#2F3757
Closest named color: Prussian Blue (#1D3557). oklch(34.5% 0.057 272.4), rgb(47, 55, 87).
Aa
White text reads best on this color (11.63:1).
About this color
#2F3757 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.057 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.026 away. White text reads best on it, at 11.63:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.80:1 |
| White text | 11.63:1 |
Values
| HEX | #2F3757 |
| RGB | rgb(47, 55, 87) |
| HSL | hsl(228, 30%, 26%) |
| OKLCH | oklch(34.5% 0.057 272.4) |
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 #2F3757 | 11.63:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #2F3757 | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #2F3757 text on white | 11.63:1 | AAA | Lc 96.7 | Preferred for body text |
| #2F3757 text on black | 1.80:1 | Fails | Lc 0.0 | Not readable |
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 900.
-
Step 50
50
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D3D9E9
oklch(88.6% 0.023 269.4)
-
Step 300
300
#B7BFDD
oklch(80.8% 0.043 273.6)
-
Step 400
400
#929ECC
oklch(70.6% 0.069 273.2)
-
Step 500
500
#7786BF
oklch(63.1% 0.088 272.4)
-
Step 600
600
#606FAB
oklch(55.6% 0.095 272.3)
-
Step 700
700
#505D93
oklch(49.2% 0.088 272.5)
-
Step 800
800
#414C77
oklch(42.7% 0.073 272.1)
-
Step 900
900 (this color)
#2F3757
oklch(34.5% 0.057 272.4)
-
Step 950
950
#202538
oklch(26.9% 0.036 272.4)
#2F3757 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) | #2C3A58 | 0.010 |
| Deuteranopia (no green cones) | #283756 | 0.010 |
| Tritanopia (no blue cones) | #223D43 | 0.049 |
| Achromatopsia (no color) | #393939 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3757
#2F3757
oklch(34.5% 0.057 272.4)
- #443812
#443812
oklch(34.5% 0.057 91.5)
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 #2F3757, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.033
- Gunmetal #293241 ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.045
- Onyx #343A40 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.047
- Midnight Green #073B4C ΔE 0.048
- Charcoal #264653 ΔE 0.051
Use #2F3757 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.