З одного боку, передплата зручна, з іншого боку, контракт дорогий.

Yes. It is a very common fixed expression.

Literally, з одного боку means from one side and з іншого боку means from the other side. Idiomatically, though, the whole pair means on the one hand ... on the other hand.

So Ukrainian is using a physical image of sides to express two contrasting points.

Because the preposition з here means from, and in this meaning it takes the genitive case.

The base noun is бік = side.
Its genitive singular form is боку.

The adjectives have to match that noun in case, number, and gender:

• один → одного
• інший → іншого
• бік → боку

So:

• з одного боку
• з іншого боку

are both genitive constructions.

Because the adjectives must agree with the nouns they describe.

• передплата is feminine singular, so the adjective is зручна
• контракт is masculine singular, so the adjective is дорогий

This is standard adjective agreement in Ukrainian.

So the pattern is:

• feminine noun → feminine adjective
• masculine noun → masculine adjective
• neuter noun → neuter adjective
• plural noun → plural adjective

In Ukrainian, the verb to be is usually omitted in the present tense.

So:

• передплата зручна = the subscription/prepaid plan is convenient
• контракт дорогий = the contract is expensive

This is completely normal Ukrainian.

You can sometimes see є, but in simple present-tense statements it is often unnecessary and can sound more marked or formal. The zero-copula structure is the default.

It depends on context.

Передплата can mean:

• subscription
• prepayment
• prepaid service/plan

In this sentence, if the topic is something like mobile phone service, передплата very likely means a prepaid plan rather than a long-term contract.

So a learner should not assume it always means only subscription in the English sense. The context decides.

The commas help mark the contrast structure.

In З одного боку, ..., з іншого боку, ..., both introductory phrases are set off with commas:

• З одного боку,
• з іншого боку,

There is also a comma separating the two contrasted parts of the sentence.

So the punctuation reflects the balancing structure: one point on one side, another point on the other side.

Yes, but the nuance is a little different.

For example:

Передплата зручна, але контракт дорогий.

This means The prepaid plan/subscription is convenient, but the contract is expensive.

That is perfectly grammatical, but з одного боку ... з іншого боку ... sounds more like weighing two sides of an issue. It is more balanced and argumentative, while але is just a straightforward but.

Yes. Ukrainian word order is fairly flexible.

This sentence uses a very natural, neutral order:

З одного боку, передплата зручна, з іншого боку, контракт дорогий.

But Ukrainian can move things around for emphasis. For example, the noun could come earlier in some contexts. Still, the expression з одного боку and з іншого боку usually stays together as a unit.

So the exact order can shift, but the given version is a normal and natural one.

З, із, and зі are pronunciation variants of the same preposition.

Ukrainian chooses among them mainly for ease of pronunciation and sound flow.

Here, з одного боку sounds natural, so з is used. In other contexts, you may see із or зі to avoid awkward consonant clusters.

So this is mostly about euphony, not a change in meaning.

They are close, but not always identical in usage.

• договір is a broad, general word for agreement/contract
• контракт often sounds more specific, formal, or tied to certain real-world situations such as employment, business, or service plans

In a sentence about prepaid service versus a contract plan, контракт sounds very natural.

So a learner should recognize that both can mean contract, but the preferred word depends on context.

Because Ukrainian has no articles.

A noun like контракт can mean:

• a contract
• the contract

depending on context.

The same is true for передплата.

English speakers often look for article meaning in the Ukrainian word itself, but Ukrainian usually leaves that to context, word order, and the situation being discussed.