SelfTwin by IshvaLang

Your agent runs entirely in this browser, on this device — your words never leave it, and it works offline. It lives alongside your journal on its own memory (what you teach it) — not fused with your archive.

Ask your agent — exact arithmetic & number theory (+ − × ÷ ^ % √ ! gcd lcm nCr nPr, mod-power, primality — each derived & verified), your own facts, or an honest “I don't know” for what isn't a derivable result

Write in your own language, any script. It learns each word and keeps its meaning from how you use it — never English, never invented. Tap an underlined word to see its meaning in your own words.

Show it your writing — it reads

Point your camera at any writing — a journal page, a note, a whiteboard, a number — or pick a photo. It reads the text on your device (nothing leaves your phone), drops it into your entry for you to check, and it becomes part of your book. Seeing here is a way of listening — it reads what you show it, it never judges you. First use unpacks the on-device reader (~17 MB, once); after that it reads offline. Printed text reads best.

Its physical sense — let it feel motion

Give it your phone's motion sensors (one permission). It watches the real motion on its own and reverse-engineers what it can — gravity when still, your rhythm when you move it — and says plainly when there's no law. Everything it does is journalled below for you to check. (It only reads motion; it can't touch anything else on your phone.)

Let it read you — by the physics of your motion

Hold the phone and move as you naturally do. It applies frequency analysis and motion-physics to learn the signature of how your body moves — your rhythm, your steadiness — then can tell whether new motion resembles you. (It reads the physics of your movement, not your mind — and it can't prove it's only you, just that motion matches the you it learned.)

Read my pulse (a real rhythm of you — not your brain)

Rest a fingertip gently over the rear camera, hold still ~15s in good light. It reads your heartbeat from the light through your skin (photoplethysmography). It cannot read your brain — no phone can — but this is a true frequency of your body.

Read my breathing from motion (phone flat on your belly)

Lie down, rest the phone on your chest, hold still ~30s. From the tiny motions alone it decodes your breathing and heartbeat — both below 20 Hz, sub-perceptual — and only reports a rate it can verify on a held-out half. If the signal is too weak, it honestly declines rather than guessing.

Your wellness trend over time — Pro

Every verified reading above is saved on your device (declined ones are never stored). Pro turns single readings into your resting-rate and breathing trend over days and weeks — computed on your phone — your readings never leave it.

Read my will (the agent's plausible mind)

Type a few things on your mind, or paste recent notes (one per line). The agent infers what you mean — your preoccupation, your intent, the undercurrent — holds it with honest confidence, and asks if it read you right. It learns from your answer. This is its plausible half: it never claims certainty, and you are the judge.

How I've learned you (Pro)

Watch the read become yours: your confirmed "that's me", the words you've confirmed are you, and the corrections I've absorbed. It only exists from your own yes/no — and it grows the more you use it.

Self-improvement · introspection (Pro)

The twin looks inward — honestly. It names its own weaknesses (each with the evidence, never flattered) and how it would grow; and from your words above it reflects your patterns back — descriptively, never advice. Two sides of the shared self.

Find the hidden rule in numbers

Paste a sequence (15+ numbers). The agent guesses the law and proves it on numbers it never saw.

Find a law in your data

Paste real measured pairs — x values, then the matching y values. It fits the simplest law, learns from most of them, and tests on the rest. If it holds on points it never saw, it keeps it; if not, it refuses to invent one.

Prove or refute

Everything it can do

⚠ Save your Recovery Key