# TENS vs Pool Salt Calculator

The clearest difference is update cadence: Pool Salt Calculator at every 2 weeks against TENS's every 71 months. TENS's advantage is iOS requirement (12.0 vs 17.5). 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.

TENS ships an update every 71 months, Pool Salt Calculator every 2 weeks. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | TENS | Pool Salt Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 71 months | **Every 2 weeks** |
| Size | 2 MB | 25 MB |
| Requires iOS | **12.0** | 17.5 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Shenzhen Chileaf Electronics Co.,LTD](https://appshunter.io/developer/1460339012) | [Norbert Makk](https://appshunter.io/developer/1720445642) |

## What reviewers say

### TENS

[App page](https://appshunter.io/ios/app/tens/id1491308284)

**In-app purchases:** none


### Pool Salt Calculator

[App page](https://appshunter.io/ios/app/pool-salt-calculator/id6670433963)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is TENS free?

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

### Is Pool Salt Calculator free?

Pool Salt Calculator is free to download, with no in-app purchases.

### Do TENS or Pool Salt Calculator have ads?

Neither TENS nor Pool Salt Calculator shows ads.

### Which is updated more often, TENS or Pool Salt Calculator?

TENS ships an update every 71 months, and Pool Salt Calculator every 2 weeks. Most recently, TENS was updated on November 3, 2026 and Pool Salt Calculator on October 27, 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.*