# SolverPad vs Sigma Notepad Calculator

The clearest difference is ads: Sigma Notepad Calculator at none against SolverPad's shown. SolverPad's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, update cadence and in-app purchases there is nothing between them.

Both are free to download. SolverPad sells 1 one-off in-app purchase and Sigma Notepad Calculator sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

SolverPad ships an update weekly, Sigma Notepad Calculator fortnightly. The most recent releases landed on November 8, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | SolverPad | Sigma Notepad Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Fortnightly |
| Size | 35 MB | 19 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [ASAPP STUDIO](https://appshunter.io/developer/1338092352) | [Soules Studio Ltd](https://appshunter.io/developer/1883253392) |

## 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 |


### Sigma Notepad Calculator

[App page](https://appshunter.io/ios/app/sigma-notepad-calculator/id6768903761)

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Annual | $14.99 | per year |
| Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is SolverPad free?

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

### Is Sigma Notepad Calculator free?

Sigma Notepad Calculator is free to download, with in-app purchases available.

### Do SolverPad or Sigma Notepad Calculator have ads?

SolverPad shows ads; Sigma Notepad Calculator does not.

### Which is updated more often, SolverPad or Sigma Notepad Calculator?

SolverPad ships an update weekly, and Sigma Notepad Calculator fortnightly. Most recently, SolverPad was updated on November 8, 2026 and Sigma Notepad Calculator on November 9, 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.*