#266FDB
Closest named color: Royal Blue (#4169E1). oklch(55.8% 0.18 258.8), rgb(38, 111, 219).
Aa
White text reads best on this color (4.79:1).
About this color
#266FDB is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.180 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.026 away. White text reads best on it, at 4.79:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.37:1 |
| White text | 4.79:1 |
Values
| HEX | #266FDB |
| RGB | rgb(38, 111, 219) |
| HSL | hsl(216, 72%, 50%) |
| OKLCH | oklch(55.8% 0.18 258.8) |
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 #266FDB | 4.79:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #266FDB | 4.37:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #266FDB text on white | 4.79:1 | AA | Lc 72.7 | Content text, not long reading |
| #266FDB text on black | 4.37:1 | AA large text | Lc -29.0 | Dividers and decoration only |
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 600.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DBF8
oklch(88.6% 0.045 258.8)
-
Step 300
300
#A1C2F5
oklch(80.8% 0.081 259)
-
Step 400
400
#6DA1F1
oklch(70.7% 0.13 258.7)
-
Step 500
500
#4587EC
oklch(63.1% 0.166 258.8)
-
Step 600
600 (this color)
#266FDB
oklch(55.8% 0.18 258.8)
-
Step 700
700
#185BBD
oklch(49% 0.168 258.9)
-
Step 800
800
#174B99
oklch(42.6% 0.139 259)
-
Step 900
900
#19407A
oklch(37.8% 0.108 258.5)
-
Step 950
950
#102647
oklch(27% 0.068 258.4)
#266FDB 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) | #2C7BDF | 0.033 |
| Deuteranopia (no green cones) | #006BD9 | 0.019 |
| Tritanopia (no blue cones) | #00899A | 0.138 |
| Achromatopsia (no color) | #727272 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #266FDB
#266FDB
oklch(55.8% 0.18 258.8)
- #986A00
#986A00
oklch(55.8% 0.116 78.7)
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 #266FDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.026
- Cerulean Blue #056EEE ΔE 0.031
- Neon Blue #4361EE ΔE 0.049
- Azul #1D5DEC ΔE 0.053
- Windows Blue #3778BF ΔE 0.054
- Clear Blue #247AFD ΔE 0.057
- Bright Blue #0165FC ΔE 0.058
- Warm Blue #4B57DB ΔE 0.061
Use #266FDB 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.