The AI that remembers your life.
Not a chatbot. Not a productivity app. A personal AI companion that manages your diary, tasks, expenses, and wellness — entirely by voice. Private by design. Fluent in your language.
Voice-First Conversations
AI-Powered Personal Diary
Voice Expense Tracking
Smart Planner & Reminders
Wellness & Longevity ScoreStories & Video Reels
Prescription ScannerVoice Grocery ListsVoice-First ConversationsAI-Powered Personal DiaryVoice Expense TrackingSmart Planner & RemindersWellness & Longevity ScoreStories & Video ReelsPrescription ScannerVoice Grocery ListsReplace Your Entire App Drawer
Most people switch between a diary app, an expense tracker, a to-do list, a wellness app, a reminders app, and a voice assistant. Sathi handles all of it — from one conversation.
See how voice expense tracking works →|Built for students too →
Everything You Need. Just Speak.
VivaLyn Sathi replaces your diary app, task manager, expense tracker, and wellness journal with one voice-powered AI companion. No accounts to sync. No complex setup. Just speak naturally and let AI handle the rest.
Voice-First Conversations
Talk — don't type. Have real conversations in Hindi, English, or both mixed together. Ask questions, give instructions, share your day. Sathi gets what you mean, not just what you say.
Learn moreAI-Powered Personal Diary
End your day by talking. Sathi writes your journal — mood, key events, reflections — in beautiful handwritten-style format. A daily diary without the blank-page anxiety.
Learn moreVoice Expense Tracking
Say '200 rupees chai' — logged. Scan a bill — categorised. Sathi spots recurring expenses, flags spending anomalies, and shows you where your money actually goes. No spreadsheets.
Learn moreSmart Planner & Reminders
Create tasks by speaking. Sathi auto-categorises, learns your schedule, and reminds you at the right time. Supports workflows, grocery lists, and recurring routines too.
Learn moreWellness & Longevity Score
A 30-second voice check-in tracks mood, sleep, water, and exercise. Sathi builds a 7-dimension longevity score, spots patterns, and nudges you when something's off.
Learn moreStories & Video Reels
Turn your week into a shareable video story. Sathi picks highlights from your diary, adds mood-based music, and renders a reel you can post on Instagram or WhatsApp.
Learn morePrescription Scanner
Photograph a prescription. AI reads it, extracts every medicine, and creates scheduled reminders automatically. Works with Indian dosage formats — OD, BD, TDS, and more.
Learn moreVoice Grocery Lists
Say 'add doodh, anda, aur bread' — Sathi creates a categorised grocery list. Checks items off as you shop. Understands Hindi, English, and mixed-language item names.
Learn moreThree Steps. That's It.
No learning curve. No onboarding tutorials. Open the app, speak, and VivaLyn Sathi takes care of the rest.
Speak
Talk to VivaLyn Sathi in Hindi, English, or Hinglish. Say what's on your mind — share how your day went, mention an expense, ask it to remind you about something, or just have a conversation.
AI Understands
VivaLyn Sathi understands what you mean — not just what you say. It uses your conversation history, personal preferences, and life context to take the right action instantly.
Life Organized
Tasks created. Expenses logged. Diary written. Wellness tracked. Medication reminded. Everything captured and organised — without you ever touching the keyboard.
Five Modes. One AI.
Everyone uses AI differently. VivaLyn Sathi adapts with five distinct persona modes — each with its own personality, tone, and specialisation. Switch between them anytime based on what you need right now.
Saathi (Companion)
Your everyday AI friend — warm, conversational, and genuinely remembers your life. Perfect for daily catch-ups, diary dictation, and having someone who listens without judgement.
Best for: EveryonePlanner
Structured and precise. Creates tasks from your voice, organises schedules, sets smart reminders, and keeps your professional and personal life on track.
Best for: Working professionalsCoach
Motivational and goal-oriented. Tracks your wellness score, encourages consistent sleep and exercise habits, and celebrates your streaks and milestones.
Best for: Health-conscious usersFamily Care
Built for families caring for elderly parents. Medication reminders that never miss, fall detection without a wearable, voice-activated calling, and gentle social connection nudges.
Best for: Families & seniorsJournal
Reflective and thoughtful. Creates beautifully written diary entries from your daily conversations, tracks emotional patterns over weeks, and helps you understand yourself better.
Best for: Thinkers & writersYour Data Never Leaves Your Phone.
In a world where every app monetises your personal information, VivaLyn Sathi takes a radically different approach. Your diary entries, conversations, expenses, and wellness data all stay on your device. Privacy isn't a feature — it's the foundation.
On-Device Storage
Every diary entry, task, expense, and memory stays on your phone. Your data never uploads to any cloud server.
No Tracking, No Ads
No tracking pixels. No ad networks. No data brokers. VivaLyn Sathi makes money from the product, not from your data.
