top Is 42 Years Old — These Five Tools Show What Your CPU Is Actually Doing
btop tracks your GPUs in real time, htop manages processes with a single keystroke, Glances exposes a full REST API, and Netdata alerts you before your disk fills up. Here is what replaces top in 2026 — and how to pick the right one.
top shipped in 1984, written by William LeFebvre for BSD 4.2. It still runs on every Linux server on the planet — type top in any terminal and you see the same text interface your predecessors stared at forty-two years ago. The problem is not that top is bad. The problem is that in forty-two years, your machines have acquired GPUs, containers, NVMe drives, and 100 Gbps network cards, and top shows you precisely none of that. As of July 2026, five tools have taken over. Here is what they can do — and why you should install one today.
htop — the Classic That Killed top
htop was the first tool to make top obsolete for interactive use. Created by Hisham Muhammad in 2004 and taken over by the htop-dev organization in 2020, it reached version 3.5.2 in July 2026. The gap versus top comes down to three things.
First, htop is color-coded and mouse-driven. Second, it shows processes in a tree view (F5), so you can immediately see which service forked what — essential when systemd or a Docker container spawns twenty child processes. Third, you can kill a process, renice it, or strace it directly from the interface, without leaving htop to type kill -9 in another terminal.
Installation is trivial — the htop package is in every repository (apt install htop, dnf install htop). It consumes less than 0.5% CPU under normal refresh and runs on Linux, FreeBSD, macOS, and Solaris. For interactive process management on a single server, htop is the de facto standard in 2026.
btop++ — Monitoring That Looks Good
If htop is the Swiss Army knife, btop++ (or simply btop) is the dashboard. Written in C++ by Aristocratos and released in 2021, btop hit version 1.4.7 in May 2026 and sits at 33,700 GitHub stars — more than any other tool on this list.
What btop brings that htop does not: GPU monitoring. It displays real-time load for Nvidia, AMD, and Intel GPUs, their VRAM usage, temperature, and clock speed. If you run Ollama, Stable Diffusion, or a Llama fine-tune on your machine, btop is the only terminal tool that shows you what your graphics card is actually doing.
The interface is clean, ASCII graphs are replaced by colored Unicode progress bars, and themes are fully customizable via btop.conf. All of this for under 1% CPU at the default refresh rate (1,500 ms). btop also supports per-partition disk tracking, per-interface network stats, and battery monitoring for laptops.
The tradeoff: btop is a display tool, not a manager. You cannot kill a process from btop — for that, you switch to htop.
Glances — the Python Power Tool
Glances, created by Nicolas Hennion (nicolargo), is the only tool on this list written in Python. This means two things: it is slower than btop or htop (~2–3% CPU in terminal mode), but it also does vastly more. As of July 2026, Glances holds 33,200 GitHub stars and has the longest feature list of the five.
Glances exposes a JSON REST API on port 61208. You can query http://localhost:61208/api/4/cpu and get CPU load back as JSON — making it the natural choice for scripting or integration with other tools. It also offers a web server mode: run glances -w and you get a dashboard accessible from any browser, with nothing else to install.
Glances plugins cover Docker, Podman, hardware sensors (temperatures, fans), NFS mounts, alerts (via email or custom scripts), and export to InfluxDB, Elasticsearch, StatsD, RabbitMQ, and CSV. An official Grafana dashboard is maintained in the project, with a ready-to-import JSON template.
The downside is resource consumption: 2–3% CPU sustained, and up to 150 MB of RAM due to the Python interpreter and dependencies. On a single vCPU server, that is noticeable. On a workstation or build server, it is negligible for the information it delivers.
Netdata — Real-Time Monitoring That Alerts You
Netdata lives in a different category. Where htop, btop, and Glances are interactive diagnostic tools, Netdata is a continuous monitoring system. It collects over 2,000 metrics per second (CPU, memory, disk, network, containers, databases, applications), stores them locally, and displays them in a real-time web dashboard with interactive charts updated every second.
Installation takes under a minute via the official kickstart.sh script. Once running, Netdata listens on port 19999 and gives you a complete dashboard with zero configuration. For multi-server infrastructure, the Parent-Child mode centralizes metrics from multiple nodes onto a single parent, with configurable retention and high availability. Netdata also supports Kubernetes via a dedicated Helm chart, with automatic pod and service discovery.
Netdata’s killer feature versus the earlier tools is alerting. The system ships with hundreds of preconfigured alarms: CPU saturation, 90% disk usage, container crash loop, expiring SSL certificates. Notifications go out via email, Slack, Discord, Telegram, PagerDuty — all pre-wired.
The cost: Netdata is no longer fully open source. Since 2024, the code is under the NCUL1 (Netdata Cloud User License), which prohibits SaaS usage without a commercial agreement. The cloud dashboard (Netdata Cloud) is a freemium service that syncs your nodes and offers shared dashboards. For personal use or a self-hosted SMB, the standalone agent remains free and fully functional.
Prometheus + node_exporter — When You Need to Monitor at Scale
If you manage more than five servers, you are out of the interactive diagnostics game. You are in infrastructure monitoring, and the standard tool since 2016 is Prometheus — a time-series engine created at SoundCloud and maintained by the CNCF since it reached graduated status in 2018.
The node_exporter (v1.10.2, 13,600 GitHub stars) is a 20 MB static binary written in Go that exposes every metric of a Linux host on port 9100 in Prometheus format. Prometheus scrapes these metrics every 15 seconds and stores them in a local time-series database. You then build your dashboards in Grafana and define your alerts in Alertmanager.
The fundamental difference between Netdata and Prometheus is that Prometheus does not do dashboards. It scrapes, stores, alerts — that is it. It is a component of a stack, not an all-in-one product. In return, it is vastly more scalable: a central Prometheus instance can scrape thousands of targets, with a mature PromQL query language and native Grafana integration.
The node_exporter itself exposes over 50 collectors: CPU, memory, disk, network, filesystem, /proc, NUMA, ZFS, NFS, IPVS, DRBD, and even systemd and conntrack statistics. It uses under 30 MB of RAM and under 0.5% CPU continuously — lighter than Glances, more comprehensive than btop.
The Comparison Table
Verdict
If you only have one server, install btop today — you will see your GPUs, your NVMe drives, and your network traffic in real time, in a clean interface, for under 1% CPU. Keep htop alongside it for killing a stubborn process: the two tools are complementary and together weigh under 20 MB.
If you need an API or a dashboard without infrastructure, go with Glances. Web mode gives you a dashboard in one command (glances -w), the REST API is documented, and the InfluxDB + Grafana export covers time-series needs without deploying Prometheus.
If you want to be alerted before a disk fills up, Netdata offers the best effort-to-result ratio. A one-minute install, hundreds of pre-wired alarms, and a dashboard that shows everything instantly. The 2024 license change is the only caveat for companies reselling monitoring — for self-hosting, it is transparent.
If you manage more than five servers, stop wasting time with interactive tools. Deploy node_exporter on every machine, scrape with Prometheus, visualize with Grafana. It is the stack everyone uses for a reason: it handles scale, it scales horizontally, and it does not lock you into a vendor.
top is forty-two years old and deserves our respect. But in July 2026, your CPU deserves better.
References
- htop — an interactive process viewer
- aristocratos/btop — 33.7k stars on GitHub
- Glances — An Eye on your system
- Netdata — What is Netdata?
- Prometheus Node Exporter — 13.6k stars on GitHub
- Prometheus — Monitoring Linux host metrics with the Node Exporter
- btop++ v1.4.7 Release Notes
- htop v3.5.2 Release Notes