# 555 Calc vs GPSメモ

The clearest difference is update cadence: GPSメモ at every 4 months against 555 Calc's every 20 months. 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.

555 Calc ships an update every 20 months, GPSメモ every 4 months. The most recent releases landed on October 13, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 555 Calc | GPSメモ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (3 ratings)](https://appshunter.io/ios/app/555-calc/id868058244/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 20 months | **Every 4 months** |
| Monetization | Ad-supported | — |
| Size | 18 MB | 65 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jibiki Works](https://appshunter.io/developer/556845808) | [kazuya koshiyama](https://appshunter.io/developer/1477982094) |

## What reviewers say

### 555 Calc

[App page](https://appshunter.io/ios/app/555-calc/id868058244)

This utility app helps engineers and hobbyists calculate resistor values for circuits using the Timer IC 555. Simply input frequency, duty ratio, and capacitor values to get the required resistor outputs.

**Highlights:** Calculate resistor values, Input frequency, Input duty ratio, Input capacitor value, Timer IC 555 circuit design

**Features:** macOS Compatibility

**In-app purchases:** none


### GPSメモ

[App page](https://appshunter.io/ios/app/gps/id1588373523)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 555 Calc free?

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

### Is GPSメモ free?

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

### Do 555 Calc or GPSメモ have ads?

Both 555 Calc and GPSメモ show ads.

### Which is updated more often, 555 Calc or GPSメモ?

555 Calc ships an update every 20 months, and GPSメモ every 4 months. Most recently, 555 Calc was updated on October 13, 2026 and GPSメモ on October 9, 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.*