#2F77B5
Closest named color: Windows Blue (#3778BF). oklch(55.4% 0.12 248), rgb(47, 119, 181).
Aa
White text reads best on this color (4.74:1).
About this color
#2F77B5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.120 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.017 away. White text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #2F77B5 |
| RGB | rgb(47, 119, 181) |
| HSL | hsl(208, 59%, 45%) |
| OKLCH | oklch(55.4% 0.12 248) |
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 #2F77B5 | 4.74:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #2F77B5 | 4.42:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #2F77B5 text on white | 4.74:1 | AA | Lc 72.6 | Content text, not long reading |
| #2F77B5 text on black | 4.42:1 | AA large text | Lc -29.1 | Dividers and decoration only |
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
#CADBEC
oklch(88.4% 0.03 248.2)
-
Step 300
300
#A6C4E2
oklch(80.8% 0.054 248.5)
-
Step 400
400
#75A6D4
oklch(70.8% 0.086 247.6)
-
Step 500
500
#4F8EC9
oklch(63% 0.111 248.5)
-
Step 600
600 (this color)
#2F77B5
oklch(55.4% 0.12 248)
-
Step 700
700
#22649C
oklch(49% 0.111 248.2)
-
Step 800
800
#1E527F
oklch(42.7% 0.093 248.2)
-
Step 900
900
#1F4466
oklch(37.7% 0.072 248.5)
-
Step 950
950
#13283C
oklch(27% 0.046 248.8)
#2F77B5 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) | #5B7AB8 | 0.045 |
| Deuteranopia (no green cones) | #476DB4 | 0.032 |
| Tritanopia (no blue cones) | #00868D | 0.089 |
| Achromatopsia (no color) | #737373 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F77B5
#2F77B5
oklch(55.4% 0.12 248)
- #A06305
#A06305
oklch(55.4% 0.12 68)
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 #2F77B5, 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 0.019
- Flat Blue #3C73A8 ΔE 0.022
- French Blue #436BAD ΔE 0.035
- Muted Blue #3B719F ΔE 0.035
- Mid Blue #276AB3 ΔE 0.038
- Steel Blue #4682B4 ΔE 0.040
- Dull Blue #49759C ΔE 0.042
Use #2F77B5 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.