#258AAB
Closest named color: Blue NCS (#118AB2). oklch(59.2% 0.101 225), rgb(37, 138, 171).
Aa
Black text reads best on this color (5.30:1).
About this color
#258AAB is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.101 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.012 away. Black text reads best on it, at 5.30:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.30:1 |
| White text | 3.96:1 |
Values
| HEX | #258AAB |
| RGB | rgb(37, 138, 171) |
| HSL | hsl(195, 64%, 41%) |
| OKLCH | oklch(59.2% 0.101 225) |
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 #258AAB | 3.96:1 | AA large text | Lc -72.1 | Content text, not long reading |
| Black text on #258AAB | 5.30:1 | AA | Lc 37.5 | Non-text elements, placeholder text |
| #258AAB text on white | 3.96:1 | AA large text | Lc 66.6 | Content text, not long reading |
| #258AAB text on black | 5.30:1 | AA | Lc -35.1 | 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 600.
-
Step 50
50
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C8DDE6
oklch(88.5% 0.026 225.3)
-
Step 300
300
#A2C7D7
oklch(80.8% 0.045 226)
-
Step 400
400
#6DABC3
oklch(70.8% 0.073 224.6)
-
Step 500
500
#4095B4
oklch(63.1% 0.093 225.3)
-
Step 600
600 (this color)
#258AAB
oklch(59.2% 0.101 225)
-
Step 700
700
#006B88
oklch(49.1% 0.093 224.9)
-
Step 800
800
#09576F
oklch(42.6% 0.078 225.6)
-
Step 900
900
#15485A
oklch(37.7% 0.061 225.6)
-
Step 950
950
#0E2A35
oklch(26.9% 0.039 226.8)
#258AAB 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) | #7887AD | 0.078 |
| Deuteranopia (no green cones) | #667AAB | 0.068 |
| Tritanopia (no blue cones) | #009495 | 0.053 |
| Achromatopsia (no color) | #808080 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #258AAB
#258AAB
oklch(59.2% 0.101 225)
- #AF6949
#AF6949
oklch(59.1% 0.101 44.9)
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 #258AAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.012
- Teal Blue #01889F ΔE 0.023
- Steel Blue #4682B4 ΔE 0.036
- Cool Blue #4984B8 ΔE 0.039
- Off Blue #5684AE ΔE 0.040
- Dusty Blue #5A86AD ΔE 0.042
- Cerulean #457B9D ΔE 0.045
- Stormy Blue #507B9C ΔE 0.049
Use #258AAB 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.