OctoPrint defined the “Raspberry Pi taped to the printer” category and it’s still the most installed print server out there. The world around it shifted, though. Klipper firmware became the default for performance tuning, and the Klipper community grew Mainsail and Fluidd as web interfaces that look more modern than OctoPrint’s. Bambu Lab printers ship their own networking stack and skip OctoPrint entirely. The XDA piece on freeing Bambu printers with OrcaSlicer hinted at the same shift: the slicer changed, and so did the print-server choice.
We tested seven OctoPrint alternatives on Linux, Windows, and Mac, focusing on what daily remote print management actually needs: starting a print over Wi-Fi, watching a webcam feed, killing a job from the couch, and surviving an SD card crash. Each pick is rated for Klipper compatibility, GUI quality, plugin ecosystem, and how forgiving it is when the host machine reboots mid-print.
Quick comparison
| App | Best for | Free plan | Starting price/mo | Standout feature |
|---|---|---|---|---|
| Mainsail | Klipper printers | Yes | Free | Cleanest Klipper UI |
| Fluidd | Klipper alternative UI | Yes | Free | Lighter than Mainsail |
| KlipperScreen | Touchscreen at the printer | Yes | Free | Local touch UI for Klipper |
| Duet Web Control | Duet boards and high-end FDM | Yes | Free | First-party for Duet hardware |
| Repetier-Server | Multi-printer farms | Yes | Free (Pro a one-time fee) | Manages many printers from one host |
| AstroPrint | Cloud-managed printers | Yes | Subscription for advanced features | No-Pi cloud option |
| Obico | OctoPrint + AI failure detection | Yes | Subscription for cloud monitoring | Spaghetti detection |
Why people leave OctoPrint
The complaints aren’t catastrophic but they accumulate:
- The plugin compatibility churn when an OctoPrint update breaks a plugin you depend on, and the plugin maintainer has moved on.
- The lack of native Klipper support — OctoPrint can talk to Klipper through a wrapper, but Mainsail and Fluidd were built for Klipper from the start.
- The single-printer focus by default — running multiple printers usually means multiple Pis, each with its own OctoPrint instance.
- The UI age — OctoPrint’s default theme still looks like 2014, and themes like OctoPrint-Material help but feel bolted on.
- The resource overhead on small Pis — OctoPrint plus a webcam stream can saturate a Pi 3B during high-speed Klipper prints.
The 7 alternatives
1. Mainsail — best for Klipper printers
Mainsail is the most popular Klipper web interface. The dashboard is modern, the macro editor is built in, the timelapse plugin works without extra wiring, and the multi-printer support lets you watch a small farm from one browser tab. Most Klipper setups installed via KIAUH or MainsailOS ship Mainsail by default.
Where it falls short: Klipper-only — won’t drive a Marlin printer. Heavier than Fluidd on lower-end Pis.
Pricing:
- Free / Open source
- Paid: None
Migrating from OctoPrint: Replace OctoPrint with MainsailOS on a fresh SD card, or layer Mainsail on top of an existing Klipper install via KIAUH. The slicer keeps working — slice in OrcaSlicer or PrusaSlicer, upload through Mainsail’s web UI.
Download: docs.mainsail.xyz (Linux on Pi recommended)
Bottom line: Pick Mainsail when your printer runs Klipper and you want the most polished web UI.
2. Fluidd — best lightweight Klipper alternative
Fluidd is the other big Klipper web UI. Built around the same Moonraker API as Mainsail, it focuses on a lighter footprint and a cleaner default dashboard. Switching between Mainsail and Fluidd on the same Klipper install is a single config change.
Where it falls short: Smaller plugin ecosystem than Mainsail. Some niche timelapse features need extra setup.
Pricing:
- Free / Open source
- Paid: None
Migrating from OctoPrint: Same path as Mainsail. Install Klipper plus Moonraker plus Fluidd, point browser at the Pi.
Download: docs.fluidd.xyz (Linux on Pi recommended)
Bottom line: Pick Fluidd when you run Klipper on a low-end Pi and want a lighter UI than Mainsail.
3. KlipperScreen — best for the printer-side touchscreen
KlipperScreen is the touchscreen UI you mount on the printer itself, running on a 5- to 7-inch HDMI display or an official Pi touchscreen. It pairs with Mainsail or Fluidd over the network, so the printer has both a local touchscreen and a web dashboard.
Where it falls short: Klipper-only. Requires a touchscreen and the wiring or stand to mount it. Some screens need manual rotation config.
Pricing:
- Free / Open source
- Paid: None (touchscreen hardware is the only cost)
Migrating from OctoPrint: OctoPrint’s TouchUI plugin solved a similar problem; KlipperScreen replaces it on Klipper printers with a more native experience and physical buttons for common actions.
Download: klipperscreen.readthedocs.io (Linux on Pi recommended)
Bottom line: Pick KlipperScreen when you want a physical touchscreen at the printer alongside a web UI.
4. Duet Web Control — best for Duet boards
Duet Web Control ships with Duet’s mainboards (Duet 2, Duet 3) and is the closest thing to a “print server is the mainboard” experience. The web UI runs directly on the Duet board’s onboard processor, no Pi required, and supports CoreXY, Delta, and large-format printer configurations.
