#399DE2
Closest named color: Chefchaouen Blue (#4895EF). oklch(67% 0.137 243.2), rgb(57, 157, 226).
Aa
Black text reads best on this color (7.09:1).
About this color
#399DE2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.137 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.033 away. Black text reads best on it, at 7.09:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.09:1 |
| White text | 2.95:1 |
Values
| HEX | #399DE2 |
| RGB | rgb(57, 157, 226) |
| HSL | hsl(204, 74%, 55%) |
| OKLCH | oklch(67% 0.137 243.2) |
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 #399DE2 | 2.95:1 | Fails | Lc -61.1 | Content text, not long reading |
| Black text on #399DE2 | 7.09:1 | AAA | Lc 48.3 | Large or bold text, headings |
| #399DE2 text on white | 2.95:1 | Fails | Lc 55.8 | Large or bold text, headings |
| #399DE2 text on black | 7.09:1 | AAA | Lc -46.0 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DCECFA
oklch(93.5% 0.026 244.4)
-
Step 200
200
#BFDEF7
oklch(88.6% 0.048 242.5)
-
Step 300
300
#90C8F4
oklch(81% 0.085 242.7)
-
Step 400
400 (this color)
#399DE2
oklch(67% 0.137 243.2)
-
Step 500
500
#0091DE
oklch(63.1% 0.153 243.2)
-
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
#002944
oklch(27% 0.066 243.6)
#399DE2 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) | #7D9FE5 | 0.063 |
| Deuteranopia (no green cones) | #668FE1 | 0.049 |
| Tritanopia (no blue cones) | #00AEB5 | 0.096 |
| Achromatopsia (no color) | #969696 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399DE2
#399DE2
oklch(67% 0.137 243.2)
- #CF8029
#CF8029
oklch(67% 0.137 63.2)
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 #399DE2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.033
- Dark Sky Blue #448EE4 ΔE 0.041
- Cornflower Blue #6495ED ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.063
- Soft Blue #6488EA ΔE 0.066
- Faded Blue #658CBB ΔE 0.069
- Water Blue #0E87CC ΔE 0.071
- Cool Blue #4984B8 ΔE 0.082
Use #399DE2 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.