#3A87BC
Closest named color: Cool Blue (#4984B8). oklch(59.9% 0.111 242), rgb(58, 135, 188).
Aa
Black text reads best on this color (5.37:1).
About this color
#3A87BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.111 and its hue 242°. 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 5.37:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.37:1 |
| White text | 3.90:1 |
Values
| HEX | #3A87BC |
| RGB | rgb(58, 135, 188) |
| HSL | hsl(204, 53%, 48%) |
| OKLCH | oklch(59.9% 0.111 242) |
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 #3A87BC | 3.90:1 | AA large text | Lc -71.7 | Content text, not long reading |
| Black text on #3A87BC | 5.37:1 | AA | Lc 37.8 | Non-text elements, placeholder text |
| #3A87BC text on white | 3.90:1 | AA large text | Lc 66.2 | Content text, not long reading |
| #3A87BC text on black | 5.37:1 | AA | Lc -35.4 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A3C6E1
oklch(81% 0.054 241.5)
-
Step 400
400
#6FA7D2
oklch(70.6% 0.086 242.5)
-
Step 500
500 (this color)
#3A87BC
oklch(59.9% 0.111 242)
-
Step 600
600
#1E7AB3
oklch(55.6% 0.12 242)
-
Step 700
700
#0D679A
oklch(49.2% 0.111 241.6)
-
Step 800
800
#12547D
oklch(42.8% 0.092 242)
-
Step 900
900
#184664
oklch(37.8% 0.071 241.1)
-
Step 950
950
#10293B
oklch(27.1% 0.046 242.4)
#3A87BC 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) | #6F88BE | 0.055 |
| Deuteranopia (no green cones) | #5D7BBB | 0.043 |
| Tritanopia (no blue cones) | #009499 | 0.079 |
| Achromatopsia (no color) | #818181 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A87BC
#3A87BC
oklch(59.9% 0.111 242)
- #AE6F32
#AE6F32
oklch(59.8% 0.11 61.8)
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 #3A87BC, 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
- Blue NCS #118AB2 ΔE 0.028
- Off Blue #5684AE ΔE 0.030
- Water Blue #0E87CC ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.035
- Windows Blue #3778BF ΔE 0.045
- Faded Blue #658CBB ΔE 0.046
Use #3A87BC 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.