#1B5FBE
Closest named color: Mid Blue (#276AB3). oklch(50% 0.164 258.2), rgb(27, 95, 190).
Aa
White text reads best on this color (6.12:1).
About this color
#1B5FBE is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.164 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.039 away. White text reads best on it, at 6.12:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.42:1 |
| White text | 6.12:1 |
Values
| HEX | #1B5FBE |
| RGB | rgb(27, 95, 190) |
| HSL | hsl(215, 75%, 43%) |
| OKLCH | oklch(50% 0.164 258.2) |
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 #1B5FBE | 6.12:1 | AA | Lc -85.2 | Fine for body text |
| Black text on #1B5FBE | 3.42:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #1B5FBE text on white | 6.12:1 | AA | Lc 80.0 | Fine for body text |
| #1B5FBE text on black | 3.42:1 | AA large text | Lc -21.8 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DBF7
oklch(88.6% 0.044 258)
-
Step 300
300
#A1C3F4
oklch(81% 0.079 257.5)
-
Step 400
400
#6EA1EF
oklch(70.6% 0.127 258.6)
-
Step 500
500
#4688E9
oklch(63.1% 0.161 258.1)
-
Step 600
600
#256FD8
oklch(55.6% 0.177 258.2)
-
Step 700
700 (this color)
#1B5FBE
oklch(50% 0.164 258.2)
-
Step 800
800
#174C97
oklch(42.7% 0.135 258.2)
-
Step 900
900
#1A4078
oklch(37.7% 0.105 258.3)
-
Step 950
950
#102646
oklch(27% 0.066 257.9)
#1B5FBE 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) | #2369C1 | 0.028 |
| Deuteranopia (no green cones) | #005BBC | 0.016 |
| Tritanopia (no blue cones) | #007685 | 0.125 |
| Achromatopsia (no color) | #626262 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5FBE
#1B5FBE
oklch(50% 0.164 258.2)
- #835A00
#835A00
oklch(49.9% 0.104 77.9)
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 #1B5FBE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.039
- French Blue #436BAD ΔE 0.058
- Warm Blue #4B57DB ΔE 0.065
- Royal Blue #4169E1 ΔE 0.069
- Blue Blue #2242C7 ΔE 0.071
- Azul #1D5DEC ΔE 0.072
- Denim Blue #3B5B92 ΔE 0.072
- Peacock Blue #016795 ΔE 0.074
Use #1B5FBE 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.