# Percival vs E6B Flight Computer Calc

The clearest difference is in-app purchases: Percival at none against E6B Flight Computer Calc's 1. E6B Flight Computer Calc's advantage is update cadence (every 4 weeks vs every 8 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. E6B Flight Computer Calc sells 1 one-off in-app purchase. Percival asks for nothing beyond the download.

Percival ships an update every 8 months, E6B Flight Computer Calc every 4 weeks. The most recent releases landed on September 29, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Percival | E6B Flight Computer Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 weeks** |
| Size | 27 MB | 7 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [SIMON DAVID ROBINSON](https://appshunter.io/developer/1769606336) | [Grima Hdez](https://appshunter.io/developer/1741481582) |

## What reviewers say

### Percival

[App page](https://appshunter.io/ios/app/percival/id6702021936)

**In-app purchases:** none


### E6B Flight Computer Calc

[App page](https://appshunter.io/ios/app/e6b-flight-computer-calc/id6799915139)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| E6B Pro | $5.99 | one-time |


## Frequently asked questions

### Is Percival free?

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

### Is E6B Flight Computer Calc free?

E6B Flight Computer Calc is free to download, with in-app purchases available.

### Do Percival or E6B Flight Computer Calc have ads?

Neither Percival nor E6B Flight Computer Calc shows ads.

### Which is updated more often, Percival or E6B Flight Computer Calc?

Percival ships an update every 8 months, and E6B Flight Computer Calc every 4 weeks. Most recently, Percival was updated on September 29, 2026 and E6B Flight Computer Calc on October 15, 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.*