# Calm Lock vs Cementing Engineer

Calm Lock and Cementing Engineer are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Calm Lock sells 2 in-app purchases, starting at $7.99 per month and Cementing Engineer sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Calm Lock ships an update every 9 days, Cementing Engineer fortnightly. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Calm Lock | Cementing Engineer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/cementing-engineer/id6779455442/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Fortnightly |
| Monetization | — | Subscription |
| Size | 41 MB | 18 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mitesh Yadav](https://appshunter.io/developer/1782834525) | [Rondo Wright](https://appshunter.io/developer/6779455444) |

## What reviewers say

### Calm Lock

[App page](https://appshunter.io/ios/app/calm-lock-mindful-app-blocker/id6759690166)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| usa | $7.99 | per month |
| usa | $49.99 | per year |


### Cementing Engineer

[App page](https://appshunter.io/ios/app/cementing-engineer/id6779455442)

This app is a field calculator for oilfield cementing operations. It allows users to input wellbore geometry and slurry details to get live, updated calculations for volumes, pressures, and pump schedules. The app also features a live well schematic and a tally book for saving and recalling job details.

**Highlights:** Field calculator for oilfield cementing, Live, updating calculations for volumes and pressures, Wellbore geometry and slurry stack input, Derived results with detailed math, Live well schematic, Tally Book for saving and recalling jobs, Offline functionality

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $9.99 | per month |
| Pro Annual | $79.99 | per year |


## Frequently asked questions

### Is Calm Lock free?

Calm Lock is free to download, with in-app purchases available.

### Is Cementing Engineer free?

Cementing Engineer is free to download, with in-app purchases available.

### Do Calm Lock or Cementing Engineer have ads?

Neither Calm Lock nor Cementing Engineer shows ads.

### Which is updated more often, Calm Lock or Cementing Engineer?

Calm Lock ships an update every 9 days, and Cementing Engineer fortnightly. Most recently, Calm Lock was updated on October 7, 2026 and Cementing Engineer on October 24, 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.*