#999FEF
Closest named color: Periwinkle Blue (#8F99FB). oklch(72.9% 0.116 279.8), rgb(153, 159, 239).
Aa
Black text reads best on this color (8.56:1).
About this color
#999FEF is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.116 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Periwinkle Blue (#8F99FB), ΔE 0.030 away. Black text reads best on it, at 8.56:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Periwinkle Blue (#8F99FB) |
| Black text | 8.56:1 |
| White text | 2.45:1 |
Values
| HEX | #999FEF |
| RGB | rgb(153, 159, 239) |
| HSL | hsl(236, 73%, 77%) |
| OKLCH | oklch(72.9% 0.116 279.8) |
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 #999FEF | 2.45:1 | Fails | Lc -53.2 | Large or bold text, headings |
| Black text on #999FEF | 8.56:1 | AAA | Lc 55.8 | Large or bold text, headings |
| #999FEF text on white | 2.45:1 | Fails | Lc 48.2 | Large or bold text, headings |
| #999FEF text on black | 8.56:1 | AAA | Lc -53.8 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D3D7F4
oklch(88.5% 0.04 279.3)
-
Step 300
300
#B7BCEF
oklch(80.9% 0.072 280.3)
-
Step 400
400 (this color)
#999FEF
oklch(72.9% 0.116 279.8)
-
Step 500
500
#797CE0
oklch(63% 0.148 279.9)
-
Step 600
600
#6363CE
oklch(55.5% 0.161 279.8)
-
Step 700
700
#5352B2
oklch(49.1% 0.149 279.9)
-
Step 800
800
#444390
oklch(42.6% 0.124 280.4)
-
Step 900
900
#383A73
oklch(37.7% 0.096 279.2)
-
Step 950
950
#212243
oklch(26.9% 0.061 280.2)
#999FEF 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) | #86A9F2 | 0.032 |
| Deuteranopia (no green cones) | #81A2ED | 0.031 |
| Tritanopia (no blue cones) | #81AEBC | 0.101 |
| Achromatopsia (no color) | #A5A5A5 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #999FEF
#999FEF
oklch(72.9% 0.116 279.8)
- #B9A94B
#B9A94B
oklch(73% 0.116 99.7)
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 #999FEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Periwinkle Blue #8F99FB ΔE 0.030
- Perrywinkle #8F8CE7 ΔE 0.052
- Pale Purple #B790D4 ΔE 0.061
- Carolina Blue #8AB8FE ΔE 0.064
- Lavender Blue #8B88F8 ΔE 0.068
- Baby Purple #CA9BF7 ΔE 0.073
- Cornflower Blue #6495ED ΔE 0.073
- Pastel Purple #CAA0FF ΔE 0.076
Use #999FEF 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.