#1588BF
Closest named color: Water Blue (#0E87CC). oklch(59.5% 0.125 237.1), rgb(21, 136, 191).
Aa
Black text reads best on this color (5.30:1).
About this color
#1588BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.125 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.021 away. Black text reads best on it, at 5.30:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.30:1 |
| White text | 3.95:1 |
Values
| HEX | #1588BF |
| RGB | rgb(21, 136, 191) |
| HSL | hsl(199, 80%, 42%) |
| OKLCH | oklch(59.5% 0.125 237.1) |
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 #1588BF | 3.95:1 | AA large text | Lc -71.9 | Content text, not long reading |
| Black text on #1588BF | 5.30:1 | AA | Lc 37.7 | Non-text elements, placeholder text |
| #1588BF text on white | 3.95:1 | AA large text | Lc 66.4 | Content text, not long reading |
| #1588BF text on black | 5.30:1 | AA | Lc -35.2 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C5DDED
oklch(88.5% 0.034 237)
-
Step 300
300
#9CC7E4
oklch(80.9% 0.061 238)
-
Step 400
400
#61AAD6
oklch(70.8% 0.098 236.8)
-
Step 500
500 (this color)
#1588BF
oklch(59.5% 0.125 237.1)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#024767
oklch(37.7% 0.081 237)
-
Step 950
950
#072A3C
oklch(27% 0.051 235.9)
#1588BF 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) | #6D88C1 | 0.070 |
| Deuteranopia (no green cones) | #5779BE | 0.057 |
| Tritanopia (no blue cones) | #00969B | 0.079 |
| Achromatopsia (no color) | #808080 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1588BF
#1588BF
oklch(59.5% 0.125 237.1)
- #B56927
#B56927
oklch(59.5% 0.124 57.3)
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 #1588BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.021
- Blue NCS #118AB2 ΔE 0.023
- Cool Blue #4984B8 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.031
- Nice Blue #107AB0 ΔE 0.043
- Windows Blue #3778BF ΔE 0.046
- Off Blue #5684AE ΔE 0.046
- Dusty Blue #5A86AD ΔE 0.051
Use #1588BF 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.