#2F509B
Closest named color: Dusk Blue (#26538D). oklch(44.8% 0.128 264.1), rgb(47, 80, 155).
Aa
White text reads best on this color (7.65:1).
About this color
#2F509B is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.128 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.027 away. White text reads best on it, at 7.65:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.74:1 |
| White text | 7.65:1 |
Values
| HEX | #2F509B |
| RGB | rgb(47, 80, 155) |
| HSL | hsl(222, 53%, 40%) |
| OKLCH | oklch(44.8% 0.128 264.1) |
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 #2F509B | 7.65:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #2F509B | 2.74:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #2F509B text on white | 7.65:1 | AAA | Lc 86.3 | Fine for body text |
| #2F509B text on black | 2.74:1 | Fails | Lc -15.8 | 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 800.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CBDAF6
oklch(88.6% 0.042 263)
-
Step 300
300
#A8C1F2
oklch(80.9% 0.075 263.7)
-
Step 400
400
#7A9FEC
oklch(70.7% 0.121 264)
-
Step 500
500
#5985E5
oklch(63.1% 0.153 264)
-
Step 600
600
#3F6CD3
oklch(55.5% 0.166 264)
-
Step 700
700
#325AB7
oklch(49.1% 0.154 264)
-
Step 800
800 (this color)
#2F509B
oklch(44.8% 0.128 264.1)
-
Step 900
900
#263E76
oklch(37.6% 0.1 264.6)
-
Step 950
950
#162545
oklch(27% 0.063 263.8)
#2F509B 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) | #28599E | 0.025 |
| Deuteranopia (no green cones) | #0F4F99 | 0.025 |
| Tritanopia (no blue cones) | #00616E | 0.103 |
| Achromatopsia (no color) | #535353 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F509B
#2F509B
oklch(44.8% 0.128 264.1)
- #6D4F00
#6D4F00
oklch(44.8% 0.092 83.3)
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 #2F509B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.027
- Cobalt #1E488F ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.041
- Light Navy #155084 ΔE 0.045
- Blueberry #464196 ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.046
- Twilight #4E518B ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.054
Use #2F509B 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.