#1289CF
Closest named color: Water Blue (#0E87CC). oklch(60.5% 0.142 243), rgb(18, 137, 207).
Aa
Black text reads best on this color (5.50:1).
About this color
#1289CF is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.142 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.007 away. Black text reads best on it, at 5.50:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.50:1 |
| White text | 3.81:1 |
Values
| HEX | #1289CF |
| RGB | rgb(18, 137, 207) |
| HSL | hsl(202, 84%, 44%) |
| OKLCH | oklch(60.5% 0.142 243) |
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 #1289CF | 3.81:1 | AA large text | Lc -70.6 | Content text, not long reading |
| Black text on #1289CF | 5.50:1 | AA | Lc 39.0 | Non-text elements, placeholder text |
| #1289CF text on white | 3.81:1 | AA large text | Lc 65.1 | Content text, not long reading |
| #1289CF text on black | 5.50:1 | AA | Lc -36.6 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C4DDF1
oklch(88.5% 0.038 242.2)
-
Step 300
300
#9AC7EA
oklch(81% 0.069 242.1)
-
Step 400
400
#5EA8E0
oklch(70.7% 0.111 243.1)
-
Step 500
500 (this color)
#1289CF
oklch(60.5% 0.142 243)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#00466E
oklch(37.8% 0.091 242.8)
-
Step 950
950
#062941
oklch(27% 0.059 243.6)
#1289CF 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) | #678BD2 | 0.063 |
| Deuteranopia (no green cones) | #4E7BCE | 0.048 |
| Tritanopia (no blue cones) | #009AA2 | 0.096 |
| Achromatopsia (no color) | #838383 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1289CF
#1289CF
oklch(60.5% 0.142 243)
- #BA6C00
#BA6C00
oklch(60.5% 0.138 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 #1289CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.007
- Cool Blue #4984B8 ΔE 0.043
- Dark Sky Blue #448EE4 ΔE 0.045
- Steel Blue #4682B4 ΔE 0.046
- Blue NCS #118AB2 ΔE 0.046
- Windows Blue #3778BF ΔE 0.048
- Nice Blue #107AB0 ΔE 0.059
- Off Blue #5684AE ΔE 0.061
Use #1289CF 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.