#2F538B
Closest named color: Dusk Blue (#26538D). oklch(44.4% 0.101 258.9), rgb(47, 83, 139).
Aa
White text reads best on this color (7.68:1).
About this color
#2F538B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.101 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.009 away. White text reads best on it, at 7.68:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.73:1 |
| White text | 7.68:1 |
Values
| HEX | #2F538B |
| RGB | rgb(47, 83, 139) |
| HSL | hsl(217, 49%, 36%) |
| OKLCH | oklch(44.4% 0.101 258.9) |
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 #2F538B | 7.68:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #2F538B | 2.73:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #2F538B text on white | 7.68:1 | AAA | Lc 86.5 | Fine for body text |
| #2F538B text on black | 2.73:1 | Fails | Lc -15.6 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CCDAEF
oklch(88.4% 0.033 258.4)
-
Step 300
300
#AAC2E7
oklch(80.9% 0.059 259)
-
Step 400
400
#7CA2DC
oklch(70.7% 0.095 258.6)
-
Step 500
500
#5B8AD2
oklch(63.2% 0.121 258.7)
-
Step 600
600
#4172BF
oklch(55.6% 0.131 259.1)
-
Step 700
700
#325FA5
oklch(49% 0.123 259)
-
Step 800
800 (this color)
#2F538B
oklch(44.4% 0.101 258.9)
-
Step 900
900
#27416B
oklch(37.6% 0.079 259.6)
-
Step 950
950
#17273F
oklch(27.2% 0.05 258.3)
#2F538B 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) | #3A588D | 0.021 |
| Deuteranopia (no green cones) | #2D4F8A | 0.012 |
| Tritanopia (no blue cones) | #006068 | 0.084 |
| Achromatopsia (no color) | #535353 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F538B
#2F538B
oklch(44.4% 0.101 258.9)
- #6F4C00
#6F4C00
oklch(44.4% 0.092 78.3)
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 #2F538B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.009
- Light Navy Blue #2E5A88 ΔE 0.022
- Light Navy #155084 ΔE 0.027
- Denim Blue #3B5B92 ΔE 0.030
- Deep Sea Blue #015482 ΔE 0.033
- Cobalt #1E488F ΔE 0.039
- Twilight #4E518B ΔE 0.039
- Dusk #4E5481 ΔE 0.043
Use #2F538B 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.