# OpticLingo vs Unterra

The clearest difference is in-app purchases: OpticLingo at none against Unterra's 3. Unterra's advantage is update cadence (every 4 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Unterra sells 3 in-app purchases, starting at $1.99 per month. OpticLingo asks for nothing beyond the download.

OpticLingo ships an update every 3 weeks, Unterra every 4 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | OpticLingo | Unterra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (3 ratings)](https://appshunter.io/ios/app/unterra/id6780282962/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 16.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 10 MB | 58 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Umar Muzaffar](https://appshunter.io/developer/1896628957) | [NPDesigned LLC](https://appshunter.io/developer/1659684889) |

## What reviewers say

### OpticLingo

[App page](https://appshunter.io/ios/app/opticlingo-ai-translator/id6775466085)

**Features:** iPhone Duo support

**In-app purchases:** none


### Unterra

[App page](https://appshunter.io/ios/app/unterra/id6780282962)

This app creates a personal map of your real-world travels, revealing fog as you explore new streets, cities, and countries. Track your progress, earn badges for milestones, and customize your exploration experience.

**Highlights:** Personalized exploration map, Fog reveals as you travel, Tracks roads, cities, states, and countries, Earn badges for exploration milestones, Customizable reveal radius, Metric and imperial units

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unterra Pro - Monthly | $1.99 | per month |
| Unterra Pro | $14.99 | per year |
| Unterra Pro - Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is OpticLingo free?

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

### Is Unterra free?

Unterra is free to download, with in-app purchases available.

### Do OpticLingo or Unterra have ads?

Neither OpticLingo nor Unterra shows ads.

### Which is updated more often, OpticLingo or Unterra?

OpticLingo ships an update every 3 weeks, and Unterra every 4 days. Most recently, OpticLingo was updated on November 5, 2026 and Unterra on October 31, 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.*