# FieldLogger vs CORE Calculator App

The clearest difference is in-app purchases: FieldLogger at none against CORE Calculator App's 3. FieldLogger also leads on update cadence (every 3 weeks vs every 3 months) and iOS requirement (8.0 vs 14.0). On price, 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. FieldLogger asks for nothing beyond the download.

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

## The numbers

| Metric | FieldLogger | CORE Calculator App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (11 ratings)](https://appshunter.io/ios/app/core-calculator-app/id1447118499/reviews)** |
| Number of ratings | — | **11** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | — | Free with in-app purchases |
| Size | 17 MB | 148 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Artesia](https://appshunter.io/developer/924565720) | [AsInt Inc.](https://appshunter.io/developer/1438397626) |

## What reviewers say

### FieldLogger

[App page](https://appshunter.io/ios/app/fieldlogger/id924565721)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 FieldLogger free?

FieldLogger 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.

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

Neither FieldLogger nor CORE Calculator App shows ads.

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

FieldLogger ships an update every 3 weeks, and CORE Calculator App every 3 months. Most recently, FieldLogger was updated on October 13, 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.*