#1597DB
Closest named color: Dark Sky Blue (#448EE4). oklch(64.5% 0.143 240), rgb(21, 151, 219).
Aa
Black text reads best on this color (6.48:1).
About this color
#1597DB is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.143 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.036 away. Black text reads best on it, at 6.48:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.48:1 |
| White text | 3.24:1 |
Values
| HEX | #1597DB |
| RGB | rgb(21, 151, 219) |
| HSL | hsl(201, 83%, 47%) |
| OKLCH | oklch(64.5% 0.143 240) |
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 #1597DB | 3.24:1 | AA large text | Lc -64.5 | Content text, not long reading |
| Black text on #1597DB | 6.48:1 | AA | Lc 45.0 | Non-text elements, placeholder text |
| #1597DB text on white | 3.24:1 | AA large text | Lc 59.1 | Large or bold text, headings |
| #1597DB text on black | 6.48:1 | AA | Lc -42.6 | 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
#DEECF6
oklch(93.6% 0.02 238.7)
-
Step 200
200
#C3DDF1
oklch(88.5% 0.039 241.1)
-
Step 300
300
#98C7EA
oklch(80.9% 0.07 240.9)
-
Step 400
400
#58A9DF
oklch(70.6% 0.112 240.1)
-
Step 500
500 (this color)
#1597DB
oklch(64.5% 0.143 240)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800
#00557F
oklch(42.8% 0.098 239.8)
-
Step 900
900
#00466A
oklch(37.6% 0.086 240.1)
-
Step 950
950
#032A40
oklch(27.2% 0.058 239.3)
#1597DB 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) | #7698DE | 0.072 |
| Deuteranopia (no green cones) | #5C87DA | 0.057 |
| Tritanopia (no blue cones) | #00A8AF | 0.094 |
| Achromatopsia (no color) | #8F8F8F | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1597DB
#1597DB
oklch(64.5% 0.143 240)
- #CB751A
#CB751A
oklch(64.4% 0.143 60)
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 #1597DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.036
- Chefchaouen Blue #4895EF ΔE 0.042
- Water Blue #0E87CC ΔE 0.047
- Cornflower Blue #6495ED ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.061
- Cool Blue #4984B8 ΔE 0.066
- Faded Blue #658CBB ΔE 0.066
- Blue NCS #118AB2 ΔE 0.067
Use #1597DB 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.