# CBL Nudge vs HiDuck

The clearest difference is update cadence: CBL Nudge at every 2 days against HiDuck's every 10 days. CBL Nudge also leads on device support (3 vs 1) and iOS requirement (9.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

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

CBL Nudge ships an update every 2 days, HiDuck every 10 days. The most recent releases landed on October 12, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | CBL Nudge | HiDuck |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cbl-nudge/id1403826548/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 10 days |
| Monetization | Free | — |
| Size | 18 MB | 24 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [The Challenge Institute](https://appshunter.io/developer/1439705849) | [Joao Mergulhao](https://appshunter.io/developer/1768313992) |

## What reviewers say

### CBL Nudge

[App page](https://appshunter.io/ios/app/cbl-nudge/id1403826548)

This app offers prompts and activities inspired by Nudge theory and Oblique Strategies to help users overcome challenges in the Challenge Based Learning process. When you encounter a roadblock, request a nudge and follow the suggested idea, or ask for a new one if it doesn't fit.

**Highlights:** Nudge theory inspiration, Oblique Strategies integration, Challenge Based Learning support, Problem-solving prompts, Activity suggestions, Stuck phase navigation

**Features:** macOS Compatibility

**In-app purchases:** none


### HiDuck

[App page](https://appshunter.io/ios/app/hiduck-your-study-buddy/id6737779740)

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

**In-app purchases:** none


## Frequently asked questions

### Is CBL Nudge free?

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

### Is HiDuck free?

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

### Do CBL Nudge or HiDuck have ads?

Neither CBL Nudge nor HiDuck shows ads.

### Which is updated more often, CBL Nudge or HiDuck?

CBL Nudge ships an update every 2 days, and HiDuck every 10 days. Most recently, CBL Nudge was updated on October 12, 2026 and HiDuck on October 4, 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.*