Ladeappen, i motsetning til ladebrikken, viser ladekurven.

The -en ending is the usual definite ending for many masculine nouns in Norwegian.

So:

• en app → appen = the app
• en brikke → brikken = the tag/token/chip
• en kurve → kurven = the curve

In this sentence, all three nouns are definite:

• ladeappen = the charging app
• ladebrikken = the charging tag/fob
• ladekurven = the charging curve

Norwegian often puts definiteness at the end of the noun instead of using a separate word like the.

Norwegian regularly forms compound nouns by writing them as a single word.

Here:

• lade + app → ladeapp = charging app
• lade + brikke → ladebrikke = charging tag/fob
• lade + kurve → ladekurve = charging curve

Then the definite ending is added:

• ladeapp → ladeappen
• ladebrikke → ladebrikken
• ladekurve → ladekurven

This is very common in Norwegian. English sometimes writes these as two words, but Norwegian usually joins them.

I motsetning til means in contrast to, unlike, or as opposed to.

So:

• Ladeappen, i motsetning til ladebrikken, viser ladekurven.

means that the app does this, but the charging tag does not.

It is a fixed expression:

• i = in
• motsetning = contrast/opposition
• til = to

You usually learn it as one chunk: i motsetning til.

Because it is an inserted contrast phrase, almost like a parenthetical comment.

The basic sentence is:

• Ladeappen viser ladekurven.
• The charging app shows the charging curve.

Then Norwegian inserts extra information:

• i motsetning til ladebrikken
• unlike the charging tag

So the commas mark that inserted phrase:

• Ladeappen, i motsetning til ladebrikken, viser ladekurven.

In English, you can also do this with commas:

• The charging app, unlike the charging tag, shows the charging curve.

Because i motsetning til ladebrikken is inserted into the sentence before the verb.

Without the inserted phrase:

• Ladeappen viser ladekurven.

With the inserted phrase:

• Ladeappen, i motsetning til ladebrikken, viser ladekurven.

The real sentence structure is still:

• subject: Ladeappen
• verb: viser
• object: ladekurven

The contrast phrase interrupts the flow, but it does not change the main grammatical roles.

Viser is the present tense of å vise = to show.

Examples:

• Jeg viser = I show
• Du viser = you show
• Appen viser = the app shows

Norwegian verbs do not change according to person the way English sometimes does. So the same form viser is used with different subjects in the present tense.

Using ladekurven makes it sound like a specific charging curve, probably the one relevant in this context, such as the curve for the current charging session.

• viser ladekurven = shows the charging curve
• viser en ladekurve = shows a charging curve

If you said en ladekurve, it would sound more general or less specific.

Norwegian often uses the definite form when both speaker and listener understand which thing is meant from the situation.

Yes, ladebrikke is a normal kind of Norwegian compound.

A brikke can mean a small piece, chip, tag, token, or fob, depending on context. In charging contexts, ladebrikke often refers to a physical RFID tag or key-fob used to start charging.

So the contrast is between:

• ladeappen = the app on your phone
• ladebrikken = the physical charging tag/fob

Yes. The simpler version is:

• Ladeappen viser ladekurven.

That just says:

• The charging app shows the charging curve.

Adding i motsetning til ladebrikken gives extra contrast:

• the app shows it
• the charging tag does not

So the longer sentence is more informative, not grammatically more basic.

Yes, i motsetning til is a very common and natural way to express contrast.

Other possibilities exist depending on style, but this one is standard and clear.

For example:

• I motsetning til bilen er sykkelen billig.

  • Unlike the car, the bike is cheap.

• Appen fungerer, i motsetning til nettsiden.

  • The app works, unlike the website.

So in your sentence, it is a very natural choice.