# Ross Optical Calculator vs Conv3rtify

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.

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.

## The numbers

| Metric | Ross Optical Calculator | Conv3rtify |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/ross-optical-calculator/id1377878551/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 26 months |
| Monetization | Free | — |
| Size | 12 MB | 40 MB |
| Requires iOS | **12.4** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ross Optical](https://appshunter.io/developer/1377878550) | [Ilya Emeliyanov](https://appshunter.io/developer/1602343908) |

## What reviewers say

### Ross Optical Calculator

[App page](https://appshunter.io/ios/app/ross-optical-calculator/id1377878551)

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.

**Highlights:** Optical equation calculator, Wide range of equations, Easy to use interface, Mobile accessibility

**Features:** macOS Compatibility

**In-app purchases:** none


### Conv3rtify

[App page](https://appshunter.io/ios/app/conv3rtify/id1602343906)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Conv3rtify+ | $2.99 | one-time |


## Frequently asked questions

### Is Ross Optical Calculator free?

Ross Optical Calculator is free to download, with no in-app purchases.

### Is Conv3rtify free?

Conv3rtify is free to download, with in-app purchases available.

### Do Ross Optical Calculator or Conv3rtify have ads?

Neither Ross Optical Calculator nor Conv3rtify shows ads.

### Which is updated more often, Ross Optical Calculator or Conv3rtify?

Ross Optical Calculator ships an update every 6 weeks, and Conv3rtify every 26 months. Most recently, Ross Optical Calculator was updated on June 6, 2026 and Conv3rtify on September 15, 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.*