#1B5D4E
Closest named color: Dark Green Blue (#1F6357). oklch(43.3% 0.07 174.6), rgb(27, 93, 78).
Aa
White text reads best on this color (7.71:1).
About this color
#1B5D4E is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 43%, its chroma 0.070 and its hue 175°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.022 away. White text reads best on it, at 7.71:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.72:1 |
| White text | 7.71:1 |
Values
| HEX | #1B5D4E |
| RGB | rgb(27, 93, 78) |
| HSL | hsl(166, 55%, 24%) |
| OKLCH | oklch(43.3% 0.07 174.6) |
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 #1B5D4E | 7.71:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #1B5D4E | 2.72:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #1B5D4E text on white | 7.71:1 | AAA | Lc 86.5 | Fine for body text |
| #1B5D4E text on black | 2.72:1 | Fails | Lc -15.6 | Dividers and decoration only |
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 800.
-
Step 50
50
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E2EDE9
oklch(93.7% 0.013 172.4)
-
Step 200
200
#CBDED8
oklch(88.5% 0.022 174.9)
-
Step 300
300
#A6CABF
oklch(81% 0.041 174.7)
-
Step 400
400
#74AE9E
oklch(70.6% 0.065 175.1)
-
Step 500
500
#4C9A86
oklch(63.1% 0.084 174.6)
-
Step 600
600
#298570
oklch(55.7% 0.091 174.4)
-
Step 700
700
#19705E
oklch(49.1% 0.084 175.2)
-
Step 800
800 (this color)
#1B5D4E
oklch(43.3% 0.07 174.6)
-
Step 900
900
#1C4B40
oklch(37.7% 0.055 175.4)
-
Step 950
950
#122C25
oklch(27% 0.035 173.9)
#1B5D4E 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) | #5A574D | 0.074 |
| Deuteranopia (no green cones) | #50504F | 0.070 |
| Tritanopia (no blue cones) | #005E59 | 0.018 |
| Achromatopsia (no color) | #535353 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5D4E
#1B5D4E
oklch(43.3% 0.07 174.6)
- #6F4053
#6F4053
oklch(43.4% 0.07 354.7)
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 #1B5D4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.022
- Spruce #0A5F38 ΔE 0.039
- Pine #2B5D34 ΔE 0.039
- Dark Blue Green #005249 ΔE 0.040
- Deep Teal #00555A ΔE 0.040
- Petrol #005F6A ΔE 0.045
- Dark Slate Gray #2F4F4F ΔE 0.048
- Dark Aqua #05696B ΔE 0.050
Use #1B5D4E 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.