# SoloPDF vs Calcium Text Calculator

The clearest difference is update cadence: Calcium Text Calculator at every 3 days against SoloPDF's every 2 weeks. SoloPDF's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SoloPDF ships an update every 2 weeks, Calcium Text Calculator every 3 days. The most recent releases landed on October 10, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | SoloPDF | Calcium Text Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Size | 16 MB | 3 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [向东 李](https://appshunter.io/developer/1885418034) | [Twarge LLC](https://appshunter.io/developer/6781456673) |

## What reviewers say

### SoloPDF

[App page](https://appshunter.io/ios/app/solopdf/id6787712953)

**Features:** Vision Pro support

**In-app purchases:** none


### Calcium Text Calculator

[App page](https://appshunter.io/ios/app/calcium-text-calculator/id6795935652)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SoloPDF free?

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

### Is Calcium Text Calculator free?

Calcium Text Calculator is free to download, with no in-app purchases.

### Do SoloPDF or Calcium Text Calculator have ads?

Neither SoloPDF nor Calcium Text Calculator shows ads.

### Which is updated more often, SoloPDF or Calcium Text Calculator?

SoloPDF ships an update every 2 weeks, and Calcium Text Calculator every 3 days. Most recently, SoloPDF was updated on October 10, 2026 and Calcium Text Calculator on October 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.*