#1F5BBF
Closest named color: Mid Blue (#276AB3). oklch(49.3% 0.169 260.3), rgb(31, 91, 191).
Aa
White text reads best on this color (6.35:1).
About this color
#1F5BBF is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.169 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.048 away. White text reads best on it, at 6.35:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.30:1 |
| White text | 6.35:1 |
Values
| HEX | #1F5BBF |
| RGB | rgb(31, 91, 191) |
| HSL | hsl(218, 72%, 44%) |
| OKLCH | oklch(49.3% 0.169 260.3) |
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 #1F5BBF | 6.35:1 | AA | Lc -86.2 | Fine for body text |
| Black text on #1F5BBF | 3.30:1 | AA large text | Lc 23.0 | Dividers and decoration only |
| #1F5BBF text on white | 6.35:1 | AA | Lc 81.0 | Fine for body text |
| #1F5BBF text on black | 3.30:1 | AA large text | Lc -20.8 | 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
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A2C2F6
oklch(80.9% 0.082 260)
-
Step 400
400
#70A0F2
oklch(70.7% 0.132 260.6)
-
Step 500
500
#4986ED
oklch(63.1% 0.168 260.2)
-
Step 600
600
#2B6DDB
oklch(55.5% 0.182 260.2)
-
Step 700
700 (this color)
#1F5BBF
oklch(49.3% 0.169 260.3)
-
Step 800
800
#1B4A9A
oklch(42.6% 0.141 260.4)
-
Step 900
900
#1C3F7A
oklch(37.7% 0.109 260.2)
-
Step 950
950
#112548
oklch(26.9% 0.07 260.7)
#1F5BBF 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) | #1167C3 | 0.031 |
| Deuteranopia (no green cones) | #0059BD | 0.015 |
| Tritanopia (no blue cones) | #007484 | 0.131 |
| Achromatopsia (no color) | #5F5F5F | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F5BBF
#1F5BBF
oklch(49.3% 0.169 260.3)
- #7F5A00
#7F5A00
oklch(49.4% 0.102 80.7)
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 #1F5BBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.048
- Blue Blue #2242C7 ΔE 0.060
- Warm Blue #4B57DB ΔE 0.062
- French Blue #436BAD ΔE 0.066
- Azul #1D5DEC ΔE 0.070
- Royal Blue #4169E1 ΔE 0.072
- Denim Blue #3B5B92 ΔE 0.074
- Iris #6258C4 ΔE 0.075
Use #1F5BBF 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.