Number Recall vs NBack 3D
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Number Recall
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Features of Number Recall • Three educational games that help students (ages 9-12) exercise their memory • Players must find sequences of numbers in forward and reverse order • Helps train attention, memory and focus • Difficulty level is automatically adjusted • Two-Player Option is available • Scores are automatically saved to show progress and can be used to identify a child's success. • Scores can also be emailed to keep a record of a child's progress. • Colorful graphics and lively music make this game fun to play • Kid-safe: No third party ads or tracking This game helps children develop their memory and attention skills while providing practice recognizing numbers. Children, ages 9 to 12, will have fun playing and learning in settings ranging from a construction site teeming with dump trucks to high in the sky among hot air balloons. All of BrainTrain games are specially created to help children practice the cognitive abilities important in school and life. The games automatically adjust to allow children to learn at a level of difficulty personalized for them. As they succeed, new challenges at harder levels will be presented. Children will be challenged to develop their thinking speed as they are required to respond faster and faster in order to win. While a child's difficulty level is automatically adjusted based on his or her performance, it can be easily modified by parents or teachers when necessary. Distraction stimuli can also be added to reinforce increased focus and the ability to stay on task. In addition, a two player option is available which helps children learn how to take turns and be both a good winner and a good loser. This memory training game for numbers becomes more challenging as players succeed and improve their memory. Each game level must be completed for grades to be saved in single player mode. Please note that no grades are saved in two player mode. Two player mode only records which Player (1 or 2) won the match after three rounds are completed. A training session is completed only when the program is stopped and then removed from memory. If the program is left open in the background and it is selected, then the last session started will be continued.
NBack 3D
This app challenges your memory by requiring you to count 3D shapes of specific colors. As the 'N' value increases, the difficulty escalates, testing your ability to recall past stimuli in a sequence.
- N-Back memory challenge
- 3D shape and color recognition
- Increasing difficulty levels
- Sequence memorization
- Cognitive skill enhancement
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The task is only to count the 3D shapes of the specified shape and color, but as the N of the N ‘Back increases, it becomes more difficult. *N’Back : The current answer matches the one from N steps earlier in the sequence. *1’Back 1 task1: count & memorize 2 task2: count & memorize 3 answer for task1 4 task3: count & memorize 5 answer for task2 6 task4: count & memorize : *2’Back 1 task1: count & memorize 2 task2: count & memorize 3 task3: count & memorize 4 answer for task1 5 task4: count & memorize 6 answer for task2 7 task5: count & memorize :
Screenshots
Verdict
The clearest difference is in-app purchases: Number Recall at none against NBack 3D's 1. Number Recall also leads on ads (none vs shown). NBack 3D's advantage is update cadence (every 10 months vs every 39 months) and iOS requirement (15.6 vs 17.0). On price and device support 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. NBack 3D sells 1 one-off in-app purchase. Number Recall asks for nothing beyond the download.
Number Recall ships an update every 39 months, NBack 3D every 10 months. The most recent releases landed on November 11, 2026 and November 6, 2026 respectively.
| Parameter | Number Recall | NBack 3D |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 39 months | Every 10 months — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 43 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | BrainTrain Inc. | Yasuyoshi Ota |
In-app purchases
Number Recall
No in-app purchases
NBack 3D
- Extend to 20'Back & Remove Ads$2.99









