#2399E2
Closest named color: Chefchaouen Blue (#4895EF). oklch(65.6% 0.146 242.6), rgb(35, 153, 226).
Aa
Black text reads best on this color (6.72:1).
About this color
#2399E2 is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.146 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.032 away. Black text reads best on it, at 6.72:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.72:1 |
| White text | 3.12:1 |
Values
| HEX | #2399E2 |
| RGB | rgb(35, 153, 226) |
| HSL | hsl(203, 77%, 51%) |
| OKLCH | oklch(65.6% 0.146 242.6) |
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 #2399E2 | 3.12:1 | AA large text | Lc -63.1 | Content text, not long reading |
| Black text on #2399E2 | 6.72:1 | AA | Lc 46.3 | Large or bold text, headings |
| #2399E2 text on white | 3.12:1 | AA large text | Lc 57.7 | Large or bold text, headings |
| #2399E2 text on black | 6.72:1 | AA | Lc -44.0 | 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
#DEECF7
oklch(93.6% 0.021 241.4)
-
Step 200
200
#C3DDF2
oklch(88.5% 0.04 242.4)
-
Step 300
300
#98C7EC
oklch(80.9% 0.072 242.5)
-
Step 400
400
#5AA9E2
oklch(70.8% 0.114 242.1)
-
Step 500
500 (this color)
#2399E2
oklch(65.6% 0.146 242.6)
-
Step 600
600
#007ABA
oklch(55.6% 0.133 242.5)
-
Step 700
700
#00669D
oklch(49% 0.118 242.7)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#00466D
oklch(37.8% 0.09 242.2)
-
Step 950
950
#042941
oklch(27% 0.06 242.6)
#2399E2 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) | #769BE5 | 0.067 |
| Deuteranopia (no green cones) | #5C8AE1 | 0.051 |
| Tritanopia (no blue cones) | #00ABB3 | 0.100 |
| Achromatopsia (no color) | #929292 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2399E2
#2399E2
oklch(65.6% 0.146 242.6)
- #CE7910
#CE7910
oklch(65.5% 0.146 62.5)
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 #2399E2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.032
- Dark Sky Blue #448EE4 ΔE 0.033
- Cornflower Blue #6495ED ΔE 0.051
- Dodger Blue #1E90FF ΔE 0.054
- Water Blue #0E87CC ΔE 0.057
- Soft Blue #6488EA ΔE 0.064
- Faded Blue #658CBB ΔE 0.071
- Cool Blue #4984B8 ΔE 0.075
Use #2399E2 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.