Comparison

Molecular Weight Calculator vs Ring Sizer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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.

About

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.

Highlights
  • Measure with finger
  • Measure with existing ring
  • Multiple size systems
  • Screen-calibrated accuracy
  • Save and compare measurements
Features
Read full description

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

Molecular Weight Calculator4 screens
Ring Sizer4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
Molecular Weight Calculator versus Ring Sizer: the parameters behind the verdict, then further details
ParameterMolecular Weight CalculatorRing Sizer
Price$2.99Free — better
Rating5.0 (3 ratings) — better4.9 (9 ratings)
Positive reviews—100.0% of reviews
Number of ratings39 — better
Update frequencyEvery 29 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13 — better17.0
Further details — not scored
Size1 MB4 MB
Age rating4+4+
DeveloperNitrio100 Factories

Customer experience

Molecular Weight Calculator

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Ring Sizer

All ratings8 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Molecular Weight Calculator

No in-app purchases

None

Ring Sizer

No in-app purchases

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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