# Orenda vs LSI Calculator

The clearest difference is ratings volume: Orenda at 478 against LSI Calculator's 5. Orenda also leads on rating (4.7 vs 4.4). LSI Calculator's advantage is review sentiment (100% vs 82%) and iOS requirement (11.0 vs 15.0). On price, update cadence, ads and in-app purchases there is nothing between them.

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

Orenda holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Orenda has 478 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 82% of Orenda's written reviews are positive against 100% of LSI Calculator's, so the app with the better star average is not the one people write more warmly about.

Orenda ships an update monthly, LSI Calculator every 2 months. Both last shipped on November 2, 2026.

## The numbers

| Metric | Orenda | LSI Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (478 ratings)](https://appshunter.io/ios/app/orenda/id1171005221/reviews)** | [4.4 (5 ratings)](https://appshunter.io/ios/app/lsi-calculator/id1233049990/reviews) |
| Number of ratings | **478** | 5 |
| Positive reviews | 81.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free | Free |
| Size | 78 MB | 52 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Hasa Inc.](https://appshunter.io/developer/1713193810) | [Pure Planet Science & Technology, Inc.](https://appshunter.io/developer/1234693265) |

## What reviewers say

### Orenda

[App page](https://appshunter.io/ios/app/orenda/id1171005221)

This app helps you master pool chemistry by accurately calculating chemical dosages and balancing water based on the LSI. It offers a user-friendly experience for both novices and professionals, including a volume estimator and educational videos.

**Highlights:** Chemical dosing calculator, LSI water balancing, Pool volume estimator, User-friendly interface, Educational videos

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Easy to use
- 💡 Helpful for pool maintenance
- 🚀 Simplifies pool chemistry
- 👍 Provides valuable information
- 👍 Great educational resources

**What reviewers complain about**

- 🐛 Issues with updating desired levels
- 🐛 Metric system not working properly
- 🐛 Difficult to input readings
- 🐛 Lack of history/logging functionality

**Reported bugs**

- Desired levels changing when inputting current values
- Metric system not functioning as expected
- Slider feature for inputting readings is slow and frustrating
- App not optimized for all iPhone screen sizes

**Requested features**

- Ability to save pool volume and desired levels
- Option to log pool history and track trends
- Integration with pool chemical monitors
- Ability to set custom chemical concentrations
- Support for more languages (e.g., Chinese)


### LSI Calculator

[App page](https://appshunter.io/ios/app/lsi-calculator/id1233049990)

This app provides tools and educational resources to help users manage water systems, focusing on eco-friendly treatments for pools and spas. It aims to make water maintenance accessible to everyone, regardless of their experience level.

**Highlights:** Water science education, Pool and spa water management, Eco-friendly treatment guidance, NSF/ANSI Certified product information, Tools for water system management

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Orenda free?

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

### Is LSI Calculator free?

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

### Which has better reviews, Orenda or LSI Calculator?

Orenda is rated higher. Orenda averages 4.7 out of 5 from 478 ratings, while LSI Calculator averages 4.4 from 5 ratings.

### Do Orenda or LSI Calculator have ads?

Neither Orenda nor LSI Calculator shows ads.

### Which is updated more often, Orenda or LSI Calculator?

Orenda ships an update monthly, and LSI Calculator every 2 months. Most recently, Orenda was updated on November 2, 2026 and LSI Calculator on November 2, 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.*