CBL Nudge vs Calco
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.
Calco
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Calco is an engaging and educational mathematics game suitable for individuals of all ages. It offers a comprehensive approach to enhancing mathematical proficiency, providing players with the opportunity to challenge their cognitive abilities while simultaneously saving adorable animals. Key Features: * Game Center Leaderboards: Engage in global competitions with friends and fellow players. Monitor your progress and rank among the top performers. * Multiple Difficulty Levels: Select from Easy, Medium, or Hard difficulty options to align with your skill level and maintain the challenge. * Beautiful and Intuitive Design: Experience a clean and modern interface that enhances the learning and gameplay experience. * Quick Rounds: Ideal for short play sessions or extended brain-training sessions. * Educational and Fun: Suitable for children, students, and adults seeking to enhance their mathematical skills in an enjoyable manner. * Ad-Supported: Free to play with non-intrusive advertisements that contribute to the game’s development. Gameplay Mechanics: * Solve Math Problems: Challenge yourself to solve mathematical problems within a specified time frame. * Select Correct Answer: Choose the appropriate answer from multiple options. * Maintain Streak: Earn bonus points and higher scores by maintaining a streak of correct answers. * Lose a Life: Each incorrect answer or time expiration results in a loss of a life. Why Calco? * Enhance Mental Math and Problem-Solving Skills: Calco provides a structured environment that fosters the development of mental math and problem-solving abilities. * Achieve Top Ranking: Compete for the coveted position at the top of the leaderboard. * Family-Friendly and Ad-Supported: Enjoy a welcoming and ad-supported experience suitable for all family members. Download Calco today and embark on your journey to becoming a mathematical master, one problem at a time!
Screenshots
Verdict
The clearest difference is update cadence: CBL Nudge at every 2 days against Calco's every 5 months. 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, Calco every 5 months. The most recent releases landed on October 12, 2026 and October 2, 2026 respectively.
| Parameter | CBL Nudge | Calco |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 days — better | Every 5 months |
| 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 | 12 MB |
| Age rating | 4+ | 17+ |
| Developer | The Challenge Institute | Cole Cobb |
In-app purchases
CBL Nudge
No in-app purchases
Calco
No in-app purchases








