#3BB4FD
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.6% 0.148 240.3), rgb(59, 180, 253).
Aa
Black text reads best on this color (9.13:1).
About this color
#3BB4FD is a medium-light, vivid blue. In OKLCH its lightness is 74%, its chroma 0.148 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.030 away. Black text reads best on it, at 9.13:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.13:1 |
| White text | 2.29:1 |
Values
| HEX | #3BB4FD |
| RGB | rgb(59, 180, 253) |
| HSL | hsl(203, 98%, 61%) |
| OKLCH | oklch(73.6% 0.148 240.3) |
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 #3BB4FD | 2.29:1 | Fails | Lc -49.8 | Large or bold text, headings |
| Black text on #3BB4FD | 9.13:1 | AAA | Lc 59.0 | Large or bold text, headings |
| #3BB4FD text on white | 2.29:1 | Fails | Lc 44.9 | Non-text elements, placeholder text |
| #3BB4FD text on black | 9.13:1 | AAA | Lc -57.2 | 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 400.
-
Step 50
50
#EEF7FD
oklch(97.1% 0.013 236.6)
-
Step 100
100
#DBEDFA
oklch(93.7% 0.026 239.1)
-
Step 200
200
#BBDEF8
oklch(88.4% 0.052 240.3)
-
Step 300
300
#88C9F7
oklch(80.9% 0.093 240.2)
-
Step 400
400 (this color)
#3BB4FD
oklch(73.6% 0.148 240.3)
-
Step 500
500
#0092D8
oklch(63% 0.146 240.6)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950
#002941
oklch(26.8% 0.062 240.6)
#3BB4FD 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) | #92B5FF | 0.076 |
| Deuteranopia (no green cones) | #77A3FC | 0.060 |
| Tritanopia (no blue cones) | #00C6CE | 0.098 |
| Achromatopsia (no color) | #ABABAB | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3BB4FD
#3BB4FD
oklch(73.6% 0.148 240.3)
- #EC9139
#EC9139
oklch(73.7% 0.148 60.5)
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 #3BB4FD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.030
- Bright Sky Blue #02CCFE ΔE 0.065
- Vivid Sky Blue #4CC9F0 ΔE 0.068
- Carolina Blue #8AB8FE ΔE 0.068
- Lightblue #7BC8F6 ΔE 0.080
- Chefchaouen Blue #4895EF ΔE 0.081
- Cornflower Blue #6495ED ΔE 0.081
- Sky #82CAFC ΔE 0.088
Use #3BB4FD 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.