Encrypted by Default
All personal data — diary, tasks, expenses, wellness, memories — is encrypted on your device using industry-standard encryption.
Server Knows Nothing
Our server is a stateless proxy — it processes your voice and forgets. No names, no history, no profiles stored remotely.
Full Data Control
Delete everything with one tap. Export your data anytime. Your data, your choice, your control — always.
Privacy by Architecture
Privacy isn’t a settings toggle — it’s how VivaLyn Sathi is built. Local-first storage, ephemeral processing, zero server memory.
AI That Speaks Your Language — Literally.
VivaLyn Sathi works in 6 Indian languages — voice input, AI responses, and voice output. Mix Hindi and English in the same sentence. Switch languages mid-conversation. VivaLyn Sathi understands code-mixing the way real Indians speak.
Real People. Real Life.
From busy professionals managing packed schedules to senior citizens who prefer speaking over typing — VivaLyn Sathi is designed for people who want AI to fit into their daily life, not the other way around.
Neha, Product Manager
Age 28I used to forget half my tasks and gave up journaling every January. Now I just talk to Sathi on my commute — tasks get created, expenses get logged, and by bedtime there's a diary entry I didn't have to write. I haven't opened my notes app in three months.
“Mera pura din Sathi sambhal leta hai. I just speak and everything's handled.”
Ravi, Working Son
Age 34My parents are in Pune, I'm in Bangalore. Papa forgets his BP medicine sometimes. I set up Sathi on his phone — it reminds him in Hindi, tracks if he took it, and I get a nudge if he doesn't respond. The fall detection gives us peace of mind without making him wear a gadget.
“Papa ab apne aap medicine le lete hain. Sathi yaad dilata hai unko.”
Kamala Aunty, Retired Teacher
Age 67My grandson set this up for me. I just talk in Hindi — tell it about my day, ask it to remind me about the doctor visit, call my daughter. I don't understand apps but this one just listens. It even writes my diary — like I have a personal secretary.
“Bas boliye. Type karne ki zaroorat nahi. Ye meri baat samajhta hai.”
Arjun, College Student
Age 21I track every UPI spend by just saying the amount after each transaction. End of month, Sathi shows me exactly where my hostel budget went. The study planner keeps my assignments on track and the habit streaks actually make me drink water.
“200 rupees canteen — done. Sathi tracks it all, I don't touch a spreadsheet.”
Priya, Homemaker
Age 38Between school runs and cooking, I used to lose track of household expenses and grocery lists. Now I tell Sathi what I bought while cooking, and it builds the monthly expense report. I say 'grocery list banao' and it asks me what I need. My hands are always busy — voice is perfect.
“Haath busy rehte hain, lekin Sathi sab note kar leta hai.”
Care Beyond Convenience
VivaLyn Sathi goes beyond productivity. With built-in medication reminders, fall detection, and social connection monitoring, it watches over the people you love — especially elderly family members living independently.
Fall Detection Without a Wearable
Using your phone's built-in sensors, VivaLyn Sathi detects falls and gives a 10-second confirmation window. If there's no response, it automatically alerts family members. No smartwatch or wearable needed.
Medication Reminders
Add medications by voice — VivaLyn Sathi reminds at the right time with spoken alerts in Hindi or English. Track compliance easily and stay on top of daily doses without complex apps.
Social Connection & Voice Calling
VivaLyn Sathi notices when someone hasn't connected with family in a while and sends gentle reminders. Make calls by just saying a name — "call Mummy" — no dialling needed.
AI That Actually Remembers You
Most AI assistants forget everything after you close the app. Sathi uses a two-tier memory system — a fast short-term buffer and a persistent long-term store — so the more you talk, the better it understands your life.
Short-Term Memory
Holds the current conversation thread — your last 20 messages stay in context so Sathi can follow multi-turn requests naturally without repeating yourself.
Long-Term Memory
Key facts — your name, family members, food preferences, medication schedule, daily routines — are extracted and stored locally. Sathi remembers across sessions, every time you open the app.
Conversation History
Every conversation is timestamped and searchable. Ask "What did I tell you about the Goa trip?" and Sathi finds it — even weeks later.
All memory stays on your device. Nothing is sent to a server. Nothing is sold.
How Two-Tier Memory Works →
From the Blog
Voice Journaling: Why Speaking Your Thoughts Improves Mental Health
Research on how voice journaling reduces stress and improves emotional clarity.
SafetyFall Detection Without a Wearable — How Your Phone Keeps Seniors Safe
Phone-based fall detection using accelerometer data and emergency SMS.
ProductivityGamified Productivity for Students — XP, Streaks & Levels
How gamification turns daily tasks into a game that builds real consistency.
Ready to Meet the AI That Remembers Your Life?
Free to download. No subscriptions. No data sold. Private by design. Available on Android.
iOS coming. Join the waitlist to be notified.