#ECF3FF
Closest named color: Anti-Flash White (#EDF2F4). oklch(96.2% 0.018 261.3), rgb(236, 243, 255).
Aa
Black text reads best on this color (18.83:1).
About this color
#ECF3FF is a very light close to neutral grey. In OKLCH its lightness is 96%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Anti-Flash White (#EDF2F4), ΔE 0.014 away. Black text reads best on it, at 18.83:1.
| Hue family | Neutrals |
| Lightness | very light (96%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Anti-Flash White (#EDF2F4) |
| Black text | 18.83:1 |
| White text | 1.11:1 |
Values
| HEX | #ECF3FF |
| RGB | rgb(236, 243, 255) |
| HSL | hsl(218, 100%, 96%) |
| OKLCH | oklch(96.2% 0.018 261.3) |
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 #ECF3FF | 1.11:1 | Fails | Lc 0.0 | Not readable |
| Black text on #ECF3FF | 18.83:1 | AAA | Lc 98.6 | Preferred for body text |
| #ECF3FF text on white | 1.11:1 | Fails | Lc 0.0 | Not readable |
| #ECF3FF text on black | 18.83:1 | AAA | Lc -99.6 | Preferred for body text |
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 50.
-
Step 50
50 (this color)
#ECF3FF
oklch(96.2% 0.018 261.3)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4D9E2
oklch(88.4% 0.013 262.4)
-
Step 300
300
#B8C1D0
oklch(80.9% 0.023 260.7)
-
Step 400
400
#94A1B8
oklch(70.6% 0.037 261.9)
-
Step 500
500
#7A8AA6
oklch(63.1% 0.046 261.6)
-
Step 600
600
#637492
oklch(55.7% 0.051 261.7)
-
Step 700
700
#52617C
oklch(49.1% 0.047 262)
-
Step 800
800
#434F65
oklch(42.6% 0.04 262.4)
-
Step 900
900
#394252
oklch(37.8% 0.03 261.9)
-
Step 950
950
#212730
oklch(27.1% 0.019 258.4)
#ECF3FF 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) | #EFF3FF | 0.004 |
| Deuteranopia (no green cones) | #EEF2FF | 0.003 |
| Tritanopia (no blue cones) | #E8F5F7 | 0.015 |
| Achromatopsia (no color) | #F2F2F2 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #ECF3FF
#ECF3FF
oklch(96.2% 0.018 261.3)
- #F9F2E6
#F9F2E6
oklch(96.3% 0.018 81.3)
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 #ECF3FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Anti-Flash White #EDF2F4 ΔE 0.014
- Alice Blue #F0F8FF ΔE 0.014
- White Smoke #F5F5F5 ΔE 0.019
- Ghost White #F8F8FF ΔE 0.021
- Cultured #F8F9FA ΔE 0.025
- Lavender Blush #FFF0F5 ΔE 0.026
- Very Light Pink #FFF4F2 ΔE 0.030
- Azure #F0FFFF ΔE 0.032
Use #ECF3FF 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.