んだってI heard that, He or She said that

The phrase ときいた tends to be used when the speaker is sharing information they got from another source, highlighting the secondhand nature of the info, while んだって tends to be used to indicate something the speaker has heard, with more emphasis on the fact that they personally heard it. The former also sounds more formal and neutral, while the latter is more informal and emotional, often used in casual speech, gossip, or hearsay.

"んだって" generally carries a sense of surprise or uncertainty, and is often used to convey hearsay or to express that one has heard about something. On the other hand, "って" is a more general and casual way to quote someone's words or thoughts. It can also be used to change the subject of a conversation. While both can be used in casual speech, "んだって" carries a stronger emotional nuance.

んだって typically indicates that the speaker has heard a piece of information from someone else, and is conveying it as indirect hearsay. It usually carries an undertone of surprise or doubt from the speaker. On the other hand, とか is a more casual, inexact way of conveying something one heard or a possibility, often used to list examples or non-specifics in informal conversation. It may also suggest the speaker's disinterest or lack of confidence in the accuracy of the information.

んだって and らしい have similar uses as they both communicate secondhand information. However, んだって is more casual and directly indicates that the speaker heard the information from someone else, often used when quoting someone's words. On the other hand, らしい is a bit more formal and expresses the speaker's conjecture or assumption based on what they heard, seen, or read, not necessarily directly quoting someone.

While both んだって and そうだ mean 'I heard that', they are used differently based on the context and the source of the information. んだって conveys a sense of direct speech, as if you heard the information directly from the person who originally said it or is most closely involved. On the other hand, そうだ has a nuance of indirect speech or general hearsay, where the information has been passed down through different sources or it is generally known within a community.

The expression んだって is commonly used to provide information the speaker has heard from someone else, which can be translated as "I've heard that" or "he/she said that." On the other hand, だって has more diverse usages. It can indicate reason or cause when it can be translated as "because," introduce a contradictory statement or recount information, equivalent to "but" or "I heard/was said", or express emphasis or inclusivity translating to "also" or "even."