Snap
Photograph a notebook page or a receipt, or type a quick note: “Sold 3 rice, 250 each. Marie owes 500.”
Kaye ou, ki konn kalkile.
Your shop notebook, now it reads itself.
Snap a page of your sales notebook. Gemini Nano reads it on your phone, checks the arithmetic and keeps your books, even with no signal. At the end of the month you have a clean record to show a lender.
- Works offline, syncs later
- Photos stay on the device
- Kreyòl, French, English, Spanish
≈ 2 billionpeople work in the informal economy (ILO)
Paperis where most market vendors keep their books, if they keep them
No recordmeans no microloan, and credit given to neighbours gets forgotten
How it works
From a notebook page to clean books in four steps.
Read on the device
Gemini Nano turns it into sales, costs, credit and payments, right on the device.
Check the math
Kaye checks every line and the page total. If the numbers don't add up, it asks you, and only then offers the cloud.
Sync and show
Firestore keeps it all offline and syncs when there's signal. The month record is ready to show a lender.
Hybrid inference with Firebase AI Logic
The device first. The cloud only when it should, with only what it needs.
Notebook photo
ONLY_ON_DEVICE with Gemini Nano. If it can't read the page or the numbers don't add up, Kaye asks before sending that one photo to the cloud.
Quick note, English or Spanish
ONLY_ON_DEVICE. The note never leaves the device.
Quick note, Kreyòl or French
ONLY_IN_CLOUD after customer names and phone numbers are replaced on the device (“C1 owes 500”). Names are put back on the device.
Month record
PREFER_ON_DEVICE or PREFER_IN_CLOUD by language, built from totals only.
No signal, no model
Offline rules in four languages understand “vann 3 diri 250 chak” instantly. Everything is saved and syncs later.
Leaves the device: nothingEvery result shows where the AI ran (inferenceSource), how long it took and why. Routing settings live in Remote Config, so they change without a new app build.
Built on Firebase
Six Firebase products, each doing real work.
AI Logic
Hybrid Gemini Nano + Gemini cloud, on Android and in Chrome.
Firestore offline
Your notebook lives on the device first and syncs when there's signal.
Authentication
Start with no account; save the notebook to an email later.
Remote Config
Cloud model, on-device languages and check tolerance, changed live.
Analytics
Counts where the AI ran and how fast. Never your lines.
App Check
Play Integrity on Android, reCAPTCHA Enterprise on the web.
Privacy, in plain words
Your money, your customers, your notebook.
- Photos stay on the device. One goes to the cloud only after you tap “Send this photo”.
- The AI never sees customer names in the cloud: they're replaced first and put back on the device.
- Only you can read your notebook. Firestore security rules lock every page to your account.
- No advice. Kaye keeps records. It never tells you to borrow, spend or invest.
For the #BuildHybridAI judges
Open Kaye and tap Try it now, no account to get your own private notebook with sample data. Or sign in with demo@petiht.com / KayeDemo509. Every name and number in the samples is invented.
On-device photo reading needs Chrome 138+ on desktop with the Prompt API and multimodal input enabled, or the Android app on a phone with Gemini Nano (AICore). Without a local model, Kaye asks before using the cloud.