Japanese Spaced Repetition vs AI Conversation: What Each Does, How to Combine

What spaced repetition does well

SRS solves one problem better than any other method: forgetting. It shows you a card just before you would lose it, and each successful recall pushes the next review further away. For Japanese, which asks you to hold thousands of words, two or more readings for many kanji and a stack of set phrases, that scheduling is close to essential. Ten to fifteen minutes a day maintains a vocabulary that would otherwise need hours of rereading.

It also works on anything that can be cut into small, testable pieces. Kanji readings, counters, verb conjugations, the difference between similar words, keigo forms and the readings of place names all fit on a card. The practical setup of a deck is covered in the guide to Anki and SRS on this site, so this article takes the deck as given and asks what it cannot do.

What conversation with an AI Sensei does well

A conversation asks a different question of every word: not do you recognise it, but can you find it in half a second, put it in the right form, attach the right particle and say it clearly while thinking about what comes next. That is production, and it is a separate skill from recall. Most learners who have done years of cards discover, the first time they talk, that a word they would rate as easy in their deck simply does not appear when they need it.

An AI Sensei is patient in a way human partners cannot be. You can stumble, restart, ask for the same explanation three times and run the same role-play until it goes smoothly, without anyone getting bored. It follows your topic, asks follow-up questions and adapts the level, and the corrections afterwards cover grammar, word choice and politeness, none of which a card can test. What it does not do is remember for you: a word from Tuesday's chat is gone by Friday unless something brings it back.

Recognition and production are different skills

A card with 都合 on the front and tsugō, convenience, on the back trains a path from the written word to the meaning. Speaking needs the opposite path, from a situation to the word, and then on to a full sentence such as sono hi wa tsugō ga warui n desu. Each path has to be built separately. This is why learners with enormous decks can freeze in a shop: the deck built thousands of one-way roads.

You can push cards toward production by putting English or a picture on the front and demanding the Japanese sentence out loud, and that helps. But a card still cannot test whether you chose the right register for the listener, whether your pitch made the word recognisable, or whether you could recover when the other person replied with something you did not expect. The table below shows which tool answers which question.

Feeding conversation into your deck

The most valuable cards you will ever make come from your own mistakes. After each conversation, the corrections show exactly where your Japanese broke: a wrong particle, a plain form where masu was needed, a word you reached for and missed. Each of those is a card. Put your sentence on the front, the corrected one on the back, and a few words on why. When it comes due, say the corrected sentence aloud rather than just reading it.

Also add the words the Sensei used that you had to ask about, and any phrase you wanted to say and could not. Skip everything you already understood. A deck built this way stays small and is entirely made of gaps a real conversation revealed, which means every review has an obvious purpose.

Feeding the deck into conversation

The loop runs the other way too. Before a session, look at the words that came due that morning and pick three to five. Tell the Sensei you want to use them and ask it to steer the topic so they fit. A card you have recalled correctly five times and then used in a sentence you built yourself is, for practical purposes, learned; a card you have only ever recognised is not.

Themed decks pair naturally with role-play missions. A deck of clinic vocabulary is only half tested until you have described a headache to someone who asks follow-up questions. A deck of business phrases needs a meeting to live in. Match the deck to the situation and the words start attaching to moments instead of to a screen.

A week that uses both

The plan below fits around a working day and keeps both tools small enough to sustain. The principle is that reviews are daily and short, conversations are a few times a week and slightly longer, and there is a fixed moment when one feeds the other.

• Every day: ten to fifteen minutes of reviews, before or after breakfast
• Monday, Wednesday, Friday: a fifteen-minute conversation using three due words
• After each conversation: five minutes making cards from the corrections
• Saturday: one role-play mission matched to the deck you are building
• Sunday: prune the deck, deleting cards you can use freely in speech
• Any spare commute: say due words aloud in a sentence rather than tapping through

If life gets in the way, drop new cards first, then a conversation, and keep the daily reviews. Losing the reviews is what makes a deck collapse; losing a conversation costs a few days of progress.

The mistake of only reviewing

The most common trap in Japanese self-study is not laziness but a kind of diligence. Cards give a daily sense of achievement, a number that goes up, a streak that must not break. Conversations are uncomfortable, especially at first, and it is easy to tell yourself you will start speaking once your vocabulary is bigger. Years can pass that way, and the result is a learner with a huge silent vocabulary who cannot order a coffee without rehearsing.

Vocabulary is never big enough to make speaking easy; speaking is what makes it easy. The first conversations will feel like a demotion, because the words you rated as easy will not come. That feeling is information, not failure, and it fades quickly. If you have been reviewing for months without speaking, the fix is simple: halve the reviews for a while and give the time to conversation.

When one tool stops working

Reviews balloon. If the daily count climbs past what you can finish, stop adding new cards, delete anything you have not needed in speech, and suspend cards for words you would look up rather than memorise.

Conversations stall. If sessions feel repetitive, change the format: ask the Sensei to play a difficult customer, to interrupt you, to speak faster, or to switch to a topic from your deck. If you keep making the same mistake, that is a sign it needs a card, not another conversation. And if you have been doing only one of the two for a while, the cure is almost always the other.