CBL Nudge vs HiDuck
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CBL Nudge
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.
- Nudge theory inspiration
- Oblique Strategies integration
- Challenge Based Learning support
- Problem-solving prompts
- Activity suggestions
- Stuck phase navigation
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Sometimes we struggle during the Challenge Based Learning process - this app provides nudges to help when you get stuck. Combining the concepts of Nudge theory and Brian Eno’s Oblique Strategies, CBL Nudge provides questions and activities for when you get stuck during the different phases of the Challenge Based Learning process. Navigate to the area where you are stuck, ask for a nudge and then follow the idea presented. If that one does not fit or work ask for a new nudge.
HiDuck
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With Hi Duck, you'll never forget what you learned! This app combines the spaced review technique with learning tools that facilitate learning retention. Record audio explaining the content to your Rubber Duck – the "talk to your duckling" technique that facilitates memorization. Main Features: - Spaced Review: Receive reminders to review your audio recordings after 1 day, 1 week, and 30 days. - Smart Summary: After saving an audio recording, you can automatically generate a smart summary of what was said, available in your Notes for easy reference. - Gamification: Complete challenges, earn coins, and unlock exclusive accessories to customize your duck! - Complete Customization: Organize your studies with tags for each category and highlight your notes with colors, all to make your learning your own.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | CBL Nudge | HiDuck |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 days — better | Every 10 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 9.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 18 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | The Challenge Institute | Joao Mergulhao |
In-app purchases
CBL Nudge
No in-app purchases
HiDuck
No in-app purchases









