Spikelog

Spikelog is a metrics logging tool designed for developers and individuals seeking a lightweight way to track and visualize numeric data over time. The service addresses the need for simple observability in projects where full-featured monitoring stacks are unnecessary, allowing users to log a number and instantly generate a chart with minimal setup.

The platform operates through a straightforward API: users sign in, create a project to obtain an API key, and then POST a number along with a chart name to Spikelog's endpoint. Once a value is sent, the corresponding chart is generated automatically and made available on the user's dashboard. This process requires no additional configuration, exporters, agents, or custom dashboards, and does not involve learning a query language. Spikelog is compatible with any environment capable of making HTTP requests, such as cron jobs, scripts, background workers, or general application code, and provides code examples for languages including Python, TypeScript, JavaScript, Go, Rust, and Ruby. Users can also utilize cURL for direct API access.

An AI-powered feature is available, allowing users to paste prompts into tools like Cursor, Copilot, or Claude. The AI identifies meaningful signals in codebases and automatically adds counters that send metrics to Spikelog, streamlining the process of instrumenting applications for tracking.

Spikelog offers a free plan that includes up to 10 charts with 1,000 data points each, requiring no credit card and imposing no time-limited trial period. The most recent 1,000 points per chart are retained, and daily summaries are preserved indefinitely, ensuring that trends remain accessible even as new data is logged. The tool is positioned for side projects, MVPs, and small production systems, emphasizing simplicity and ease of use for users who need to monitor a few key metrics without the complexity of traditional observability solutions.