#2A7BB9
Closest named color: Windows Blue (#3778BF). oklch(56.4% 0.123 245.9), rgb(42, 123, 185).
Aa
Black text reads best on this color (4.63:1).
About this color
#2A7BB9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.123 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.016 away. Black text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.63:1 |
| White text | 4.53:1 |
Values
| HEX | #2A7BB9 |
| RGB | rgb(42, 123, 185) |
| HSL | hsl(206, 63%, 45%) |
| OKLCH | oklch(56.4% 0.123 245.9) |
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 #2A7BB9 | 4.53:1 | AA | Lc -76.6 | Fine for body text |
| Black text on #2A7BB9 | 4.63:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #2A7BB9 text on white | 4.53:1 | AA | Lc 71.1 | Content text, not long reading |
| #2A7BB9 text on black | 4.63:1 | AA | Lc -30.6 | 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
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#C9DCED
oklch(88.6% 0.031 245.1)
-
Step 300
300
#A4C5E3
oklch(80.9% 0.055 246)
-
Step 400
400
#71A6D5
oklch(70.6% 0.089 246.2)
-
Step 500
500
#498FCA
oklch(63% 0.114 246.3)
-
Step 600
600 (this color)
#2A7BB9
oklch(56.4% 0.123 245.9)
-
Step 700
700
#18659D
oklch(49.1% 0.114 245.9)
-
Step 800
800
#18537F
oklch(42.8% 0.094 245.5)
-
Step 900
900
#1B4566
oklch(37.8% 0.073 245.3)
-
Step 950
950
#11283C
oklch(26.9% 0.047 246.9)
#2A7BB9 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) | #5E7DBC | 0.049 |
| Deuteranopia (no green cones) | #4A70B8 | 0.037 |
| Tritanopia (no blue cones) | #008A91 | 0.088 |
| Achromatopsia (no color) | #767676 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A7BB9
#2A7BB9
oklch(56.4% 0.123 245.9)
- #A56409
#A56409
oklch(56.3% 0.123 65.8)
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 #2A7BB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.016
- Nice Blue #107AB0 ΔE 0.019
- Flat Blue #3C73A8 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.033
- Cool Blue #4984B8 ΔE 0.039
- Water Blue #0E87CC ΔE 0.039
- Muted Blue #3B719F ΔE 0.044
- French Blue #436BAD ΔE 0.046
Use #2A7BB9 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.