#1288DA
Closest named color: Water Blue (#0E87CC). oklch(60.9% 0.155 247.1), rgb(18, 136, 218).
Aa
Black text reads best on this color (5.55:1).
About this color
#1288DA is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.155 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.022 away. Black text reads best on it, at 5.55:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.55:1 |
| White text | 3.77:1 |
Values
| HEX | #1288DA |
| RGB | rgb(18, 136, 218) |
| HSL | hsl(205, 85%, 46%) |
| OKLCH | oklch(60.9% 0.155 247.1) |
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 #1288DA | 3.77:1 | AA large text | Lc -70.2 | Content text, not long reading |
| Black text on #1288DA | 5.55:1 | AA | Lc 39.4 | Non-text elements, placeholder text |
| #1288DA text on white | 3.77:1 | AA large text | Lc 64.7 | Content text, not long reading |
| #1288DA text on black | 5.55:1 | AA | Lc -37.0 | Non-text elements, placeholder 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 500.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C4DCF4
oklch(88.4% 0.042 248.3)
-
Step 300
300
#99C6F0
oklch(80.9% 0.076 247)
-
Step 400
400
#5DA7E8
oklch(70.8% 0.121 247)
-
Step 500
500 (this color)
#1288DA
oklch(60.9% 0.155 247.1)
-
Step 600
600
#0078C3
oklch(55.7% 0.146 246.8)
-
Step 700
700
#0064A5
oklch(49% 0.13 247.2)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#004473
oklch(37.7% 0.1 247.4)
-
Step 950
950
#052844
oklch(26.9% 0.065 247.5)
#1288DA 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) | #608CDD | 0.056 |
| Deuteranopia (no green cones) | #427CD8 | 0.037 |
| Tritanopia (no blue cones) | #009CA6 | 0.111 |
| Achromatopsia (no color) | #838383 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1288DA
#1288DA
oklch(60.9% 0.155 247.1)
- #B77000
#B77000
oklch(60.8% 0.134 67.1)
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 #1288DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.022
- Dark Sky Blue #448EE4 ΔE 0.037
- Windows Blue #3778BF ΔE 0.054
- Cool Blue #4984B8 ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.058
- Steel Blue #4682B4 ΔE 0.060
- Blue NCS #118AB2 ΔE 0.064
Use #1288DA 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.