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LT

Lightweight tables for R, inspired by gt.

lt provides a small grammar of tables that covers the structure most reports need — titles, column spanners, row groups, footnotes, and number formatting — without the heavy dependency stack. It targets HTML only (no LaTeX or RTF), which keeps the implementation minimal: the entire runtime is a single vanilla-JS file (under 10 KB minified).

Example

library(lt)

d = data.frame(
  Group = c("Treatment", "Treatment", "Control", "Control"),
  Endpoint = c("Primary", "Secondary", "Primary", "Secondary"),
  Estimate = c(0.6123, 0.7891, 0.4567, 0.5432),
  CI_Lower = c(0.4012, 0.5678, 0.2345, 0.3210),
  CI_Upper = c(0.8234, 1.0104, 0.6789, 0.7654),
  P_Value = c(0.0012, 0.0456, 0.1234, 0.2345)
)
lt(d) |>
  lt_group(~ Group) |>
  lt_header("Study Results", "Primary and secondary endpoints") |>
  lt_spanner(`95% CI` ~ CI_Lower + CI_Upper) |>
  lt_format(~ Estimate + CI_Lower + CI_Upper, decimals = 3) |>
  lt_format(~ P_Value, decimals = 4) |>
  lt_footnote("Two-sided p-value from log-rank test.", "column", ~ P_Value)

More examples at https://pkg.yihui.org/lt/examples.html.

Installation

install.packages("lt", repos = "https://yihui.r-universe.dev")

Acknowledgements

This package was written with the help of Claude Code. lt is directly inspired by gt by Rich Iannone and the RStudio/Posit team. The grammar of tables that gt pioneered — layering titles, spanners, footnotes, and formatters onto a data frame — is a great idea; lt aims to provide a minimal re-implementation for contexts where a lighter footprint is preferred.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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