#3F91BA
Closest named color: Blue NCS (#118AB2). oklch(62.4% 0.1 233.4), rgb(63, 145, 186).
Aa
Black text reads best on this color (5.97:1).
About this color
#3F91BA is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.100 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.035 away. Black text reads best on it, at 5.97:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.97:1 |
| White text | 3.51:1 |
Values
| HEX | #3F91BA |
| RGB | rgb(63, 145, 186) |
| HSL | hsl(200, 49%, 49%) |
| OKLCH | oklch(62.4% 0.1 233.4) |
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 #3F91BA | 3.51:1 | AA large text | Lc -68.0 | Content text, not long reading |
| Black text on #3F91BA | 5.97:1 | AA | Lc 41.6 | Non-text elements, placeholder text |
| #3F91BA text on white | 3.51:1 | AA large text | Lc 62.5 | Content text, not long reading |
| #3F91BA text on black | 5.97:1 | AA | Lc -39.2 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE9
oklch(88.6% 0.028 232.7)
-
Step 300
300
#A2C7DC
oklch(81% 0.049 233.1)
-
Step 400
400
#6DA9CA
oklch(70.6% 0.079 233.5)
-
Step 500
500 (this color)
#3F91BA
oklch(62.4% 0.1 233.4)
-
Step 600
600
#177DA9
oklch(55.6% 0.109 233.6)
-
Step 700
700
#026991
oklch(49.1% 0.102 233.8)
-
Step 800
800
#0C5675
oklch(42.7% 0.083 232.9)
-
Step 900
900
#16475F
oklch(37.7% 0.066 233.8)
-
Step 950
950
#0F2A37
oklch(27.1% 0.041 231.9)
#3F91BA 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) | #7D90BC | 0.065 |
| Deuteranopia (no green cones) | #6C83B9 | 0.055 |
| Tritanopia (no blue cones) | #009C9F | 0.065 |
| Achromatopsia (no color) | #898989 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F91BA
#3F91BA
oklch(62.4% 0.1 233.4)
- #B6764B
#B6764B
oklch(62.4% 0.099 53.8)
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 #3F91BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.035
- Dusty Blue #5A86AD ΔE 0.036
- Cool Blue #4984B8 ΔE 0.036
- Faded Blue #658CBB ΔE 0.037
- Off Blue #5684AE ΔE 0.038
- Steel Blue #4682B4 ΔE 0.042
- Water Blue #0E87CC ΔE 0.051
- Teal Blue #01889F ΔE 0.056
Use #3F91BA 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.