#258CA8
Closest named color: Blue NCS (#118AB2). oklch(59.6% 0.099 220.7), rgb(37, 140, 168).
Aa
Black text reads best on this color (5.39:1).
About this color
#258CA8 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 60%, its chroma 0.099 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.019 away. Black text reads best on it, at 5.39:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.39:1 |
| White text | 3.89:1 |
Values
| HEX | #258CA8 |
| RGB | rgb(37, 140, 168) |
| HSL | hsl(193, 64%, 40%) |
| OKLCH | oklch(59.6% 0.099 220.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #258CA8 | 3.89:1 | AA large text | Lc -71.5 | Content text, not long reading |
| Black text on #258CA8 | 5.39:1 | AA | Lc 38.1 | Non-text elements, placeholder text |
| #258CA8 text on white | 3.89:1 | AA large text | Lc 66.0 | Content text, not long reading |
| #258CA8 text on black | 5.39:1 | AA | Lc -35.7 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E0ECF0
oklch(93.5% 0.014 219.6)
-
Step 200
200
#C7DEE6
oklch(88.6% 0.027 220.7)
-
Step 300
300
#9FC8D7
oklch(80.8% 0.048 222.2)
-
Step 400
400
#67ACC2
oklch(70.7% 0.077 220.4)
-
Step 500
500 (this color)
#258CA8
oklch(59.6% 0.099 220.7)
-
Step 600
600
#00809D
oklch(55.6% 0.102 221.1)
-
Step 700
700
#006C84
oklch(49.2% 0.09 220.2)
-
Step 800
800
#00586D
oklch(42.6% 0.078 221.3)
-
Step 900
900
#0B4959
oklch(37.7% 0.064 220.3)
-
Step 950
950
#0B2B34
oklch(27% 0.04 219.8)
#258CA8 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #7B88A9 | 0.081 |
| Deuteranopia (no green cones) | #6A7CA8 | 0.072 |
| Tritanopia (no blue cones) | #009595 | 0.047 |
| Achromatopsia (no color) | #818181 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #258CA8
#258CA8
oklch(59.6% 0.099 220.7)
- #B16A50
#B16A50
oklch(59.7% 0.099 40.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #258CA8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.019
- Teal Blue #01889F ΔE 0.021
- Teal Green #0A9396 ΔE 0.041
- Steel Blue #4682B4 ΔE 0.044
- Off Blue #5684AE ΔE 0.044
- Dusty Blue #5A86AD ΔE 0.045
- Cool Blue #4984B8 ΔE 0.046
- Dark Cyan #008B8B ΔE 0.048
Use #258CA8 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.