# 3D Interpolation vs Kotha

The clearest difference is review sentiment: Kotha at 58% against 3D Interpolation's 0%. Kotha also leads on price (Free vs $9.99) and update cadence (monthly vs every 37 months). 3D Interpolation's advantage is ads (none vs shown) and device support (3 vs 1). On in-app purchases there is nothing between them.

Kotha is free to download; 3D Interpolation costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

3D Interpolation ships an update every 37 months, Kotha monthly. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | 3D Interpolation | Kotha |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[4.0 (5 ratings)](https://appshunter.io/ios/app/kotha/id1188060798/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | 0.0% of reviews | **57.7% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 37 months | **Monthly** |
| Monetization | Paid | **Ad-supported** |
| Size | 7 MB | 252 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Carlos Moura](https://appshunter.io/developer/407501202) | [Kotha Apps & Technologies Ltd.](https://appshunter.io/developer/1069719671) |

## What reviewers say

### 3D Interpolation

[App page](https://appshunter.io/ios/app/3d-interpolation/id1000298349)

Calculate key directional drilling parameters like TVD, coordinates, and displacement. This tool aids drilling engineers and students in oil well directional drilling by interpolating survey data.

**Highlights:** Calculate TVD, N/S, E/W coordinates, Determine Horizontal Displacement, Calculate Dog-Leg Severity, Measure Build-Up Rate, Calculate Turn Rate, Interpolate parameters between survey stations

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

**In-app purchases:** none


### Kotha

[App page](https://appshunter.io/ios/app/kotha/id1188060798)

Connect with friends and family using instant messaging, audio/video calls, and group chats. Share various file types and express yourself with stickers. Discover local services, news, and entertainment within the app.

**Highlights:** Instant messaging, Audio/video calls, Group chatting, File sharing, Bengali transliteration, Discover section with mini apps, News and entertainment

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 3D Interpolation free?

3D Interpolation costs $9.99, with no in-app purchases.

### Is Kotha free?

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

### Do 3D Interpolation or Kotha have ads?

Kotha shows ads; 3D Interpolation does not.

### Which is updated more often, 3D Interpolation or Kotha?

3D Interpolation ships an update every 37 months, and Kotha monthly. Most recently, 3D Interpolation was updated on October 2, 2026 and Kotha on October 7, 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.*