#5B78AA
Closest named color: Stormy Blue (#507B9C). oklch(57.1% 0.085 260.9), rgb(91, 120, 170).
Aa
Black text reads best on this color (4.71:1).
About this color
#5B78AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.085 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.029 away. Black text reads best on it, at 4.71:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.71:1 |
| White text | 4.45:1 |
Values
| HEX | #5B78AA |
| RGB | rgb(91, 120, 170) |
| HSL | hsl(218, 32%, 51%) |
| OKLCH | oklch(57.1% 0.085 260.9) |
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 #5B78AA | 4.45:1 | AA large text | Lc -76.3 | Fine for body text |
| Black text on #5B78AA | 4.71:1 | AA | Lc 33.2 | Non-text elements, placeholder text |
| #5B78AA text on white | 4.45:1 | AA large text | Lc 70.9 | Content text, not long reading |
| #5B78AA text on black | 4.71:1 | AA | Lc -30.8 | 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
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D1DAE8
oklch(88.6% 0.022 259.2)
-
Step 300
300
#B3C1DA
oklch(80.8% 0.039 262.1)
-
Step 400
400
#8BA1C7
oklch(70.6% 0.061 261.3)
-
Step 500
500
#6F8AB9
oklch(63.1% 0.078 261.3)
-
Step 600
600 (this color)
#5B78AA
oklch(57.1% 0.085 260.9)
-
Step 700
700
#47618E
oklch(49.2% 0.079 261)
-
Step 800
800
#3A4F73
oklch(42.7% 0.066 260.8)
-
Step 900
900
#32425D
oklch(37.8% 0.051 260.6)
-
Step 950
950
#1D2736
oklch(27% 0.031 258.3)
#5B78AA 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) | #657BAC | 0.016 |
| Deuteranopia (no green cones) | #5D74A9 | 0.011 |
| Tritanopia (no blue cones) | #3C838A | 0.075 |
| Achromatopsia (no color) | #777777 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B78AA
#5B78AA
oklch(57.1% 0.085 260.9)
- #917239
#917239
oklch(57% 0.084 80.9)
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 #5B78AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.029
- Dull Blue #49759C ΔE 0.032
- Steel Blue #4682B4 ΔE 0.033
- Off Blue #5684AE ΔE 0.033
- Cerulean #457B9D ΔE 0.035
- Cool Blue #4984B8 ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.039
Use #5B78AA 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.