#255B71
Closest named color: Petrol (#005F6A). oklch(44.5% 0.067 228), rgb(37, 91, 113).
Aa
White text reads best on this color (7.46:1).
About this color
#255B71 is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.067 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.026 away. White text reads best on it, at 7.46:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.81:1 |
| White text | 7.46:1 |
Values
| HEX | #255B71 |
| RGB | rgb(37, 91, 113) |
| HSL | hsl(197, 51%, 29%) |
| OKLCH | oklch(44.5% 0.067 228) |
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 #255B71 | 7.46:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #255B71 | 2.81:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #255B71 text on white | 7.46:1 | AAA | Lc 85.7 | Fine for body text |
| #255B71 text on black | 2.81:1 | Fails | Lc -16.3 | 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 800.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2EBF0
oklch(93.5% 0.012 231.7)
-
Step 200
200
#CBDCE5
oklch(88.4% 0.022 230.6)
-
Step 300
300
#A7C6D5
oklch(80.9% 0.04 228.7)
-
Step 400
400
#77A9C0
oklch(70.8% 0.063 228.3)
-
Step 500
500
#5193B0
oklch(63.1% 0.08 228.5)
-
Step 600
600
#317D9B
oklch(55.6% 0.087 227.7)
-
Step 700
700
#236985
oklch(49% 0.081 228.7)
-
Step 800
800 (this color)
#255B71
oklch(44.5% 0.067 228)
-
Step 900
900
#204757
oklch(37.7% 0.052 227.4)
-
Step 950
950
#142A33
oklch(27.1% 0.033 226.5)
#255B71 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) | #4F5972 | 0.048 |
| Deuteranopia (no green cones) | #455271 | 0.042 |
| Tritanopia (no blue cones) | #006162 | 0.040 |
| Achromatopsia (no color) | #555555 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255B71
#255B71
oklch(44.5% 0.067 228)
- #724832
#724832
oklch(44.4% 0.067 48.1)
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 #255B71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.026
- YInMn Blue #415A77 ΔE 0.032
- Light Navy Blue #2E5A88 ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.044
- Deep Teal #00555A ΔE 0.047
- Dark Aqua #05696B ΔE 0.049
- Denim #3B638C ΔE 0.054
- Light Navy #155084 ΔE 0.054
Use #255B71 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.