# N vs Selfseeds Spark Tracker

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.

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.

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

## The numbers

| Metric | N | Selfseeds Spark Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (237 ratings)](https://appshunter.io/ios/app/n-back-challenge/id1524599079/reviews)** | — |
| Number of ratings | **237** | — |
| Positive reviews | 82.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 72 MB | 70 MB |
| Requires iOS | 16.4 | **14.0.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Rivuspurus](https://appshunter.io/developer/1171945549) | [Susan Eoff](https://appshunter.io/developer/1885678019) |

## What reviewers say

### N

[App page](https://appshunter.io/ios/app/n-back-challenge/id1524599079)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (monthly) | $8.99 | per month |
| Premium (annual) | $54.99 | per year |
| 1 cup of coffee | $1.99 | one-time |
| 4 cups of coffee | $5.99 | one-time |
| Pizza | $7.99 | one-time |
| 7  cups of coffee | $8.99 | one-time |
| 10  cups of coffee | $10.99 | one-time |

**What reviewers like**

- 🧠 Effective working memory improvement
- 🎮 Excellent gamification and motivation system
- 💰 Free to use with affordable payment options
- 🎨 Clean, polished, intuitive user interface
- 📚 Scientifically-backed with educational articles

**What reviewers complain about**

- 🐛 Frequent mid-session freezes and crashes
- 🔊 Unclear letter pronunciation (some letters sound similar)
- 💳 Controversial 'coffee' paywall for missed days
- 🔌 Requires internet connection (not offline compatible)
- ⚠️ Inconsistent instant feedback on answers

**Reported bugs**

- 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

**Requested features**

- 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


### Selfseeds Spark Tracker

[App page](https://appshunter.io/ios/app/selfseeds-spark-tracker/id6760678468)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Supporter Access | $20.00 | one-time |
| Full Access | $30.00 | one-time |
| Sponsor Access | $100.00 | one-time |


## Frequently asked 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.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*