#437AE2
Closest named color: Royal Blue (#4169E1). oklch(59.6% 0.169 261.7), rgb(67, 122, 226).
Aa
Black text reads best on this color (5.12:1).
About this color
#437AE2 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.169 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.044 away. Black text reads best on it, at 5.12:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 5.12:1 |
| White text | 4.10:1 |
Values
| HEX | #437AE2 |
| RGB | rgb(67, 122, 226) |
| HSL | hsl(219, 73%, 57%) |
| OKLCH | oklch(59.6% 0.169 261.7) |
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 #437AE2 | 4.10:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #437AE2 | 5.12:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #437AE2 text on white | 4.10:1 | AA large text | Lc 67.8 | Content text, not long reading |
| #437AE2 text on black | 5.12:1 | AA | Lc -33.9 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF8
oklch(88.5% 0.045 261.9)
-
Step 300
300
#A3C1F7
oklch(80.8% 0.084 262)
-
Step 400
400
#729FF3
oklch(70.6% 0.133 262.1)
-
Step 500
500 (this color)
#437AE2
oklch(59.6% 0.169 261.7)
-
Step 600
600
#316CDD
oklch(55.7% 0.184 261.7)
-
Step 700
700
#2459BF
oklch(49% 0.17 261.8)
-
Step 800
800
#1F4A9B
oklch(42.8% 0.141 261.6)
-
Step 900
900
#1E3E7B
oklch(37.6% 0.111 261.8)
-
Step 950
950
#122548
oklch(27% 0.07 261.5)
#437AE2 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) | #4485E6 | 0.029 |
| Deuteranopia (no green cones) | #2076E0 | 0.028 |
| Tritanopia (no blue cones) | #0092A3 | 0.134 |
| Achromatopsia (no color) | #7D7D7D | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437AE2
#437AE2
oklch(59.6% 0.169 261.7)
- #A37600
#A37600
oklch(59.5% 0.123 81.9)
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 #437AE2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.044
- Clear Blue #247AFD ΔE 0.044
- Cerulean Blue #056EEE ΔE 0.053
- Dark Sky Blue #448EE4 ΔE 0.053
- Cornflower #6A79F7 ΔE 0.054
- Soft Blue #6488EA ΔE 0.055
- Windows Blue #3778BF ΔE 0.056
- Water Blue #0E87CC ΔE 0.058
Use #437AE2 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.