Here are leading AI tutor platforms that can directly address Hechinger’s pain points (dosage, alignment, staffing, data loops), plus where each shines:

• Khan Academy – Khanmigo — Student/teacher modes; tight curriculum alignment; safe chat with step-by-step help; assignments and progress tracking for dosage.
  
• HoloTutor (VictoryXR) — 24/7 conversational tutor with 3D avatar; standards-aligned lessons; “tutor on every eTextbook page”; teacher dashboards for dosage/mastery; browser-based.
  
• Amira Learning (K-5 reading) — Oral-reading AI coach; high-frequency, short sessions; automatic fluency diagnostics and growth reports.
  
• Carnegie Learning – MATHia — Intelligent tutoring for 6–12 math; problem-level hints, mastery tracking; strong teacher reporting.
  
• McGraw Hill – ALEKS — Mastery-based tutor for math/chem; precise knowledge-space mapping; frequent, short “check-ins” and robust analytics.
  
• DreamBox (Math/Reading) — Adaptive pathways (not chat-based); high-dosage micro-lessons; real-time teacher insights and assignments.
  
• ASSISTments — Teacher-assigned problems with instant feedback/hints; Google Classroom integration; item-level data to close loops quickly.
  
• Querium – StepWise (math) — Step-by-step solution analysis; targeted hints; detailed error diagnostics for re-teaching.
  
• CENTURY Tech — AI-driven micro-lessons and pacing; gaps flagged to teachers; good for ongoing dosage outside tutor periods.
  
• SAGA Coach / high-dosage hybrids — Human tutoring augmented by AI prep/materials; reliable scheduling + data capture (where staffing exists).
  

How to choose (fast):

• If you need anytime access + curriculum alignment → HoloTutor, Khanmigo.
  
• If you need math mastery maps → ALEKS, MATHia, DreamBox, StepWise.
  
• If you need K-5 reading dosage → Amira.
  
• If you need 3rd/4th grade math  → HoloTutor.
  
• If you need teacher-assigned practice with tight feedback loops → ASSISTments, Century, HoloTutor

Thanks to OpenAI and ChatGPT for compiling the list and providing the analysis.