# Interpolation 1.4 vs CrowdMag

The clearest difference is rating: CrowdMag at 4.3 against Interpolation 1.4's 3.5. CrowdMag also leads on review sentiment (53% vs 33%) and ratings volume (24 vs 6). Interpolation 1.4's advantage is update cadence (every 3 weeks vs every 2 months) and iOS requirement (9.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

CrowdMag holds the better App Store score, 4.3 against 3.5. Both are backed by a comparable volume of ratings — 6 and 24 respectively. Written reviews point the same way: 33% of Interpolation 1.4's written reviews are positive against 53% of CrowdMag's.

Interpolation 1.4 ships an update every 3 weeks, CrowdMag every 2 months. The most recent releases landed on October 4, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Interpolation 1.4 | CrowdMag |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (6 ratings)](https://appshunter.io/ios/app/interpolation-14/id557950545/reviews) | **[4.3 (24 ratings)](https://appshunter.io/ios/app/crowdmag/id910578825/reviews)** |
| Number of ratings | 6 | **24** |
| Positive reviews | 33.3% of reviews | **52.9% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 1 MB | 18 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ZOFTERM](https://appshunter.io/developer/557950548) | [University of Colorado Boulder](https://appshunter.io/developer/972210292) |

## 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


### CrowdMag

[App page](https://appshunter.io/ios/app/crowdmag/id910578825)

This app allows users to measure and contribute to scientific research on Earth's magnetic field using their smartphone. It offers features for recording magnetic data during various activities, including flights, and provides tools for data visualization and analysis.

**Highlights:** Measure magnetic field data, Contribute to scientific research, Record data during flights, Visualize data on maps and graphs, Magnetic calculator with WMM2020, Live magnetic compass, Export data via email/Google Drive

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Interpolation 1.4 free?

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

### Is CrowdMag free?

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

### Which has better reviews, Interpolation 1.4 or CrowdMag?

CrowdMag is rated higher. Interpolation 1.4 averages 3.5 out of 5 from 6 ratings, while CrowdMag averages 4.3 from 24 ratings.

### Do Interpolation 1.4 or CrowdMag have ads?

Neither Interpolation 1.4 nor CrowdMag shows ads.

### Which is updated more often, Interpolation 1.4 or CrowdMag?

Interpolation 1.4 ships an update every 3 weeks, and CrowdMag every 2 months. Most recently, Interpolation 1.4 was updated on October 4, 2026 and CrowdMag on October 9, 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.*