# Trajectory vs Zima

The clearest difference is in-app purchases: Trajectory at none against Zima's 6. Zima's advantage is ads (none vs shown) and update cadence (every 4 days vs fortnightly). On price and iOS requirement there is nothing between them.

Both are free to download. Zima sells 6 one-off in-app purchases. Trajectory asks for nothing beyond the download.

Trajectory ships an update fortnightly, Zima every 4 days. The most recent releases landed on October 30, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | Trajectory | Zima |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (4 ratings)](https://appshunter.io/ios/app/zima-ballistics-calculator/id6760805492/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 36 MB | 336 MB |
| Requires iOS | **17.7.2** | 18.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [ZIma Logistics LLC](https://appshunter.io/developer/1883563240) |

## What reviewers say

### Trajectory

[App page](https://appshunter.io/ios/app/trajectory-detection/id6511212764)

**Features:** macOS Compatibility

**In-app purchases:** none


### Zima

[App page](https://appshunter.io/ios/app/zima-ballistics-calculator/id6760805492)

This app provides advanced ballistics calculations for precision shooting, hunting, and reloading. It offers multiple solver models, drag options, and correction factors, with a free version for sample rifles and a Pro version for custom setups.

**Highlights:** Multiple solver models (3DOF, 4DOF, 6DOF, Pejsa), Extensive drag models and correction factors, Rifle, optic, and ammo library, 3D trajectory visualization, WEZ hit probability analysis, Reloading suite for ammo development, Training modes and drills

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ballistics Pro — 7-day Trial | Free | one-time |
| Ballistics: Small Tip | $0.99 | one-time |
| Ballistics: Medium Tip | $2.99 | one-time |
| Ballistics: Large Tip | $4.99 | one-time |
| Ballistics Pro — 6 Months | $14.99 | one-time |
| Ballistics Pro | $19.99 | one-time |


## Frequently asked questions

### Is Trajectory free?

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

### Is Zima free?

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

### Do Trajectory or Zima have ads?

Trajectory shows ads; Zima does not.

### Which is updated more often, Trajectory or Zima?

Trajectory ships an update fortnightly, and Zima every 4 days. Most recently, Trajectory was updated on October 30, 2026 and Zima on November 13, 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.*