Overview

Four Profile Wizards organize setup around the printer, material, print style and supports, giving new users a structured way into configuration. KISSlicer also supports automatic support generation, variable layer height and resin slicing. Its file workflow starts with STL and produces G-code or SVG.

The main dividing line is extruder access: Free can be used with a multi-extruder printer, but only one extruder can be selected for a print. Pro removes that constraint and adds assignment controls for different parts of a job. KISSlicer remains a slicer, not a printer-control app, so users will need a separate tool to operate the printer.

Key features

Profile setup and portability: Users can share profiles, save print settings in a Project File and manage them with a version control system of their choice. Contributed printer profiles and a community forum for sharing them can help users adapt settings, while the archive and version-control options suit teams that want a record of print configurations.
Multi-material control: Pro supports multiple extruders and lets users assign them separately to the raft, supports, model and sub-meshes. That is a practical reason to upgrade for prints that divide material or functions across extruders; the free edition's one-extruder-per-print limit rules out those assignments.
Premium tools: Premium adds colorized meshes, texturing, dynamic density and gyroid infill, warp compensation and curved surfaces. These options give advanced users more ways to shape a print, but the purchase makes sense only if those controls justify paying beyond Pro.
Licensing and help: The license permits commercial use and installation on multiple personal computers, has no time or model-size limit, and prohibits reverse engineering. The maker says licensing does not phone home and Pro or Premium keys must not be shared. Users can turn to the community-run KISSlicer Talk forum for help from other users or the author, or contact the maker by form or email.

Pricing

KISSlicer uses a freemium model. The one-time prices make the edition choice straightforward, but Premium is an additional purchase over Pro rather than a substitute for a Pro key.

Plan	Price	What it includes	Best fit
Free	0.00 USD per free	Single extruder for all functions. Multi-extruder printers can be used, but only one extruder can be selected per print.	Users preparing single-extruder jobs or evaluating profile setup before buying.
Pro	42.00 USD per once	Unlocks multi-material prints; no time limit or model-size limit; commercial use permitted; installation on multiple personal computers.	Makers and teams that need multiple extruders and assignments across print components.
Premium Upgrade	40.00 USD per once	Upgrades to Premium and requires a current KISSlicer PRO Key.	Existing Pro users who want Premium features.
Premium	82.00 USD per once	All Pro functionality, with no time limit or model-size limit; commercial use permitted; installation on multiple personal computers. The price is identified as an early-adopter price.	New buyers who need Pro plus Premium tools.

Purchased keys are emailed to the PayPal account email within 48 hours. The paid licenses have no stated time or model-size cap, and the stated commercial-use and multi-computer permissions make them usable beyond a single personal project. Free is the lower-cost route, but its one-extruder-per-print limit is a material constraint for multi-material work.

Platforms

KISSlicer supports Windows, macOS and Linux. The download page also lists FreeBSD and Raspberry Pi versions. The broad desktop coverage suits mixed operating-system setups, though the software still needs to be paired with a separate printer-control app.

Who it's for

KISSlicer is a good fit for users who want structured setup, reusable print profiles and a path from single-extruder slicing to multi-material jobs. Pro is the relevant edition for multi-extruder printing; Premium is for users who also need its mesh, infill, warp-compensation or curved-surface controls. Those seeking printer operation within the slicer, or who do not need KISSlicer's profile and extruder controls, should consider another fit.

Pros and cons

Pro: Pro assigns extruders to raft, supports, model and sub-meshes, supporting more deliberate multi-material workflows.
Pro: Project Files, shareable profiles and user-chosen version control help preserve and circulate print settings.
Pro: The paid licenses permit commercial use and installation on multiple personal computers, with no time or model-size limit.
Con: Free permits only one selected extruder per print, so multi-extruder hardware alone does not unlock multi-material slicing.
Con: KISSlicer does not control the printer, requiring users to keep a separate control app in their workflow.
Con: Premium Upgrade is available only to current Pro key holders, so users who want Premium start with the $82.00 USD per once edition rather than the upgrade price.

Alternatives

For a free slicer with support tied to named printer models, QIDI Slicer lists the Q1 Pro, X-Max3, X-Plus3 and X-Smart3, and requires firmware V4.0.0 or above. Choose it when that supported QIDI hardware and firmware match your setup.

Sovol Slicer is a free option based on OrcaSlicer, and Sovol says its open-source hardware and software files are on GitHub. It is worth considering when that open-source software context is a priority.

Bambu Studio is a free slicer with an optional networking plugin and SD-card printing without the plugin. It suits users who want that plugin-optional workflow.

GrabCAD Print offers a free Standard plan billed as an annual subscription per user, with core print-preparation features and Stratasys printer support. Its listed platforms include Android, iOS, web and Windows, making it a candidate when those device options or Stratasys support matter; its Pro plan is 5000.00 USD per.

ideaMaker is a free alternative with no paid pricing tiers or usage limits stated for its plans; consider it if you want a free slicer option.

Lychee Slicer has a free Lite plan with limited multi-plate use and ads on export, alongside a Plus plan priced at €99.90 + local taxes. It is relevant if that plan structure and its Windows, macOS or Linux support better suit your needs.

OrcaSlicer is a free, open-source FDM slicer for Windows, macOS and Linux; choose it when those characteristics are the priority.

PrusaSlicer is a free, open-source slicer based on the Slic3r project, and is an alternative to consider for those attributes.

Browse more options in 3D Slicer Software or 3D Printing Software.

Verdict

Choose KISSlicer if you want profile-focused slicing with a clear upgrade path to multi-extruder assignments and, at Premium, a broader set of print controls. Its paid licensing is permissive for commercial use and multiple personal computers, but the free edition's extruder cap and the need for separate printer-control software are real workflow constraints. If those limits do not fit, a free alternative or a dedicated controller-and-slicer setup is the better choice.

	KISSlicer	Mainsail
Free plan	Yes	Yes
Free trial	No	No
Paid from	Free	Free
Open source	No	No
Platforms	Linux, macOS, Windows	api, Linux, self-hosted, Web
Free plan	Yes	Yes
Multi-material tools	Yes	—
Auto supports	—	No
Printer control	—	Yes
Print monitoring	—	Yes
Cloud slicing	—	No
Model repair	—	No

KISSlicer vs Mainsail

KISSlicer

Mainsail