#2A7ADB
Closest named color: Windows Blue (#3778BF). oklch(58.3% 0.167 255.7), rgb(42, 122, 219).
Aa
Black text reads best on this color (4.90:1).
About this color
#2A7ADB is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.167 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.043 away. Black text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.90:1 |
| White text | 4.28:1 |
Values
| HEX | #2A7ADB |
| RGB | rgb(42, 122, 219) |
| HSL | hsl(213, 71%, 51%) |
| OKLCH | oklch(58.3% 0.167 255.7) |
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 #2A7ADB | 4.28:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #2A7ADB | 4.90:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #2A7ADB text on white | 4.28:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #2A7ADB text on black | 4.90:1 | AA | Lc -32.5 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A1C3F1
oklch(80.8% 0.075 256.1)
-
Step 400
400
#6DA3EA
oklch(70.7% 0.119 255.7)
-
Step 500
500
#438AE4
oklch(63.1% 0.154 255.6)
-
Step 600
600 (this color)
#2A7ADB
oklch(58.3% 0.167 255.7)
-
Step 700
700
#115FB6
oklch(49.2% 0.155 255.6)
-
Step 800
800
#134E93
oklch(42.8% 0.128 255.6)
-
Step 900
900
#184175
oklch(37.6% 0.1 256)
-
Step 950
950
#0F2745
oklch(27.1% 0.064 255.3)
#2A7ADB 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) | #4783DF | 0.036 |
| Deuteranopia (no green cones) | #2073D9 | 0.021 |
| Tritanopia (no blue cones) | #0091A0 | 0.126 |
| Achromatopsia (no color) | #7A7A7A | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A7ADB
#2A7ADB
oklch(58.3% 0.167 255.7)
- #A46F00
#A46F00
oklch(58.2% 0.122 75.8)
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 #2A7ADB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.043
- Royal Blue #4169E1 ΔE 0.046
- Water Blue #0E87CC ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.048
- Clear Blue #247AFD ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.060
- Nice Blue #107AB0 ΔE 0.070
- Cool Blue #4984B8 ΔE 0.070
Use #2A7ADB 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.