A chart is easier to use when its message is clear.
OGAD (Off Grid AI Desktop) lets you ask a local vision model to explain a chart on your computer. You can identify the axes, describe the visible trend and draft a plain-English explanation without sending the chart to a cloud AI service. Download the app and a compatible vision model first.
Download OGAD for Mac or Windows
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Start with what the chart actually shows
Use one chart with readable axis labels and a visible legend. Keep the title and units in the image. Removing those details can turn a reasonable-looking answer into the wrong explanation.
Describe this chart in three parts: the axes and units, the main visible pattern, and what the chart does not establish. Read labels before drawing conclusions. Mark uncertain values instead of inventing exact numbers.
The useful result is a first draft you can check. You supply the image and the question; the model supplies an answer for review.
Choose a model that can read images
Open Models and choose a local vision-capable model that fits your computer. The chat interface identifies options such as Qwen3-VL 2B or Gemma E4B when image support is missing. Download the complete model and its required vision component, then select it for the chat.
A text-only model cannot inspect the image. An image-generation model creates pictures; it is not the model you need for this analysis. Local chat and vision are part of OGAD’s free desktop app.
Use the model recommendations shown for your hardware. The installed file size is not the amount of working memory the model needs while answering. If a large model cannot load, choose a smaller supported vision option and close other heavy applications.
Get your first answer
- Save the image locally. Crop excess background, but keep the text and context needed for the task.
- In OGAD, open Chat and select the downloaded local vision model.
- Open the + composer menu and select Add image.
- Choose the file and check the attachment previews.
- Send the example question above, adapted to your image.
- Compare the answer with the original before you reuse it.
If the small text is unreadable, attach a close crop of that section and ask again. More confident wording in the prompt cannot restore detail absent from the image.
Separate the chart’s reading from its interpretation
Start by asking the model to list the chart title, horizontal axis, vertical axis, units, and legend. Compare that list with the image. If the vertical axis shows percentages, an answer about a change in the number of customers is already using the wrong measure.
Next, ask for observations only: which series rises, where a change occurs, and whether a marked value is readable. Keep possible causes out of this first pass. A line rising after an event does not establish that the event caused the increase.
For a chart with two lines, try this follow-up:
Compare the direction of the two series. Use the legend names. Do not estimate exact values between labelled points. Separate visible differences from explanations that would need more data.
Check the scale before accepting a dramatic description. A cropped axis, a nonzero starting point, or different units on two axes can change what a visual gap means. If those details are unclear, obtain a better source image rather than asking for a more certain answer.
Then decide what a colleague needs from the explanation. A two-sentence summary might name the measure and the main visible change, followed by one question the chart cannot answer. For an exact percentage change or total, use the original dataset and calculate from its values. The image-based explanation helps you communicate the chart; it does not recreate missing data.
Keep the analysis on your computer
Select the local model and use files already on your computer. You can disconnect internet access after setup and send a short image question to check the local route. A remote model or an online tool changes that data path, so leave those out of this workflow.
Local analysis avoids sending the image to a cloud AI provider. Separate file backup and device-sync settings still apply if you have enabled them.
When the answer is not useful
| Symptom | Useful next step |
|---|---|
| Image input is unavailable | Select a vision model and complete its required downloads |
| Small text is misread | Attach a sharper crop of the relevant area |
| The answer is vague | Ask about one visible detail or one concrete decision |
| The model invents details | Request visible evidence and verify it against the source |
| The model cannot load | Try a smaller supported model that fits available memory |
These steps use the image-input workflow in OGAD 0.0.51. Keep the app current and use a complete local model.
Try it with your own image
Download OGAD, choose a vision model and explain one chart you already need to present. Keep the source beside the answer. You get a useful starting point while the image stays within your local analysis workflow.