# FPN Introduction Days vs Inferra Logic Sequences

The clearest difference is in-app purchases: FPN Introduction Days at none against Inferra Logic Sequences's 3. FPN Introduction Days also leads on ads (none vs shown) and iOS requirement (11.0 vs 15.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Inferra Logic Sequences sells 3 in-app purchases, starting at $2.99 per month. FPN Introduction Days asks for nothing beyond the download.

FPN Introduction Days ships an update every 9 days, Inferra Logic Sequences weekly. The most recent releases landed on October 26, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | FPN Introduction Days | Inferra Logic Sequences |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 days | **Weekly** |
| Size | 27 MB | 48 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Maastricht University](https://appshunter.io/developer/1200783829) | [Julien meyer](https://appshunter.io/developer/285361686) |

## What reviewers say

### FPN Introduction Days

[App page](https://appshunter.io/ios/app/fpn-introduction-days/id1469036439)

**Features:** macOS Compatibility

**In-app purchases:** none


### Inferra Logic Sequences

[App page](https://appshunter.io/ios/app/inferra-logic-sequences/id6757953254)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| premium | $2.99 | per month |
| premium | $19.99 | per year |
| premium | $49.99 | one-time |


## Frequently asked questions

### Is FPN Introduction Days free?

FPN Introduction Days is free to download, with no in-app purchases.

### Is Inferra Logic Sequences free?

Inferra Logic Sequences is free to download, with in-app purchases available.

### Do FPN Introduction Days or Inferra Logic Sequences have ads?

Inferra Logic Sequences shows ads; FPN Introduction Days does not.

### Which is updated more often, FPN Introduction Days or Inferra Logic Sequences?

FPN Introduction Days ships an update every 9 days, and Inferra Logic Sequences weekly. Most recently, FPN Introduction Days was updated on October 26, 2026 and Inferra Logic Sequences on October 19, 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.*