Molecular Weight Calculator vs Ring Sizer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Molecular Weight Calculator
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.
- 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
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The Molecular Weight Calculator is a physics/math tool designed to find the average molecular weight (MW) of molecules by inputting their chemical formulas. Features: - Instant calculation - Results can be copied to other apps - Includes formula references - Supports up to 16 decimal places - Works seamlessly on both iPhone and iPad. - Lightweight, compact app optimized for everyday use. - Ad-free and built with privacy in mind. Note: Chemical formulas are case-sensitive (e.g., C22H30N4O). Definitions: - Molecular mass (molecular weight): The mass of one molecule of a substance, expressed in unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12) - Molar mass (molar weight): The mass of one mole of a substance, expressed in grams per mole (g/mol). Thank you for your support! Visit nitrio.com for more apps for your iOS devices.
Ring Sizer
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.
- Measure with finger
- Measure with existing ring
- Multiple size systems
- Screen-calibrated accuracy
- Save and compare measurements
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Find your ring size in seconds — no trip to the jeweler needed. MEASURE WITH YOUR FINGER Place your finger on the screen and adjust the guide to estimate your size. Great when you don't have a ring to compare. MEASURE WITH A RING Place a ring you already own on the screen and match the circle to the inside edge. The most accurate way to find your size at home. EVERY SIZE SYSTEM YOU NEED See your result in US/CA, UK, JP, diameter (mm & inch), and circumference (mm) — all at once, no switching. SCREEN-CALIBRATED ACCURACY Auto-detects your iPhone model for precise on-screen measurements. SAVE & COMPARE Label and save measurements for yourself, a partner, or family. Come back anytime to check. Free. No ads. No account required.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Molecular Weight Calculator | Ring Sizer |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (3 ratings) — better | 4.9 (9 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 3 | 9 — better |
| Update frequency | Every 29 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 13 — better | 17.0 |
| Further details — not scored | ||
| Size | 1 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Nitrio | 100 Factories |
Customer experience
Molecular Weight Calculator
Ring Sizer
In-app purchases
Molecular Weight Calculator
No in-app purchases
Ring Sizer
No in-app purchases
Questions
Is Molecular Weight Calculator free?
Is Ring Sizer free?
Which has better reviews, Molecular Weight Calculator or Ring Sizer?
Do Molecular Weight Calculator or Ring Sizer have ads?
Which is updated more often, Molecular Weight Calculator or Ring Sizer?
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