#4371AA
Closest named color: Flat Blue (#3C73A8). oklch(54.2% 0.103 254.6), rgb(67, 113, 170).
Aa
White text reads best on this color (5.02:1).
About this color
#4371AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.103 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.009 away. White text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.18:1 |
| White text | 5.02:1 |
Values
| HEX | #4371AA |
| RGB | rgb(67, 113, 170) |
| HSL | hsl(213, 43%, 46%) |
| OKLCH | oklch(54.2% 0.103 254.6) |
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 #4371AA | 5.02:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #4371AA | 4.18:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #4371AA text on white | 5.02:1 | AA | Lc 74.5 | Content text, not long reading |
| #4371AA text on black | 4.18:1 | AA large text | Lc -27.2 | Dividers and decoration only |
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 600.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEA
oklch(88.4% 0.026 255.6)
-
Step 300
300
#ADC3DF
oklch(81% 0.046 254.5)
-
Step 400
400
#81A3CF
oklch(70.7% 0.075 255.1)
-
Step 500
500
#618CC2
oklch(63.1% 0.095 254.6)
-
Step 600
600 (this color)
#4371AA
oklch(54.2% 0.103 254.6)
-
Step 700
700
#386296
oklch(49% 0.096 254.7)
-
Step 800
800
#2F507A
oklch(42.6% 0.08 255.1)
-
Step 900
900
#2A4362
oklch(37.8% 0.062 254.4)
-
Step 950
950
#192739
oklch(26.9% 0.039 255.1)
#4371AA 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) | #5974AC | 0.028 |
| Deuteranopia (no green cones) | #4B6BA9 | 0.018 |
| Tritanopia (no blue cones) | #007E86 | 0.086 |
| Achromatopsia (no color) | #6F6F6F | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4371AA
#4371AA
oklch(54.2% 0.103 254.6)
- #92651C
#92651C
oklch(54.1% 0.103 74.5)
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 #4371AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.009
- French Blue #436BAD ΔE 0.019
- Muted Blue #3B719F ΔE 0.020
- Dull Blue #49759C ΔE 0.028
- Windows Blue #3778BF ΔE 0.035
- Nice Blue #107AB0 ΔE 0.036
- Mid Blue #276AB3 ΔE 0.037
- Cerulean #457B9D ΔE 0.040
Use #4371AA 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.