iVistaar

iVistaar

From localhost concept to a useful internal product.

Connect a project folder on your Windows Server. Deploy. Get an organization URL — without Git, without sending code outside your network.

Download v0.6.14

Three steps. Then you’re live.

Built for locked-down Windows shops where Render and public PaaS aren’t an option.

  1. 01

    Install on IIS

    Unzip on the server and run the admin installer. No Git required on the machine.

  2. 02

    Connect a folder

    Point iVistaar at C:\Projects\your-app — or a reachable UNC path.

  3. 03

    Share the URL

    Your team opens an internal site. Redeploy when the code changes — or let auto-deploy watch for you.

After you download

Do these on the Windows Server. This is the short path — the zip also includes INSTALL.md.

  1. 01

    Extract the zip

    Unzip to a permanent folder, for example C:\iVistaar or C:\software\ivistaar.

  2. 02

    Run the service installer

    Open PowerShell as Administrator, then:

    cd C:\iVistaar
.\scripts\install-admin-service.cmd -Port 8080

    Prefer this over plain IIS hosting — it runs admin and apps as Waitress scheduled tasks.

  3. 03

    Sign in and secure the admin

    Open http://localhost:8080/ — login admin / iV!5taar#Ctrl2026. Go to Account and change the password before wider exposure.

  4. 04

    Connect a project folder

    In the admin UI: Connect → path to your app (or unzip a sample under sample-apps\) → Deploy. Open the URL under /apps/<slug>/.

Need the long form (prerequisites, upgrades, troubleshooting)? Open the install guide · INSTALL.md

Like Render — for your intranet.

One control plane for Flask, Dash, FastAPI, Streamlit, and Gradio apps that usually die on random localhost ports.

Common deploy questions

Real issues from Windows installs — so you spend less time in Event Viewer.

IIS install returns HTTP 500 with empty logs

Use service mode instead: scripts\install-admin-service.cmd -Port 8080. HttpPlatformHandler often fails when Python lives under a user AppData folder.

pip fails on pandas (Meson / vswhere / Visual Studio)

There is no wheel for your Python version, so pip tried to compile from source. Prefer Python 3.11–3.12, or bump pins (e.g. pandas>=2.3.3 on 3.14). You should not need Visual Studio Build Tools.

Dash stuck on “Loading…” / DashRenderer is not defined

Asset URLs must be under /apps/<slug>/. Use entrypoint run:server (or app:server), set server = app.server, redeploy on a current release, then hard-refresh. iVistaar injects the public path prefix for you.

NameError: dash is not defined

You imported from dash import Dash but called dash.Dash(...). Use Dash(...), or add import dash.

Wrong entrypoint for Dash / “cannot import name app”

Dash needs the Flask server object: server = app.server and Connect entrypoint app:server or run:server matching your filename — not app:app unless that attribute is a WSGI app.

WinError 32 on runtime.log during redeploy

The app process still held the log file open. Current releases stop the app task before syncing. Stop iVistaarApp-<slug> and redeploy, or upgrade past 0.6.9.

Installer picks Python 2.7

Python 2.7 is not supported. Install Python 3.10+ and re-run the installer, or pass -PythonPath to install-admin-service.cmd.

Streamlit / Gradio loads but never becomes interactive

Need WebSockets under /apps/<slug>/. Use service mode on iVistaar 0.6.14+ (install-admin-service.cmd), Redeploy the app, hard-refresh. The public gateway splices WebSocket upgrades to the app port.

Cannot add a fourth project

The free demo includes three projects. Activate a yearly SPC under License, or email [email protected].

Licensing — try it, then grow.

Install the full product. The free demo lets you run up to three sites. Need more? Unlock with a yearly subscription code.

  1. 01

    Install everything

    Download and install iVistaar on your Windows Server. You get the complete control plane — not a cut-down trial build.

  2. 02

    Use three sites free

    Connect and deploy up to three projects. Enough to prove the workflow with real apps on your intranet.

  3. 03

    Unlock unlimited with SPC

    When you need a fourth site, contact the iVistaar team for a yearly SPC (subscription product code). Paste it in the License page — unlimited projects until renewal.

Questions or ready for a license? [email protected]

Get iVistaar

Download the Windows Server package. Your browser will save the zip, then this page jumps to After you download with the install steps.

Download iVistaar-0.6.14.zip See install steps

Requires Windows Server, IIS tools, and Python 3.10+. Free demo includes three sites. Default login is for first setup only — change it under Account.