#437FAF
Closest named color: Steel Blue (#4682B4). oklch(57.7% 0.097 244.8), rgb(67, 127, 175).
Aa
Black text reads best on this color (4.89:1).
About this color
#437FAF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.097 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.011 away. Black text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.89:1 |
| White text | 4.29:1 |
Values
| HEX | #437FAF |
| RGB | rgb(67, 127, 175) |
| HSL | hsl(207, 45%, 47%) |
| OKLCH | oklch(57.7% 0.097 244.8) |
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 #437FAF | 4.29:1 | AA large text | Lc -75.0 | Content text, not long reading |
| Black text on #437FAF | 4.89:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #437FAF text on white | 4.29:1 | AA large text | Lc 69.5 | Content text, not long reading |
| #437FAF text on black | 4.89:1 | AA | Lc -32.2 | 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 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDBE8
oklch(88.4% 0.024 244.2)
-
Step 300
300
#AAC4DC
oklch(80.9% 0.044 246.2)
-
Step 400
400
#7CA6CA
oklch(70.8% 0.07 244.9)
-
Step 500
500
#598FBC
oklch(63.1% 0.089 245)
-
Step 600
600 (this color)
#437FAF
oklch(57.7% 0.097 244.8)
-
Step 700
700
#2E6590
oklch(49% 0.09 244.8)
-
Step 800
800
#275375
oklch(42.7% 0.075 244.2)
-
Step 900
900
#25455E
oklch(37.8% 0.057 243.7)
-
Step 950
950
#162837
oklch(26.9% 0.037 244.9)
#437FAF 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) | #6A80B1 | 0.044 |
| Deuteranopia (no green cones) | #5B75AE | 0.035 |
| Tritanopia (no blue cones) | #008B90 | 0.076 |
| Achromatopsia (no color) | #7A7A7A | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437FAF
#437FAF
oklch(57.7% 0.097 244.8)
- #A16C36
#A16C36
oklch(57.6% 0.097 64.2)
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 #437FAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.011
- Cool Blue #4984B8 ΔE 0.020
- Off Blue #5684AE ΔE 0.026
- Cerulean #457B9D ΔE 0.028
- Stormy Blue #507B9C ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.034
- Dull Blue #49759C ΔE 0.036
- Nice Blue #107AB0 ΔE 0.036
Use #437FAF 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.