# Millimeters to Centimeters vs BulletCalc3

The clearest difference is update cadence: BulletCalc3 at every 2 months against Millimeters to Centimeters's every 9 months. Millimeters to Centimeters's advantage is iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Millimeters to Centimeters costs $0.99 and BulletCalc3 $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Millimeters to Centimeters ships an update every 9 months, BulletCalc3 every 2 months. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Millimeters to Centimeters | BulletCalc3 |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/bulletcalc3/id1660120327/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 months** |
| Monetization | — | Paid |
| Size | 7 MB | 6 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Thomas Pelster](https://appshunter.io/developer/429002805) | [Jack McCormack](https://appshunter.io/developer/1658121467) |

## What reviewers say

### Millimeters to Centimeters

[App page](https://appshunter.io/ios/app/millimeters-to-centimeters/id1065076235)

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

**In-app purchases:** none


### BulletCalc3

[App page](https://appshunter.io/ios/app/bulletcalc3/id1660120327)

Calculate ballistic trajectories for firearms with detailed charts and data. Offers metric and imperial units, automatic calculation of bullet drop, energy, and velocity at various ranges. Includes features for adjusting gun sight zero and measuring slant angles.

**Highlights:** Metric/Imperial unit support, Dynamic ballistic charts, Automatic FPS/Energy/Drop calculation, Gun sight zero adjustment, Slant angle measurement, Web search for bullet specs, Export distance data

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

**In-app purchases:** none


## Frequently asked questions

### Is Millimeters to Centimeters free?

Millimeters to Centimeters costs $0.99, with no in-app purchases.

### Is BulletCalc3 free?

BulletCalc3 costs $0.99, with no in-app purchases.

### Do Millimeters to Centimeters or BulletCalc3 have ads?

Neither Millimeters to Centimeters nor BulletCalc3 shows ads.

### Which is updated more often, Millimeters to Centimeters or BulletCalc3?

Millimeters to Centimeters ships an update every 9 months, and BulletCalc3 every 2 months. Most recently, Millimeters to Centimeters was updated on October 9, 2026 and BulletCalc3 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.*