# CtrlF Pro vs Drilling Calculator for Rigs

The clearest difference is price: CtrlF Pro at Free against Drilling Calculator for Rigs's $1.99. Drilling Calculator for Rigs's advantage is in-app purchases (none vs 1) and update cadence (every 2 weeks vs every 6 weeks). On ads, device support and iOS requirement there is nothing between them.

CtrlF Pro is free to download; Drilling Calculator for Rigs costs $1.99 up front. CtrlF Pro sells 1 one-off in-app purchase. Drilling Calculator for Rigs asks for nothing beyond the download.

CtrlF Pro ships an update every 6 weeks, Drilling Calculator for Rigs every 2 weeks. The most recent releases landed on September 24, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | CtrlF Pro | Drilling Calculator for Rigs |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Size | 3 MB | 5 MB |
| Requires iOS | **17** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [贺 周](https://appshunter.io/developer/1815397078) | [Aneesh Pradeep](https://appshunter.io/developer/1836157821) |

## What reviewers say

### CtrlF Pro

[App page](https://appshunter.io/ios/app/ctrlf-pro/id6767729225)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CtrlF Pro | $4.99 | one-time |


### Drilling Calculator for Rigs

[App page](https://appshunter.io/ios/app/drilling-calculator-for-rigs/id6785307917)

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

**In-app purchases:** none


## Frequently asked questions

### Is CtrlF Pro free?

CtrlF Pro is free to download, with in-app purchases available.

### Is Drilling Calculator for Rigs free?

Drilling Calculator for Rigs costs $1.99, with no in-app purchases.

### Do CtrlF Pro or Drilling Calculator for Rigs have ads?

Neither CtrlF Pro nor Drilling Calculator for Rigs shows ads.

### Which is updated more often, CtrlF Pro or Drilling Calculator for Rigs?

CtrlF Pro ships an update every 6 weeks, and Drilling Calculator for Rigs every 2 weeks. Most recently, CtrlF Pro was updated on September 24, 2026 and Drilling Calculator for Rigs on September 10, 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.*