# Lien vs BigO Algorithms

The clearest difference is in-app purchases: Lien at none against BigO Algorithms's 2. BigO Algorithms's advantage is update cadence (every 4 days vs every 8 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. BigO Algorithms sells 2 in-app purchases, starting at $7.99 per month. Lien asks for nothing beyond the download.

Lien ships an update every 8 days, BigO Algorithms every 4 days. The most recent releases landed on October 17, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Lien | BigO Algorithms |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/bigo-algorithms/id6761836617/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 4 MB | 25 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Luis Filipe Pedroso](https://appshunter.io/developer/1796919881) | [Gregori Farias](https://appshunter.io/developer/1891708605) |

## What reviewers say

### Lien

[App page](https://appshunter.io/ios/app/lien-vocabulary-bridge/id6742116105)

**Features:** macOS Compatibility

**In-app purchases:** none


### BigO Algorithms

[App page](https://appshunter.io/ios/app/bigo-algorithms/id6761836617)

This app provides a technical environment for software engineers and computer science students to prepare for interviews. It uses AI-powered mentorship and visual complexity curves to help users understand logic and analyze code errors.

**Highlights:** AI-powered mentorship, Dual-clue analysis (Static Blueprints & OpenAI), Big O complexity curve visualization, Dark-mode first aesthetic, Code error analysis, Logic-focused learning

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BigO Premium Monthly | $7.99 | per month |
| BigO Premium Annual | $57.99 | per year |


## Frequently asked questions

### Is Lien free?

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

### Is BigO Algorithms free?

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

### Do Lien or BigO Algorithms have ads?

Neither Lien nor BigO Algorithms shows ads.

### Which is updated more often, Lien or BigO Algorithms?

Lien ships an update every 8 days, and BigO Algorithms every 4 days. Most recently, Lien was updated on October 17, 2026 and BigO Algorithms on October 8, 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.*