#1F2637
Closest named color: Oxford Blue (#1B263B). oklch(27% 0.033 266.9), rgb(31, 38, 55).
Aa
White text reads best on this color (15.10:1).
About this color
#1F2637 is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.033 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.009 away. White text reads best on it, at 15.10:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.39:1 |
| White text | 15.10:1 |
Values
| HEX | #1F2637 |
| RGB | rgb(31, 38, 55) |
| HSL | hsl(223, 28%, 17%) |
| OKLCH | oklch(27% 0.033 266.9) |
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 #1F2637 | 15.10:1 | AAA | Lc -104.7 | Preferred for body text |
| Black text on #1F2637 | 1.39:1 | Fails | Lc 0.0 | Not readable |
| #1F2637 text on white | 15.10:1 | AAA | Lc 102.0 | Preferred for body text |
| #1F2637 text on black | 1.39:1 | 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
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E8
oklch(88.4% 0.022 265.8)
-
Step 300
300
#B5C0DB
oklch(80.8% 0.04 267.9)
-
Step 400
400
#8FA0C9
oklch(70.7% 0.063 267.2)
-
Step 500
500
#7388BB
oklch(63% 0.081 266.9)
-
Step 600
600
#5C71A7
oklch(55.5% 0.088 267.3)
-
Step 700
700
#4C5F8F
oklch(49.1% 0.081 267)
-
Step 800
800
#3E4E74
oklch(42.8% 0.067 266.2)
-
Step 900
900
#35415E
oklch(37.8% 0.052 266.7)
-
Step 950
950 (this color)
#1F2637
oklch(27% 0.033 266.9)
#1F2637 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) | #202738 | 0.004 |
| Deuteranopia (no green cones) | #1E2537 | 0.004 |
| Tritanopia (no blue cones) | #18292C | 0.029 |
| Achromatopsia (no color) | #262626 | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F2637
#1F2637
oklch(27% 0.033 266.9)
- #2D2513
#2D2513
oklch(26.8% 0.032 86.3)
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 #1F2637, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.009
- Dark #1B2431 ΔE 0.014
- Jet #212529 ΔE 0.026
- Space Cadet #2B2D42 ΔE 0.036
- Gunmetal #293241 ΔE 0.046
- Rich Black #0D1B2A ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.068
- Midnight Green #073B4C ΔE 0.071
Use #1F2637 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.