#257D8A
Closest named color: Ocean (#017B92). oklch(54.5% 0.082 209.3), rgb(37, 125, 138).
Aa
White text reads best on this color (4.79:1).
About this color
#257D8A is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 54%, its chroma 0.082 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean (#017B92), ΔE 0.019 away. White text reads best on it, at 4.79:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Ocean (#017B92) |
| Black text | 4.37:1 |
| White text | 4.79:1 |
Values
| HEX | #257D8A |
| RGB | rgb(37, 125, 138) |
| HSL | hsl(188, 58%, 34%) |
| OKLCH | oklch(54.5% 0.082 209.3) |
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 #257D8A | 4.79:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #257D8A | 4.37:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #257D8A text on white | 4.79:1 | AA | Lc 73.0 | Content text, not long reading |
| #257D8A text on black | 4.37:1 | AA large text | Lc -28.7 | Dividers and decoration only |
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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#CADDE0
oklch(88.4% 0.021 208.1)
-
Step 300
300
#A6C8CE
oklch(81% 0.037 209.5)
-
Step 400
400
#74ABB5
oklch(70.7% 0.059 210.1)
-
Step 500
500
#4C96A2
oklch(63% 0.076 209.2)
-
Step 600
600 (this color)
#257D8A
oklch(54.5% 0.082 209.3)
-
Step 700
700
#1A6C78
oklch(49% 0.077 209.6)
-
Step 800
800
#1A5862
oklch(42.6% 0.063 210.3)
-
Step 900
900
#1D4950
oklch(37.8% 0.049 209.3)
-
Step 950
950
#122B2F
oklch(27.1% 0.032 209)
#257D8A 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) | #71788B | 0.078 |
| Deuteranopia (no green cones) | #636E8A | 0.071 |
| Tritanopia (no blue cones) | #008381 | 0.029 |
| Achromatopsia (no color) | #727272 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257D8A
#257D8A
oklch(54.5% 0.082 209.3)
- #9A5D54
#9A5D54
oklch(54.4% 0.082 29)
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 #257D8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean #017B92 ΔE 0.019
- Teal #008080 ΔE 0.024
- Deep Aqua #08787F ΔE 0.025
- Bluegreen #017A79 ΔE 0.032
- Teal Blue #01889F ΔE 0.039
- Sea Blue #047495 ΔE 0.040
- Dark Cyan #008B8B ΔE 0.042
- Cerulean #457B9D ΔE 0.043
Use #257D8A 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.