Know the model before you install.
Modern Methods does not sell subscriptions on this website. Microsoft and Apple handle purchases and subscription management inside their official stores.
Sentinel AI
Microsoft Store states that Sentinel AI provides basic functionality free with no time limit. Advanced features require a paid subscription.
- Basic functionality: free, no time limit
- Advanced functionality: paid subscription
- Purchase and management: Microsoft Store
- Current subscription price: shown in the Microsoft purchase flow
Decide For Us
Decide For Us is free to download with optional Premium in-app purchases.
- Free download
- Optional Premium
- Apple currently lists Premium purchases at $4.99 and $39.99
- Billing period, renewal, and final terms: shown in Apple's purchase flow
Using Microsoft and Apple keeps payment details and subscription management inside the accounts customers already use. Store prices and terms can change, so the official purchase screen is the source of truth at checkout.
What you can use free — and what Premium adds
Basic access: Free
Use Sentinel AI’s basic functionality without a time limit. A paid Microsoft Store subscription unlocks advanced features, including computer optimization, Advanced AI Deep Search, and security monitoring.
Why a subscription? Premium Sentinel AI features include ongoing monitoring and AI-assisted capabilities that require continued service and development. Microsoft handles the purchase and subscription management.
See current Sentinel AI subscription offerDownload: Free
Start with the free App Store download. Optional Premium in-app purchases are shown by Apple at $4.99 and $39.99. Apple displays the exact purchase option, billing period, and terms before you confirm.
Why Premium? Premium supports expanded planning features while keeping download and subscription management inside Apple’s familiar App Store purchase flow.
See Decide For Us on the App StoreNo surprise website checkout: Modern Methods does not sell either subscription directly on this site. Microsoft and Apple show the final current price and billing terms before purchase.
Last reviewed: August 31, 2026.