# DeltaBook vs Paralango

The clearest difference is iOS requirement: DeltaBook at 13.0 against Paralango's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. DeltaBook sells 1 in-app purchase, starting at $11.99 per month and Paralango sells 2 in-app purchases, starting at $2.00 per month. Whichever you choose, the download price is not the number that matters.

DeltaBook ships an update weekly, Paralango every 6 days. The most recent releases landed on November 5, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | DeltaBook | Paralango |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/paralango/id6795933686/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 6 days** |
| Monetization | — | Free with in-app purchases |
| Size | 57 MB | 24 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Adam Weaver](https://appshunter.io/developer/1728008045) | [慧 张](https://appshunter.io/developer/6794973759) |

## What reviewers say

### DeltaBook

[App page](https://appshunter.io/ios/app/deltabook/id6762256857)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium Access | $11.99 | per month |


### Paralango

[App page](https://appshunter.io/ios/app/paralango/id6795933686)

Learn languages by interacting with your environment. Take photos of objects, and the app will label them in your chosen language. Access detailed word cards with pronunciation and examples, and save vocabulary for future study.

**Highlights:** Photo analysis for object identification, Object labeling in selected languages, Word cards with pronunciation and examples, Save scenes and words for review, Switch between learning languages

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $2.00 | per month |
| Premium Annual | $20.00 | per year |


## Frequently asked questions

### Is DeltaBook free?

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

### Is Paralango free?

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

### Do DeltaBook or Paralango have ads?

Neither DeltaBook nor Paralango shows ads.

### Which is updated more often, DeltaBook or Paralango?

DeltaBook ships an update weekly, and Paralango every 6 days. Most recently, DeltaBook was updated on November 5, 2026 and Paralango on October 24, 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.*