#3D8BBC
Closest named color: Cool Blue (#4984B8). oklch(61% 0.106 239.5), rgb(61, 139, 188).
Aa
Black text reads best on this color (5.61:1).
About this color
#3D8BBC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.106 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.020 away. Black text reads best on it, at 5.61:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.61:1 |
| White text | 3.73:1 |
Values
| HEX | #3D8BBC |
| RGB | rgb(61, 139, 188) |
| HSL | hsl(203, 51%, 49%) |
| OKLCH | oklch(61% 0.106 239.5) |
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 #3D8BBC | 3.73:1 | AA large text | Lc -70.2 | Content text, not long reading |
| Black text on #3D8BBC | 5.61:1 | AA | Lc 39.4 | Non-text elements, placeholder text |
| #3D8BBC text on white | 3.73:1 | AA large text | Lc 64.7 | Content text, not long reading |
| #3D8BBC text on black | 5.61:1 | AA | Lc -37.0 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A3C6DF
oklch(80.9% 0.052 239.4)
-
Step 400
400
#6FA8CF
oklch(70.7% 0.083 239.4)
-
Step 500
500 (this color)
#3D8BBC
oklch(61% 0.106 239.5)
-
Step 600
600
#1D7BAF
oklch(55.6% 0.115 239.2)
-
Step 700
700
#0C6797
oklch(49% 0.108 239.9)
-
Step 800
800
#11557A
oklch(42.8% 0.088 238.8)
-
Step 900
900
#184662
oklch(37.7% 0.069 239.2)
-
Step 950
950
#10293A
oklch(27% 0.044 240.8)
#3D8BBC 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) | #748BBE | 0.057 |
| Deuteranopia (no green cones) | #637FBB | 0.046 |
| Tritanopia (no blue cones) | #00979C | 0.073 |
| Achromatopsia (no color) | #848484 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D8BBC
#3D8BBC
oklch(61% 0.106 239.5)
- #B2723C
#B2723C
oklch(61% 0.107 58.9)
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 #3D8BBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.020
- Steel Blue #4682B4 ΔE 0.025
- Blue NCS #118AB2 ΔE 0.028
- Off Blue #5684AE ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.032
- Water Blue #0E87CC ΔE 0.037
- Faded Blue #658CBB ΔE 0.039
- Teal Blue #01889F ΔE 0.055
Use #3D8BBC 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.