#81A3FB
Closest named color: Periwinkle Blue (#8F99FB). oklch(72.7% 0.134 267), rgb(129, 163, 251).
Aa
Black text reads best on this color (8.56:1).
About this color
#81A3FB is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.134 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Periwinkle Blue (#8F99FB), ΔE 0.029 away. Black text reads best on it, at 8.56:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Periwinkle Blue (#8F99FB) |
| Black text | 8.56:1 |
| White text | 2.45:1 |
Values
| HEX | #81A3FB |
| RGB | rgb(129, 163, 251) |
| HSL | hsl(223, 94%, 75%) |
| OKLCH | oklch(72.7% 0.134 267) |
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 #81A3FB | 2.45:1 | Fails | Lc -53.1 | Large or bold text, headings |
| Black text on #81A3FB | 8.56:1 | AAA | Lc 55.9 | Large or bold text, headings |
| #81A3FB text on white | 2.45:1 | Fails | Lc 48.1 | Large or bold text, headings |
| #81A3FB text on black | 8.56:1 | AAA | Lc -53.9 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CBD9F9
oklch(88.5% 0.047 266.7)
-
Step 300
300
#A8C0F8
oklch(81% 0.084 266.5)
-
Step 400
400 (this color)
#81A3FB
oklch(72.7% 0.134 267)
-
Step 500
500
#5B81F0
oklch(63.1% 0.172 267.2)
-
Step 600
600
#4368DE
oklch(55.7% 0.185 267)
-
Step 700
700
#3555C1
oklch(49% 0.173 267.2)
-
Step 800
800
#2C479C
oklch(42.8% 0.142 266.9)
-
Step 900
900
#273C7C
oklch(37.6% 0.112 267.2)
-
Step 950
950
#172449
oklch(27.1% 0.071 267.1)
#81A3FB 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) | #81ABFF | 0.021 |
| Deuteranopia (no green cones) | #74A0F9 | 0.018 |
| Tritanopia (no blue cones) | #4DB6C3 | 0.121 |
| Achromatopsia (no color) | #A5A5A5 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #81A3FB
#81A3FB
oklch(72.7% 0.134 267)
- #CBA02F
#CBA02F
oklch(72.7% 0.134 86.7)
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 #81A3FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Periwinkle Blue #8F99FB ΔE 0.029
- Cornflower Blue #6495ED ΔE 0.055
- Carolina Blue #8AB8FE ΔE 0.057
- Perrywinkle #8F8CE7 ΔE 0.060
- Lavender Blue #8B88F8 ΔE 0.068
- Chefchaouen Blue #4895EF ΔE 0.074
- Soft Blue #6488EA ΔE 0.083
- Periwinkle #8E82FE ΔE 0.084
Use #81A3FB 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.