Complemented By Or With | Usage Rules And Real Examples

You’ve seen it: a meal “complemented by” a sauce, a course “complemented with” worksheets, a design “complemented by” spacing. Both prepositions show up in writing, so it’s easy to second-guess yourself.

Pick your angle. Are you pointing to the piece that makes the main item feel complete? Or are you listing what comes alongside it? Once that’s clear, the wording falls into place.

Complemented By Vs Complemented With At A Glance

Pattern	What It Signals	Sentence You Can Copy
is complemented by + noun	Y completes X	The lesson is complemented by short quizzes.
was complemented by + phrase	A finishing part strengthens the main part	The talk was complemented by a quick demo.
is complemented with + noun	X comes with Y as an add-on	The course is complemented with printable worksheets.
are complemented with + materials	Extra items were included	The slides are complemented with speaker notes.
complements + object	Active voice: Y completes X	Practice drills complement the lecture.
complement each other	Two things pair well both ways	Clear headings and short paragraphs complement each other.
a complement to + noun	Noun form: a matching add-on	The checklist is a handy complement to the article.
complement vs compliment	Spelling check: complete vs praise	“Nice work” is a compliment; “a side dish” can be a complement.

Complemented By Or With In Plain English

Complement means “complete” or “go well with.” The Cambridge Dictionary definition of “complement” shows this sense clearly.

Two small details cause the confusion:

• Preposition choice:by often points to what does the completing, while with often points to what was added.
• Spelling twin:compliment means praise. If you mean praise, you want “complimented,” not “complemented.”

When you see complemented by or with in a sentence, pause and ask one question: are you naming the completing part, or listing the added part?

Complement Vs Compliment In One Line

If you can swap in “praise,” you want compliment. If you mean “match” or “complete,” you want complement. Merriam-Webster lays out the difference in its complement vs. compliment note.

Complemented By: When The Second Part Completes The First

Complemented by works well when the second element feels like the reason the first element lands well.

Easy Way To Check “By”

Try rewriting into active voice. If “Y complements X” sounds natural, “X is complemented by Y” will usually read clean too.

• Active: Weekly quizzes complement the lesson.
• Passive: The lesson is complemented by weekly quizzes.

Sentences That Fit “Complemented By”

• The article is complemented by a checklist that makes the steps easy to scan.
• The simple layout is complemented by generous spacing.
• The main argument is complemented by clear citations and dates.
• The rich stew is complemented by a bright, acidic garnish.

When “By” Sounds Best

“By” tends to sound strongest in these situations:

• Features that strengthen: A main item plus something that makes it work better.
• Finishing touches: A small add-on that changes the feel of the whole.

Complemented With: When You’re Naming What Was Added

Complemented with often reads like “served with,” “packaged with,” or “comes with.” It’s useful when you’re listing what’s included, attached, or paired as a side item.

Sentences That Fit “Complemented With”

• The course is complemented with printable worksheets for each unit.
• The starter kit is complemented with a spare cable and a simple case.
• The dessert is complemented with fresh berries.

“With” Can Change The Spotlight

Compare the feel of these two lines:

• Completing detail: The guide is complemented by a checklist.
• Included item: The guide is complemented with a checklist.

If the checklist is the part that makes the guide feel finished, “by” often reads sharper. If you mean the checklist was bundled in, “with” can be the better match.

Picking The Right One In Common Situations

Teaching And Study Materials

In course writing, “by” often matches reinforcement. “With” often matches included downloads.

• The unit is complemented by quick checks for understanding.
• The unit is complemented with printable review sheets.

Food Writing

If you’re naming what’s on the plate together, “with” feels natural. If you’re naming the finishing touch that lifts the dish, “by” can read more deliberate.

• The grilled fish is complemented with lemon butter sauce.
• The grilled fish is complemented by a squeeze of lemon and fresh herbs.

Design And Layout Notes

When you’re naming a trait (spacing, contrast, typography), “by” often fits. When you’re listing what’s included in a theme pack, “with” can fit.

• The headline style is complemented by a calm body font.
• The theme is complemented with prebuilt page templates.

Common Mistakes And Clean Fixes

Most problems come from one of these patterns.

Mistake 1: Writing “Complimented” When You Mean “Complemented”

“Complimented” means someone praised something.

• She was complimented by her teacher on her essay.

If you mean “pairs well” or “completes,” switch the spelling.

• The essay is complemented by clear headings and tight examples.

Mistake 2: Using “With” For A Reaction

Some nouns are reactions, not pairings. “Applause” is a good one. Try a different verb.

• Better: Her speech was met with applause.

Mistake 3: Long Passive Chains

If a paragraph stacks three passive sentences, it can feel heavy. Flip one into active voice and keep the rest.

• Active: A short timeline complements the plan.

Quick Fix Table For Draft Sentences

Match your meaning, then borrow the structure.

Draft	Cleaner Version	Why It Reads Better
The lecture was complemented with a Q&A session.	The lecture was complemented by a Q&A session.	“By” frames the Q&A as what completes the lecture.
The bundle is complemented by a carrying case.	The bundle is complemented with a carrying case.	“With” fits when the case is included in the bundle.
The colors were complimented by the layout.	The colors were complemented by the layout.	Switch praise to pairing.
The soup was complemented by bread and butter.	The soup was complemented with bread and butter.	Sides often read like pairings.
The report is complemented with citations from journals.	The report is complemented by citations from journals.	Citations act like evidence that strengthens the report.
The plan is complemented with a timeline that guides action.	The plan is complemented by a timeline that guides action.	“By” makes the timeline the completing part.
The design is complemented with contrast.	The design is complemented by contrast.	Contrast is a design trait, not an item you add.
The reading list is complemented by worksheets.	The reading list is complemented with worksheets.	Use “with” if the worksheets are bundled as part of the list.

Editing Steps That Keep It Smooth

1. Say what the second part is doing: completing the first, or coming alongside it.
2. Try the active swap: “Y complements X” is the cleanest test sentence.
3. Check for reactions: if the noun is a reaction (applause, laughter, criticism), pick a verb like “met with” or “followed by.”
4. Read once out loud: if it sounds stiff, switch one line to active voice.

Mini Quiz To Lock In The Choice

Pick the option that matches the meaning. Then check the answers right below.

Quiz

1. The tutorial was complemented ___ a set of screenshots that made each step clear. (by / with)
2. The starter kit is complemented ___ two spare filters in the box. (by / with)
3. The calm background is complemented ___ a bold headline color. (by / with)
4. The meal was complemented ___ a side of rice and grilled vegetables. (by / with)
5. The lesson is complemented ___ weekly quizzes that reinforce the main ideas. (by / with)

Answers

1. by — the screenshots complete the tutorial.
2. with — the spares are included items.
3. by — the headline color shapes the design.
4. with — sides read like pairings.
5. by — the quizzes strengthen the lesson.

Final Takeaway

When you write complemented by or with, you’re making a small meaning choice. If you mean “this completes it,” lean on “by.” If you mean “this was added alongside,” lean on “with.”

When in doubt, go active: “Y complements X.” It’s short, clear, and it keeps your sentence moving.