だって

1. 1Introduces the speaker's excuse or justification in response to a question or reproach ("but…", "because…").Ex. 1
2. 2Opens the reason given in answer to a どうして or なんで question ("because…").Ex. 2

Mainly conversational, especially with family, friends, or people close to the speaker, though it can also open a politely worded reply. It is typical in answers to どうして or なんで questions and when defending oneself against blame. It often pairs with sentence-final もん or もの, which strengthens the self-justifying, sometimes childish or sulky tone. Unlike から, which attaches to the end of a reason clause, だって begins the reply.

• 1.
  ものN2「もの」 goes at the end of the sentence, attached after a reason clause (often as 「んだもの／もん」), while 「だって」 stands alone at the start of the sentence; the two are often used together. 「もの」 can also add a reason to support a previous judgment, but it has no 'even... also' usage.
• 2.
  ものだからN2Only the sentence-initial 「だって」 is similar, as both carry an excuse-making tone. 「ものだから」 attaches after a reason clause and is followed by the result, with a softer tone suitable for polite apologies or requests; 「だって」 starts a sentence on its own and sounds childish. They attach differently and cannot be directly swapped.
• 3.
  ものでN1「もので」 attaches after a reason clause to softly explain the cause of an undesirable outcome, with an apologetic nuance, and can be used with superiors; 「だって」 stands at the start of the sentence to make excuses and is casual spoken language. Only the excuse-making sense is similar to 「だって」, and they cannot directly replace each other.
• 4.
  からN5They are similar only when expressing a reason: 「から」 attaches after a reason clause with a neutral register usable in general situations, while 「だって」 stands alone at the start of the sentence to defend oneself, carrying a defiant or whiny tone in spoken language. They attach differently and cannot be directly replaced.
• 5.
  しN4They are similar only in giving reasons. 「だって」 stands at the start of the sentence to introduce a reason defending oneself; 「し」 attaches after plain form, 「だ」, or polite form, listing reasons and implying there is more than one, with the following clause usually being a judgment or decision. The two cannot be interchanged.

だって stands at the start of a reply to justify oneself. Sentence-final もの/もん adds the same excuse nuance at the end, and the two often co-occur. ものだから and もので link a reason clause to a result, with もので being somewhat more polite. から gives a neutral reason, and し lists one or more reasons among several.