#1597DF
Closest named color: Dark Sky Blue (#448EE4). oklch(64.7% 0.147 241.5), rgb(21, 151, 223).
Aa
Black text reads best on this color (6.52:1).
About this color
#1597DF is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.147 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.033 away. Black text reads best on it, at 6.52:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.52:1 |
| White text | 3.21:1 |
Values
| HEX | #1597DF |
| RGB | rgb(21, 151, 223) |
| HSL | hsl(201, 83%, 48%) |
| OKLCH | oklch(64.7% 0.147 241.5) |
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 #1597DF | 3.21:1 | AA large text | Lc -64.3 | Content text, not long reading |
| Black text on #1597DF | 6.52:1 | AA | Lc 45.2 | Large or bold text, headings |
| #1597DF text on white | 3.21:1 | AA large text | Lc 58.8 | Large or bold text, headings |
| #1597DF text on black | 6.52:1 | AA | Lc -42.9 | 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
#DEECF7
oklch(93.6% 0.021 241.4)
-
Step 200
200
#C3DDF2
oklch(88.5% 0.04 242.4)
-
Step 300
300
#97C7EB
oklch(80.8% 0.072 241.2)
-
Step 400
400
#58A9E2
oklch(70.7% 0.115 241.6)
-
Step 500
500 (this color)
#1597DF
oklch(64.7% 0.147 241.5)
-
Step 600
600
#007AB8
oklch(55.5% 0.131 241.7)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005480
oklch(42.6% 0.1 241.3)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#022941
oklch(26.9% 0.061 241.6)
#1597DF 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) | #7499E2 | 0.070 |
| Deuteranopia (no green cones) | #5988DE | 0.053 |
| Tritanopia (no blue cones) | #00A9B1 | 0.098 |
| Achromatopsia (no color) | #8F8F8F | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1597DF
#1597DF
oklch(64.7% 0.147 241.5)
- #CD760A
#CD760A
oklch(64.8% 0.147 61.5)
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 #1597DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.033
- Chefchaouen Blue #4895EF ΔE 0.038
- Water Blue #0E87CC ΔE 0.049
- Dodger Blue #1E90FF ΔE 0.055
- Cornflower Blue #6495ED ΔE 0.057
- Soft Blue #6488EA ΔE 0.066
- Faded Blue #658CBB ΔE 0.070
- Cool Blue #4984B8 ΔE 0.070
Use #1597DF 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.