Comparison
VizForge vs Deneb (Vega-Lite)
An honest 2026 comparison. Includes the dimensions where Deneb (Vega-Lite) is the better choice.
Deneb is a free, open-source Power BI custom visual that lets you render Vega-Lite and Vega specifications inside Power BI. It's brilliant and popular with the data-viz-literate crowd — if you know Vega-Lite's JSON specification language, Deneb gives you essentially unlimited design flexibility for free.
The catch is the learning curve. Vega-Lite is a declarative visualization grammar with its own vocabulary (encodings, transforms, mark types). Analysts comfortable with DAX often hit a wall with Vega-Lite's JSON structure. Every new chart is a JSON spec you compose and debug.
VizForge does something different: you describe what you want in plain English, our AI writes a standalone TypeScript .pbiviz (not a Vega-Lite spec), and you download the finished file. No new grammar to learn, no spec debugging, and the output is a first-class custom visual with its own formatting pane.
For analysts who already know Vega-Lite (or want to invest in learning it), Deneb is excellent and free. For analysts who want to produce custom visuals without learning a declarative visualization language, VizForge is the shortcut.
Deneb (Vega-Lite) pricing model
Free and open-source (MIT-licensed).
Side-by-side comparison
| Dimension | Deneb (Vega-Lite) | VizForge |
|---|---|---|
| Cost | Free forever | Free tier (3 visuals/month) + paid plans |
| Approach | Write Vega-Lite JSON specs inside Power BI | Plain English prompt → AI generates TypeScript visual |
| Learning curve | Vega-Lite grammar (meaningful investment) | None — natural language |
| Output format | Vega-Lite JSON stored in the report | Standalone .pbiviz — portable, reusable |
| Flexibility ceiling | Extremely high (full Vega-Lite + Vega) | High — AI handles anything describable; source editable |
| Reusability | Copy-paste JSON between reports | Import the .pbiviz into any report |
| Debug experience | Error messages from Vega runtime | Live preview with sample data before download |
When Deneb (Vega-Lite) is the better choice
- You already know Vega-Lite (or want to learn) — Deneb gives you unlimited flexibility for free.
- Your team has data-viz expertise and prefers declarative specs over imperative code.
- You build custom visualizations frequently and the learning curve amortizes.
- Budget is truly zero.
When VizForge is the better choice
- You don't know Vega-Lite and don't want to learn another grammar.
- You want a reusable .pbiviz file you can share across reports and teams.
- You want AI to handle the visualization design, not a spec syntax.
- You value time-to-visual (minutes) over theoretical flexibility.
Can you use both?
Deneb specs don't export as .pbiviz — they live inside a specific Deneb visual in a specific report. VizForge-generated visuals are portable .pbiviz files. If you've built Deneb specs you want as standalone visuals, describe the Deneb design to VizForge and we'll generate a .pbiviz that matches.
3 visuals per month on the free plan. No credit card required.
FAQ
Is Deneb really free?
Yes, fully. MIT license, maintained by Daniel Marsh-Patrick. No subscription, no premium tier.
Can VizForge generate Vega-Lite specs instead of .pbiviz?
Not today. Our output is always a standalone .pbiviz. If you want Vega-Lite, use Deneb directly — it's a great tool for that workflow.
Which produces better-looking charts?
Depends on the prompt / spec quality. Deneb has a higher ceiling (Vega-Lite's grammar is expressive); VizForge has a lower floor (natural language is easier to start with).
Compare with another tool?
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