#1F455B
Closest named color: Dark Grey Blue (#29465B). oklch(37.3% 0.057 236.5), rgb(31, 69, 91).
Aa
White text reads best on this color (10.19:1).
About this color
#1F455B is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.057 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.012 away. White text reads best on it, at 10.19:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.06:1 |
| White text | 10.19:1 |
Values
| HEX | #1F455B |
| RGB | rgb(31, 69, 91) |
| HSL | hsl(202, 49%, 24%) |
| OKLCH | oklch(37.3% 0.057 236.5) |
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 #1F455B | 10.19:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #1F455B | 2.06:1 | Fails | Lc 10.4 | Not readable |
| #1F455B text on white | 10.19:1 | AAA | Lc 93.5 | Preferred for body text |
| #1F455B text on black | 2.06:1 | Fails | Lc -9.0 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A7C6D9
oklch(81% 0.043 235)
-
Step 400
400
#77A8C6
oklch(70.8% 0.068 235.9)
-
Step 500
500
#5192B8
oklch(63.2% 0.088 236.1)
-
Step 600
600
#327BA4
oklch(55.5% 0.096 236.8)
-
Step 700
700
#24688C
oklch(49.2% 0.088 235.9)
-
Step 800
800
#205572
oklch(42.8% 0.073 236.1)
-
Step 900
900 (this color)
#1F455B
oklch(37.3% 0.057 236.5)
-
Step 950
950
#142936
oklch(27% 0.036 237.4)
#1F455B 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) | #3B455C | 0.035 |
| Deuteranopia (no green cones) | #323E5B | 0.030 |
| Tritanopia (no blue cones) | #004B4C | 0.042 |
| Achromatopsia (no color) | #414141 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F455B
#1F455B
oklch(37.3% 0.057 236.5)
- #583821
#583821
oklch(37.3% 0.058 55.6)
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 #1F455B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.012
- Charcoal #264653 ΔE 0.016
- Dark Blue Grey #1F3B4D ΔE 0.036
- Dark Teal #014D4E ΔE 0.043
- Midnight Green #073B4C ΔE 0.045
- Dark Slate Gray #2F4F4F ΔE 0.048
- Charcoal Grey #3C4142 ΔE 0.051
- Prussian Blue #1D3557 ΔE 0.052
Use #1F455B 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.