#2589DD
Closest named color: Dark Sky Blue (#448EE4). oklch(61.6% 0.155 249.2), rgb(37, 137, 221).
Aa
Black text reads best on this color (5.70:1).
About this color
#2589DD is a medium-dark, vivid blue. In OKLCH its lightness is 62%, its chroma 0.155 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.028 away. Black text reads best on it, at 5.70:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.70:1 |
| White text | 3.68:1 |
Values
| HEX | #2589DD |
| RGB | rgb(37, 137, 221) |
| HSL | hsl(207, 73%, 51%) |
| OKLCH | oklch(61.6% 0.155 249.2) |
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 #2589DD | 3.68:1 | AA large text | Lc -69.4 | Content text, not long reading |
| Black text on #2589DD | 5.70:1 | AA | Lc 40.2 | Non-text elements, placeholder text |
| #2589DD text on white | 3.68:1 | AA large text | Lc 63.9 | Content text, not long reading |
| #2589DD text on black | 5.70:1 | AA | Lc -37.7 | 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
#DFEBF8
oklch(93.5% 0.022 250.2)
-
Step 200
200
#C5DCF4
oklch(88.5% 0.041 249.4)
-
Step 300
300
#9BC5F0
oklch(80.9% 0.076 249.4)
-
Step 400
400
#61A6E9
oklch(70.8% 0.121 249.2)
-
Step 500
500 (this color)
#2589DD
oklch(61.6% 0.155 249.2)
-
Step 600
600
#0076C8
oklch(55.5% 0.154 249.2)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#054374
oklch(37.6% 0.101 249.5)
-
Step 950
950
#082844
oklch(27% 0.064 249)
#2589DD 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) | #608EE0 | 0.050 |
| Deuteranopia (no green cones) | #447EDB | 0.032 |
| Tritanopia (no blue cones) | #009DA8 | 0.112 |
| Achromatopsia (no color) | #858585 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2589DD
#2589DD
oklch(61.6% 0.155 249.2)
- #B87400
#B87400
oklch(61.7% 0.134 69.4)
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 #2589DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.028
- Water Blue #0E87CC ΔE 0.028
- Chefchaouen Blue #4895EF ΔE 0.049
- Dodger Blue #1E90FF ΔE 0.052
- Soft Blue #6488EA ΔE 0.056
- Cool Blue #4984B8 ΔE 0.057
- Windows Blue #3778BF ΔE 0.058
- Steel Blue #4682B4 ΔE 0.063
Use #2589DD 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.