# Currency&Unit Conversions vs Flash Charge HK

The clearest difference is in-app purchases: Flash Charge HK at none against Currency&Unit Conversions's 1. Currency&Unit Conversions's advantage is iOS requirement (7.0 vs 14.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Currency&Unit Conversions sells 1 one-off in-app purchase. Flash Charge HK asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 1, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Currency&Unit Conversions | Flash Charge HK |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (50 ratings)](https://appshunter.io/ios/app/currency-and-unit-conversions/id405496989/reviews)** | — |
| Number of ratings | **50** | — |
| Positive reviews | 79.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 17 MB | 90 MB |
| Requires iOS | **7.0** | 14.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [38 Softworks Inc.](https://appshunter.io/developer/314907529) | [LHC New Energy Company Limited](https://appshunter.io/developer/1567326674) |

## What reviewers say

### Currency&Unit Conversions

[App page](https://appshunter.io/ios/app/currency-and-unit-conversions/id405496989)

Easily convert between various units and currencies, saving your calculations for later. View all your past conversions in one place, eliminating the need to re-enter data. Supports a wide range of categories including temperature, length, area, volume, and weight.

**Highlights:** Save conversion history, View all conversions at once, Temperature conversion, Currency conversion (158 currencies), Length, Area, Volume, Weight conversions, Supports Foot + Inch and Pound + Ounce

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove All Ads | $1.99 | one-time |

**What reviewers like**

- 👍 Easy to use interface
- 🔄 Works every time
- 🌟 Highly recommended converter
- 💡 Excellent learning tool
- ⚡ Fast and versatile

**What reviewers complain about**

- 📢 Loud, annoying button sounds
- 💸 Frequent, intrusive ads
- 📉 Inaccurate currency conversion
- 🚫 Missing specific conversion types

**Reported bugs**

- Currency not loading
- App crashes instantly
- App won't open

**Requested features**

- Absolute temperature conversions
- Kelvin temperature option


### Flash Charge HK

[App page](https://appshunter.io/ios/app/flash-charge-hk/id6748899216)

**In-app purchases:** none


## Frequently asked questions

### Is Currency&Unit Conversions free?

Currency&Unit Conversions is free to download, with in-app purchases available.

### Is Flash Charge HK free?

Flash Charge HK is free to download, with no in-app purchases.

### Do Currency&Unit Conversions or Flash Charge HK have ads?

Neither Currency&Unit Conversions nor Flash Charge HK shows ads.

### Which is updated more often, Currency&Unit Conversions or Flash Charge HK?

Currency&Unit Conversions ships an update every 2 months, and Flash Charge HK every 2 months. Most recently, Currency&Unit Conversions was updated on November 1, 2026 and Flash Charge HK on October 28, 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.*