# Persimmon vs Untranslatable

The clearest difference is update cadence: Untranslatable at every 3 days against Persimmon's every 3 weeks. On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Persimmon against 5.0 for Untranslatable. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Persimmon ships an update every 3 weeks, Untranslatable every 3 days. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Persimmon | Untranslatable |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/persimmon-research-simplified/id6747952930/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/untranslatable/id6790902760/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Monetization | Free | Free |
| Size | 23 MB | 14 MB |
| Requires iOS | 18.1 | 18.1 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Momenta Lab LLC](https://appshunter.io/developer/1615879512) | [Yiwen Luo](https://appshunter.io/developer/1721642278) |

## What reviewers say

### Persimmon

[App page](https://appshunter.io/ios/app/persimmon-research-simplified/id6747952930)

This app simplifies complex scientific research papers from arXiv and SocArXiv using AI. It offers customizable summaries tailored to your expertise level and allows you to search, save, and get daily updates on new publications. You can also use it as a basic preprint browser without AI.

**Highlights:** AI-powered paper summaries, Customizable AI models and expertise levels, Search arXiv and SocArXiv, Save papers for offline access, Daily updates and notifications, Privacy-focused, no data collection

**Features:** macOS Compatibility

**In-app purchases:** none


### Untranslatable

[App page](https://appshunter.io/ios/app/untranslatable/id6790902760)

Discover words from other languages that capture unique feelings and concepts English lacks. Learn their meanings, origins, and pronunciation, and build a personal lexicon of your favorites. The app offers a calm, literary design with widgets and reminders to help you savor new vocabulary.

**Highlights:** Daily word discovery, Meaning and origin explanations, Native speaker pronunciation, Usage examples, Search by meaning, Browse by theme/mood/language, Personal lexicon, Spaced review

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

**In-app purchases:** none


## Frequently asked questions

### Is Persimmon free?

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

### Is Untranslatable free?

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

### Which has better reviews, Persimmon or Untranslatable?

Persimmon and Untranslatable are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Persimmon or Untranslatable have ads?

Neither Persimmon nor Untranslatable shows ads.

### Which is updated more often, Persimmon or Untranslatable?

Persimmon ships an update every 3 weeks, and Untranslatable every 3 days. Most recently, Persimmon was updated on October 24, 2026 and Untranslatable on October 21, 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.*