#5B91DC
Closest named color: Dark Sky Blue (#448EE4). oklch(65.2% 0.127 256.9), rgb(91, 145, 220).
Aa
Black text reads best on this color (6.52:1).
About this color
#5B91DC is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.127 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.026 away. Black text reads best on it, at 6.52:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.52:1 |
| White text | 3.21:1 |
Values
| HEX | #5B91DC |
| RGB | rgb(91, 145, 220) |
| HSL | hsl(215, 65%, 61%) |
| OKLCH | oklch(65.2% 0.127 256.9) |
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 #5B91DC | 3.21:1 | AA large text | Lc -64.6 | Content text, not long reading |
| Black text on #5B91DC | 6.52:1 | AA | Lc 44.9 | Non-text elements, placeholder text |
| #5B91DC text on white | 3.21:1 | AA large text | Lc 59.2 | Large or bold text, headings |
| #5B91DC text on black | 6.52:1 | AA | Lc -42.5 | 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 500.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBF0
oklch(88.6% 0.034 255.2)
-
Step 300
300
#A7C3E9
oklch(80.9% 0.062 256.1)
-
Step 400
400
#78A3DE
oklch(70.8% 0.099 256.5)
-
Step 500
500 (this color)
#5B91DC
oklch(65.2% 0.127 256.9)
-
Step 600
600
#3973C2
oklch(55.6% 0.137 256.8)
-
Step 700
700
#2B60A8
oklch(49.1% 0.129 256.9)
-
Step 800
800
#254F88
oklch(42.8% 0.106 256.8)
-
Step 900
900
#23426D
oklch(37.8% 0.083 257)
-
Step 950
950
#152740
oklch(27.1% 0.053 256.9)
#5B91DC 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) | #7296DF | 0.030 |
| Deuteranopia (no green cones) | #618ADA | 0.019 |
| Tritanopia (no blue cones) | #00A2AC | 0.109 |
| Achromatopsia (no color) | #8F8F8F | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B91DC
#5B91DC
oklch(65.2% 0.127 256.9)
- #BB8420
#BB8420
oklch(65.2% 0.127 76.7)
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 #5B91DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.026
- Cornflower Blue #6495ED ΔE 0.029
- Chefchaouen Blue #4895EF ΔE 0.031
- Soft Blue #6488EA ΔE 0.036
- Faded Blue #658CBB ΔE 0.049
- Dodger Blue #1E90FF ΔE 0.064
- Water Blue #0E87CC ΔE 0.065
- Cool Blue #4984B8 ΔE 0.065
Use #5B91DC 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.