#1F5BB1
Closest named color: Mid Blue (#276AB3). oklch(48.2% 0.15 258.3), rgb(31, 91, 177).
Aa
White text reads best on this color (6.58:1).
About this color
#1F5BB1 is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.150 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.043 away. White text reads best on it, at 6.58:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.18:1 |
| White text | 6.58:1 |
Values
| HEX | #1F5BB1 |
| RGB | rgb(31, 91, 177) |
| HSL | hsl(215, 70%, 41%) |
| OKLCH | oklch(48.2% 0.15 258.3) |
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 #1F5BB1 | 6.58:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #1F5BB1 | 3.18:1 | AA large text | Lc 22.0 | Dividers and decoration only |
| #1F5BB1 text on white | 6.58:1 | AA | Lc 82.1 | Fine for body text |
| #1F5BB1 text on black | 3.18:1 | AA large text | Lc -19.8 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DAF4
oklch(88.4% 0.04 258.8)
-
Step 300
300
#A4C2F0
oklch(80.8% 0.073 258.8)
-
Step 400
400
#73A2E9
oklch(70.8% 0.116 258.4)
-
Step 500
500
#4D89E2
oklch(63.2% 0.148 258.2)
-
Step 600
600
#2F70D0
oklch(55.5% 0.163 258.4)
-
Step 700
700 (this color)
#1F5BB1
oklch(48.2% 0.15 258.3)
-
Step 800
800
#1E4D92
oklch(42.8% 0.125 258.4)
-
Step 900
900
#1E4174
oklch(37.8% 0.096 258)
-
Step 950
950
#122644
oklch(26.9% 0.062 258.3)
#1F5BB1 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) | #2964B4 | 0.027 |
| Deuteranopia (no green cones) | #0057AF | 0.019 |
| Tritanopia (no blue cones) | #00707D | 0.116 |
| Achromatopsia (no color) | #5D5D5D | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F5BB1
#1F5BB1
oklch(48.2% 0.15 258.3)
- #7D5600
#7D5600
oklch(48.3% 0.101 78.2)
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 #1F5BB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.054
- Dusk Blue #26538D ΔE 0.059
- French Blue #436BAD ΔE 0.060
- Dusky Blue #475F94 ΔE 0.062
- Peacock Blue #016795 ΔE 0.062
- Light Navy Blue #2E5A88 ΔE 0.066
- Blue Blue #2242C7 ΔE 0.070
Use #1F5BB1 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.