# Interpolation 1.4 — user reviews

> 6 indexed App Store user reviews of Interpolation 1.4 by ZOFTERM, rated 3.50/5 from 6 ratings.

- Source: https://appshunter.io/ios/app/interpolation-14/id557950545/reviews
- App overview in markdown: https://appshunter.io/ios/app/interpolation-14/id557950545.md
- Rating breakdown: 5★ 3 · 4★ 0 · 3★ 1 · 2★ 1 · 1★ 1

## Most critical reviews (6 lowest-rated)

### 1/5 — Lacks negative values

*2019-09-05*

Could be a great app if I could enter negative values

### 2/5 — Numbers don’t start/end at zero

*2024-03-07*

What is the best until I realized there is no way to enter a negative number (?)

### 2/5 — Keyboard

*2022-08-23*

Keyboard has no negative available. Can’t input a negative number.

### 3/5 — Good for all positive number interpolation.

*2023-07-15*

I can’t find a way to enter negative numbers.

### 5/5 — An incredibly useful app

*2018-03-19*

Though this app is for more specialized use, it nonetheless distinguished itself as an excellent source for quick, easy interpolation. 

The updated keyboard is a dramatic improvement on an already useful app. For anyone looking to do some interpolation, I highly recommend this product.

### 5/5 — Does just what it says

*2013-07-11*

Nice and simple, does the job.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*