Complementary Color Finder
Find the complement and split-complements of any color.
The matching colors appear below. Click any swatch to copy its hex.
How to use Complementary Color Finder
Enter a color and see its complement, split-complement and triadic partners with copyable hex codes.
Open Complementary Color Finder on toolpermarket and enter your values in the fields below.
In the Color field, pick the source color or type its hex. The complement sits exactly opposite on the wheel (hue + 180 degrees).
In the Hex field, the six-digit hex of the source color (with or without #). A valid hex entered here updates the color swatch before you run.
Press Find to compute the result. The output appears immediately below the form. You can change any input and run it again to compare results.
Read the result and use it as needed. If the number looks off, re-check your inputs and run it again — the math is deterministic, so the same entries always return the same answer.
Worked example. Enter #397AAC and press Find to see its complement (a warm orange) plus the two split-complements that flank it — four copyable hex codes.
Tips for accurate results.
Use the straight complement for the strongest possible contrast between two elements.
Split-complements are easier on the eye than a direct complement while still popping.
Copy by clicking a swatch; the value lands on your clipboard instantly.
When to use Complementary Color Finder. Finding a call-to-action color that stands out against a brand background. Designing charts or diagrams where two series must stay clearly distinct. Resolving a layout that feels flat by adding one opposite-hue accent.
When you actually reach for this
- Reach for this when you have one color and need its direct opposite to create contrast or a call-to-action accent.
- Use it for poster design, button styling, or any time two colors must visually fight for attention.
Where this tool stops being accurate
- A raw complement can be jarring at full saturation; most real designs desaturate one side.
- It gives one opposite, not a full working pair of neutrals — you still need a background and text color.
Frequently asked questions
What is the difference between complement and split-complement?
The complement is the single hue opposite your color on the wheel. The split-complement uses the two hues on either side of that opposite, which keeps the tension but reads as less jarring.
Are the returned colors exact?
They are computed from your input with standard HSL math and rounded to valid hex, so the hex you see is the exact value that will render.
Is my color uploaded?
No. The conversion runs entirely on your device; the hex you type is never sent to a server or saved.
My complementary pair looks like a warning sign, how do I soften it?
Drop the saturation on the background to about 30% and keep the accent vivid, or split-complement (use the two neighbors of the opposite) for less aggressive tension.
Is the complement the same in RGB and HSL?
The hue flips 180°, but the resulting RGB depends on the space. HSL complements look cleaner; converting through RGB can shift the perceived brightness slightly.