#0398E8
Closest named color: Chefchaouen Blue (#4895EF). oklch(65.3% 0.158 243.2), rgb(3, 152, 232).
Aa
Black text reads best on this color (6.66:1).
About this color
#0398E8 is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.158 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.031 away. Black text reads best on it, at 6.66:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.66:1 |
| White text | 3.15:1 |
Values
| HEX | #0398E8 |
| RGB | rgb(3, 152, 232) |
| HSL | hsl(201, 97%, 46%) |
| OKLCH | oklch(65.3% 0.158 243.2) |
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 #0398E8 | 3.15:1 | AA large text | Lc -63.3 | Content text, not long reading |
| Black text on #0398E8 | 6.66:1 | AA | Lc 46.1 | Large or bold text, headings |
| #0398E8 text on white | 3.15:1 | AA large text | Lc 57.9 | Large or bold text, headings |
| #0398E8 text on black | 6.66:1 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF8
oklch(93.6% 0.022 243.8)
-
Step 200
200
#C2DDF4
oklch(88.5% 0.043 244)
-
Step 300
300
#95C7EF
oklch(80.9% 0.077 243)
-
Step 400
400
#54A9E7
oklch(70.8% 0.123 242.8)
-
Step 500
500 (this color)
#0398E8
oklch(65.3% 0.158 243.2)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#002943
oklch(27% 0.065 242.6)
#0398E8 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) | #719BEB | 0.069 |
| Deuteranopia (no green cones) | #5389E7 | 0.050 |
| Tritanopia (no blue cones) | #00ACB5 | 0.108 |
| Achromatopsia (no color) | #919191 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0398E8
#0398E8
oklch(65.3% 0.158 243.2)
- #CE7800
#CE7800
oklch(65.3% 0.149 63)
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 #0398E8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.031
- Dark Sky Blue #448EE4 ΔE 0.033
- Dodger Blue #1E90FF ΔE 0.044
- Cornflower Blue #6495ED ΔE 0.054
- Water Blue #0E87CC ΔE 0.058
- Soft Blue #6488EA ΔE 0.064
- Faded Blue #658CBB ΔE 0.081
- Cool Blue #4984B8 ΔE 0.081
Use #0398E8 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.