#1B5259
Closest named color: Deep Teal (#00555A). oklch(40.6% 0.057 207), rgb(27, 82, 89).
Aa
White text reads best on this color (8.75:1).
About this color
#1B5259 is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.057 and its hue 207°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Teal (#00555A), ΔE 0.014 away. White text reads best on it, at 8.75:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Deep Teal (#00555A) |
| Black text | 2.39:1 |
| White text | 8.75:1 |
Values
| HEX | #1B5259 |
| RGB | rgb(27, 82, 89) |
| HSL | hsl(187, 53%, 23%) |
| OKLCH | oklch(40.6% 0.057 207) |
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 #1B5259 | 8.75:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #1B5259 | 2.39:1 | Fails | Lc 14.2 | Not readable |
| #1B5259 text on white | 8.75:1 | AAA | Lc 89.8 | Fine for body text |
| #1B5259 text on black | 2.39:1 | Fails | Lc -12.5 | 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 800.
-
Step 50
50
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CCDDDF
oklch(88.5% 0.018 205.3)
-
Step 300
300
#A8C7CC
oklch(80.8% 0.034 208.4)
-
Step 400
400
#79ABB2
oklch(70.8% 0.054 206.9)
-
Step 500
500
#53959E
oklch(63% 0.069 206.9)
-
Step 600
600
#358089
oklch(55.7% 0.074 206.1)
-
Step 700
700
#266C75
oklch(49.2% 0.07 207.1)
-
Step 800
800 (this color)
#1B5259
oklch(40.6% 0.057 207)
-
Step 900
900
#22484E
oklch(37.6% 0.044 208.8)
-
Step 950
950
#152A2D
oklch(26.9% 0.027 207.4)
#1B5259 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) | #4B4F59 | 0.056 |
| Deuteranopia (no green cones) | #424859 | 0.051 |
| Tritanopia (no blue cones) | #005654 | 0.021 |
| Achromatopsia (no color) | #4B4B4B | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5259
#1B5259
oklch(40.6% 0.057 207)
- #653D38
#653D38
oklch(40.6% 0.057 27.6)
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 #1B5259, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Teal #00555A ΔE 0.014
- Dark Slate Gray #2F4F4F ΔE 0.022
- Dark Teal #014D4E ΔE 0.028
- Dark Blue Green #005249 ΔE 0.033
- Charcoal #264653 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.041
- Petrol #005F6A ΔE 0.043
- Dark Green Blue #1F6357 ΔE 0.058
Use #1B5259 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.