#3A87BA
Closest named color: Cool Blue (#4984B8). oklch(59.8% 0.108 241), rgb(58, 135, 186).
Aa
Black text reads best on this color (5.35:1).
About this color
#3A87BA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.108 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.013 away. Black text reads best on it, at 5.35:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.35:1 |
| White text | 3.92:1 |
Values
| HEX | #3A87BA |
| RGB | rgb(58, 135, 186) |
| HSL | hsl(204, 52%, 48%) |
| OKLCH | oklch(59.8% 0.108 241) |
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 #3A87BA | 3.92:1 | AA large text | Lc -71.9 | Content text, not long reading |
| Black text on #3A87BA | 5.35:1 | AA | Lc 37.7 | Non-text elements, placeholder text |
| #3A87BA text on white | 3.92:1 | AA large text | Lc 66.4 | Content text, not long reading |
| #3A87BA text on black | 5.35:1 | AA | Lc -35.3 | 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
#A3C6E0
oklch(81% 0.053 240.5)
-
Step 400
400
#6FA8D1
oklch(70.8% 0.085 240.8)
-
Step 500
500 (this color)
#3A87BA
oklch(59.8% 0.108 241)
-
Step 600
600
#1F7AB1
oklch(55.5% 0.118 241.2)
-
Step 700
700
#0E6798
oklch(49.1% 0.109 240.7)
-
Step 800
800
#12547C
oklch(42.7% 0.091 241.4)
-
Step 900
900
#184663
oklch(37.7% 0.07 240.2)
-
Step 950
950
#10293A
oklch(27% 0.044 240.8)
#3A87BA 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) | #7087BC | 0.056 |
| Deuteranopia (no green cones) | #5E7BB9 | 0.044 |
| Tritanopia (no blue cones) | #009499 | 0.076 |
| Achromatopsia (no color) | #818181 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A87BA
#3A87BA
oklch(59.8% 0.108 241)
- #AE6F35
#AE6F35
oklch(59.8% 0.108 60.8)
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 #3A87BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.013
- Steel Blue #4682B4 ΔE 0.016
- Blue NCS #118AB2 ΔE 0.026
- Off Blue #5684AE ΔE 0.028
- Water Blue #0E87CC ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.033
- Faded Blue #658CBB ΔE 0.046
- Windows Blue #3778BF ΔE 0.046
Use #3A87BA 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.