#212537
Closest named color: Oxford Blue (#1B263B). oklch(26.9% 0.034 274.3), rgb(33, 37, 55).
Aa
White text reads best on this color (15.16:1).
About this color
#212537 is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.034 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.011 away. White text reads best on it, at 15.16:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.38:1 |
| White text | 15.16:1 |
Values
| HEX | #212537 |
| RGB | rgb(33, 37, 55) |
| HSL | hsl(229, 25%, 17%) |
| OKLCH | oklch(26.9% 0.034 274.3) |
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 #212537 | 15.16:1 | AAA | Lc -104.8 | Preferred for body text |
| Black text on #212537 | 1.38:1 | Fails | Lc 0.0 | Not readable |
| #212537 text on white | 15.16:1 | AAA | Lc 102.1 | Preferred for body text |
| #212537 text on black | 1.38:1 | 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 950.
-
Step 50
50
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D4D8E8
oklch(88.4% 0.022 274.7)
-
Step 300
300
#B8BFDB
oklch(80.8% 0.04 274.4)
-
Step 400
400
#949ECA
oklch(70.7% 0.065 274.6)
-
Step 500
500
#7A86BC
oklch(63.2% 0.083 274.2)
-
Step 600
600
#636FA8
oklch(55.6% 0.09 274.1)
-
Step 700
700
#525D90
oklch(49.2% 0.083 273.7)
-
Step 800
800
#434C75
oklch(42.7% 0.069 273.7)
-
Step 900
900
#393F5E
oklch(37.6% 0.054 275.1)
-
Step 950
950 (this color)
#212537
oklch(26.9% 0.034 274.3)
#212537 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) | #1F2738 | 0.007 |
| Deuteranopia (no green cones) | #1E2537 | 0.005 |
| Tritanopia (no blue cones) | #1B282B | 0.030 |
| Achromatopsia (no color) | #262626 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #212537
#212537
oklch(26.9% 0.034 274.3)
- #2C2612
#2C2612
oklch(27% 0.034 93.2)
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 #212537, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.011
- Dark #1B2431 ΔE 0.016
- Jet #212529 ΔE 0.027
- Space Cadet #2B2D42 ΔE 0.036
- Gunmetal #293241 ΔE 0.047
- Rich Black #0D1B2A ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.069
- Midnight Green #073B4C ΔE 0.074
Use #212537 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.