# Rocket Tracker vs Chemical memo

The clearest difference is in-app purchases: Rocket Tracker at none against Chemical memo's 1. Rocket Tracker also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). Chemical memo's advantage is update cadence (every 8 months vs every 62 months). On price and device support there is nothing between them.

Both are free to download. Chemical memo sells 1 one-off in-app purchase. Rocket Tracker asks for nothing beyond the download.

Rocket Tracker ships an update every 62 months, Chemical memo every 8 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Rocket Tracker | Chemical memo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/rocket-tracker/id455751461/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 62 months | **Every 8 months** |
| Monetization | Free | — |
| Size | 11 MB | 4 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jakob Adams](https://appshunter.io/developer/1268480296) | [zoome LLC](https://appshunter.io/developer/1541241247) |

## What reviewers say

### Rocket Tracker

[App page](https://appshunter.io/ios/app/rocket-tracker/id455751461)

This app helps model and high-power rocketeers meticulously track their rocket collections. Log physical details, engine compatibility, launch history, and repair needs. It also cross-references engines to compatible rockets, simplifying engine management.

**Highlights:** Track rocket physical characteristics, Log engine compatibility, Record launch history and engines used, Manage rocket repair needs, Cross-reference engines to compatible rockets

**Features:** Vision Pro support

**In-app purchases:** none


### Chemical memo

[App page](https://appshunter.io/ios/app/chemical-memo/id6457261727)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $3.99 | one-time |


## Frequently asked questions

### Is Rocket Tracker free?

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

### Is Chemical memo free?

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

### Do Rocket Tracker or Chemical memo have ads?

Chemical memo shows ads; Rocket Tracker does not.

### Which is updated more often, Rocket Tracker or Chemical memo?

Rocket Tracker ships an update every 62 months, and Chemical memo every 8 months. Most recently, Rocket Tracker was updated on October 24, 2026 and Chemical memo on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*