# GrandO' vs Octave Projet Voltaire

GrandO' and Octave Projet Voltaire are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 25, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | GrandO' | Octave Projet Voltaire |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 33 MB | 44 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Polymnia](https://appshunter.io/developer/1531927595) | [Woonoz SAS](https://appshunter.io/developer/441061315) |

## What reviewers say

### GrandO'

[App page](https://appshunter.io/ios/app/grando/id1531927592)

**Features:** Vision Pro support

**In-app purchases:** none


### Octave Projet Voltaire

[App page](https://appshunter.io/ios/app/octave-projet-voltaire/id6499595366)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is GrandO' free?

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

### Is Octave Projet Voltaire free?

Octave Projet Voltaire is free to download, with no in-app purchases.

### Do GrandO' or Octave Projet Voltaire have ads?

Neither GrandO' nor Octave Projet Voltaire shows ads.

### Which is updated more often, GrandO' or Octave Projet Voltaire?

GrandO' ships an update every 2 months, and Octave Projet Voltaire every 2 months. Most recently, GrandO' was updated on October 25, 2026 and Octave Projet Voltaire on September 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*