#3099DB
Closest named color: Dark Sky Blue (#448EE4). oklch(65.4% 0.135 241.5), rgb(48, 153, 219).
Aa
Black text reads best on this color (6.70:1).
About this color
#3099DB is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.135 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.037 away. Black text reads best on it, at 6.70:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.70:1 |
| White text | 3.13:1 |
Values
| HEX | #3099DB |
| RGB | rgb(48, 153, 219) |
| HSL | hsl(203, 70%, 52%) |
| OKLCH | oklch(65.4% 0.135 241.5) |
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 #3099DB | 3.13:1 | AA large text | Lc -63.4 | Content text, not long reading |
| Black text on #3099DB | 6.70:1 | AA | Lc 46.1 | Large or bold text, headings |
| #3099DB text on white | 3.13:1 | AA large text | Lc 58.0 | Large or bold text, headings |
| #3099DB text on black | 6.70:1 | AA | Lc -43.8 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C5DDF0
oklch(88.6% 0.037 241.8)
-
Step 300
300
#9BC7E8
oklch(81% 0.066 241)
-
Step 400
400
#60A9DD
oklch(70.8% 0.106 241.4)
-
Step 500
500 (this color)
#3099DB
oklch(65.4% 0.135 241.5)
-
Step 600
600
#007AB8
oklch(55.5% 0.131 241.7)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005480
oklch(42.6% 0.1 241.3)
-
Step 900
900
#01466C
oklch(37.7% 0.088 241.7)
-
Step 950
950
#07293F
oklch(26.9% 0.056 241.9)
#3099DB 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) | #7A9ADE | 0.066 |
| Deuteranopia (no green cones) | #638ADA | 0.053 |
| Tritanopia (no blue cones) | #00A9B0 | 0.091 |
| Achromatopsia (no color) | #919191 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3099DB
#3099DB
oklch(65.4% 0.135 241.5)
- #CA7B28
#CA7B28
oklch(65.4% 0.135 61.9)
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 #3099DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.037
- Chefchaouen Blue #4895EF ΔE 0.038
- Cornflower Blue #6495ED ΔE 0.052
- Water Blue #0E87CC ΔE 0.056
- Faded Blue #658CBB ΔE 0.061
- Dodger Blue #1E90FF ΔE 0.064
- Soft Blue #6488EA ΔE 0.066
- Cool Blue #4984B8 ΔE 0.069
Use #3099DB 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.