Self-Hosted C++ Terminal UI Libraries: FTXUI vs replxx vs linenoise vs tabulate

Introduction

Terminal user interfaces (TUIs) are experiencing a renaissance. As developers build more CLI-first tools for DevOps workflows, database management, system monitoring, and developer tooling, the demand for rich, interactive terminal experiences has grown beyond basic printf and std::cin. Modern C++ terminal UI libraries provide everything from syntax-highlighted line editing to full dashboard-style layouts — all within a terminal emulator, with no GUI dependencies.

This article compares four C++ terminal UI libraries across two categories: interactive input (replxx, linenoise) and rendered output (FTXUI, tabulate).

Comparison Table

FTXUI: Full Terminal UI Framework

FTXUI (Functional Terminal User Interface) by Arthur Sonzogni is the most starred C++ TUI library on GitHub with over 10,000 stars. It provides a declarative, component-based API inspired by React and Flutter, where you describe what your UI should look like and FTXUI handles rendering, event processing, and screen updates.

Installation

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include(FetchContent)
FetchContent_Declare(
  ftxui
  GIT_REPOSITORY https://github.com/ArthurSonzogni/FTXUI.git
  GIT_TAG        v5.1.0
)
FetchContent_MakeAvailable(ftxui)
target_link_libraries(your_target PRIVATE ftxui::screen ftxui::dom ftxui::component)

Interactive Dashboard Example

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#include <ftxui/dom/elements.hpp>
#include <ftxui/screen/screen.hpp>
#include <ftxui/component/component.hpp>
#include <ftxui/component/screen_interactive.hpp>

using namespace ftxui;

int main() {
    auto screen = ScreenInteractive::TerminalOutput();
    
    int counter = 0;
    std::vector<std::string> entries = {"CPU: 23%", "Memory: 4.2/16 GB", "Disk: 156/512 GB"};
    int selected = 0;
    
    auto menu = Menu(&entries, &selected);
    
    auto component = Container::Vertical({
        Renderer([&] {
            return vbox({
                text("System Monitor Dashboard") | bold | center,
                separator(),
                gauge(0.23) | border,
                text("CPU Usage: 23%") | dim,
            });
        }),
        menu | border,
        Renderer([&] {
            return text("Press q to quit, ↑↓ to navigate") | dim | center;
        }),
    });
    
    screen.Loop(component);
}

FTXUI’s layout system uses a flexbox-like model: hbox / vbox for layout, flex for sizing, border for decoration, and center / bold / dim for styling. Components handle keyboard and mouse input declaratively.

Button and Input Components

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std::string name;
auto input = Input(&name, "Enter your name");

auto button = Button("Submit", [&] {
    // handle submission
});

auto component = Container::Vertical({input, button});
screen.Loop(component);

replxx: Syntax-Highlighted Line Editor

replxx is a readline replacement that adds syntax highlighting, context-sensitive hints, and multi-line editing. It’s designed for interactive REPLs, CLI tools, and debugger frontends where GNU readline is too limited or has licensing concerns (readline is GPL, replxx is BSD).

Installation

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FetchContent_Declare(
  replxx
  GIT_REPOSITORY https://github.com/AmokHuginnsson/replxx.git
)
FetchContent_MakeAvailable(replxx)
target_link_libraries(your_target PRIVATE replxx)

Interactive REPL with Syntax Highlighting

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#include <replxx.hxx>

replxx::Replxx rx;

// Register syntax highlighting
rx.install_window_change_handler();
rx.set_completion_callback([](const std::string& input, int& ctx_len) {
    // Provide completions based on input
    return replxx::Replxx::completions_t{"SELECT", "INSERT", "UPDATE", "DELETE"};
});

rx.set_highlighter_callback([](const std::string& input, replxx::Replxx::colors_t& colors) {
    // Highlight SQL keywords in blue
    for (auto& kw : {"SELECT", "FROM", "WHERE", "INSERT", "UPDATE"}) {
        auto pos = input.find(kw);
        while (pos != std::string::npos) {
            for (size_t i = 0; i < strlen(kw); i++)
                colors[pos + i] = replxx::Replxx::color::blue;
            pos = input.find(kw, pos + 1);
        }
    }
});

rx.set_hint_callback([](const std::string& input, int& ctx_len, replxx::Replxx::Color& color) {
    if (input == "SEL") return std::string("ECT * FROM table;");
    return std::string();
});

while (true) {
    char const* line = rx.input("sql> ");
    if (line == nullptr) break;
    std::cout << "Executed: " << line << std::endl;
    rx.history_add(line);
}

linenoise: Minimalist Line Editor

linenoise by Salvatore Sanfilippo (creator of Redis) is the original minimalist readline alternative. At roughly 1,500 lines of C, it provides basic line editing (arrow keys, history, tab completion) with zero external dependencies. It’s used by Redis, SQLite, and many other high-profile projects.

