No installation
Open one HTML file in your browser and start working. No administrator rights or installer required — it even runs from a USB drive.
SINGLE HTML FILE · NO INSTALLATION · NO NETWORK ACCESS
Huge CSV files, opened fast.
No installation, works offline
Time-series data analysis software
LOGADEC is time-series visualization and analysis software that runs in your web browser from a single file. It needs no installation and makes no network connections, so it works on isolated test benches and in environments with restricted network access. Please check your organization's rules before using it on company PCs.
Recommended: latest Google Chrome or Microsoft Edge
`Current` * `Voltage`.Learn more →
Shown with fictitious test data and the built-in demo data.
01
Built for environments where software is hard to bring in
FEATURESNo network access
LOGADEC never connects to the network. License verification happens entirely on your machine, so it runs in closed and air-gapped networks.
Large data, as is
Open large logs and hundreds of channels without splitting files. See the whole run, then zoom straight to the moment that matters.
Your IT review covers exactly one HTML file.
02
From download to first chart in three steps
GETTING STARTEDSTEP 1
Download
Save the zip file and extract it.
STEP 2
Open
Open the extracted HTML file in Google Chrome or Microsoft Edge. Nothing to configure.
STEP 3
Load your data
Click CSV/Excel and choose a file; delimiters and header rows are detected automatically.
03
From import to sharing, in one file
CAPABILITIESIMPORT
Import
- CSV, Excel (.xlsx/.xls/.xlsm) and NI TDMS
- Automatic detection of delimiters, encoding, header and unit rows
- Pick only the columns you need
VISUALIZE
Visualize
- Overlay, stacked and side-by-side views
- Axes group automatically, even with hundreds of similar channels
- XY plots, unit conversion and group-wide axis ranges
ANALYZE
Analyze
- FFT, STFT, wavelets and filters
- Change-point and outlier detection, correlation and lag analysis
- Curve fitting and formula-based calculated channels
- Your source files are never rewritten — results of calculations, conversions and filters are used for display and analysis within LOGADEC
SHARE
Share
- Save the view and analysis state to an .lgd file (trial and paid versions, in preparation)
- Anyone can open a received .lgd file in the free version
- Export images (PNG, JPEG, WebP, SVG) and CSV (free version too)
See every feature with screenshots →
Guides: How to open CSV files too large for Excel ／ How to plot a CSV file as a graph (free, no installation) ／ How to open and plot TDMS files
An .lgd file carries your data along with axis settings, calculations, analysis parameters and view range. Anyone can open it in the free version and see exactly what you saw — today or months from now. (Saving .lgd files will be available in the trial and paid versions.)
Creator (paid, in preparation)→
.lgd→Viewers (free, unlimited)Each viewer downloads the free version from this site — free, no registration.
05
Licensing
LICENSINGThe free version includes every viewing and analysis feature. A paid license lets you save and share results as .lgd files and work with more channels.
The trial and paid licenses are in preparation. Pricing and availability will be announced on this page.
| Free | Trial | Personal | Commercial | |
|---|---|---|---|---|
| For | Everyone | Evaluation before purchase | An individual buying with personal funds for their own use (business use allowed) | Organizations, one license per user |
| Term | Unlimited | 14 days | Perpetual + 1 year of updates | Perpetual + 1 year of updates |
| Channels you can load | 1,000 | No license limit | No license limit | No license limit |
| Save .lgd | — | ✓ | ✓ | ✓ |
| Get it | Download | In preparation | In preparation | In preparation |
Keeps working after updates end
Updates are a right to receive new versions. After they lapse, any version whose build date is on or before the end date keeps working (the build date is shown in the app's About screen).
For schools and universities
We plan to offer free licenses for teaching and research to applicants with an institutional email address, starting when sales open.
06
Built to last
BUILT TO LASTNo license server
License keys are verified on your machine. No license server is involved, so use does not depend on the state of any server on our side.
Your data stays in your files
Your data stays in your own files. No cloud shutdown can lock you out of it.
Automated testing before release
Every release goes through thousands of automated tests. Each bug fix adds a test that reproduces the original issue.
07
FAQ
FAQDoes it work on computers with no network connection?
Yes. LOGADEC makes no network connections, and license verification happens on your machine.
Do I need to install it or have admin rights?
Neither. Just open the HTML file in your browser.
Which browsers are supported?
We recommend the latest Google Chrome or Microsoft Edge. Firefox and Safari also work, but saving downloads a new file instead of overwriting the existing one.
How much data can it handle?
Large CSV files open without splitting. How much you can handle depends on the number of columns, the data, the memory of your computer and the browser. The free version loads up to 1,000 channels.
Can I share my analysis with colleagues?
Once the trial and paid licenses are available, you can save your analysis to an .lgd file and share it; recipients open it with the free version. For now, you can share exported images and CSV files.
What does an .lgd file contain?
The loaded data (including hidden series) and your display and analysis settings. Values are stored before filters and unit conversions are applied; filters, conversions and formulas are stored as settings (formulas as their definitions) and recalculated when the file is opened, so you see the same screen. It is not a backup of the original CSV or Excel file.
Can my colleagues use the free version too?
Yes. Each person downloads the free version from this site (free, no registration). Giving the free version's file to others, or placing it where others can access it, is not permitted under the license agreement (Articles 5 and 6).
What happens when my update period ends?
Nothing stops working. Any version whose build date is on or before the end of your update period remains yours to use. The build date is shown in the app's About screen.
Can LOGADEC change my original data?
No. The files you load are never rewritten. Results of calculations, unit conversions and filters are used for display and analysis within LOGADEC.
Can it open CSV files too large for Excel?
Yes. There is no worksheet-style row limit (Excel stops at 1,048,576 rows), so CSV files load without splitting. How much you can handle depends on the number of columns, the data, your computer's memory and the browser. See how to open CSV files too large for Excel.
Can it open NI TDMS files?
Yes. Each numeric channel is loaded as a "group/channel" column. TDMS files saved in the DAQmx raw data format are not supported. See how to open TDMS files.
Can I try it without downloading?
Yes. Try it in your browser starts the same LOGADEC as the download, with no registration.