#5191DD
Closest named color: Dark Sky Blue (#448EE4). oklch(64.8% 0.132 254), rgb(81, 145, 221).
Aa
Black text reads best on this color (6.44:1).
About this color
#5191DD is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.132 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.019 away. Black text reads best on it, at 6.44:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.44:1 |
| White text | 3.25:1 |
Values
| HEX | #5191DD |
| RGB | rgb(81, 145, 221) |
| HSL | hsl(213, 67%, 59%) |
| OKLCH | oklch(64.8% 0.132 254) |
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 #5191DD | 3.25:1 | AA large text | Lc -65.1 | Content text, not long reading |
| Black text on #5191DD | 6.44:1 | AA | Lc 44.4 | Non-text elements, placeholder text |
| #5191DD text on white | 3.25:1 | AA large text | Lc 59.7 | Large or bold text, headings |
| #5191DD text on black | 6.44:1 | AA | Lc -42.1 | 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
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A4C3EA
oklch(80.8% 0.065 254.3)
-
Step 400
400
#72A4E0
oklch(70.7% 0.103 253.6)
-
Step 500
500 (this color)
#5191DD
oklch(64.8% 0.132 254)
-
Step 600
600
#2C74C5
oklch(55.6% 0.144 254)
-
Step 700
700
#1F61AA
oklch(49.1% 0.134 254.1)
-
Step 800
800
#1C508A
oklch(42.9% 0.111 253.8)
-
Step 900
900
#1D426E
oklch(37.6% 0.087 254.4)
-
Step 950
950
#122740
oklch(26.9% 0.054 254)
#5191DD 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) | #7096E0 | 0.037 |
| Deuteranopia (no green cones) | #5D88DB | 0.025 |
| Tritanopia (no blue cones) | #00A3AD | 0.107 |
| Achromatopsia (no color) | #8E8E8E | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5191DD
#5191DD
oklch(64.8% 0.132 254)
- #BE8015
#BE8015
oklch(64.8% 0.132 73.5)
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 #5191DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.019
- Chefchaouen Blue #4895EF ΔE 0.027
- Cornflower Blue #6495ED ΔE 0.033
- Soft Blue #6488EA ΔE 0.038
- Faded Blue #658CBB ΔE 0.052
- Water Blue #0E87CC ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.058
- Cool Blue #4984B8 ΔE 0.062
Use #5191DD 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.