Comparison

N vs Selfseeds Spark Tracker

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

N

This app offers a scientifically validated cognitive training program designed to enhance intelligence. It uses the dual n-back method to improve learning, reasoning, and problem-solving skills. Track progress, compete with friends, and customize your experience to boost cognitive abilities.

Highlights
  • Dual n-back cognitive training
  • IQ enhancement
  • Progress tracking and streaks
  • Social competition and leaderboards
  • Customizable voices and settings
  • Weekly habit option
Read full description

The N-Back Challenge provides a special type of cognitive training, “dual n-back,” that helps you raise your IQ in just a few minutes per day. Sounds implausible? The N-Back Challenge is based on a decade’s worth of scientific studies, published in top peer-reviewed journals, including Nature. (For more details, see https://nbackchallenge.com/science.) The catch? It’s no fun at all! Indeed, the training is designed to be maximally exhausting. If you are determined enough to make it through 20 sessions, however, science suggests that you stand to reap powerful benefits. Intelligence is the ultimate cognitive ability: You need it to learn, reason, solve novel problems, and see connections. Higher IQs have been linked to improved academic achievement, professional success, and even better health. Since it will take you just 7 hours, in total, to complete the N-Back Challenge, not much more than the length of a single school day, it may prove to be the best investment of time you’ve ever made! ------------------------------ SCIENTIFICALLY SOUND: Not only has the dual n-back paradigm been validated in top peer-reviewed journals, but our two founders – both PhDs, one with a focus on neuroscience, the other with a focus on higher education – have taken particular care to thoroughly align the app with the prevailing scientific research. TRACK YOUR PROGRESS: In order to help you stay motivated, the N-Back Challenge allows you to visually monitor your progress over time, build up “streaks,” and compare yourself against other learners across various stats. COMPETE AGAINST YOUR FRIENDS: Perhaps the most powerful way of making sure you remain motivated to complete the Challenge is to tackle it together with friends or colleagues. To make it more fun, we’ve provided leaderboards that allow you to compete based on who has completed the most sessions, racked up the longest streak, and more. CUSTOMIZE YOUR EXPERIENCE: The N-Back Challenge allows you to choose between different voices across multiple languages, turn on notifications, and customize their timing and style. There are advanced settings for turning on instant button feedback, controlling the n-back level, and tweaking the game speed. And if you are too busy to complete one session every day, you may switch to the Weekly Habit, which gives you a full week to complete each session. ------------------------------ ARE YOU… … A PARENT? Give your children an edge at school or university by nudging them to complete the N-Back Challenge. Indeed, why not tackle the Challenge together as a family? … A GRANDCHILD? Help your grandparents (and other older relatives) fight cognitive decline by introducing them to dual n-back. (See https://nbackchallenge.com/decline.) … A KNOWLEDGE WORKER? Share the N-Back Challenge with your HR department. Dual n-back may well be the single most cost-effective way of making knowledge workers more productive. (See https://nbackchallenge.com/work.) … A TEACHER? Use dual n-back to enhance students' problem-solving skills. You can have a big impact, with a minimal investment of time! (See https://nbackchallenge.com/class.) ------------------------------ HOW IT WORKS: The N-Back Challenge is free as long as you stick to the program. When you miss or delay a session, we ask you to support us with a “coffee,” which you can buy in-app or earn — for example, by using the Share link in the Settings to invite friends. (Each of you will receive a free coffee.) You can also unlock unlimited free breaks by becoming a premium subscriber. CUSTOMER SUPPORT: Do you have any questions or suggestions? Like to say hello? We’re happy to hear from you! Just drop us a note at support@nbackchallenge.com. ADDITIONAL RESOURCES: To learn more about dual n-back and the N-Back Challenge, browse our repository of articles at https://nbackchallenge.com/articles. Privacy Policy: https://nbackchallenge.com/privacy-policy Terms of Use: https://nbackchallenge.com/terms-of-use

