# BASLN — Cognitive Readiness Testing > Cognitive readiness testing app measuring brain performance, not just physiological metrics. (iPhone/iPad app by John Zic.) - Source: https://appshunter.io/ios/app/basln/id6762063362 (this page in markdown: same URL + `.md`) - Developer: [John Zic](https://appshunter.io/developer/1892713791) - Category: Health & Fitness - Price: Free with in-app purchases - Rating: 5.00/5 from 3 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 17.0 · 4 MB - Languages: English - Released: 2026-04-14 - Data updated: 2026-07-08 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/basln/id6762063362/reviews.md ## What is BASLN? Measure your actual cognitive performance every morning. Not your heart rate. Not your sleep stages. Your brain. Whoop, OURA, and Apple Watch measure heart rate variability and guess how your brain is doing. Your wearable can tell you your nervous system is stressed. It can't tell you your reaction time is 80ms slower than yesterday. BASLN measures the thing itself. 6 RESEARCH-VALIDATED TESTS. 5 MINUTES. - Psychomotor Vigilance (PVT-B): the gold standard fatigue measure, used on the International Space Station - Spatial 2-Back: canonical spatial working memory test, validated across decades of cognitive neuroimaging research - Digit Symbol Substitution (DSST): the single best predictor of complex operational performance - Color-Word Stroop: executive function and inhibitory control - Arithmetic Verification: processing speed under cognitive load - Trail Making B: cognitive flexibility and task switching YOUR PERSONAL BASELINE Your first 5 sessions establish your personal baseline. Every session after that is scored against your own norm. 0-100 scale. No comparison to population averages. Just you vs you. READINESS ZONES 90-100: Locked In 75-89: Good to Go 60-74: Off Day (recovery protocols activate) 0-59: Impaired CUSTOM CORRELATIONS Track what you actually care about. Define your own variables (creatine, cold plunge minutes, supplement stacks) and see how they correlate with your readiness score over time. Binary, continuous, or categorical. RECOVERY PROTOCOLS Score below 75? Get evidence-ranked recovery recommendations: cold exposure, bright light therapy, strategic caffeine timing, high-intensity exercise, nap protocols. Each ranked by time-to-effect and evidence quality. ANALYTICS Track trends across all 6 cognitive domains. See how sleep, caffeine, exercise, and your own custom variables correlate with your scores. Compare your current performance against your original baseline to catch long-term drift. DATA PORTABILITY Export your full history as CSV anytime. Import a BASLN CSV on another device to restore after a reinstall. Every export roundtrips cleanly, no data loss, no lock-in. PRIVACY BASLN collects nothing. Zero. No accounts, no analytics SDKs, no tracking pixels, no telemetry. BASLN has no servers of its own. Your cognitive history syncs across your Apple devices through your private iCloud, end-to-end encrypted. Neither Apple nor BASLN can read it. You can disable iCloud Sync in Settings if you prefer data to live only on the local device. NO WEARABLE. NO ACCOUNT. NO TRACKING. Free to try (10 full sessions). Pro unlocks unlimited sessions, full analytics, and data export. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://basln.app/privacy ## Key features - 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 ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Basln | $29.99 | per year | | Basln | $4.99 | per month | ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/basln/id6762063362/reviews.md ### 5/5 — Just started using *2026-04-15* Great way to test & track your raw brain horsepower. Can’t wait to see my improvement ## Frequently asked questions about BASLN ### What is BASLN? BASLN is a health and fitness app designed to measure your actual cognitive performance through a series of research-validated tests. It focuses on metrics like reaction time and cognitive function, rather than just heart rate or sleep stages. ### How does BASLN establish a personal baseline? Your first five sessions with BASLN are used to establish your personal baseline. Subsequent sessions are scored against this individual norm on a 0-100 scale, providing a personalized performance comparison. ### What are the 'Readiness Zones' in BASLN? BASLN categorizes your cognitive performance into four Readiness Zones: 'Locked In' (90-100), 'Good to Go' (75-89), 'Off Day' (60-74), and 'Impaired' (0-59). Scoring in the 'Off Day' zone may trigger recovery protocols. ### Can I track custom factors with BASLN? Yes, BASLN allows you to define and track custom variables such as supplements, exercise, or cold plunge minutes. You can then see how these variables correlate with your cognitive readiness scores over time. ### What kind of recovery recommendations does BASLN offer? If your score falls below 75, BASLN provides evidence-ranked recovery recommendations. These may include cold exposure, bright light therapy, strategic caffeine timing, high-intensity exercise, and nap protocols, ranked by time-to-effect and evidence quality. ### Is my data private with BASLN? BASLN prioritizes privacy by collecting zero data. Your cognitive history syncs via end-to-end encrypted iCloud across your Apple devices, meaning neither Apple nor BASLN can access it. You can disable iCloud Sync for local-only storage. ### What are the subscription options for BASLN? BASLN offers a free trial with 10 full sessions. A Pro subscription unlocks unlimited sessions, full analytics, and data export. Subscription plans are available at $4.99 per month or $29.99 per year. ### Does BASLN have ads? No, BASLN does not contain advertisements. The app is free to try, with optional in-app purchases for full features, ensuring an ad-free user experience. ## Version history (last 4 releases) ### 2.0.0 — 2026-05-18 This update fixes a bug from an earlier version that may have caused sample test data to appear in your history, including an inflated streak counter. If you were affected, BASLN will automatically clean up the unwanted data and rebuild your streak and baselines from your real sessions within a few seconds of opening the app. If anything still looks off after updating, go to Settings → Data Recovery → "Rescan for sample data" to flush any records that may have arrived later via iCloud sync. Your real test results are preserved. Thank you for your patience. ### 1.3.0 — 2026-05-11 Stability and polish. • Fixed a launch issue that affected fresh installs. • iCloud sync is now properly wired. If you previously assumed your sessions were syncing, open Settings to verify. • Pro users: the upgrade screen no longer briefly appears when you open the app. • Long-Term Trajectory: tapping a session keeps the detail visible until you close it. Rotation is smoother. The Adaptive Baseline line now appears only after your Starting Baseline locks at session 21, with a clear marker showing the transition. ### 1.0.1 — 2026-04-16 Increased free tier from 3 to 10 sessions. Bug fixes. ### 1.0 — 2026-04-15 No release notes. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-08.*