#51838F
Closest named color: Grey Blue (#647D8E). oklch(57.9% 0.057 214.7), rgb(81, 131, 143).
Aa
Black text reads best on this color (4.99:1).
About this color
#51838F is a medium-dark, muted teal or cyan. In OKLCH its lightness is 58%, its chroma 0.057 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.026 away. Black text reads best on it, at 4.99:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.99:1 |
| White text | 4.20:1 |
Values
| HEX | #51838F |
| RGB | rgb(81, 131, 143) |
| HSL | hsl(192, 28%, 44%) |
| OKLCH | oklch(57.9% 0.057 214.7) |
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 #51838F | 4.20:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #51838F | 4.99:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #51838F text on white | 4.20:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #51838F text on black | 4.99:1 | 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
#AFC5CB
oklch(80.9% 0.025 215.9)
-
Step 400
400
#84A8B0
oklch(70.8% 0.041 212.8)
-
Step 500
500
#64929D
oklch(63.1% 0.052 214.3)
-
Step 600
600 (this color)
#51838F
oklch(57.9% 0.057 214.7)
-
Step 700
700
#3B6973
oklch(49.2% 0.053 213.2)
-
Step 800
800
#31555E
oklch(42.6% 0.044 215.5)
-
Step 900
900
#2C464D
oklch(37.6% 0.034 216.5)
-
Step 950
950
#1A292D
oklch(26.9% 0.022 216.2)
#51838F 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) | #7A8090 | 0.051 |
| Deuteranopia (no green cones) | #70788F | 0.047 |
| Tritanopia (no blue cones) | #368887 | 0.032 |
| Achromatopsia (no color) | #7B7B7B | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51838F
#51838F
oklch(57.9% 0.057 214.7)
- #996E64
#996E64
oklch(57.9% 0.057 33.5)
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 #51838F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.026
- Battleship Grey #6B7C85 ΔE 0.034
- Steel Grey #6F828A ΔE 0.036
- Stormy Blue #507B9C ΔE 0.036
- Slate Gray #708090 ΔE 0.038
- Cerulean #457B9D ΔE 0.039
- Steel #738595 ΔE 0.044
- Teal Blue #01889F ΔE 0.045
Use #51838F 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.