#51798E
Closest named color: Metallic Blue (#4F738E). oklch(55.5% 0.055 232), rgb(81, 121, 142).
Aa
White text reads best on this color (4.69:1).
About this color
#51798E is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.055 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.019 away. White text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.47:1 |
| White text | 4.69:1 |
Values
| HEX | #51798E |
| RGB | rgb(81, 121, 142) |
| HSL | hsl(201, 27%, 44%) |
| OKLCH | oklch(55.5% 0.055 232) |
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 #51798E | 4.69:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #51798E | 4.47:1 | AA large text | Lc 31.6 | Non-text elements, placeholder text |
| #51798E text on white | 4.69:1 | AA | Lc 72.5 | Content text, not long reading |
| #51798E text on black | 4.47:1 | AA large text | Lc -29.2 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D1DBE1
oklch(88.6% 0.014 233.8)
-
Step 300
300
#B1C4CE
oklch(80.9% 0.025 230.5)
-
Step 400
400
#88A6B5
oklch(70.8% 0.04 229.6)
-
Step 500
500
#6A8FA3
oklch(63% 0.051 232.2)
-
Step 600
600 (this color)
#51798E
oklch(55.5% 0.055 232)
-
Step 700
700
#426679
oklch(49.1% 0.051 232.3)
-
Step 800
800
#365362
oklch(42.6% 0.043 231.6)
-
Step 900
900
#2F4550
oklch(37.7% 0.033 230.4)
-
Step 950
950
#1C282F
oklch(26.9% 0.021 234.2)
#51798E 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) | #6F788F | 0.039 |
| Deuteranopia (no green cones) | #66718E | 0.033 |
| Tritanopia (no blue cones) | #397F80 | 0.041 |
| Achromatopsia (no color) | #747474 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51798E
#51798E
oklch(55.5% 0.055 232)
- #8E6A55
#8E6A55
oklch(55.5% 0.056 51.5)
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 #51798E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.019
- Stormy Blue #507B9C ΔE 0.021
- Cerulean #457B9D ΔE 0.024
- Grey Blue #647D8E ΔE 0.027
- Dull Blue #49759C ΔE 0.029
- Battleship Grey #6B7C85 ΔE 0.037
- Battleship Gray #6C757D ΔE 0.040
- Slate Gray #708090 ΔE 0.047
Use #51798E 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.