mech Screener | $9.99 | per month |
| Materials Lookup | $5.99 | one-time |


## Frequently asked questions

### Is X free?

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

### Is CORE Calculator App free?

CORE Calculator App is free to download, with in-app purchases available.

### Which has better reviews, X or CORE Calculator App?

CORE Calculator App is rated higher. X averages 4.8 out of 5 from 8 ratings, while CORE Calculator App averages 5.0 from 11 ratings.

### Do X or CORE Calculator App have ads?

Neither X nor CORE Calculator App shows ads.

### Which is updated more often, X or CORE Calculator App?

X ships an update every 13 months, and CORE Calculator App every 3 months. Most recently, X was updated on October 16, 2026 and CORE Calculator App on October 17, 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.*