Open-source construction planning with Gantt charts, critical path, resources and levelling, baselines and progress — and native IFC 4.3 as the file format. One task grid for your whole schedule: next to the Gantt and as a full table view, edited like a spreadsheet. Also opens MS Project (.mpp) files natively. On your desktop and straight in the browser.
The task list beside the Gantt and the full Table view are now the same table: the same columns, the same shortcuts, the same way of editing — wherever you work. It stays fluid at thousands of tasks, you move from cell to cell with the keyboard, and you paste whole blocks in from your spreadsheet in one go. Dependencies are now edited right in the cell; the separate Relations tab had become redundant and has been retired.
We are looking for testers: work planners, schedulers, project leads and BIM coordinators. Try Open Planner Studio right in your browser and tell us what you think — your feedback helps shape where it goes.
Rather not install anything? Open Planner Studio also runs fully in your browser — including opening and saving files.
An MCP server is built into the app, so an AI client such as Claude Code can read and edit your schedule directly. Switch it on in the AI tab, with a pause button, read-only mode and automatic backups.
Interactive HTML5 Canvas Gantt with drag and drop, zoom and timeline navigation. Drag a whole selection vertically, collapse non-working days out of the timeline and select with Ctrl+click. Week numbers in the header.
Automatic critical path calculation with float, near-critical work, multiple critical paths and deadline analysis. A "dates as recorded" view shows a file exactly as it recorded its own dates, when those differ from recalculation.
Hierarchical task structure with collapsible chapters. Beside the Gantt and in the full Table view you work in the same table: cell to cell with the keyboard, blocks pasted in from your spreadsheet, dependencies in the cell, columns you choose and pin, rows you drag. It stays fluid at thousands of tasks too.
Alongside the built-in types you can define your own task types. They are reusable on your installation, and their name and identity travel with the project — so what a task is stays readable after an IFC exchange or on another machine.
Once your project has a file the app is allowed to write to, you can have it written back periodically — with no dialog. It deliberately stays separate from crash recovery: a document that has never been saved is never quietly overwritten, and the recovery snapshot keeps running alongside it.
Your schedule is an IFC file (buildingSMART standard). With a built-in IFC code editor to generate and apply.
Labour, equipment and subcontractors with a histogram and automatic levelling of overallocation. Move assignments while keeping units and curve.
Share one resource pool across several projects. The library is the source, the project shows what it actually uses, and deviations are flagged so you can resolve them. The occupancy overview adds up every open project — as a table and as a histogram — and marks the days where the committed load exceeds the available capacity.
Capture multiple baselines and record progress with a status date, actual start and a cleaned-up progress line.
Construction-specific calendars: public holidays, building recess, frost delay, inspection moments and phasing, plus a configurable break in the daily pattern. Per task you choose whether the duration counts in days or in hours; an hour task consumes real working minutes on its own calendar instead of being quietly converted to whole days.
Runs natively on Windows, macOS and Linux, but also fully in the browser — including open, save, auto-save and crash recovery.
Import and export IFC, CSV, MS Project (.xml) and Primavera P6 (.xml) — no intermediate steps or conversion tools.
Opens .mpp files natively, with no Microsoft Project or converter involved — date-faithful to the minute across a 216-file test corpus. Split tasks, resource leveling, timephased assignments and manually scheduled tasks are read and shown as interrupted bars in the Gantt, print preview and PDF export; nothing from the source file is lost, even after you edit it.
Your schedule is an open IFC 4.3 file. BIM software can lay it directly alongside your building model for 4D analysis of the construction sequence, with no conversion needed.
Live print preview in the ribbon and export to a real high-resolution PDF (±220 DPI). Paper up to A2, a baseline overlay, a status or progress line, bars coloured by task, category or resource, and non-working days you can compress. Configurable font size, a header that repeats on every page and a timeline that may span several pages. Your settings are remembered.
Press F1 for an offline manual, available in all fourteen languages: quick start, fifteen practical guides — including resource libraries and connecting an AI assistant — and sixteen reference pages, plus eight sample projects to practise on.
Full overview via Ctrl+/ and rich right-click menus on the task row, Gantt bar, canvas and band header. Per-task notes with a tickable checklist.
Nederlands, English, Français, Deutsch, Español, Italiano, Português, Polski, Türkçe, 中文, 日本語, 한국어 and RTL support for العربية and فارسی.
Familiar Office-style ribbon with tabs: Home, Planning, Resources, View, Settings, Table, IFC and Report — plus an AI tab once AI mode is on. Relation actions sit in the task groups themselves.
Native desktop app with a Rust backend for Windows, macOS and Linux.
Component-based UI with Zustand + Immer for state management.
Gantt rendering. TailwindCSS 4 for styling, Vite 7 as the build.
Yes. Open Planner Studio opens MS Project (.mpp) files natively — no Microsoft Project or external converter needed — and is date-faithful to the minute across a 216-file test corpus; split tasks, leveling delay, timephased assignments and manually scheduled tasks are read and shown. The app also imports and exports MS Project (.xml) and Primavera P6 (.xml) directly, with no intermediate step or conversion tool. IFC and CSV are supported as well.
No. The full application runs in the browser, including opening and saving files, auto-save and crash recovery. In Chromium browsers (Chrome, Edge, Brave, Opera, Vivaldi) Ctrl+S saves back over the same file, just like on the desktop; Firefox and Safari fall back to the file picker. If you do want to install, there are builds for Windows, macOS and Linux.
IFC 4.3, the open buildingSMART standard. Your schedule *is* an IFC file — there is no proprietary, closed format. That keeps your data readable outside this application, and lets BIM software lay your schedule directly alongside an IFC building model for 4D analysis of the construction sequence.
Since v2026.7.13 the app ships a built-in MCP server. An AI client such as Claude Code can read your schedule through it — project overview, tasks, critical path, resources, histogram, calendars and baselines — and edit it too. You switch the bridge on in the AI tab and stay in control: there is a pause button, a read-only mode, automatic backups and an activity panel listing every call the assistant made.
Nothing. The application is free and open source under the LGPL-3.0 licence. No subscription, no per-seat licence fees.
Windows (.exe), macOS (universal .dmg, both Intel and Apple Silicon) and Linux (.deb, .rpm, AppImage and snap). Plus fully in the browser.
Yes. You set up construction-specific calendars with public holidays, building recess, frost delay, inspection moments and phasing, and you can plan down to hour level. The interface is available in fourteen languages.
Yes. The critical path is calculated automatically, with float, near-critical work, multiple critical paths and deadline analysis. Resources get a histogram with automatic levelling of overallocation, and multiple baselines let you track deviations from the original plan.