Retro N vs NBack 3D
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Retro N
Engage in retro-style brain training that makes the N-back task enjoyable. Improve memory, focus, and emotional control through a superhero-themed game. Suitable for all ages, it offers a free, ad-supported experience with optional in-app purchases.
- Retro 8-bit N-back gameplay
- Improves memory and focus
- Superhero Ranger theme
- Up to 3 players on one device
- No login or personal data collection
- Minimal ads, child-safe
Read full descriptionHide full description
Retro-style 8-bit brain training that makes N-back fun. Improve memory, focus, and emotional control while playing. “Level 10 is insane!” A surprisingly deep N-back challenge that kids and adults can enjoy for free. 【What Makes This App Different】 ・The only N-back app themed with Retro Game × Superhero Rangers ・All 15 stages completely free (optional tip only) ・Up to 3 players on one device (great for kids, siblings, parents) ・No login, no email, no personal data collected ・Minimal ads, safe for children ・Simple controls anyone can learn instantly 【Player Reviews】 ・“Hard even for adults until you get used to it. The retro RPG-style intro feels exciting.” ・“Surprisingly challenging, but you can feel it working. Finding the rhythm is fun.” ・“I almost gave up at Level 6, but finally cleared it after sticking with it.” 【Does Any of This Sound Familiar?】 ・You forget things more easily ・You struggle to stay focused ・You get irritated without meaning to ・Your thinking feels slower ・You want your smartphone time to be more meaningful This app turns the scientifically studied N-back task into a retro game you can naturally keep playing. 【Recommended For】 ・Anyone who wants to improve emotional control ・People seeking better focus and memory ・Fans of nostalgic retro games ・Those who struggled with other training methods ・Anyone wanting stress relief ・Parents looking for an educational game for kids 【What Is the N-Back Task?】 Introduced by Kirchner in 1958, the N-back method strengthens working memory by recalling information from “N steps earlier” while making quick decisions. Abilities expected to improve include: ・Memory ・Focus and sustained attention ・Judgment ・Emotional regulation Working memory is the mental “workbench” essential for learning, productivity, and daily life. 【Training Design of Memory Rangers】 ・Level 1 starts with remembering one step back (beginner-friendly) ・Difficulty gradually increases across 15 stages ・Level 10 is famously tough for those seeking a challenge ・Retro RPG-style presentation keeps the journey engaging Simple to play, yet you will feel real cognitive challenge as you progress. 【Fun for Families】 One device supports up to 3 profiles, allowing: ・Siblings to compete ・Parents and children to challenge each other ・Friends to enjoy the training together 【Message from the Developer】 N-back is effective but mentally demanding, and many people struggle to keep it going. Still, I believed there were people who wanted to improve emotional balance, focus, and daily well-being. I wanted to create an experience where “you were enjoying a game… and before you knew it, your brain had improved.” That is why I combined the excitement of superhero teams with the warmth of retro games, creating a training method anyone—kids or adults—can continue without stress. If this app brings even a little more calm, focus, or happiness to your daily life, nothing would make me happier. Start your retro brain-training journey today.
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
Read full descriptionHide full description
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 iOS requirement: Retro N at 13.0 against NBack 3D's 15.6. On price, rating, review sentiment and ratings volume 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. Retro N sells 4 one-off in-app purchases and NBack 3D sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 5.0 for Retro N against 5.0 for NBack 3D. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Retro N ships an update every 8 months, NBack 3D every 10 months. The most recent releases landed on September 10, 2026 and September 11, 2026 respectively.
| Parameter | Retro N | NBack 3D |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Every 8 months — better | Every 10 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 74 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | TELULU LLC | Yasuyoshi Ota |
Customer experience
Retro N
NBack 3D
In-app purchases
Retro N
- Support for this app (100)$0.49
- Remove Ads$2.99
- Support for this app (500)$2.99
Show 1 moreShow fewer
- Support for this app (1000)$5.99
NBack 3D
- Extend to 20'Back & Remove Ads$2.99






