# FishDays vs STEM Line Builder

The clearest difference is update cadence: STEM Line Builder at weekly against FishDays's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

FishDays ships an update monthly, STEM Line Builder weekly. The most recent releases landed on June 14, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | FishDays | STEM Line Builder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Size | 42 MB | 98 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [zukan.com Inc.](https://appshunter.io/developer/791100929) | [Ryo Ogasawara](https://appshunter.io/developer/6793957355) |

## What reviewers say

### FishDays

[App page](https://appshunter.io/ios/app/fishdays/id1610672069)

**In-app purchases:** none


### STEM Line Builder

[App page](https://appshunter.io/ios/app/stem-line-builder-longboard/id6793957353)

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

**In-app purchases:** none


## Frequently asked questions

### Is FishDays free?

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

### Is STEM Line Builder free?

STEM Line Builder is free to download, with no in-app purchases.

### Do FishDays or STEM Line Builder have ads?

Neither FishDays nor STEM Line Builder shows ads.

### Which is updated more often, FishDays or STEM Line Builder?

FishDays ships an update monthly, and STEM Line Builder weekly. Most recently, FishDays was updated on June 14, 2026 and STEM Line Builder on September 23, 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.*