# AquaEstima: Aquarium Tools — Tank volume, CO₂, fertilizers

> Tank volume, CO₂, fertilizers (iPhone/iPad app by Arkadiusz Ilkow.)

- Source: https://appshunter.io/ios/app/aquaestima-aquarium-tools/id6472360956 (this page in markdown: same URL + `.md`)
- Developer: [Arkadiusz Ilkow](https://appshunter.io/developer/1715321254)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 57 MB
- Languages: American English, Czech, Danish, Dutch, Finnish, French (France), German (Germany), Greek, Hungarian, Italian and 12 more
- Released: 2023-11-18
- Data updated: 2026-10-24

## What is AquaEstima?

AquaEstima puts 24 precise aquarium calculators in one app. Every result comes with its formula, a worked example and a diagram, so you can check the math yourself.

AQUARIUM
• Volume of rectangular and bow-front tanks (gross and net)
• Substrate amount and number of bags
• T5/T8 and LED lighting (W/L, lm/L) for choosing plants
• Energy use and running costs
• Dosing of medicines, water conditioners and salt baths
• Tank weight and floor load

WATER
• Remineralizing RO water, live bacteria products
• CO₂ from KH, pH and temperature, with the expected drop checker colour
• Mixing tap and RO water, GH and conductivity correction
• TDS ↔ EC, pH scale, hardness unit converter, water change temperature

FERTILIZATION
• Redfield ratio (N:P) with a ready correction dose
• Your own macro fertilizer from salts
• Salt solution strength, iron chelate

TOOLS
• My aquariums: enter the dimensions once and the calculators fill them in
• Test timers for drop tests, with notifications
• Metric and US units, hardness in °dH or ppm, light and dark theme, works offline

PREMIUM (subscription)
• Parameter log: 13 parameters with charts, target ranges, warnings, free ammonia and CO₂, test reminders, sync across devices
• LED fixture designer: wizard and manual LED placement
• No ads, unlimited aquariums

Privacy policy: https://www.privacypolicies.com/live/6889fc27-10b6-463d-a3de-833424e51abb
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| PREMIUM MONTH | $0.99 | per month |
| PREMIUM YEAR | $9.99 | per year |


## Is AquaEstima safe?

Not enough ratings yet to assess AquaEstima.

## Is AquaEstima legit?

AquaEstima: Aquarium Tools appears to be a legitimate app. The AppsHunter Legitimacy Score for AquaEstima is 85 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 3.0.0 — 2026-10-23

New version: refreshed design, 24 calculators, CO₂ with water temperature, a parameter log with charts, an LED fixture designer and 23 languages.

### 2.0.1 — 2026-03-06

- Test timer adjustments
- Added 2 new mineralizers

### 2.0.0 — 2025-09-25

- Test timer added
- Visual updates

### 1.3.0 — 2024-04-04

Aqua Estima v. 1.3.0
Premium version:
- Parameter log.

### 1.2.0 — 2024-02-16

Visual changes.

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## More apps by Arkadiusz Ilkow

- [TODO! Simple List](https://appshunter.io/ios/app/todo-simple-list/id6471425810)
- [Pupilek. Świnka morska, Królik](https://appshunter.io/ios/app/pupilek-swinka-morska-krolik/id6472603206)
- [FitEat Pro: Glycemic Index](https://appshunter.io/ios/app/fiteat-pro-glycemic-index/id6472609668)
- [Herbarium. The World of Herbs](https://appshunter.io/ios/app/herbarium-the-world-of-herbs/id6479599718)
- [VroomCar](https://appshunter.io/ios/app/vroomcar/id6497223364)

All apps by Arkadiusz Ilkow: https://appshunter.io/developer/1715321254

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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 2026-10-24.*