Your wellness routine, rebuilt around conversation.
CheckApp works by having DIDI — your AI health companion — proactively check in throughout the day, analyze tongue photos for hydration, and respond to short video messages with personalised wellness guidance.
The Daily DIDI Routine
DIDI's conversations are different every day
DIDI is a reasoning model, not a static script. Each morning it reads your check-in history, hydration trends, and mood to craft a completely fresh conversation — new questions, different photo requests, varied tasks. No two days are the same.
Morning check-in
DIDI asks how you feel + water status — with a different question every day.
⚡ Midday check
You've only hit 28% of your water goal. DIDI noticed.
28% of daily goal
Midday nudge
DIDI notices if you've had less than 30% of your daily water goal and gently follows up.
Scan Result
Moderately hydrated. One more glass before dinner.
Tongue scan
Available on demand — DIDI signals when a check makes sense based on your patterns.
Today's Summary
3/3 ✓
Check-ins
74% ✓
Hydration
5 days 🔥
Streak
Good ✓
Mood
Evening summary
DIDI wraps up the day — what went well, what to focus on tomorrow.
Tongue Scan Technology
Mild dehydration affects 75% of adults at some point during the day. A tongue scan gives you a quick, at-home signal before symptoms escalate.
Open camera in app
Tap the check-in button and select tongue scan.
Take photo in good light
Natural light works best. Hold steady for 2 seconds.
AI analyzes your tongue
Color, coating, moisture → hydration level in seconds.
Disclaimer: DIDI is not a medical device. Results are for personal wellness guidance only. Consult a doctor for medical concerns.
Short Video Messages to DIDI
Record a short video message for DIDI — show your tongue, describe how you feel, or just check in visually. DIDI watches and responds with context-aware feedback. Like voice messages, but for your health.
The Science Behind It
Dehydration & cognitive performance
Mild dehydration of 1-2% body weight impairs cognitive performance by up to 13%.
Journal of Nutrition, 2024 →Tongue diagnosis in medicine
Tongue appearance has been used in traditional and modern medicine as a hydration indicator.
NIH / PubMed →Habit formation through conversation
Conversational interfaces increase habit adherence compared to passive tracking alone.
Behavioral Science Research →Your health deserves a friend, not a dashboard.
Start free. No credit card. DIDI is waiting for you.