Chartt vs DataLens
Chartt
chartt.ioDataLens
bran9910.github.ioSide by side
| Figure | Chartt | DataLens |
|---|---|---|
| Price from | $7/mo | — |
| Free plan | Yes | — |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 4 | 0 |
| Spec score · AI Data Analysis Tools | 8.8 (#1) | 7.4 (#20) |
| Exports | PNG and CSV exports are included on every plan, while higher tiers add all export types and custom themes. | Users can export a PDF report and download filtered CSV data. |
Plans
In their own words
Chartt
Chartt is a web-based AI analyst for CSV, Excel, and plain-text files. Upload a file and ask questions in plain language; Chartt infers column types, units, and date ranges, then selects charts, tables, sparklines, or breakdowns to present answers with numbers and explanations. Chart cards can be pinned to dashboards that refresh when source files change. The service also surfaces spikes, dips, and unexpected segments with summaries, and shared chart, chat, or dashboard links can point readers back to source rows or files.
Chartt offers a free plan with 100 credits per month, one data source, files under 100 MB, and 30-day chat history. Paid plans start at $7 a month, billed annually at $84/year. The maker says files and database contents are encrypted at rest, data is encrypted in transit, and customer data is not used to train AI models; relevant uploads may be sent to OpenAI and Google Gemini for analysis. Queries pause when credits run out until the next billing cycle or plan upgrade.
DataLens
DataLens reads CSV files in a browser, profiles their columns, and turns the analysis into an interactive report. It accepts drag-and-drop multi-file imports and clipboard pastes, and detects numeric, categorical, and datetime columns. Its eight chart types are bar, line, pie, donut, scatter, radar, histogram, and box plot. Pearson correlations appear in a heatmap; text insights can surface outliers, trends, top-k segments, and cross-correlations. Natural-language queries are supported, and an assistant can connect to Ollama, OpenRouter, Groq, or an OpenAI-compatible endpoint. The site says CSV data stays in the browser, while AI requests go from the browser tab to the configured provider. DataLens can run offline without installation or a backend, either in a browser or from a local HTML file or HTTP server. The maker describes CSV uploads up to approximately 50 MB. Reports export to PDF, and filtered data can be downloaded as CSV. The interface is available in French and English. DataLens is free and open source under the MIT License.