#00A3EF
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.2% 0.157 240.1), rgb(0, 163, 239).
Aa
Black text reads best on this color (7.48:1).
About this color
#00A3EF is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.157 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.042 away. Black text reads best on it, at 7.48:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.48:1 |
| White text | 2.80:1 |
Values
| HEX | #00A3EF |
| RGB | rgb(0, 163, 239) |
| HSL | hsl(199, 100%, 47%) |
| OKLCH | oklch(68.2% 0.157 240.1) |
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 #00A3EF | 2.80:1 | Fails | Lc -58.5 | Large or bold text, headings |
| Black text on #00A3EF | 7.48:1 | AAA | Lc 50.8 | Large or bold text, headings |
| #00A3EF text on white | 2.80:1 | Fails | Lc 53.2 | Large or bold text, headings |
| #00A3EF text on black | 7.48:1 | AAA | Lc -48.6 | Large or bold text, headings |
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 400.
-
Step 50
50
#EEF7FE
oklch(97.1% 0.013 241)
-
Step 100
100
#DAEDFB
oklch(93.6% 0.028 239.7)
-
Step 200
200
#BADFFA
oklch(88.6% 0.054 239.9)
-
Step 300
300
#84C9FA
oklch(80.8% 0.098 240.5)
-
Step 400
400 (this color)
#00A3EF
oklch(68.2% 0.157 240.1)
-
Step 500
500
#0092D7
oklch(63% 0.145 240.3)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466A
oklch(37.6% 0.086 240.1)
-
Step 950
950
#002A41
oklch(27.1% 0.061 239)
#00A3EF 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) | #7EA4F2 | 0.078 |
| Deuteranopia (no green cones) | #6192EE | 0.060 |
| Tritanopia (no blue cones) | #00B6BE | 0.103 |
| Achromatopsia (no color) | #9A9A9A | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00A3EF
#00A3EF
oklch(68.2% 0.157 240.1)
- #DD7E0E
#DD7E0E
oklch(68.3% 0.156 60.4)
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 #00A3EF, closest first.
No curated palette has a color within ΔE 0.04 of #00A3EF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.056
- Cornflower Blue #6495ED ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.060
- Deep Sky Blue #00BFFF ΔE 0.077
- Soft Blue #6488EA ΔE 0.080
- Turquoise Blue #06B1C4 ΔE 0.085
- Water Blue #0E87CC ΔE 0.086
Use #00A3EF 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.