#3B91C4
Closest named color: Cool Blue (#4984B8). oklch(62.7% 0.112 238.4), rgb(59, 145, 196).
Aa
Black text reads best on this color (6.03:1).
About this color
#3B91C4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.112 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.037 away. Black text reads best on it, at 6.03:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 6.03:1 |
| White text | 3.48:1 |
Values
| HEX | #3B91C4 |
| RGB | rgb(59, 145, 196) |
| HSL | hsl(202, 54%, 50%) |
| OKLCH | oklch(62.7% 0.112 238.4) |
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 #3B91C4 | 3.48:1 | AA large text | Lc -67.5 | Content text, not long reading |
| Black text on #3B91C4 | 6.03:1 | AA | Lc 42.0 | Non-text elements, placeholder text |
| #3B91C4 text on white | 3.48:1 | AA large text | Lc 62.1 | Content text, not long reading |
| #3B91C4 text on black | 6.03:1 | AA | Lc -39.6 | 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
#C7DDEB
oklch(88.6% 0.03 235.7)
-
Step 300
300
#A0C6E0
oklch(80.8% 0.055 238.3)
-
Step 400
400
#6AA9D1
oklch(70.8% 0.088 237.6)
-
Step 500
500 (this color)
#3B91C4
oklch(62.7% 0.112 238.4)
-
Step 600
600
#097CB2
oklch(55.7% 0.122 238.2)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#03557C
oklch(42.7% 0.094 238.2)
-
Step 900
900
#124664
oklch(37.6% 0.074 239)
-
Step 950
950
#0D293A
oklch(26.9% 0.046 238.6)
#3B91C4 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) | #7991C6 | 0.062 |
| Deuteranopia (no green cones) | #6683C3 | 0.052 |
| Tritanopia (no blue cones) | #009EA2 | 0.077 |
| Achromatopsia (no color) | #898989 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B91C4
#3B91C4
oklch(62.7% 0.112 238.4)
- #BA763D
#BA763D
oklch(62.7% 0.112 58.5)
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 #3B91C4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.037
- Faded Blue #658CBB ΔE 0.038
- Blue NCS #118AB2 ΔE 0.040
- Water Blue #0E87CC ΔE 0.041
- Steel Blue #4682B4 ΔE 0.043
- Dusty Blue #5A86AD ΔE 0.044
- Off Blue #5684AE ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.053
Use #3B91C4 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.