# Oovium vs FieldStack

Oovium and FieldStack both sit at 5.0 stars, but that hides the real split: 100% of FieldStack's written reviews are positive against 65% of Oovium's. FieldStack also leads on update cadence (every 8 days vs every 6 weeks). Oovium's advantage is ratings volume (5 vs 1) and iOS requirement (17.0 vs 26.0). On price, rating, 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.

On the App Store both sit at effectively the same score — 5.0 for Oovium against 5.0 for FieldStack. That said, the two scores are not equally well evidenced: Oovium has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 65% of Oovium's written reviews are positive against 100% of FieldStack's.

Oovium ships an update every 6 weeks, FieldStack every 8 days. The most recent releases landed on October 17, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Oovium | FieldStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/oovium/id336573328/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/fieldstack/id6792173715/reviews) |
| Number of ratings | **5** | 1 |
| Positive reviews | 64.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 8 days** |
| Monetization | Free | Free |
| Size | 10 MB | 18 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Aepryus Software](https://appshunter.io/developer/336573331) | [Dylan Russell](https://appshunter.io/developer/1869725372) |

## What reviewers say

### Oovium

[App page](https://appshunter.io/ios/app/oovium/id336573328)

This app is a novel calculation sandbox that combines the functionality of calculators, spreadsheets, concept maps, and programming languages into a single, visually intuitive interface. It aims to make complex computing abilities accessible to a wider audience through explicit visual representations.

**Highlights:** Calculation sandbox, Visual programming interface, Spreadsheet functionality (GridBub), Concept mapping (TextBub), Custom function definition (MechBub), Object instances (InstBub)

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 💡 Innovative concept
- 💡 Creative approach to calculations
- 💡 Visualizing problems and solutions
- 💡 Useful for prototyping and debugging
- 💡 Good for "what-if" analysis

**What reviewers complain about**

- 🐛 Poor documentation
- 🐛 Trial and error learning curve
- 🐛 Mac version unclear
- 🐛 Subscription too expensive
- 🐛 Apple-exclusive

**Reported bugs**

- Subscription not working
- Crashes on launch on iPad
- Links to Dropbox no longer work
- Update killed everything, crashes on first screen
- Crashes regularly

**Requested features**

- Better terminology
- Vastly better documentation
- Pay-once option
- Lower purchase price ($3.99 or less)
- Graphing and graphics capabilities


### FieldStack

[App page](https://appshunter.io/ios/app/fieldstack/id6792173715)

This app provides an offline workspace for construction plans, allowing users to import PDFs, search every page for specific information, and create custom boards of relevant sheets. It enables on-page markup, field status recording, and note-taking, all accessible without an internet connection.

**Highlights:** Offline PDF plan import, Full-page search, Customizable sheet boards, On-page markup tools, Field status tracking, Notebooks for notes and photos, Siri and widget integration

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

**In-app purchases:** none


## Frequently asked questions

### Is Oovium free?

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

### Is FieldStack free?

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

### Which has better reviews, Oovium or FieldStack?

Oovium and FieldStack are both rated 5.0 out of 5 on the App Store, from 5 and 1 ratings respectively.

### Do Oovium or FieldStack have ads?

Neither Oovium nor FieldStack shows ads.

### Which is updated more often, Oovium or FieldStack?

Oovium ships an update every 6 weeks, and FieldStack every 8 days. Most recently, Oovium was updated on October 17, 2026 and FieldStack on October 20, 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.*