# JOSLITZ vs Lab Junk

The clearest difference is in-app purchases: Lab Junk at none against JOSLITZ's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. JOSLITZ sells 1 one-off in-app purchase. Lab Junk asks for nothing beyond the download.

JOSLITZ ships an update every 9 months, Lab Junk every 7 months. The most recent releases landed on October 20, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | JOSLITZ | Lab Junk |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 7 months** |
| Monetization | — | Free |
| Size | 3 MB | 108 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Masayuki Ishizuka](https://appshunter.io/developer/330537039) | [Martin Rosenthal](https://appshunter.io/developer/1728895149) |

## What reviewers say

### JOSLITZ

[App page](https://appshunter.io/ios/app/joslitz/id6472687919)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Neon Block | $0.99 | one-time |


### Lab Junk

[App page](https://appshunter.io/ios/app/lab-junk/id6741333587)

Embark on a Metroidvania-style adventure as BALL and PADDLE escape a derelict lab. Discover hidden items and unique abilities to overcome enemies and solve puzzles. This challenging game requires strategy and exploration, honoring the spirit of classic 80s and 90s gaming.

**Highlights:** Metroidvania-style gameplay, Challenging puzzles, Hidden items and abilities, Boss battles, Offline play, Retro gaming inspired

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is JOSLITZ free?

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

### Is Lab Junk free?

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

### Do JOSLITZ or Lab Junk have ads?

Neither JOSLITZ nor Lab Junk shows ads.

### Which is updated more often, JOSLITZ or Lab Junk?

JOSLITZ ships an update every 9 months, and Lab Junk every 7 months. Most recently, JOSLITZ was updated on October 20, 2026 and Lab Junk on October 18, 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.*