#009CDD
Closest named color: Chefchaouen Blue (#4895EF). oklch(65.6% 0.143 237.1), rgb(0, 156, 221).
Aa
Black text reads best on this color (6.79:1).
About this color
#009CDD is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.143 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.046 away. Black text reads best on it, at 6.79:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.79:1 |
| White text | 3.08:1 |
Values
| HEX | #009CDD |
| RGB | rgb(0, 156, 221) |
| HSL | hsl(198, 100%, 43%) |
| OKLCH | oklch(65.6% 0.143 237.1) |
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 #009CDD | 3.08:1 | AA large text | Lc -62.5 | Content text, not long reading |
| Black text on #009CDD | 6.79:1 | AA | Lc 46.9 | Large or bold text, headings |
| #009CDD text on white | 3.08:1 | AA large text | Lc 57.1 | Large or bold text, headings |
| #009CDD text on black | 6.79:1 | AA | Lc -44.6 | 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
#53ABDE
oklch(70.8% 0.113 236.8)
-
Step 500
500 (this color)
#009CDD
oklch(65.6% 0.143 237.1)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#009CDD 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) | #7C9CE0 | 0.080 |
| Deuteranopia (no green cones) | #628BDC | 0.064 |
| Tritanopia (no blue cones) | #00ADB3 | 0.091 |
| Achromatopsia (no color) | #939393 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #009CDD
#009CDD
oklch(65.6% 0.143 237.1)
- #D17726
#D17726
oklch(65.6% 0.143 57.2)
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 #009CDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.046
- Water Blue #0E87CC ΔE 0.060
- Cornflower Blue #6495ED ΔE 0.063
- Dodger Blue #1E90FF ΔE 0.066
- Faded Blue #658CBB ΔE 0.073
- Blue NCS #118AB2 ΔE 0.074
- Cool Blue #4984B8 ΔE 0.077
Use #009CDD 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.