# ChallengeCircle vs BASLN

The clearest difference is ads: BASLN at none against ChallengeCircle's shown. BASLN also leads on update cadence (weekly vs fortnightly). ChallengeCircle's advantage is iOS requirement (15.1 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. ChallengeCircle sells 4 in-app purchases, starting at $0.99 per 7 days and BASLN sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ChallengeCircle ships an update fortnightly, BASLN weekly. The most recent releases landed on September 20, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | ChallengeCircle | BASLN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/basln/id6762063362/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 57 MB | 4 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [AGBO Ventures LTD](https://appshunter.io/developer/1362276420) | [John Zic](https://appshunter.io/developer/1892713791) |

## What reviewers say

### ChallengeCircle

[App page](https://appshunter.io/ios/app/challengecircle/id6757082724)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $0.99 | per 7 days |
| Monthly Premium | $2.99 | per month |
| Monthly Premium | $24.99 | per year |
| Premium | $59.99 | one-time |


### BASLN

[App page](https://appshunter.io/ios/app/basln/id6762063362)

Measure your cognitive performance with research-validated tests. Establish a personal baseline and track readiness zones. Correlate custom variables with your scores and receive evidence-ranked recovery protocols.

**Highlights:** 6 research-validated cognitive tests, Personalized baseline establishment, Readiness zones (Locked In, Good to Go, Off Day, Impaired), Custom variable correlation, Evidence-ranked recovery protocols, Trend analytics across cognitive domains, Data portability via CSV export

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basln | $4.99 | per month |
| Basln | $29.99 | per year |


## Frequently asked questions

### Is ChallengeCircle free?

ChallengeCircle is free to download, with in-app purchases available.

### Is BASLN free?

BASLN is free to download, with in-app purchases available.

### Do ChallengeCircle or BASLN have ads?

ChallengeCircle shows ads; BASLN does not.

### Which is updated more often, ChallengeCircle or BASLN?

ChallengeCircle ships an update fortnightly, and BASLN weekly. Most recently, ChallengeCircle was updated on September 20, 2026 and BASLN on September 9, 2026.

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