#2597DF
Closest named color: Dark Sky Blue (#448EE4). oklch(65% 0.144 242.8), rgb(37, 151, 223).
Aa
Black text reads best on this color (6.57:1).
About this color
#2597DF is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.144 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.030 away. Black text reads best on it, at 6.57:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.57:1 |
| White text | 3.19:1 |
Values
| HEX | #2597DF |
| RGB | rgb(37, 151, 223) |
| HSL | hsl(203, 74%, 51%) |
| OKLCH | oklch(65% 0.144 242.8) |
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 #2597DF | 3.19:1 | AA large text | Lc -64.1 | Content text, not long reading |
| Black text on #2597DF | 6.57:1 | AA | Lc 45.4 | Large or bold text, headings |
| #2597DF text on white | 3.19:1 | AA large text | Lc 58.7 | Large or bold text, headings |
| #2597DF text on black | 6.57:1 | AA | Lc -43.1 | 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
#99C7EB
oklch(81% 0.07 242.3)
-
Step 400
400
#5CA8E1
oklch(70.6% 0.113 243)
-
Step 500
500 (this color)
#2597DF
oklch(65% 0.144 242.8)
-
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
#00466D
oklch(37.8% 0.09 242.2)
-
Step 950
950
#052941
oklch(27% 0.06 243.1)
#2597DF 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) | #7599E2 | 0.066 |
| Deuteranopia (no green cones) | #5B89DE | 0.049 |
| Tritanopia (no blue cones) | #00A9B1 | 0.098 |
| Achromatopsia (no color) | #909090 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2597DF
#2597DF
oklch(65% 0.144 242.8)
- #CB7811
#CB7811
oklch(64.9% 0.144 62.9)
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 #2597DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.030
- Chefchaouen Blue #4895EF ΔE 0.034
- Water Blue #0E87CC ΔE 0.051
- Cornflower Blue #6495ED ΔE 0.052
- Dodger Blue #1E90FF ΔE 0.055
- Soft Blue #6488EA ΔE 0.063
- Faded Blue #658CBB ΔE 0.067
- Cool Blue #4984B8 ΔE 0.069
Use #2597DF 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.