#3B88BE
Closest named color: Cool Blue (#4984B8). oklch(60.3% 0.112 242.5), rgb(59, 136, 190).
Aa
Black text reads best on this color (5.45:1).
About this color
#3B88BE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.112 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.015 away. Black text reads best on it, at 5.45:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.45:1 |
| White text | 3.85:1 |
Values
| HEX | #3B88BE |
| RGB | rgb(59, 136, 190) |
| HSL | hsl(205, 53%, 49%) |
| OKLCH | oklch(60.3% 0.112 242.5) |
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 #3B88BE | 3.85:1 | AA large text | Lc -71.2 | Content text, not long reading |
| Black text on #3B88BE | 5.45:1 | AA | Lc 38.4 | Non-text elements, placeholder text |
| #3B88BE text on white | 3.85:1 | AA large text | Lc 65.7 | Content text, not long reading |
| #3B88BE text on black | 5.45:1 | AA | Lc -35.9 | 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
#A3C6E2
oklch(81% 0.055 242.5)
-
Step 400
400
#6FA7D3
oklch(70.7% 0.087 243.1)
-
Step 500
500 (this color)
#3B88BE
oklch(60.3% 0.112 242.5)
-
Step 600
600
#1E7AB4
oklch(55.6% 0.121 242.5)
-
Step 700
700
#0D669B
oklch(49% 0.113 242.9)
-
Step 800
800
#11547E
oklch(42.8% 0.094 242.5)
-
Step 900
900
#184565
oklch(37.6% 0.073 243.3)
-
Step 950
950
#10293B
oklch(27.1% 0.046 242.4)
#3B88BE 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) | #6F89C0 | 0.053 |
| Deuteranopia (no green cones) | #5D7CBD | 0.043 |
| Tritanopia (no blue cones) | #00959B | 0.079 |
| Achromatopsia (no color) | #828282 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B88BE
#3B88BE
oklch(60.3% 0.112 242.5)
- #B07031
#B07031
oklch(60.2% 0.112 62.1)
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 #3B88BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.015
- Steel Blue #4682B4 ΔE 0.020
- Water Blue #0E87CC ΔE 0.029
- Blue NCS #118AB2 ΔE 0.030
- Off Blue #5684AE ΔE 0.031
- Dusty Blue #5A86AD ΔE 0.035
- Faded Blue #658CBB ΔE 0.043
- Windows Blue #3778BF ΔE 0.047
Use #3B88BE 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.