#059BBB
Closest named color: Blue NCS (#118AB2). oklch(63.8% 0.115 219.6), rgb(5, 155, 187).
Aa
Black text reads best on this color (6.41:1).
About this color
#059BBB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.115 and its hue 220°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.048 away. Black text reads best on it, at 6.41:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 6.41:1 |
| White text | 3.27:1 |
Values
| HEX | #059BBB |
| RGB | rgb(5, 155, 187) |
| HSL | hsl(191, 95%, 38%) |
| OKLCH | oklch(63.8% 0.115 219.6) |
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 #059BBB | 3.27:1 | AA large text | Lc -64.9 | Content text, not long reading |
| Black text on #059BBB | 6.41:1 | AA | Lc 44.6 | Non-text elements, placeholder text |
| #059BBB text on white | 3.27:1 | AA large text | Lc 59.5 | Large or bold text, headings |
| #059BBB text on black | 6.41:1 | AA | Lc -42.2 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F0F7F9
oklch(97.1% 0.008 216.6)
-
Step 100
100
#DFEDF1
oklch(93.7% 0.016 216.7)
-
Step 200
200
#C3DFE7
oklch(88.6% 0.032 216.8)
-
Step 300
300
#98CADA
oklch(80.9% 0.057 219.5)
-
Step 400
400
#59AEC7
oklch(70.7% 0.09 219.5)
-
Step 500
500 (this color)
#059BBB
oklch(63.8% 0.115 219.6)
-
Step 600
600
#00809C
oklch(55.5% 0.101 220.3)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#022C36
oklch(27.1% 0.047 218.1)
#059BBB 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) | #8796BD | 0.096 |
| Deuteranopia (no green cones) | #7288BB | 0.084 |
| Tritanopia (no blue cones) | #00A5A5 | 0.051 |
| Achromatopsia (no color) | #8E8E8E | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #059BBB
#059BBB
oklch(63.8% 0.115 219.6)
- #C67155
#C67155
oklch(63.7% 0.115 38.9)
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 #059BBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.048
- Teal Green #0A9396 ΔE 0.056
- Sea #3C9992 ΔE 0.062
- Cadet Blue #5F9EA0 ΔE 0.063
- Teal Blue #01889F ΔE 0.063
- Turquoise Blue #06B1C4 ΔE 0.063
- Faded Blue #658CBB ΔE 0.066
- Dusty Blue #5A86AD ΔE 0.067
Use #059BBB 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.