Ross Optical Calculator vs Conv3rtify
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ross Optical Calculator
This utility app provides a comprehensive calculator for a variety of optical equations. It is designed for ease of use, making complex calculations accessible on your mobile device.
- Optical equation calculator
- Wide range of equations
- Easy to use interface
- Mobile accessibility
Read full descriptionHide full description
A mobile app calculator with a wide range of optic equations, made easy for you to use.
Conv3rtify
Read full descriptionHide full description
Conv3rtify is a powerful universal unit conversion tool that will make your life easier. In the app you'll find 3 main sections: - Standard, with some basic units (length, area, volume, mass, angle, time, etc.) - Pro, with more advanced and specific ones (colors, currency, base, and temperature conversion systems) - Favorites, where you can save the units you use the most — Pro features are available only with the Conv3rtify+ program. Upgrade to Conv3rtify+ to remove ads & unlock all the powerful capabilities of the app. It's a 1-time paying program: you pay once and you're able to use your app at 100% forever. When our team will come up with new cool features, you'll simply need to enjoy them and you won't be obliged to pay another time. — Conv3rtify also allows users to choose between 2 different themes: light and dark mode. There is even the possibility to select an automatic mode that will change the app's theme based on the device's theme.
Screenshots
Verdict
The clearest difference is in-app purchases: Ross Optical Calculator at none against Conv3rtify's 1. Ross Optical Calculator also leads on update cadence (every 6 weeks vs every 26 months) and iOS requirement (12.4 vs 15.1). On price, ads and device support 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
Both are free to download. Conv3rtify sells 1 one-off in-app purchase. Ross Optical Calculator asks for nothing beyond the download.
Ross Optical Calculator ships an update every 6 weeks, Conv3rtify every 26 months. The most recent releases landed on June 6, 2026 and September 15, 2026 respectively.
| Parameter | Ross Optical Calculator | Conv3rtify |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 6 weeks — better | Every 26 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.4 — better | 15.1 |
| Further details — not scored | ||
| Size | 12 MB | 40 MB |
| Age rating | 4+ | 4+ |
| Developer | Ross Optical | Ilya Emeliyanov |
In-app purchases
Ross Optical Calculator
No in-app purchases
Conv3rtify
- Conv3rtify+$2.99
Questions
Is Ross Optical Calculator free?
Is Conv3rtify free?
Do Ross Optical Calculator or Conv3rtify have ads?
Which is updated more often, Ross Optical Calculator or Conv3rtify?
Other comparisons















