#1F4758
Closest named color: Charcoal (#264653). oklch(37.7% 0.053 228.4), rgb(31, 71, 88).
Aa
White text reads best on this color (9.99:1).
About this color
#1F4758 is a dark, muted teal or cyan. In OKLCH its lightness is 38%, its chroma 0.053 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.010 away. White text reads best on it, at 9.99:1.
| Hue family | Teals and cyans |
| Lightness | dark (38%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 2.10:1 |
| White text | 9.99:1 |
Values
| HEX | #1F4758 |
| RGB | rgb(31, 71, 88) |
| HSL | hsl(198, 48%, 23%) |
| OKLCH | oklch(37.7% 0.053 228.4) |
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 #1F4758 | 9.99:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #1F4758 | 2.10:1 | Fails | Lc 10.9 | Not readable |
| #1F4758 text on white | 9.99:1 | AAA | Lc 93.0 | Preferred for body text |
| #1F4758 text on black | 2.10:1 | Fails | Lc -9.4 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CBDCE5
oklch(88.4% 0.022 230.6)
-
Step 300
300
#A7C6D5
oklch(80.9% 0.04 228.7)
-
Step 400
400
#76A9C0
oklch(70.7% 0.064 227.8)
-
Step 500
500
#4F93B1
oklch(63.1% 0.082 228.8)
-
Step 600
600
#2F7D9C
oklch(55.6% 0.089 228.1)
-
Step 700
700
#216986
oklch(49% 0.083 229.2)
-
Step 800
800
#1E566D
oklch(42.7% 0.069 228.9)
-
Step 900
900 (this color)
#1F4758
oklch(37.7% 0.053 228.4)
-
Step 950
950
#132A34
oklch(27.1% 0.034 228.3)
#1F4758 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) | #3E4659 | 0.039 |
| Deuteranopia (no green cones) | #364058 | 0.033 |
| Tritanopia (no blue cones) | #004C4D | 0.034 |
| Achromatopsia (no color) | #424242 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4758
#1F4758
oklch(37.7% 0.053 228.4)
- #593928
#593928
oklch(37.8% 0.053 48.6)
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 #1F4758, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.010
- Dark Grey Blue #29465B ΔE 0.013
- Dark Teal #014D4E ΔE 0.035
- Dark Slate Gray #2F4F4F ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.040
- Deep Teal #00555A ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.047
- Midnight Green #073B4C ΔE 0.048
Use #1F4758 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.