#2A7DBC
Closest named color: Windows Blue (#3778BF). oklch(57.1% 0.125 245.8), rgb(42, 125, 188).
Aa
Black text reads best on this color (4.75:1).
About this color
#2A7DBC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.125 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.017 away. Black text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.75:1 |
| White text | 4.41:1 |
Values
| HEX | #2A7DBC |
| RGB | rgb(42, 125, 188) |
| HSL | hsl(206, 63%, 45%) |
| OKLCH | oklch(57.1% 0.125 245.8) |
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 #2A7DBC | 4.41:1 | AA large text | Lc -75.7 | Fine for body text |
| Black text on #2A7DBC | 4.75:1 | AA | Lc 33.8 | Non-text elements, placeholder text |
| #2A7DBC text on white | 4.41:1 | AA large text | Lc 70.2 | Content text, not long reading |
| #2A7DBC text on black | 4.75:1 | AA | Lc -31.4 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCED
oklch(88.6% 0.031 245.1)
-
Step 300
300
#A3C5E3
oklch(80.9% 0.056 245.2)
-
Step 400
400
#70A6D5
oklch(70.6% 0.09 245.8)
-
Step 500
500
#478FCA
oklch(63% 0.115 245.8)
-
Step 600
600 (this color)
#2A7DBC
oklch(57.1% 0.125 245.8)
-
Step 700
700
#15659E
oklch(49.1% 0.116 245.9)
-
Step 800
800
#165380
oklch(42.8% 0.096 245.6)
-
Step 900
900
#1A4567
oklch(37.8% 0.075 245.6)
-
Step 950
950
#11283C
oklch(26.9% 0.047 246.9)
#2A7DBC 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) | #607FBF | 0.051 |
| Deuteranopia (no green cones) | #4B72BB | 0.037 |
| Tritanopia (no blue cones) | #008C94 | 0.088 |
| Achromatopsia (no color) | #787878 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A7DBC
#2A7DBC
oklch(57.1% 0.125 245.8)
- #A86609
#A86609
oklch(57.1% 0.124 66)
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 #2A7DBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.017
- Nice Blue #107AB0 ΔE 0.024
- Steel Blue #4682B4 ΔE 0.031
- Water Blue #0E87CC ΔE 0.033
- Cool Blue #4984B8 ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.037
- Blue NCS #118AB2 ΔE 0.044
- Cerulean #457B9D ΔE 0.050
Use #2A7DBC 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.