# Solve calculation by cellphone vs VPO

The clearest difference is in-app purchases: VPO at none against Solve calculation by cellphone's 1. VPO also leads on ads (none vs shown). Solve calculation by cellphone's advantage is iOS requirement (12.0 vs 15.1). On price, update cadence and device support there is nothing between them.

Both are free to download. Solve calculation by cellphone sells 1 in-app purchase, starting at $1.99 per month. VPO asks for nothing beyond the download.

Solve calculation by cellphone ships an update every 5 days, VPO every 3 days. The most recent releases landed on October 8, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Solve calculation by cellphone | VPO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 days | **Every 3 days** |
| Size | 53 MB | 31 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MUTSUMI SUZUKI](https://appshunter.io/developer/1612946812) | [Digital Knowledge Co.,Ltd.](https://appshunter.io/developer/809208459) |

## What reviewers say

### Solve calculation by cellphone

[App page](https://appshunter.io/ios/app/solve-calculation-by-cellphone/id6450938144)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited number of problems | $1.99 | per month |


### VPO

[App page](https://appshunter.io/ios/app/vpo/id6789568464)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Solve calculation by cellphone free?

Solve calculation by cellphone is free to download, with in-app purchases available.

### Is VPO free?

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

### Do Solve calculation by cellphone or VPO have ads?

Solve calculation by cellphone shows ads; VPO does not.

### Which is updated more often, Solve calculation by cellphone or VPO?

Solve calculation by cellphone ships an update every 5 days, and VPO every 3 days. Most recently, Solve calculation by cellphone was updated on October 8, 2026 and VPO on October 21, 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.*