#0099DA
Closest named color: Dark Sky Blue (#448EE4). oklch(64.8% 0.143 237.5), rgb(0, 153, 218).
Aa
Black text reads best on this color (6.56:1).
About this color
#0099DA is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.143 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.043 away. Black text reads best on it, at 6.56:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.56:1 |
| White text | 3.19:1 |
Values
| HEX | #0099DA |
| RGB | rgb(0, 153, 218) |
| HSL | hsl(198, 100%, 43%) |
| OKLCH | oklch(64.8% 0.143 237.5) |
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 #0099DA | 3.19:1 | AA large text | Lc -63.9 | Content text, not long reading |
| Black text on #0099DA | 6.56:1 | AA | Lc 45.6 | Large or bold text, headings |
| #0099DA text on white | 3.19:1 | AA large text | Lc 58.5 | Large or bold text, headings |
| #0099DA text on black | 6.56:1 | AA | Lc -43.3 | 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
#F0F7FB
oklch(97.2% 0.009 232.4)
-
Step 100
100
#DEECF6
oklch(93.6% 0.02 238.7)
-
Step 200
200
#C2DEF0
oklch(88.6% 0.039 236.1)
-
Step 300
300
#96C8E9
oklch(80.9% 0.07 237.7)
-
Step 400
400
#55AADE
oklch(70.6% 0.112 238.1)
-
Step 500
500 (this color)
#0099DA
oklch(64.8% 0.143 237.5)
-
Step 600
600
#007CB2
oklch(55.6% 0.123 237.7)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#004768
oklch(37.7% 0.083 237.5)
-
Step 950
950
#012A3F
oklch(27% 0.058 237)
#0099DA 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) | #7999DD | 0.078 |
| Deuteranopia (no green cones) | #5F88D9 | 0.063 |
| Tritanopia (no blue cones) | #00AAB0 | 0.091 |
| Achromatopsia (no color) | #909090 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0099DA
#0099DA
oklch(64.8% 0.143 237.5)
- #CE7523
#CE7523
oklch(64.9% 0.143 57.5)
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 #0099DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.043
- Chefchaouen Blue #4895EF ΔE 0.047
- Water Blue #0E87CC ΔE 0.051
- Cornflower Blue #6495ED ΔE 0.064
- Dodger Blue #1E90FF ΔE 0.066
- Blue NCS #118AB2 ΔE 0.067
- Faded Blue #658CBB ΔE 0.069
- Cool Blue #4984B8 ΔE 0.069
Use #0099DA 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.