#3D99EB
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.7% 0.149 249), rgb(61, 153, 235).
Aa
Black text reads best on this color (6.95:1).
About this color
#3D99EB is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.149 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.015 away. Black text reads best on it, at 6.95:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.95:1 |
| White text | 3.01:1 |
Values
| HEX | #3D99EB |
| RGB | rgb(61, 153, 235) |
| HSL | hsl(208, 81%, 58%) |
| OKLCH | oklch(66.7% 0.149 249) |
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 #3D99EB | 3.01:1 | AA large text | Lc -61.9 | Content text, not long reading |
| Black text on #3D99EB | 6.95:1 | AA | Lc 47.5 | Large or bold text, headings |
| #3D99EB text on white | 3.01:1 | AA large text | Lc 56.6 | Large or bold text, headings |
| #3D99EB text on black | 6.95:1 | AA | Lc -45.2 | 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 500.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#DFEBF8
oklch(93.5% 0.022 250.2)
-
Step 200
200
#C5DCF3
oklch(88.5% 0.04 248.3)
-
Step 300
300
#9CC5EE
oklch(80.8% 0.073 248.7)
-
Step 400
400
#63A6E6
oklch(70.7% 0.117 248.8)
-
Step 500
500 (this color)
#3D99EB
oklch(66.7% 0.149 249)
-
Step 600
600
#0076C8
oklch(55.5% 0.154 249.2)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#094472
oklch(37.8% 0.096 248.5)
-
Step 950
950
#092843
oklch(27% 0.062 248.7)
#3D99EB 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) | #739DEE | 0.052 |
| Deuteranopia (no green cones) | #5A8DE9 | 0.036 |
| Tritanopia (no blue cones) | #00ADB7 | 0.111 |
| Achromatopsia (no color) | #949494 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D99EB
#3D99EB
oklch(66.7% 0.149 249)
- #CD8100
#CD8100
oklch(66.7% 0.146 68.9)
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 #3D99EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.015
- Dark Sky Blue #448EE4 ΔE 0.029
- Cornflower Blue #6495ED ΔE 0.033
- Dodger Blue #1E90FF ΔE 0.045
- Soft Blue #6488EA ΔE 0.051
- Water Blue #0E87CC ΔE 0.070
- Faded Blue #658CBB ΔE 0.076
- Cool Blue #4984B8 ΔE 0.086
Use #3D99EB 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.