Installation

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# Download the single .c and .h files
wget https://raw.githubusercontent.com/antirez/linenoise/master/linenoise.c
wget https://raw.githubusercontent.com/antirez/linenoise/master/linenoise.h

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add_library(linenoise linenoise.c)
target_include_directories(linenoise PUBLIC .)
target_link_libraries(your_target PRIVATE linenoise)

Basic REPL

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#include "linenoise.h"

linenoiseSetCompletionCallback([](const char* buf, linenoiseCompletions* lc) {
    if (buf[0] == 'h') {
        linenoiseAddCompletion(lc, "help");
        linenoiseAddCompletion(lc, "history");
    }
});

linenoiseHistoryLoad("history.txt");

char* line;
while ((line = linenoise("myapp> ")) != nullptr) {
    printf("You typed: %s
", line);
    linenoiseHistoryAdd(line);
    free(line);
}

linenoiseHistorySave("history.txt");

linenoise deliberately omits syntax highlighting, hints, and multi-line editing to stay minimal. If you need a dead-simple line editor that “just works” and don’t want to deal with GNU readline’s GPL licensing, linenoise is the canonical choice.

tabulate: Table Rendering for C++

tabulate by Pranav Srinivas Kumar provides beautiful ASCII table formatting with automatic alignment, text wrapping, and multiple border styles. While not interactive, it’s essential for CLI tools that need to display structured data.

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#include <tabulate/table.hpp>
using namespace tabulate;

Table users;
users.add_row({"ID", "Name", "Role", "Status"});
users.add_row({"1", "Alice", "Admin", "Active"});
users.add_row({"2", "Bob", "User", "Inactive"});
users.add_row({"3", "Charlotte", "Moderator", "Active"});

users.format()
    .font_style({FontStyle::bold})
    .border_top("=")
    .border_bottom("=")
    .corner("+");

users[0].format()
    .font_color(Color::yellow)
    .font_align(FontAlign::center);

std::cout << users << std::endl;

Output:

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+====+===========+===========+==========+
| ID | Name      | Role      | Status   |
+====+===========+===========+==========+
| 1  | Alice     | Admin     | Active   |
+----+-----------+-----------+----------+
| 2  | Bob       | User      | Inactive |
+----+-----------+-----------+----------+
| 3  | Charlotte | Moderator | Active   |
+----+-----------+-----------+----------+

Building an End-to-End CLI Tool

Combining replxx for input with tabulate for output creates a professional CLI experience:

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replxx::Replxx rx;
// ... set up replxx ...

while (auto line = rx.input("db> ")) {
    auto result = execute_query(line);
    
    tabulate::Table t;
    for (auto& col : result.columns)
        t.add_row(col.header);
    for (auto& row : result.rows)
        t.add_row(row);
    
    std::cout << t << std::endl;
}

For a richer UI with dashboards and real-time updates, FTXUI’s ScreenInteractive refreshes at 60fps by default, enabling live-updating system monitors, database explorers, and terminal-based file managers.

For building complete CLI developer tools, see our C++ code coverage tools guide which integrates nicely with terminal-based reporting.

If you’re creating CLI tools for system administration, our C++ networking libraries comparison covers the backend side of interactive network tools.

Choosing the Right Library

For interactive shells, REPLs, and CLI debuggers, use replxx when you need syntax highlighting, hints, and multi-line editing (BSD licensed). Use linenoise for minimal embedded use cases where every kilobyte matters (also BSD licensed). Both avoid GNU readline’s GPL restrictions.

For dashboard applications, TUI file managers, and system monitors, use FTXUI. Its component model scales from simple buttons to complex nested layouts, and its active maintenance (updated June 2026) ensures ongoing support. The 10,000+ star community provides extensive examples.

For displaying structured data in any CLI tool, tabulate is the go-to library. It handles alignment, word wrapping, color, and Unicode seamlessly. Combine it with any input library for a complete CLI experience.

FAQ

Does linenoise support Unicode and multi-byte characters?

linenoise has basic UTF-8 support for display but does not handle wide characters (CJK, emoji) correctly in all terminal configurations. For full Unicode support with proper display width handling, use replxx which has dedicated Unicode-aware cursor positioning.

How does FTXUI compare to ncurses?

FTXUI is a higher-level, component-based library built on its own terminal abstraction — it does not use ncurses. ncurses provides low-level terminal control (raw mode, cursor positioning, color manipulation), while FTXUI provides a declarative UI layer on top. For most applications, FTXUI is more productive. Use ncurses directly only if you need control over terminal quirks that FTXUI abstracts away.

Can I use FTXUI with replxx in the same application?

Yes — replxx handles the input line at the bottom of the screen, while FTXUI renders the rest of the terminal display. You’ll need to coordinate terminal state carefully (both libraries modify terminal settings), but the pattern works well for split-screen CLI applications with a persistent dashboard area and an interactive prompt area.

Is tabulate suitable for large datasets?

tabulate renders the entire table into a string before output, so very large tables (10,000+ rows) will consume significant memory. For large datasets, consider paginating through FTXUI (which supports scrollable regions) or using tabulate with lazy streaming, writing rows incrementally. For simple data export, CSV with column alignment is often more practical.

Why choose a C++ terminal UI instead of a web-based interface?

Terminal UIs have near-zero latency (no browser rendering pipeline, no network roundtrips), work over SSH without port forwarding, consume negligible memory (FTXUI apps often run in <10MB), and are accessible to visually impaired users via screen readers. For DevOps tools managing remote servers, a terminal UI is often the right default — add a web interface only when you need graphical charts or mobile access. For more on self-hosted monitoring dashboards, see our metrics storage comparison.

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