# Jet Ski Addition vs LJCDS100

The clearest difference is price: LJCDS100 at Free against Jet Ski Addition's $0.99. LJCDS100 also leads on rating (5.0 vs 3.5) and update cadence (every 5 weeks vs every 22 months). Jet Ski Addition's advantage is ratings volume (19 vs 1) and iOS requirement (6.0 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

LJCDS100 is free to download; Jet Ski Addition costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

LJCDS100 holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: Jet Ski Addition has 19 ratings behind it against 1, so its average is the more settled of the two.

Jet Ski Addition ships an update every 22 months, LJCDS100 every 5 weeks. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Jet Ski Addition | LJCDS100 |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.5 (19 ratings)](https://appshunter.io/ios/app/jet-ski-addition/id489673522/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ljcds100/id6748926308/reviews)** |
| Number of ratings | **19** | 1 |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 5 weeks** |
| Monetization | Paid | **Free** |
| Size | 24 MB | 65 MB |
| Requires iOS | **6.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Arcademics](https://appshunter.io/developer/489673525) | [La Jolla Country Day School](https://appshunter.io/developer/1399284058) |

## What reviewers say

### Jet Ski Addition

[App page](https://appshunter.io/ios/app/jet-ski-addition/id489673522)

Race jet skis against other players worldwide while practicing addition facts. Your speed depends on how quickly you solve math problems. A fun way to improve arithmetic skills.

**Highlights:** Multiplayer racing, Addition fact practice, Speed based on math answers, Global competition, Educational gameplay

**Features:** macOS Compatibility

**In-app purchases:** none


### LJCDS100

[App page](https://appshunter.io/ios/app/ljcds100/id6748926308)

This app celebrates a school's 100th anniversary by allowing users to share memories, view event details, and receive timely notifications. It serves as a digital hub for community connection during the historic Centennial celebration.

**Highlights:** Centennial Memory Share with stickers and tags, Upload photos and videos, Events Calendar for anniversary celebrations, Push notifications for events and news, Community connection hub, No login required

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

**In-app purchases:** none


## Frequently asked questions

### Is Jet Ski Addition free?

Jet Ski Addition costs $0.99, with no in-app purchases.

### Is LJCDS100 free?

LJCDS100 is free to download, with no in-app purchases.

### Which has better reviews, Jet Ski Addition or LJCDS100?

LJCDS100 is rated higher. Jet Ski Addition averages 3.5 out of 5 from 19 ratings, while LJCDS100 averages 5.0 from 1 ratings.

### Do Jet Ski Addition or LJCDS100 have ads?

Neither Jet Ski Addition nor LJCDS100 shows ads.

### Which is updated more often, Jet Ski Addition or LJCDS100?

Jet Ski Addition ships an update every 22 months, and LJCDS100 every 5 weeks. Most recently, Jet Ski Addition was updated on November 1, 2026 and LJCDS100 on October 30, 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.*