# Electronic Formulator vs Aquarium Log

The clearest difference is ads: Electronic Formulator at none against Aquarium Log's shown. Aquarium Log's advantage is iOS requirement (16.6 vs 26.2). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Electronic Formulator sells 1 one-off in-app purchase and Aquarium Log sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 9 days. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Electronic Formulator | Aquarium Log |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (262 ratings)](https://appshunter.io/ios/app/aquarium-log-tank-manager/id1621042664/reviews)** |
| Number of ratings | — | **262** |
| Positive reviews | — | 94.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 days | Every 9 days |
| Monetization | — | Free with in-app purchases |
| Size | 19 MB | 78 MB |
| Requires iOS | 26.2 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Ko Hyunshik](https://appshunter.io/developer/1420039143) |

## What reviewers say

### Electronic Formulator

[App page](https://appshunter.io/ios/app/electronic-formulator/id675036997)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Electronic Pro | $2.99 | one-time |


### Aquarium Log

[App page](https://appshunter.io/ios/app/aquarium-log-tank-manager/id1621042664)

This app helps aquarists of all levels manage and monitor their tanks. It offers features to organize notes, track water parameters with detailed graphs, and manage photos of aquatic life. Stay on top of your aquarium's health and history with this intuitive journaling tool.

**Highlights:** Calendar view for notes and tasks, Unlimited aquarium management, Record and export water parameters, Multiple timers for precision tests, Activity feed for tracking tasks, Detailed graphs for parameter analysis, Photo gallery with custom tags, Cloud backup and restore

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Aquarium Log Premium (Monthly) | $3.99 | per month |
| Aquarium Log Premium (Yearly) | $29.99 | per year |
| Remove Ads | $9.99 | one-time |

**What reviewers like**

- 👍 Helpful for tracking tank parameters and maintenance
- 🚀 Customizable and flexible
- 💡 Integrated community and Q&A
- 🗓️ Useful reminders and scheduling
- 📊 Helpful graphs and data visualization

**What reviewers complain about**

- 🐛 Occasional bugs and issues with data saving
- 📢 Ads can be intrusive
- 🤔 Unintuitive user interface in some areas
- 🔍 Limited database of fish, plants, and invertebrates

**Reported bugs**

- Backspace issue when entering measurements
- Inability to access settings after tapping Subscriptions menu
- Temperature unit not remembered during setup

**Requested features**

- Add ability to track fish age and lifespan
- Improve task scheduling and history view
- Allow more customization of parameter graphs
- Expand database of aquatic species


## Frequently asked questions

### Is Electronic Formulator free?

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

### Is Aquarium Log free?

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

### Do Electronic Formulator or Aquarium Log have ads?

Aquarium Log shows ads; Electronic Formulator does not.

### Which is updated more often, Electronic Formulator or Aquarium Log?

Electronic Formulator ships an update every 9 days, and Aquarium Log every 9 days. Most recently, Electronic Formulator was updated on November 1, 2026 and Aquarium Log on November 3, 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.*