#51838E
Closest named color: Grey Blue (#647D8E). oklch(57.9% 0.056 213.2), rgb(81, 131, 142).
Aa
Black text reads best on this color (4.98:1).
About this color
#51838E is a medium-dark, muted teal or cyan. In OKLCH its lightness is 58%, its chroma 0.056 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.027 away. Black text reads best on it, at 4.98:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #51838E |
| RGB | rgb(81, 131, 142) |
| HSL | hsl(191, 27%, 44%) |
| OKLCH | oklch(57.9% 0.056 213.2) |
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 #51838E | 4.21:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #51838E | 4.98:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #51838E text on white | 4.21:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #51838E text on black | 4.98:1 | AA | Lc -32.7 | 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 600.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#CFDCDF
oklch(88.6% 0.015 213.1)
-
Step 300
300
#AFC5CA
oklch(80.8% 0.025 212.9)
-
Step 400
400
#84A8B0
oklch(70.8% 0.041 212.8)
-
Step 500
500
#64929C
oklch(63.1% 0.052 212.7)
-
Step 600
600 (this color)
#51838E
oklch(57.9% 0.056 213.2)
-
Step 700
700
#3B6973
oklch(49.2% 0.053 213.2)
-
Step 800
800
#31555D
oklch(42.6% 0.043 213.5)
-
Step 900
900
#2C464C
oklch(37.6% 0.033 213.8)
-
Step 950
950
#1A292D
oklch(26.9% 0.022 216.2)
#51838E 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) | #7A808F | 0.051 |
| Deuteranopia (no green cones) | #71788E | 0.048 |
| Tritanopia (no blue cones) | #368886 | 0.032 |
| Achromatopsia (no color) | #7B7B7B | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51838E
#51838E
oklch(57.9% 0.056 213.2)
- #986E64
#986E64
oklch(57.8% 0.056 33.8)
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 #51838E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.027
- Battleship Grey #6B7C85 ΔE 0.034
- Steel Grey #6F828A ΔE 0.035
- Stormy Blue #507B9C ΔE 0.037
- Slate Gray #708090 ΔE 0.038
- Cerulean #457B9D ΔE 0.041
- Steel #738595 ΔE 0.044
- Teal Blue #01889F ΔE 0.046
Use #51838E 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.