Take a photo of a sign, menu, manga panel, or screenshot. Gravity finds the Japanese you are exposed to, keeps the context, and turns it into exercises.
A manga panel with bold dialogue and several useful Japanese words.
Gravity keeps the loop short: capture Japanese, inspect the extracted words, and review them with the image still attached.
Point Gravity at a sign, a menu, a manga panel, or a screenshot. The capture becomes the source for what you learn, so your study list starts with language you actually encountered.
Open the annotated view, tap a text box, and Gravity shows the extracted words with readings and meanings while the original capture stays visible.
Saved words come back as detailed cards with the source image, intonation, an example sentence, and natural, high-quality audio attached. Spaced repetition keeps review timing on track.
set meal
厚切りカツのとんかつ定食
Thick-cut pork cutlet set meal.
bicycle
自転車を除く
Except bicycles.
friend
仲間が現れる
Friends will appear.
Gravity started from a simple belief: language learning should follow you into real life and feel effortless enough that your only job is learning, not building lessons, drills, and word lists that rarely match what you actually see in real life.
Our mission is to help more of the world become fluent in the language around them: not just textbook fluency, but the confidence to read the menu, follow the sign, understand the message, and feel at home in a place that once felt unfamiliar.
We're a team of polyglots and lifelong language learners who have lived abroad, moved through different cultures, and watched friends, family, and classmates run into the same wall. We hope Aio will help make that wall feel a little easier to climb.
Meet the teamMost of us have stitched together our own setup: a streak app, a dictionary, a deck, an AI chat. Here is how those stack up against doing it in one place.
| Capability | 
Gravity
| Duolingo | Yomitan + Anki | AI + Anki |
|---|---|---|---|---|
| Words come from your own life: a menu, a screenshot, a textbook | Yes | No | Partial | Partial |
| One tap from capture to a saved word | Yes | No | Partial | No |
| No manual card creation | Yes | Yes | No | No |
| The original moment stays attached to the word | Yes | No | No | No |
| Spaced repetition so words don't slip away | Yes | Partial | Yes | Yes |
| No setup needed | Yes | Yes | No | No |
| Made for your phone, in the moment | Yes | Yes | No | Partial |
Gravity is available on iOS and Android. Download the app and start turning real Japanese into review material.
The things we hear most often, in plain language. Missing one? Email [email protected] and we'll add it.
Gravity is available on the App Store for iOS and Google Play for Android.
We're scoping to Japanese at launch to make the early experience as polished as possible, with Chinese, Spanish, and French planned soon after. We also want to localize the app itself so non-English speakers can use Gravity too.
Anki is powerful but you build every card yourself if you want personalized decks. Duolingo gives you an over-gamified curriculum. Gravity sits in between: it learns from the moments you're already living - a sign, a menu, a conversation - and turns them into a personal deck that reviews itself on the right schedule.
Not necessarily - you can also pull from your photo library, including manga screenshots, a friend's texts, or anything saved. Photos are the main input for now, but we're building toward direct text selection, document import, and audio capture. The idea is to start from real life, not a flashcard deck.
Yes. Your photos, notes, and recordings are yours - stored encrypted, never sold, and never used to train models outside of improving your own learning.
There's a generous free trial so you can build a real habit before paying. A subscription gets you 150-300 photo captures a month and a lot more down the line. Final pricing lands closer to launch, but expect less than your daily Starbucks order, per month.
That's Aio - Gravity's honorary fourth teammate and our mascot. He's an axolotl, named after Jupiter's moon Io. He's a polyglot, and your companion throughout our app.
