#5991BC
Closest named color: Faded Blue (#658CBB). oklch(63.5% 0.088 242.9), rgb(89, 145, 188).
Aa
Black text reads best on this color (6.20:1).
About this color
#5991BC is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.088 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.017 away. Black text reads best on it, at 6.20:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.20:1 |
| White text | 3.38:1 |
Values
| HEX | #5991BC |
| RGB | rgb(89, 145, 188) |
| HSL | hsl(206, 42%, 54%) |
| OKLCH | oklch(63.5% 0.088 242.9) |
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 #5991BC | 3.38:1 | AA large text | Lc -66.7 | Content text, not long reading |
| Black text on #5991BC | 6.20:1 | AA | Lc 42.9 | Non-text elements, placeholder text |
| #5991BC text on white | 3.38:1 | AA large text | Lc 61.2 | Content text, not long reading |
| #5991BC text on black | 6.20:1 | AA | Lc -40.5 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDBE8
oklch(88.4% 0.024 244.2)
-
Step 300
300
#A9C5DB
oklch(81% 0.043 241.8)
-
Step 400
400
#7BA6C9
oklch(70.7% 0.069 243.5)
-
Step 500
500 (this color)
#5991BC
oklch(63.5% 0.088 242.9)
-
Step 600
600
#3B79A7
oklch(55.6% 0.096 243.2)
-
Step 700
700
#2D668F
oklch(49.1% 0.089 242.8)
-
Step 800
800
#275374
oklch(42.7% 0.073 243.4)
-
Step 900
900
#24455E
oklch(37.7% 0.058 243)
-
Step 950
950
#162837
oklch(26.9% 0.037 244.9)
#5991BC 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) | #7E91BE | 0.043 |
| Deuteranopia (no green cones) | #7187BB | 0.036 |
| Tritanopia (no blue cones) | #1F9B9F | 0.073 |
| Achromatopsia (no color) | #8B8B8B | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5991BC
#5991BC
oklch(63.5% 0.088 242.9)
- #B17F51
#B17F51
oklch(63.6% 0.088 62.8)
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 #5991BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.017
- Dusty Blue #5A86AD ΔE 0.034
- Off Blue #5684AE ΔE 0.039
- Silver Lake Blue #778DA9 ΔE 0.041
- Cool Blue #4984B8 ΔE 0.042
- Blue Grey #758DA3 ΔE 0.045
- Steel Blue #4682B4 ΔE 0.049
- Blue NCS #118AB2 ΔE 0.056
Use #5991BC 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.