#2A7FCB
Closest named color: Water Blue (#0E87CC). oklch(58.4% 0.141 249.7), rgb(42, 127, 203).
Aa
Black text reads best on this color (4.99:1).
About this color
#2A7FCB is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.141 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.022 away. Black text reads best on it, at 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.99:1 |
| White text | 4.20:1 |
Values
| HEX | #2A7FCB |
| RGB | rgb(42, 127, 203) |
| HSL | hsl(208, 66%, 48%) |
| OKLCH | oklch(58.4% 0.141 249.7) |
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 #2A7FCB | 4.20:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #2A7FCB | 4.99:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #2A7FCB text on white | 4.20:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #2A7FCB text on black | 4.99:1 | AA | Lc -33.1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCF0
oklch(88.6% 0.035 248.2)
-
Step 300
300
#A2C5E9
oklch(81% 0.063 249.3)
-
Step 400
400
#6EA5DE
oklch(70.7% 0.102 250.3)
-
Step 500
500
#448ED4
oklch(63.2% 0.129 249.5)
-
Step 600
600 (this color)
#2A7FCB
oklch(58.4% 0.141 249.7)
-
Step 700
700
#0F63A7
oklch(49.1% 0.131 249.7)
-
Step 800
800
#125187
oklch(42.6% 0.108 249.7)
-
Step 900
900
#18446C
oklch(37.8% 0.084 249.3)
-
Step 950
950
#0F283F
oklch(27% 0.053 248.7)
#2A7FCB 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) | #5B83CE | 0.045 |
| Deuteranopia (no green cones) | #4275CA | 0.029 |
| Tritanopia (no blue cones) | #00919B | 0.103 |
| Achromatopsia (no color) | #7C7C7C | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A7FCB
#2A7FCB
oklch(58.4% 0.141 249.7)
- #AB6C00
#AB6C00
oklch(58.5% 0.127 69.8)
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 #2A7FCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.022
- Windows Blue #3778BF ΔE 0.024
- Cool Blue #4984B8 ΔE 0.042
- Steel Blue #4682B4 ΔE 0.043
- Nice Blue #107AB0 ΔE 0.046
- Blue NCS #118AB2 ΔE 0.056
- Flat Blue #3C73A8 ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.058
Use #2A7FCB 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.