#5999BF
Closest named color: Faded Blue (#658CBB). oklch(65.5% 0.087 236.2), rgb(89, 153, 191).
Aa
Black text reads best on this color (6.73:1).
About this color
#5999BF is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.087 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.036 away. Black text reads best on it, at 6.73:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.73:1 |
| White text | 3.11:1 |
Values
| HEX | #5999BF |
| RGB | rgb(89, 153, 191) |
| HSL | hsl(202, 44%, 55%) |
| OKLCH | oklch(65.5% 0.087 236.2) |
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 #5999BF | 3.11:1 | AA large text | Lc -63.5 | Content text, not long reading |
| Black text on #5999BF | 6.73:1 | AA | Lc 46.0 | Large or bold text, headings |
| #5999BF text on white | 3.11:1 | AA large text | Lc 58.1 | Large or bold text, headings |
| #5999BF text on black | 6.73:1 | AA | Lc -43.7 | 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
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A7C5D9
oklch(80.8% 0.043 237.3)
-
Step 400
400
#77A8C6
oklch(70.8% 0.068 235.9)
-
Step 500
500 (this color)
#5999BF
oklch(65.5% 0.087 236.2)
-
Step 600
600
#337BA3
oklch(55.5% 0.094 236.4)
-
Step 700
700
#25688C
oklch(49.2% 0.088 236.2)
-
Step 800
800
#205571
oklch(42.7% 0.072 235.2)
-
Step 900
900
#20465C
oklch(37.7% 0.057 236.4)
-
Step 950
950
#142936
oklch(27% 0.036 237.4)
#5999BF 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) | #8798C1 | 0.053 |
| Deuteranopia (no green cones) | #798DBE | 0.045 |
| Tritanopia (no blue cones) | #16A3A6 | 0.068 |
| Achromatopsia (no color) | #929292 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5999BF
#5999BF
oklch(65.5% 0.087 236.2)
- #BA835B
#BA835B
oklch(65.6% 0.087 56.6)
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 #5999BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.036
- Greyblue #77A1B5 ΔE 0.046
- Silver Lake Blue #778DA9 ΔE 0.047
- Blue Grey #758DA3 ΔE 0.050
- Cadet Blue #5F9EA0 ΔE 0.054
- Dusty Blue #5A86AD ΔE 0.054
- Off Blue #5684AE ΔE 0.060
- Cool Blue #4984B8 ΔE 0.063
Use #5999BF 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.