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IoTPlotter
What IoTPlotter is
IoTPlotter is a free web service and API for collecting readings from internet-connected IoT devices, storing them in feeds, and plotting them over long periods. Its API supports writing and reading feed data in JSON and CSV formats, and simple APIs can connect almost any internet-enabled device. Responsive graphs help visualize measurements, while retained history allows comparison between older and newer readings. IoTPlotter says data sent to the service remains owned by the user. Feed data can generally be read without an API key, but most other requests require a feed-specific key in HTTP headers. Accounts with an unconfirmed email address are limited to one request every 15 seconds per API key. Each API response contains at most one day of feed data, so narrower periods must be selected separately. The service is in beta and under active development. Its Free plan costs nothing, with no specific usage limits stated.
Who it suits
IoTPlotter suits makers collecting and graphing data from connected devices through a web API. It is useful for projects needing long-term history and JSON or CSV feed access.
What it does well
- Free plan costs nothing
- Supports JSON and CSV feed data
- Long-term history enables comparisons
- Responsive graphs visualize collected readings
- Users retain ownership of sent data
What to know first
- Beta software remains under active development
- Unconfirmed emails face 15-second request limits
- API responses contain only one day of data
- Most API requests require feed-specific keys
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Completely free; no specific usage limits stated | Free |
As iotplotter.com lists them, read 11 Oct 2026. The maker's own page has the final word.
Verdict
IoTPlotter provides free device-data collection, storage, and graphing through web and API access. Its request pacing and one-day response limits matter when building larger or more frequent data workflows.
Facts from IoTPlotter's own pages
- API authentication
- Most API requests require a feed-specific API key in the HTTP headers; generally, read-only requests do not. · iotplotter.com, 11 Oct 2026
- API formats
- The API documentation describes writing and reading feed data in JSON and CSV formats. · iotplotter.com, 11 Oct 2026
- Audience
- IoTPlotter says it was created for the maker community. · iotplotter.com, 11 Oct 2026
- Charts
- The site says its responsive graphs let users visualize data intuitively. · iotplotter.com, 11 Oct 2026
- Data access
- The API documentation says feed data can be read without an API key in general, while most other requests require one. · iotplotter.com, 11 Oct 2026
- Data ownership
- The site says data sent to IoTPlotter remains the user's. · iotplotter.com, 11 Oct 2026
- Data sources
- IoT devices; HTTP API; JSON; CSV · iotplotter.com, 20 Sept 2026
- Development status
- IoTPlotter says it is in beta and still in active development. · iotplotter.com, 11 Oct 2026
- Device connections
- The site says simple APIs can connect almost any internet-enabled device. · iotplotter.com, 11 Oct 2026
- Free plan
- Yes · iotplotter.com, 20 Sept 2026
- History
- Long-term history lets users compare old data with new data. · iotplotter.com, 11 Oct 2026
- Platform
- web · iotplotter.com, 20 Sept 2026
- Purpose
- IoTPlotter collects data from IoT devices for long-term graph plotting and storage. · iotplotter.com, 11 Oct 2026
- Rate limit
- The documentation says users with an unconfirmed email are limited to one request per 15-second period per API key. · iotplotter.com, 11 Oct 2026
- Read limit
- The API returns only one day of feed data per request, so users must narrow a full day's results on their own when they need a specific timeframe. · iotplotter.com, 11 Oct 2026
Where IoTPlotter stands on Freedom251
- Data Visualization Software#62 of 98