How to tell them apart
The key split is your evidence source. そうだ is a visual impression from what you see or feel right now (美味しそう), ようだ judges from overall circumstances or indirect signs (そのようです), and らしい relies on hearsay or what you heard/read (難しいらしい). Swapping them sounds odd: saying 美味しいらしい for food in front of you ignores your eyes, while 美味しそうだ for a rumor you cannot see overstates direct evidence.
- そうだ Use そうだ when you are guessing based on what you directly see or feel right now.
- ようだ Use ようだ when you infer from overall circumstances or indirect signs rather than direct appearance.
- らしい Use らしい when your judgment comes from something you heard, read, or otherwise learned indirectly.
| Grammar point | Meaning | JLPT level |
|---|---|---|
| そうだ souda | Appears to be; seems that way (used in replies) | N4 |
| ようだ youda | It appears that; resembling something | N3 |
| らしい rashii | It seems; apparently so | N4 |
そうだ souda
Appears to be; seems that way (used in replies)
そうだ works two ways in these examples: after a verb's te-form or plain form it means something seems likely, as in 分かってそうだ (he seems to understand). It also stands alone as a conversational reply, そうだね or そうだよ, agreeing with or confirming what was just said. The standalone use is casual spoken Japanese.
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これならいいはず。たぶん。おそらく。そうだといいな。
This should be okay. Probably. Possibly. At least I hope so.
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メアリーがそれをやったって、トムは分かってそうだよ。
It seems Tom knows that Mary did that.
ようだ youda
It appears that; resembling something
ようだ expresses the speaker's impression that something seems to be the case, based on observation. It follows plain-form verbs and い-adjectives, な-adjectives plus な, and nouns plus の. The tone is neutral and works in both spoken and written Japanese.
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彼女は家庭的なハンディキャップに苦しんでいるようだ。
She seems to be laboring under the family handicap.
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彼女は、彼が何を言っているのか理解できないようだ。
She doesn't seem to be able to catch on to what he is saying.
らしい rashii
It seems; apparently so
らしい expresses that something seems or is apparently true, often based on hearsay or indirect information. It attaches directly to the plain form of verbs and i-adjectives, to na-adjectives and nouns without a copula, and follows phrases like によると to mark the source of the information.
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ｉＰｏｄnanoは音質がいいらしい。
Apparently the iPod nano has good sound.
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夜は雨になるらしい。
It's supposed to rain at night.
そうだ and ようだ and らしい are JLPT N4–N3 grammar points that Japanese learners often mix up. This page compares all 3 side by side on meanings, usage and example sentences, so you can tell them apart.