# 一発修正君 vs Flm∴S アイソメmaster

The clearest difference is review sentiment: 一発修正君 at 100% against Flm∴S アイソメmaster's 0%. 一発修正君 also leads on in-app purchases (none vs 2). Flm∴S アイソメmaster's advantage is update cadence (every 11 days vs every 11 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Flm∴S アイソメmaster sells 2 in-app purchases, starting at $3.99 per month. 一発修正君 asks for nothing beyond the download.

一発修正君 ships an update every 11 months, Flm∴S アイソメmaster every 11 days. The most recent releases landed on October 26, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 一発修正君 | Flm∴S アイソメmaster |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 11 days** |
| Monetization | — | Free |
| Size | 6 MB | 41 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [yoshida kogyo,y.k.](https://appshunter.io/developer/1076229459) | [shinji miyagawa](https://appshunter.io/developer/6791523364) |

## What reviewers say

### 一発修正君

[App page](https://appshunter.io/ios/app/id1076229460)

**Features:** Vision Pro support

**In-app purchases:** none


### Flm∴S アイソメmaster

[App page](https://appshunter.io/ios/app/flms-master/id6791523361)

This app simplifies the creation of piping isometric drawings (spool drawings) for construction and fabrication sites. It replaces manual drafting and CAD software with a tablet-based tool, allowing users to easily place symbols and automatically calculate dimensions for efficient workflow.

**Highlights:** Piping and fitting symbols, Automatic cut length calculation, Part numbering and material lists, Vector PDF output for site use, Underlay image support, Project saving and sharing

**Features:** iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月額サブスクリプション | $3.99 | per month |
| 全機能アンロック（買い切り） | $19.99 | one-time |


## Frequently asked questions

### Is 一発修正君 free?

一発修正君 is free to download, with no in-app purchases.

### Is Flm∴S アイソメmaster free?

Flm∴S アイソメmaster is free to download, with in-app purchases available.

### Do 一発修正君 or Flm∴S アイソメmaster have ads?

Neither 一発修正君 nor Flm∴S アイソメmaster shows ads.

### Which is updated more often, 一発修正君 or Flm∴S アイソメmaster?

一発修正君 ships an update every 11 months, and Flm∴S アイソメmaster every 11 days. Most recently, 一発修正君 was updated on October 26, 2026 and Flm∴S アイソメmaster on October 29, 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.*