About

Selfseeds Spark Tracker

Features
Read full description

Notice a spark. Plant a seed. Watch your spiral grow. Selfseeds Spark Tracker is a gentle noticing app where small moments of awareness become seeds that grow into a living spiral throughout your week. As you plant your daily Selfseeds, you begin to rediscover your natural awareness — without pressure, without fixing, and without overwhelm. Each time you notice a spark, you plant a simple seed into your personal spiral tracker, creating a calm daily rhythm you can return to anytime. Over time, your spiral becomes a reflection of the small moments that shape your days. There are no streaks to maintain. No goals to hit. No fixing required. Just noticing. How It Works • Notice a spark — something small, meaningful, or alive: a warm cup of tea, a kind word, sunlight on the floor, or your dog’s happy tail • Plant a seed into your spiral • Watch your spiral grow throughout the week • Return anytime to revisit what you noticed Your spiral is visual, calm, and personal. It grows as you do. Inside Your In-App Sanctuary Everything is designed to support calm noticing. Move at your own pace. Spark Tracker — grow your weekly spiral Spiral Library — quiet story moments for gentle inspiration Seed Vault Notes — write, save, and revisit reflections Storybook Audio Collection — listen when you prefer to rest your eyes Optional Shop — explore when and if you choose Everything is optional. Nothing is required. Selfseeds Spark Tracker is designed for children, teens, adults, and older adults alike. It works beautifully: • At home • In classrooms and learning spaces • After-school programs • Wellness spaces • At the office between tasks • During sports or movement • On a walk with your dog • During quiet morning or evening moments It is not a productivity app. It is not a mental health program. It is a simple awareness practice you can carry anywhere. Why It Matters Small moments shape how we feel. When we notice them, they grow. Selfseeds Spark Tracker helps you remember what is already here — one small spark at a time. Notice a spark. Plant a seed. Watch your spiral grow.

Screenshots

N4 screens
Selfseeds Spark Tracker4 screens

Verdict

The call

The clearest difference is ads: N at none against Selfseeds Spark Tracker's shown. Selfseeds Spark Tracker's advantage is update cadence (weekly vs monthly) and device support (3 vs 1). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. N sells 7 in-app purchases, starting at $8.99 per month and Selfseeds Spark Tracker sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

N ships an update monthly, Selfseeds Spark Tracker weekly. The most recent releases landed on September 25, 2026 and September 10, 2026 respectively.

Scorecard4 real differences · 6 level
N versus Selfseeds Spark Tracker: the parameters behind the verdict, then further details
ParameterNSelfseeds Spark Tracker
PriceFreeFree
Rating4.7 (237 ratings) — better—
Positive reviews82.8% of reviews—
Number of ratings237 — better—
Update frequencyMonthlyWeekly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.414.0.0 — better
Further details — not scored
Size72 MB70 MB
Age rating17+4+
DeveloperRivuspurusSusan Eoff

Bugs and requests

N

Reported bugs

10 issues
  • Mid-session freezing and soft locks (most common)
  • Sound not generating for letters during gameplay
  • Buttons greyed out preventing interaction
  • App crashes when accessing stats
  • Double coffee charge on streak breaks
Show 5 more
  • Sound disabled when button pressed simultaneously with letter
  • App crashes on startup
  • Sync failures between iPad and iPhone
  • Game freezing on specific levels (Level 2, 4)
  • Countdown ends but first tile/letter doesn't appear

Requested features

10 requests
  • Single n-back and quad n-back modes
  • Lock screen widgets for streak reminders
  • Color-position dual n-back mode
  • More granular settings (interference, probability, trial count)
  • Penalty system for incorrect answers
Show 5 more
  • Game Center leaderboard integration
  • iPad and desktop versions with synced accounts
  • Offline gameplay capability
  • Data export for personal analysis
  • Extended play duration at higher levels

Selfseeds Spark Tracker

Not enough reviews yet to summarise bugs or requests.

In-app purchases

7 purchases

N

Subscriptions2
  • Premium (monthly)$8.991 Month
  • Premium (annual)$54.991 Year
One-time5
  • 1 cup of coffee$1.99
  • 4 cups of coffee$5.99
  • Pizza$7.99
Show 2 more
  • 7 cups of coffee$8.99
  • 10 cups of coffee$10.99
3 purchases

Selfseeds Spark Tracker

One-time3
  • Supporter Access$20.00
  • Full Access$30.00
  • Sponsor Access$100.00

Questions

Is N free?
N is free to download, with in-app purchases available.
Is Selfseeds Spark Tracker free?
Selfseeds Spark Tracker is free to download, with in-app purchases available.
Do N or Selfseeds Spark Tracker have ads?
Selfseeds Spark Tracker shows ads; N does not.
Which is updated more often, N or Selfseeds Spark Tracker?
N ships an update monthly, and Selfseeds Spark Tracker weekly. Most recently, N was updated on September 25, 2026 and Selfseeds Spark Tracker on September 10, 2026.

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