# Molecular Weight Calculator vs Ring Sizer

The clearest difference is price: Ring Sizer at Free against Molecular Weight Calculator's $2.99. Ring Sizer also leads on update cadence (every 3 months vs every 29 months) and ratings volume (9 vs 3). Molecular Weight Calculator's advantage is device support (3 vs 1) and iOS requirement (13 vs 17.0). On rating, ads and in-app purchases there is nothing between them.

Ring Sizer is free to download; Molecular Weight Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Molecular Weight Calculator against 4.9 for Ring Sizer. Both are backed by a comparable volume of ratings — 3 and 9 respectively.

Molecular Weight Calculator ships an update every 29 months, Ring Sizer every 3 months. The most recent releases landed on October 15, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Molecular Weight Calculator | Ring Sizer |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/molecular-weight-calculator/id1444836038/reviews)** | [4.9 (9 ratings)](https://appshunter.io/ios/app/ring-sizer-ring-size-finder/id6760617077/reviews) |
| Number of ratings | 3 | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 4 MB |
| Requires iOS | **13** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [100 Factories](https://appshunter.io/developer/1559484344) |

## What reviewers say

### Molecular Weight Calculator

[App page](https://appshunter.io/ios/app/molecular-weight-calculator/id1444836038)

This tool calculates the average molecular weight of molecules using their chemical formulas. It offers instant results, supports high precision, and is optimized for everyday use on iOS devices. The app prioritizes user privacy and is ad-free.

**Highlights:** Instant molecular weight calculation, Copy results to other apps, Includes formula references, Supports up to 16 decimal places, Works on iPhone and iPad, Ad-free and privacy-focused

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

**In-app purchases:** none


### Ring Sizer

[App page](https://appshunter.io/ios/app/ring-sizer-ring-size-finder/id6760617077)

Easily determine your ring size at home using your finger or an existing ring. Get results in multiple international sizing systems instantly. Save your measurements for future reference.

**Highlights:** Measure with finger, Measure with existing ring, Multiple size systems, Screen-calibrated accuracy, Save and compare measurements

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

**In-app purchases:** none


## Frequently asked questions

### Is Molecular Weight Calculator free?

Molecular Weight Calculator costs $2.99, with no in-app purchases.

### Is Ring Sizer free?

Ring Sizer is free to download, with no in-app purchases.

### Which has better reviews, Molecular Weight Calculator or Ring Sizer?

Molecular Weight Calculator is rated higher. Molecular Weight Calculator averages 5.0 out of 5 from 3 ratings, while Ring Sizer averages 4.9 from 9 ratings.

### Do Molecular Weight Calculator or Ring Sizer have ads?

Neither Molecular Weight Calculator nor Ring Sizer shows ads.

### Which is updated more often, Molecular Weight Calculator or Ring Sizer?

Molecular Weight Calculator ships an update every 29 months, and Ring Sizer every 3 months. Most recently, Molecular Weight Calculator was updated on October 15, 2026 and Ring Sizer 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.*