#5B91BF
Closest named color: Faded Blue (#658CBB). oklch(63.8% 0.09 245.6), rgb(91, 145, 191).
Aa
Black text reads best on this color (6.24:1).
About this color
#5B91BF is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.090 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.016 away. Black text reads best on it, at 6.24:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.24:1 |
| White text | 3.36:1 |
Values
| HEX | #5B91BF |
| RGB | rgb(91, 145, 191) |
| HSL | hsl(208, 44%, 55%) |
| OKLCH | oklch(63.8% 0.09 245.6) |
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 #5B91BF | 3.36:1 | AA large text | Lc -66.4 | Content text, not long reading |
| Black text on #5B91BF | 6.24:1 | AA | Lc 43.1 | Non-text elements, placeholder text |
| #5B91BF text on white | 3.36:1 | AA large text | Lc 60.9 | Content text, not long reading |
| #5B91BF text on black | 6.24:1 | AA | Lc -40.8 | 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 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
#CCDBE9
oklch(88.4% 0.025 246.2)
-
Step 300
300
#AAC4DC
oklch(80.9% 0.044 246.2)
-
Step 400
400
#7CA6CA
oklch(70.8% 0.07 244.9)
-
Step 500
500 (this color)
#5B91BF
oklch(63.8% 0.09 245.6)
-
Step 600
600
#3D78A9
oklch(55.5% 0.098 245.9)
-
Step 700
700
#2F6591
oklch(49.1% 0.091 245.8)
-
Step 800
800
#285376
oklch(42.8% 0.076 245.4)
-
Step 900
900
#25455F
oklch(37.8% 0.059 244.8)
-
Step 950
950
#162838
oklch(26.9% 0.038 246.6)
#5B91BF 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) | #7E92C1 | 0.042 |
| Deuteranopia (no green cones) | #7088BE | 0.032 |
| Tritanopia (no blue cones) | #239CA1 | 0.075 |
| Achromatopsia (no color) | #8C8C8C | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B91BF
#5B91BF
oklch(63.8% 0.09 245.6)
- #B1804E
#B1804E
oklch(63.8% 0.09 65.6)
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 #5B91BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.016
- Dusty Blue #5A86AD ΔE 0.036
- Off Blue #5684AE ΔE 0.041
- Silver Lake Blue #778DA9 ΔE 0.042
- Cool Blue #4984B8 ΔE 0.043
- Blue Grey #758DA3 ΔE 0.047
- Steel Blue #4682B4 ΔE 0.051
- Blue NCS #118AB2 ΔE 0.059
Use #5B91BF 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.