Open the programme you've been sent
Open Microsoft Project .mpp and Primavera P6 .xer programmes without either installed. See the Gantt chart with the critical path, filter to what matters this week, look up any activity, and print it or save it as a PDF. Free, on your PC, no account.
Summary groups you can fold, bars, milestones and links, by day, week or month, with today and the data date marked.
Critical activities stand out in the table and the chart, with total and free float shown as saved in the file.
Microsoft Project .mpp and Project XML, Primavera P6 .xer and P6 XML. Double-click a file or drop it on the window.
Critical only, milestones, not finished, a date window or an activity code such as a trade, plus search by name, ID or activity code.
The Gantt as you see it, on A3 or A4 landscape pages with the title, data date and a key - ready to send.
Nothing is rescheduled or saved back. Dates, float and progress are exactly what the planner saved.
Windows 10/11 · Free to view · Nothing uploaded · No account
A Primavera P6 programme in dark mode with an activity's logic, and a four-week lookahead for one trade.
Primavera P6 .xer files, in light or dark
A lookahead for one trade (Pro)
Viewing stays free. Gantt Viewer Pro is a one-off upgrade inside the app for site managers, QSs and planners who check programmes week in, week out, bought through the Microsoft Store - no subscription, no account. Try it free for 7 days.
Baseline bars under every activity, and float drawn as a band, so slippage and slack are obvious at a glance.
Completion moved +7 days? See every activity added, removed or moved, logic and float changes, and the old bars dashed.
A two-, three-, four- or six-week lookahead for the whole job or one trade, as a PDF or Excel sheet for the site meeting.
Ten quality checks: open ends, leads and lags, hard constraints, high and negative float, long durations, dates left behind the data date and more.
What clauses 31.2, 31.3 and 32.1 ask a programme to show, checked against the file, with the reply date - as a PDF.
Every Pro tool free for 7 days, once per PC - no payment and no account. Then a one-off upgrade through the Microsoft Store.
| FEATURE | FREE | PRO £19.99 |
|---|---|---|
| Open .mpp, .xer and Project/P6 XML files | Yes | Yes |
| Gantt chart with the critical path | Yes | Yes |
| Filters, search, zoom and activity details | Yes | Yes |
| Print and save the Gantt as PDF | Yes | Yes |
| Baseline bars and float bands | No | Yes |
| Compare two revisions | No | Yes |
| Lookaheads as PDF or Excel | No | Yes |
| Schedule checks and NEC4 checklist | No | Yes |
| Excel and .ics export, saved views | No | Yes |
Compare two revisions: what moved, what was added and removed
Yes. Opening and viewing .mpp, .xer and Project XML programmes is free: the Gantt chart with the critical path, filters, search, zoom, activity details, and printing or saving the Gantt as a PDF. Gantt Viewer Pro is an optional one-off upgrade for baselines and float, comparing revisions, lookaheads, schedule checks, the NEC4 checklist and Excel exports, with a 7-day free trial.
No. Gantt Viewer reads the files itself, so you can open a programme someone has emailed you without a licence for the software it was made in.
Microsoft Project .mpp, .mpt and .mpx files and Project XML (.xml) exports, and Primavera P6 .xer and P6 XML (.xml/.pmxml) exports. Password-protected .mpp files need opening and saving without the password first.
No - it's a viewer. Dates, durations, float and the critical path are shown exactly as they were saved, and nothing is rescheduled. The only file it writes is the PDF, Excel or calendar export you ask for.
With Pro, open the latest programme and pick the earlier revision. You see the completion date movement, every activity that was added, removed or moved, logic changes and float changes, and the earlier bars drawn dashed in the Gantt. The list exports to Excel.
A guide to what clauses 31.2, 31.3 and 32.1 of the NEC4 Engineering and Construction Contract ask a programme to show, checked against the file: the completion date, key dates, float, resources, progress and the two-week reply clock. It's a guide for the Project Manager and the planner, not a judgement on whether the programme is practicable.
No. Everything happens on your PC and there's no account to create.
