# Implen NanoPhotometer vs Mercury

The clearest difference is in-app purchases: Implen NanoPhotometer at none against Mercury's 5. Implen NanoPhotometer also leads on update cadence (every 3 months vs every 70 months) and iOS requirement (10.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Mercury sells 5 one-off in-app purchases. Implen NanoPhotometer asks for nothing beyond the download.

Implen NanoPhotometer ships an update every 3 months, Mercury every 70 months. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Implen NanoPhotometer | Mercury |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (6 ratings)](https://appshunter.io/ios/app/mercury-temperature-converter/id1494415587/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 70 months |
| Monetization | — | Free |
| Size | 54 MB | 4 MB |
| Requires iOS | **10.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Implen Inc.](https://appshunter.io/developer/988716674) | [Samuel Herrera](https://appshunter.io/developer/962670797) |

## What reviewers say

### Implen NanoPhotometer

[App page](https://appshunter.io/ios/app/implen-nanophotometer/id988716675)

**Features:** macOS Compatibility

**In-app purchases:** none


### Mercury

[App page](https://appshunter.io/ios/app/mercury-temperature-converter/id1494415587)

Easily convert temperatures between Celsius, Fahrenheit, and Kelvin with an elegant and intuitive interface. Features dynamic background color changes based on temperature and supports decimal conversions.

**Highlights:** Celsius, Fahrenheit, Kelvin conversion, Interactive temperature scrolling, Dynamic background color, Reset to zero function, Decimal temperature support

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Remove Ads | $1.99 | one-time |
| Medium Tip | $2.99 | one-time |
| Large Tip | $4.99 | one-time |
| Massive Tip | $9.99 | one-time |


## Frequently asked questions

### Is Implen NanoPhotometer free?

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

### Is Mercury free?

Mercury is free to download, with in-app purchases available.

### Do Implen NanoPhotometer or Mercury have ads?

Neither Implen NanoPhotometer nor Mercury shows ads.

### Which is updated more often, Implen NanoPhotometer or Mercury?

Implen NanoPhotometer ships an update every 3 months, and Mercury every 70 months. Most recently, Implen NanoPhotometer was updated on October 9, 2026 and Mercury on October 24, 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.*