#3F8EBD
Closest named color: Cool Blue (#4984B8). oklch(61.8% 0.105 238), rgb(63, 142, 189).
Aa
Black text reads best on this color (5.81:1).
About this color
#3F8EBD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.105 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.027 away. Black text reads best on it, at 5.81:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.81:1 |
| White text | 3.61:1 |
Values
| HEX | #3F8EBD |
| RGB | rgb(63, 142, 189) |
| HSL | hsl(202, 50%, 49%) |
| OKLCH | oklch(61.8% 0.105 238) |
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 #3F8EBD | 3.61:1 | AA large text | Lc -68.9 | Content text, not long reading |
| Black text on #3F8EBD | 5.81:1 | AA | Lc 40.6 | Non-text elements, placeholder text |
| #3F8EBD text on white | 3.61:1 | AA large text | Lc 63.4 | Content text, not long reading |
| #3F8EBD text on black | 5.81:1 | AA | Lc -38.2 | 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
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C9DCEA
oklch(88.5% 0.028 239.7)
-
Step 300
300
#A2C6DE
oklch(80.8% 0.051 237.5)
-
Step 400
400
#6EA8CE
oklch(70.6% 0.082 238.2)
-
Step 500
500 (this color)
#3F8EBD
oklch(61.8% 0.105 238)
-
Step 600
600
#1C7CAE
oklch(55.7% 0.114 237.8)
-
Step 700
700
#096895
oklch(49.1% 0.106 237.7)
-
Step 800
800
#105579
oklch(42.7% 0.087 237.9)
-
Step 900
900
#174661
oklch(37.6% 0.068 237.9)
-
Step 950
950
#0F2939
oklch(26.9% 0.044 238.4)
#3F8EBD 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) | #788EBF | 0.059 |
| Deuteranopia (no green cones) | #6781BC | 0.050 |
| Tritanopia (no blue cones) | #009A9E | 0.072 |
| Achromatopsia (no color) | #878787 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F8EBD
#3F8EBD
oklch(61.8% 0.105 238)
- #B47541
#B47541
oklch(61.8% 0.104 58.6)
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 #3F8EBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.027
- Blue NCS #118AB2 ΔE 0.033
- Steel Blue #4682B4 ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.034
- Off Blue #5684AE ΔE 0.034
- Faded Blue #658CBB ΔE 0.035
- Water Blue #0E87CC ΔE 0.042
- Teal Blue #01889F ΔE 0.058
Use #3F8EBD 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.