# PoolCalc vs Poolistry

The clearest difference is review sentiment: Poolistry at 100% against PoolCalc's 17%. Poolistry also leads on rating (4.9 vs 1.0) and update cadence (weekly vs every 2 months). PoolCalc's advantage is ads (none vs shown) and iOS requirement (7.1 vs 15.0). On price, in-app purchases, monetization model and device support there is nothing between them.

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

Poolistry holds the better App Store score, 4.9 against 1.0. That said, the two scores are not equally well evidenced: Poolistry has 26 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 17% of PoolCalc's written reviews are positive against 100% of Poolistry's.

PoolCalc ships an update every 2 months, Poolistry weekly. The most recent releases landed on September 30, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | PoolCalc | Poolistry |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/poolcalc/id514707093/reviews) | **[4.9 (26 ratings)](https://appshunter.io/ios/app/poolistry-pool-calculator/id6748267875/reviews)** |
| Number of ratings | 1 | **26** |
| Positive reviews | 16.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 8 MB | 47 MB |
| Requires iOS | **7.1** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Bonham Customs](https://appshunter.io/developer/514707096) | [Yonah Systems](https://appshunter.io/developer/1694042531) |

## What reviewers say

### PoolCalc

[App page](https://appshunter.io/ios/app/poolcalc/id514707093)

This utility calculates the scaling potential of pool water using the Langelier Saturation Index. It allows users to save and edit readings, locations, and add notes. A paid upgrade offers advanced features for pool professionals.

**Highlights:** Langelier Saturation Index calculation, Save and edit readings, Save and edit locations, Add notes to readings, Quick add readings to locations, Paid upgrade for multiple location routes

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pool Professional Upgrade | $2.99 | one-time |


### Poolistry

[App page](https://appshunter.io/ios/app/poolistry-pool-calculator/id6748267875)

This app helps pool owners manage water chemistry and maintenance. It offers smart calculators for chemical adjustments, a comprehensive logging system for tests and tasks, and cloud backup for data synchronization across devices. Keep your pool crystal clear with ease.

**Highlights:** Smart chemical adjustment calculators, Water testing and readings log, Chemical addition tracking, Maintenance task logging, Cloud backup and sync, Expense and notes tracking

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Poolistry - Premium - 1 Month | $1.99 | per month |
| Poolistry - Premium - 1 Year | $9.99 | per year |
| Lifetime Premium Access | $59.99 | one-time |


## Frequently asked questions

### Is PoolCalc free?

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

### Is Poolistry free?

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

### Which has better reviews, PoolCalc or Poolistry?

Poolistry is rated higher. PoolCalc averages 1.0 out of 5 from 1 ratings, while Poolistry averages 4.9 from 26 ratings.

### Do PoolCalc or Poolistry have ads?

Poolistry shows ads; PoolCalc does not.

### Which is updated more often, PoolCalc or Poolistry?

PoolCalc ships an update every 2 months, and Poolistry weekly. Most recently, PoolCalc was updated on September 30, 2026 and Poolistry on October 13, 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.*