# Proof Recorder vs VOLTsボルツ・電工システム屋計算・現場便利ツール

The clearest difference is in-app purchases: Proof Recorder at none against VOLTsボルツ・電工システム屋計算・現場便利ツール's 1. VOLTsボルツ・電工システム屋計算・現場便利ツール's advantage is update cadence (daily vs every 10 days) and iOS requirement (16.6 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. VOLTsボルツ・電工システム屋計算・現場便利ツール sells 1 one-off in-app purchase. Proof Recorder asks for nothing beyond the download.

Proof Recorder ships an update every 10 days, VOLTsボルツ・電工システム屋計算・現場便利ツール daily. The most recent releases landed on November 9, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Proof Recorder | VOLTsボルツ・電工システム屋計算・現場便利ツール |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 10 days | **Daily** |
| Size | 12 MB | 9 MB |
| Requires iOS | 18.0 | **16.6** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Saturn Studio](https://appshunter.io/developer/1491356325) | [TAKAO OGASAWARA](https://appshunter.io/developer/1895349758) |

## What reviewers say

### Proof Recorder

[App page](https://appshunter.io/ios/app/proof-recorder-save-and-email/id6761300996)

**In-app purchases:** none


### VOLTsボルツ・電工システム屋計算・現場便利ツール

[App page](https://appshunter.io/ios/app/volts/id6767616532)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告を削除 | $3.99 | one-time |


## Frequently asked questions

### Is Proof Recorder free?

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

### Is VOLTsボルツ・電工システム屋計算・現場便利ツール free?

VOLTsボルツ・電工システム屋計算・現場便利ツール is free to download, with in-app purchases available.

### Do Proof Recorder or VOLTsボルツ・電工システム屋計算・現場便利ツール have ads?

Both Proof Recorder and VOLTsボルツ・電工システム屋計算・現場便利ツール show ads.

### Which is updated more often, Proof Recorder or VOLTsボルツ・電工システム屋計算・現場便利ツール?

Proof Recorder ships an update every 10 days, and VOLTsボルツ・電工システム屋計算・現場便利ツール daily. Most recently, Proof Recorder was updated on November 9, 2026 and VOLTsボルツ・電工システム屋計算・現場便利ツール on November 5, 2026.

---

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