# Orenda — Pool Calculator and Education

> Swimming pool chemical dosing calculator and water chemistry balancer. (iPhone/iPad app by Hasa Inc..)

- Source: https://appshunter.io/ios/app/orenda/id1171005221 (this page in markdown: same URL + `.md`)
- Developer: [Hasa Inc.](https://appshunter.io/developer/1713193810)
- Category: Productivity, Reference
- Price: Free
- Rating: 4.70/5 from 473 App Store ratings · 86 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 81 MB
- Languages: American English
- Released: 2016-12-09
- Data updated: 2026-08-20
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/orenda/id1171005221/reviews.md

## What is Orenda?

Master pool chemistry with the Orenda pool chemical dosing calculator. Measure pool chemicals accurately while balancing water chemistry according to the LSI. The Orenda App is a swimming pool calculator with a user friendly experience, and makes pool chemistry easier than ever. Try the new pool volume estimator and watch Orenda videos in the app. A pool chemical calculator that allows a novice to dose chemicals as accurately as a professional pool operator.

## Key features

- Chemical dosing calculator
- LSI water balancing
- Pool volume estimator
- User-friendly interface
- Educational videos

## What do users think of Orenda?

Overall sentiment: positive

**Pros**

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

**Cons**

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

**Commonly 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

**Most 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)

## Recent user reviews (10 of 86)

All indexed reviews: https://appshunter.io/ios/app/orenda/id1171005221/reviews.md

### 4/5 — Game changer!

*2026-06-30*

The title says it all. I maintain my own pool, and despite the salt cell and muriatic acid pump automation, if you don’t know or understand your water quality numbers of how the system actually works things can quickly take a turn for the worse. This app makes it SO EASY to dial in my numbers and maintain a healthy LSI. No more laser focus on maintaining a PH of 7.2 - 7.6, and no more lack of understanding TA and ORP and how the salt cell works. Thanks to this app and the great blogs on the Orenda website, I’m now a master of my pool and not a slave to it. The only reason it doesn’t get five stars is that it doesn’t have a historic function. Being able to save all of my test readings by date so I can go back and refer to the historical data would make the app perfect. Orenda, please add this functionality! :-)

### 4/5 — Orenda is great!

*2026-05-26*

I live Orenda, but there are a few things I would change. First, I would add in a calculation for how to adjust a pool with too much chlorine by adding sodium Thiosulfate. This is a needed calculation. Also, I would list IN ORDER what chemicals to put in and how to apply them. At no time should Soda Ash be applied prior to Sodium Bicarbonate, however Soda Ash appears first in some cases, which also affects pH… there should be a “how to” section that explains how to put the chemicals in for newer pool cleaners.

### 5/5 — Homeowner

*2026-04-16, version 6.1.0*

Very simple to use for a novice pool owner

### 5/5 — Good tool to have

*2026-02-13, version 6.0.8*

Makes pool care simple and keeps system working longer

### 5/5 — The best pool app, period.

*2026-01-09*

Absolutely the best app to manage your pool the right way, and supported by great educational material on the Orenda web site and if you want, a great selection of chemicals that are mentioned but not really pushed.

To bad one cannot keep a
history in it. I use the PoolMath app for that, which is otherwise not-too-distant but second to the Orenda app.

### 1/5 — Malfunctioning

*2025-10-04*

Every time I update my current numbers, it updates the desired to reflect the same if they aren’t locked. If the desired are locked, it won’t update my current. It will slow me to input my new current figures when the desired is locked, but immediately reverts to what they were previously. If I then close the app and relaunch it, then my recently input current numbers will be updated. It makes no sense and is frustrating.

### 5/5 — Une merveille!

*2025-04-11, version 6.0.1*

Le meilleur accompagnement dans de l’équilibre de l’eau. Facile, ludique et bien adapté pour l’Europe avec m3, littes et celcius. 
Vous pouvez y aller les yeux fermés. Jamais ma piscine a été aussi belle depuis j’arrête de suivre bêtement les consignes- souvent faux- des vendeurs de la chimie et de basculer sur l’équilibre de l’eau.

### 1/5 — No chlorine or acid recommendations

*2024-12-18, version 5.1.3*

No matter what I change in the app, it never recommends adding or removing chlorine or acid. It seems broke.

### 5/5 — Great intuitive app

*2024-12-09*

Love everything about the app and how easy it is to calculate pool chemicals. I just wish it had logging as well so we can track and have history of what was added. Please add this feature.

### 5/5 — Awesome App!

*2024-10-24, version 5.1.3*

Awesome app that helps greatly with the maintenance of my pool.  Love the Tule your Pool Podcast and Eric and crew spending the time to teach all the info. 

Thank you! 

Wish you had an official Amazon store so I as a home owner am getting authentic products when I order your stuff.

## Frequently asked questions about Orenda

### What does the Orenda app do?

The Orenda app is a swimming pool calculator designed to help users master pool chemistry. It accurately calculates chemical dosages and balances water according to the LSI, making pool chemistry easier for both novices and professionals.

### What are the key features of Orenda?

Key features include a chemical dosing calculator, LSI water balancing, a pool volume estimator, a user-friendly interface, and access to educational videos within the app.

### Is Orenda free to use?

Yes, the Orenda app is free to use. It does not have in-app purchases or advertisements.

### Who is the Orenda app for?

This app is ideal for anyone who owns or maintains a swimming pool, including novice pool owners and professional pool operators, who want to ensure accurate chemical dosing and balanced water chemistry.

## Version history (last 5 releases)

### 6.1.2 — 2026-08-17

Minor adjustments

### 6.1.1 — 2026-05-13

Improve Crystal
Added Skedit as a software partner

### 6.1.0 — 2026-04-14

WCAG compliance

### 6.0.9 — 2026-04-01

Updated links

### 6.0.8 — 2026-01-21

Fixed several issues

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## More apps by Hasa Inc.

- [Pool Acid Dose Calc](https://appshunter.io/ios/app/pool-acid-dose-calc/id711282054)
- [Pool Chemical Dose Calculator](https://appshunter.io/ios/app/pool-chemical-dose-calculator/id1148385163)
- [pH-Alkalinity Adjustment Tool](https://appshunter.io/ios/app/ph-alkalinity-adjustment-tool/id1527031215)
- [HASA water](https://appshunter.io/ios/app/hasa-water/id6473078202)
- [Hasa Pro Rewards](https://appshunter.io/ios/app/hasa-pro-rewards/id6751251252)

All apps by Hasa Inc.: https://appshunter.io/developer/1713193810

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-20.*