# Oovium vs Green Map Surveys

The clearest difference is update cadence: Oovium at monthly against Green Map Surveys's every 17 months. Green Map Surveys's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Oovium ships an update monthly, Green Map Surveys every 17 months. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Oovium | Green Map Surveys |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/oovium/id336573328/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 64.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 17 months |
| Monetization | Free | — |
| Size | 11 MB | 50 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aepryus Software](https://appshunter.io/developer/336573331) | [GISCollective](https://appshunter.io/developer/1587762271) |

## 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


### Green Map Surveys

[App page](https://appshunter.io/ios/app/green-map-surveys/id6743010766)

**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 Green Map Surveys free?

Green Map Surveys is free to download, with no in-app purchases.

### Do Oovium or Green Map Surveys have ads?

Neither Oovium nor Green Map Surveys shows ads.

### Which is updated more often, Oovium or Green Map Surveys?

Oovium ships an update monthly, and Green Map Surveys every 17 months. Most recently, Oovium was updated on October 29, 2026 and Green Map Surveys on October 25, 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.*