The honest one-liner
Noom is the right call if you want a behavior-change course attached to a tracker. CalorieScan AI is the right call if you want a great tracker without paying for a course.
About Noom
Noom positions itself as a behavior-change program with a tracker attached, sold as a multi-month subscription.
Pricing: Noom: ~$60/mo or $209/yr. CalorieScan AI: free tier, Premium $9.99/mo.
Platforms: Noom: iOS, Android, web. CalorieScan AI: iOS only.