#1F4E52
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.3% 0.051 202.9), rgb(31, 78, 82).
Aa
White text reads best on this color (9.25:1).
About this color
#1F4E52 is a dark, muted teal or cyan. In OKLCH its lightness is 39%, its chroma 0.051 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.017 away. White text reads best on it, at 9.25:1.
| Hue family | Teals and cyans |
| Lightness | dark (39%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #1F4E52 |
| RGB | rgb(31, 78, 82) |
| HSL | hsl(185, 45%, 22%) |
| OKLCH | oklch(39.3% 0.051 202.9) |
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 #1F4E52 | 9.25:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #1F4E52 | 2.26:1 | Fails | Lc 12.8 | Not readable |
| #1F4E52 text on white | 9.25:1 | AAA | Lc 91.2 | Preferred for body text |
| #1F4E52 text on black | 2.26:1 | Fails | Lc -11.2 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECED
oklch(93.6% 0.011 204.1)
-
Step 200
200
#CADEDF
oklch(88.6% 0.021 200.4)
-
Step 300
300
#A5C8CB
oklch(80.8% 0.038 202.8)
-
Step 400
400
#72ACB1
oklch(70.6% 0.061 202.7)
-
Step 500
500
#48989E
oklch(63.2% 0.078 201.9)
-
Step 600
600
#228289
oklch(55.7% 0.085 202.3)
-
Step 700
700
#126E74
oklch(49.2% 0.079 201.9)
-
Step 800
800
#14595F
oklch(42.6% 0.066 203.7)
-
Step 900
900 (this color)
#1F4E52
oklch(39.3% 0.051 202.9)
-
Step 950
950
#112B2D
oklch(27% 0.032 202.1)
#1F4E52 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) | #484B52 | 0.051 |
| Deuteranopia (no green cones) | #404552 | 0.047 |
| Tritanopia (no blue cones) | #00514F | 0.020 |
| Achromatopsia (no color) | #474747 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4E52
#1F4E52
oklch(39.3% 0.051 202.9)
- #5F3B39
#5F3B39
oklch(39.4% 0.051 23.1)
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 #1F4E52, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.017
- Dark Teal #014D4E ΔE 0.019
- Deep Teal #00555A ΔE 0.024
- Charcoal #264653 ΔE 0.027
- Dark Blue Green #005249 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.050
- Petrol #005F6A ΔE 0.057
Use #1F4E52 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.