#1B5ECB
Closest named color: Warm Blue (#4B57DB). oklch(50.8% 0.182 260.1), rgb(27, 94, 203).
Aa
White text reads best on this color (5.98:1).
About this color
#1B5ECB is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.182 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.051 away. White text reads best on it, at 5.98:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.182) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.51:1 |
| White text | 5.98:1 |
Values
| HEX | #1B5ECB |
| RGB | rgb(27, 94, 203) |
| HSL | hsl(217, 77%, 45%) |
| OKLCH | oklch(50.8% 0.182 260.1) |
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 #1B5ECB | 5.98:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #1B5ECB | 3.51:1 | AA large text | Lc 24.8 | Dividers and decoration only |
| #1B5ECB text on white | 5.98:1 | AA | Lc 79.3 | Fine for body text |
| #1B5ECB text on black | 3.51:1 | AA large text | Lc -22.6 | 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 700.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A0C2FA
oklch(80.9% 0.088 260.2)
-
Step 400
400
#6BA0F8
oklch(70.7% 0.141 260.1)
-
Step 500
500
#4385F4
oklch(63.1% 0.18 260.2)
-
Step 600
600
#226BE3
oklch(55.5% 0.196 260.2)
-
Step 700
700 (this color)
#1B5ECB
oklch(50.8% 0.182 260.1)
-
Step 800
800
#1549A0
oklch(42.7% 0.152 260.4)
-
Step 900
900
#183E7F
oklch(37.6% 0.118 260.4)
-
Step 950
950
#0F254A
oklch(27% 0.074 260.2)
#1B5ECB 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) | #006CCF | 0.035 |
| Deuteranopia (no green cones) | #005CC9 | 0.012 |
| Tritanopia (no blue cones) | #00798B | 0.139 |
| Achromatopsia (no color) | #636363 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5ECB
#1B5ECB
oklch(50.8% 0.182 260.1)
- #845D00
#845D00
oklch(50.6% 0.105 80.1)
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 #1B5ECB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.051
- Azul #1D5DEC ΔE 0.051
- Mid Blue #276AB3 ΔE 0.053
- Royal Blue #4169E1 ΔE 0.056
- Cerulean Blue #056EEE ΔE 0.065
- Blue Blue #2242C7 ΔE 0.065
- Neon Blue #4361EE ΔE 0.065
- French Blue #436BAD ΔE 0.072
Use #1B5ECB 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.