#257B5D
Closest named color: Bluegreen (#017A79). oklch(52.4% 0.094 165.7), rgb(37, 123, 93).
Aa
White text reads best on this color (5.15:1).
About this color
#257B5D is a medium-dark, moderately saturated green. In OKLCH its lightness is 52%, its chroma 0.094 and its hue 166°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Bluegreen (#017A79), ΔE 0.045 away. White text reads best on it, at 5.15:1.
| Hue family | Greens |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.094) |
| Temperature | in between |
| Nearest name | Bluegreen (#017A79) |
| Black text | 4.06:1 |
| White text | 5.15:1 |
Values
| HEX | #257B5D |
| RGB | rgb(37, 123, 93) |
| HSL | hsl(159, 54%, 31%) |
| OKLCH | oklch(52.4% 0.094 165.7) |
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 #257B5D | 5.15:1 | AA | Lc -80.6 | Fine for body text |
| Black text on #257B5D | 4.06:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #257B5D text on white | 5.15:1 | AA | Lc 75.2 | Fine for body text |
| #257B5D text on black | 4.06:1 | AA large text | Lc -26.5 | 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
#F2F7F4
oklch(97.2% 0.007 160.1)
-
Step 100
100
#E3EDE8
oklch(93.7% 0.013 164.8)
-
Step 200
200
#CBDED5
oklch(88.4% 0.024 165.8)
-
Step 300
300
#A8CABA
oklch(81% 0.043 165.2)
-
Step 400
400
#77AE97
oklch(70.6% 0.067 166.5)
-
Step 500
500
#519A7D
oklch(63% 0.086 165.8)
-
Step 600
600 (this color)
#257B5D
oklch(52.4% 0.094 165.7)
-
Step 700
700
#227055
oklch(49% 0.087 166)
-
Step 800
800
#1F5B45
oklch(42.6% 0.072 165.5)
-
Step 900
900
#204B3A
oklch(37.7% 0.057 165.2)
-
Step 950
950
#142C22
oklch(27% 0.036 165)
#257B5D 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) | #78725B | 0.093 |
| Deuteranopia (no green cones) | #6D6A5F | 0.090 |
| Tritanopia (no blue cones) | #007B73 | 0.034 |
| Achromatopsia (no color) | #6D6D6D | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257B5D
#257B5D
oklch(52.4% 0.094 165.7)
- #905276
#905276
oklch(52.2% 0.095 345.1)
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 #257B5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bluegreen #017A79 ΔE 0.045
- Dark Aquamarine #017371 ΔE 0.048
- Jungle Green #048243 ΔE 0.051
- Teal #008080 ΔE 0.051
- Deep Turquoise #017374 ΔE 0.052
- Sea Green #2E8B57 ΔE 0.055
- Deep Aqua #08787F ΔE 0.057
- Dark Sage #598556 ΔE 0.060
Use #257B5D 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.