#4183BF
Closest named color: Cool Blue (#4984B8). oklch(59.4% 0.114 248.3), rgb(65, 131, 191).
Aa
Black text reads best on this color (5.22:1).
About this color
#4183BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.114 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.014 away. Black text reads best on it, at 5.22:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.22:1 |
| White text | 4.02:1 |
Values
| HEX | #4183BF |
| RGB | rgb(65, 131, 191) |
| HSL | hsl(209, 50%, 50%) |
| OKLCH | oklch(59.4% 0.114 248.3) |
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 #4183BF | 4.02:1 | AA large text | Lc -72.7 | Content text, not long reading |
| Black text on #4183BF | 5.22:1 | AA | Lc 36.8 | Non-text elements, placeholder text |
| #4183BF text on white | 4.02:1 | AA large text | Lc 67.2 | Content text, not long reading |
| #4183BF text on black | 5.22:1 | AA | Lc -34.4 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADBED
oklch(88.4% 0.031 249.7)
-
Step 300
300
#A5C4E4
oklch(80.8% 0.056 249.4)
-
Step 400
400
#73A6D6
oklch(70.8% 0.089 247.7)
-
Step 500
500 (this color)
#4183BF
oklch(59.4% 0.114 248.3)
-
Step 600
600
#2C77B8
oklch(55.5% 0.125 248.5)
-
Step 700
700
#1E649F
oklch(49.1% 0.116 248.6)
-
Step 800
800
#1C5280
oklch(42.7% 0.095 248.1)
-
Step 900
900
#1D4467
oklch(37.6% 0.075 248.2)
-
Step 950
950
#12283C
oklch(26.9% 0.047 247.8)
#4183BF 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) | #6985C2 | 0.044 |
| Deuteranopia (no green cones) | #5779BE | 0.032 |
| Tritanopia (no blue cones) | #009198 | 0.088 |
| Achromatopsia (no color) | #7F7F7F | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4183BF
#4183BF
oklch(59.4% 0.114 248.3)
- #AA7025
#AA7025
oklch(59.3% 0.114 68.5)
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 #4183BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.014
- Steel Blue #4682B4 ΔE 0.017
- Water Blue #0E87CC ΔE 0.029
- Off Blue #5684AE ΔE 0.033
- Windows Blue #3778BF ΔE 0.034
- Dusty Blue #5A86AD ΔE 0.039
- Blue NCS #118AB2 ΔE 0.040
- Nice Blue #107AB0 ΔE 0.047
Use #4183BF 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.