Where it falls short: Duet hardware only. The Duet boards themselves cost notably more than a Pi plus an OctoPrint setup.
Pricing:
- Free
- Paid: None (hardware-bundled)
Migrating from OctoPrint: Buy a Duet board, swap it for the existing mainboard, and Duet Web Control replaces OctoPrint as the network control layer entirely.
Download: duet3d.com (web UI bundled with Duet hardware)
Bottom line: Pick Duet Web Control when you’ve upgraded to a Duet board and want the first-party network experience.
5. Repetier-Server — best for multi-printer farms
Repetier-Server runs on one host (Pi, PC, or Linux server) and manages multiple printers in parallel. The Free tier handles two printers; the paid Pro tier removes the limit and adds features like per-printer access control and a more detailed history.
Where it falls short: UI feels dated next to Mainsail and Fluidd. Klipper support exists but isn’t first-class.
Pricing:
- Free: Up to two printers
- Paid: A one-time fee for Pro adds unlimited printers and pro features
Migrating from OctoPrint: Install Repetier-Server, add each printer’s serial connection, and the existing OctoPrint flow translates: slice in your usual tool, upload G-code through the Repetier web UI.
Download: repetier-server.com (Windows, Mac, Linux)
Bottom line: Pick Repetier-Server when you run more than two printers and want them in one dashboard.
6. AstroPrint — best for cloud-managed printers without a Pi
AstroPrint runs on a Pi, on a Mac, on a Windows PC, or directly on the AstroPrint cloud, depending on what hardware you have. The cloud-managed mode is the differentiator: no local print server, the printer connects to AstroPrint’s cloud through a USB-to-Wi-Fi adapter, and remote control happens through the browser anywhere.
Where it falls short: Some features need the paid cloud subscription. Privacy-conscious users dislike the cloud-first design.
Pricing:
- Free: Local features, single printer
- Paid: Cloud subscription adds remote monitoring tiers, recurring monthly fees
Migrating from OctoPrint: Install AstroBox software on the same Pi that ran OctoPrint, or skip the Pi entirely and use AstroPrint’s adapter. Profiles and G-code uploads work through the AstroPrint web UI.
Download: astroprint.com (Windows, Mac, Linux, cloud)
Bottom line: Pick AstroPrint when you want cloud-managed remote control and the Pi tax doesn’t appeal.
7. Obico — best for AI failure detection
Obico (formerly The Spaghetti Detective) layers AI failure detection on top of OctoPrint or Klipper. The plugin watches the webcam feed for “spaghetti” — failed prints that have come loose and turned into a tangle — and pauses the print before it eats more filament. The same project ships its own Mainsail/Fluidd companion for Klipper.
Where it falls short: Cloud-tier features (more detection hours, cellular notifications) require a paid plan. Self-hosted mode works but takes more setup than the cloud version.
Pricing:
- Free: Self-hosted, unlimited detection hours
- Paid: Cloud tier with hosted detection, monthly subscription
Migrating from OctoPrint: Keep OctoPrint and install Obico as an OctoPrint plugin. Obico becomes an additional layer rather than a replacement.
Download: obico.io (works alongside OctoPrint, Mainsail, or Fluidd)
Bottom line: Pick Obico when you want spaghetti detection on top of an existing OctoPrint or Klipper install.
How to choose
- For Klipper printers, modern UI: Mainsail
- For Klipper on weaker Pis: Fluidd
- For a touchscreen at the printer: KlipperScreen
- For Duet mainboards: Duet Web Control
- For more than two printers from one host: Repetier-Server
- For cloud control without a Pi: AstroPrint
- For AI failure detection alongside any of the above: Obico
- Stay on OctoPrint if you depend on the plugin ecosystem (TimeLapse Plus, OctoLapse, OctoApp companion) and your printer is on Marlin firmware where Klipper isn’t a fit.
FAQ
Is OctoPrint dead?
No. OctoPrint is still actively maintained and the Patreon-funded development pace picked up in the last two years. It’s the Marlin printer’s default companion. What changed is that Klipper became dominant for performance tuning, and Mainsail and Fluidd are better fits for Klipper than OctoPrint is.
Can I run OctoPrint and Klipper together?
Yes, through the OctoPrint-Klipper plugin. That setup keeps OctoPrint’s plugins working while adding Klipper firmware features. For a from-scratch install, MainsailOS or FluiddPi (Klipper plus Moonraker plus the UI) is usually cleaner than retrofitting OctoPrint on top.
What’s the best free OctoPrint alternative?
Mainsail and Fluidd are both fully free, fully open-source, and the most actively developed options. Pick Mainsail for the polished UI, Fluidd for the lighter footprint.
Do I need a Raspberry Pi for OctoPrint or alternatives?
For OctoPrint, Mainsail, Fluidd, and KlipperScreen, yes (or another small Linux host like a Pi 4, Pi 5, or Orange Pi). AstroPrint’s cloud mode skips the Pi entirely. Duet Web Control runs on the Duet board itself. Repetier-Server runs on any Linux, Mac, or Windows machine.
Does Mainsail work with Marlin?
Mainsail is built for Klipper and the Moonraker API, so Marlin-only printers can’t drive it directly. Some users run a Klipper bridge on the host to translate, but it’s not the typical workflow. If your printer must stay on Marlin, OctoPrint remains the better network control layer.
