# Interpolation 1.4 vs Wader Pilot Logbook

The clearest difference is review sentiment: Wader Pilot Logbook at 98% against Interpolation 1.4's 33%. Wader Pilot Logbook also leads on rating (4.6 vs 3.5) and ratings volume (22 vs 6). Interpolation 1.4's advantage is in-app purchases (none vs 1) and iOS requirement (9.0 vs 16.0). On price, update cadence, ads and monetization model there is nothing between them.

Both are free to download. Wader Pilot Logbook sells 1 in-app purchase, starting at $79.99 per year. Interpolation 1.4 asks for nothing beyond the download.

Wader Pilot Logbook holds the better App Store score, 4.6 against 3.5. Both are backed by a comparable volume of ratings — 6 and 22 respectively. Written reviews point the same way: 33% of Interpolation 1.4's written reviews are positive against 98% of Wader Pilot Logbook's.

Interpolation 1.4 ships an update every 3 weeks, Wader Pilot Logbook every 2 weeks. The most recent releases landed on October 4, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Interpolation 1.4 | Wader Pilot Logbook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (6 ratings)](https://appshunter.io/ios/app/interpolation-14/id557950545/reviews) | **[4.6 (22 ratings)](https://appshunter.io/ios/app/wader-pilot-logbook/id1582209980/reviews)** |
| Number of ratings | 6 | **22** |
| Positive reviews | 33.3% of reviews | **98.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 1 MB | 94 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ZOFTERM](https://appshunter.io/developer/557950548) | [Wader Aviation Corp](https://appshunter.io/developer/1582209982) |

## What reviewers say

### Interpolation 1.4

[App page](https://appshunter.io/ios/app/interpolation-14/id557950545)

This utility calculates linear or quadratic interpolations. It provides a straightforward tool for mathematical estimations based on given data points.

**Highlights:** Linear interpolation calculation, Quadratic interpolation calculation, Mathematical estimation tool

**Features:** macOS Compatibility

**In-app purchases:** none


### Wader Pilot Logbook

[App page](https://appshunter.io/ios/app/wader-pilot-logbook/id1582209980)

This app simplifies flight logging for pilots, offering an all-in-one solution to track flight hours and access essential information like weather reports. Cloud syncing ensures your records are always safe and accessible from anywhere, fostering a professional aviation network.

**Highlights:** Flight hour monitoring, Integrated weather reports, Cloud syncing for data backup, Professional aviation network, Accessible from anywhere

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Wader Pro Annual | $79.99 | per year |


## Frequently asked questions

### Is Interpolation 1.4 free?

Interpolation 1.4 is free to download, with no in-app purchases.

### Is Wader Pilot Logbook free?

Wader Pilot Logbook is free to download, with in-app purchases available.

### Which has better reviews, Interpolation 1.4 or Wader Pilot Logbook?

Wader Pilot Logbook is rated higher. Interpolation 1.4 averages 3.5 out of 5 from 6 ratings, while Wader Pilot Logbook averages 4.6 from 22 ratings.

### Do Interpolation 1.4 or Wader Pilot Logbook have ads?

Neither Interpolation 1.4 nor Wader Pilot Logbook shows ads.

### Which is updated more often, Interpolation 1.4 or Wader Pilot Logbook?

Interpolation 1.4 ships an update every 3 weeks, and Wader Pilot Logbook every 2 weeks. Most recently, Interpolation 1.4 was updated on October 4, 2026 and Wader Pilot Logbook on October 18, 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.*