#3FAAF4
Closest named color: Deep Sky Blue (#00BFFF). oklch(71% 0.145 243.2), rgb(63, 170, 244).
Aa
Black text reads best on this color (8.26:1).
About this color
#3FAAF4 is a medium-light, vivid blue. In OKLCH its lightness is 71%, its chroma 0.145 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.055 away. Black text reads best on it, at 8.26:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.26:1 |
| White text | 2.54:1 |
Values
| HEX | #3FAAF4 |
| RGB | rgb(63, 170, 244) |
| HSL | hsl(205, 89%, 60%) |
| OKLCH | oklch(71% 0.145 243.2) |
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 #3FAAF4 | 2.54:1 | Fails | Lc -54.5 | Large or bold text, headings |
| Black text on #3FAAF4 | 8.26:1 | AAA | Lc 54.6 | Large or bold text, headings |
| #3FAAF4 text on white | 2.54:1 | Fails | Lc 49.4 | Large or bold text, headings |
| #3FAAF4 text on black | 8.26:1 | AAA | Lc -52.6 | 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
#BDDEF8
oklch(88.5% 0.05 241.9)
-
Step 300
300
#8DC8F7
oklch(81% 0.09 243.2)
-
Step 400
400 (this color)
#3FAAF4
oklch(71% 0.145 243.2)
-
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)
#3FAAF4 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) | #88ACF7 | 0.067 |
| Deuteranopia (no green cones) | #6F9BF3 | 0.051 |
| Tritanopia (no blue cones) | #00BCC4 | 0.101 |
| Achromatopsia (no color) | #A2A2A2 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3FAAF4
#3FAAF4
oklch(71% 0.145 243.2)
- #E08B2E
#E08B2E
oklch(71.1% 0.145 63.1)
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 #3FAAF4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.055
- Chefchaouen Blue #4895EF ΔE 0.055
- Cornflower Blue #6495ED ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.075
- Dodger Blue #1E90FF ΔE 0.079
- Carolina Blue #8AB8FE ΔE 0.082
- Turquoise Blue #06B1C4 ΔE 0.084
- Periwinkle Blue #8F99FB ΔE 0.086
Use #3FAAF4 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.