#3A7FB5
Closest named color: Steel Blue (#4682B4). oklch(57.7% 0.109 245), rgb(58, 127, 181).
Aa
Black text reads best on this color (4.88:1).
About this color
#3A7FB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.109 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.015 away. Black text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.88:1 |
| White text | 4.30:1 |
Values
| HEX | #3A7FB5 |
| RGB | rgb(58, 127, 181) |
| HSL | hsl(206, 51%, 47%) |
| OKLCH | oklch(57.7% 0.109 245) |
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 #3A7FB5 | 4.30:1 | AA large text | Lc -75.0 | Content text, not long reading |
| Black text on #3A7FB5 | 4.88:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #3A7FB5 text on white | 4.30:1 | AA large text | Lc 69.5 | Content text, not long reading |
| #3A7FB5 text on black | 4.88:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CBDCEA
oklch(88.6% 0.027 242.8)
-
Step 300
300
#A7C5DF
oklch(81% 0.049 244.6)
-
Step 400
400
#77A6CF
oklch(70.7% 0.079 245.5)
-
Step 500
500
#528FC2
oklch(63% 0.1 245.5)
-
Step 600
600 (this color)
#3A7FB5
oklch(57.7% 0.109 245)
-
Step 700
700
#256596
oklch(49% 0.102 245.4)
-
Step 800
800
#21537A
oklch(42.8% 0.084 245.3)
-
Step 900
900
#214562
oklch(37.8% 0.065 245.1)
-
Step 950
950
#142839
oklch(26.9% 0.041 245.8)
#3A7FB5 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) | #6780B7 | 0.048 |
| Deuteranopia (no green cones) | #5675B4 | 0.036 |
| Tritanopia (no blue cones) | #008C92 | 0.080 |
| Achromatopsia (no color) | #7A7A7A | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A7FB5
#3A7FB5
oklch(57.7% 0.109 245)
- #A56A2A
#A56A2A
oklch(57.6% 0.109 64.4)
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 #3A7FB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.015
- Cool Blue #4984B8 ΔE 0.021
- Windows Blue #3778BF ΔE 0.028
- Nice Blue #107AB0 ΔE 0.030
- Off Blue #5684AE ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.036
- Blue NCS #118AB2 ΔE 0.036
- Cerulean #457B9D ΔE 0.037
Use #3A7FB5 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.