# SolverPad vs Calto

The clearest difference is in-app purchases: Calto at none against SolverPad's 1. Calto also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. SolverPad sells 1 one-off in-app purchase. Calto asks for nothing beyond the download.

SolverPad ships an update weekly, Calto every 9 days. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | SolverPad | Calto |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 9 days |
| Size | 34 MB | 30 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [ASAPP STUDIO](https://appshunter.io/developer/1338092352) | [JONGWOO PARK](https://appshunter.io/developer/1873952653) |

## What reviewers say

### SolverPad

[App page](https://appshunter.io/ios/app/solverpad-notepad-calculator/id6754253396)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Version | $0.99 | one-time |


### Calto

[App page](https://appshunter.io/ios/app/calto-note-calculator/id6758614596)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SolverPad free?

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

### Is Calto free?

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

### Do SolverPad or Calto have ads?

SolverPad shows ads; Calto does not.

### Which is updated more often, SolverPad or Calto?

SolverPad ships an update weekly, and Calto every 9 days. Most recently, SolverPad was updated on October 7, 2026 and Calto on October 12, 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.*