Screaming Frog SEO Spider alternatives: 6 free & open-source picks
Compare recorded free and open-source options, their capabilities and operating requirements. Source dates are shown below; licenses, hosted limits and project activity can change.
A proper cross-platform crawler with JavaScript rendering, reports and raw exports; no license key hiding under the lily pad.
licenseMIT
runson your machine
installDownload a prebuilt desktop or CLI binary for Windows, macOS or Linux
enginesOptional OpenAI, Anthropic, Gemini, vLLM, Ollama, LM Studio or any OpenAI-compatible endpoint
dataRuns locally and writes project results plus HTML, JSON or text reports and exports to the user's disk
the catch vs Screaming Frog SEO SpiderIt covers the common audit job, but it still has fewer deeply mature crawl controls, custom extraction workflows and integrations than Screaming Frog.
setupNone for ordinary crawling; JavaScript rendering needs Chrome or Chromium, or the one-time headless-shell download
facts verified 2026-08-11
An unlimited browser-based crawler with JavaScript rendering; free, capable and one Docker stack away from useful.
licenseMIT
runsyour server
installDocker Compose, or a Python environment plus Playwright
dataSettings live in browser localStorage; each browser session has isolated crawl data that expires after one hour unless exported as CSV, JSON or XML
the catch vs Screaming Frog SEO SpiderIt requires a Docker or Python and Playwright stack and offers less advanced crawl configuration, exports and integrations.
setupDocker or Python plus Playwright is required, and local mode has no authentication unless the operator adds it
facts verified 2026-08-11
A workmanlike crawler with issue severity, audit history and exports; less microscope, more dependable checklist.
licenseMIT
runsyour server
installDocker Compose with MySQL 8.4, then expose the web UI behind HTTPS
dataSites, crawl results and audit history live in the self-hosted MySQL database
the catch vs Screaming Frog SEO SpiderIt is a dependable checklist crawler but gives up Screaming Frog's raw-data depth, granular configuration, extraction and integration breadth.
setupDocker, MySQL and a reverse proxy are required; its default exposed port is plain HTTP
facts verified 2026-08-11
A finished desktop crawler with 200 checks, JavaScript rendering, projects and exports; unusually close to the actual frog.
licenseMIT
runson your machine
installWindows installer or portable build, macOS DMG, or Linux AppImage, deb or rpm
enginesOptional OpenAI, Anthropic and local Ollama; optional GSC, GA4, PageSpeed, Ahrefs, Moz, Semrush, Majestic and MCP connections
dataLocal SQLite WAL project files (.seoproject), optionally AES-256-GCM encrypted; exports include Excel, CSV, JSON, XML, HTML, sitemaps, Google Sheets and BigQuery
the catch vs Screaming Frog SEO SpiderIt is less battle-tested and has fewer mature configuration, extraction and integration workflows than Screaming Frog.
setupThe prebuilt apps install normally, but the macOS build may require bypassing Gatekeeper for an unsigned application
facts verified 2026-08-11
Unlimited local crawling, JavaScript rendering and crawl diffs in a native Mac app; other operating systems get nothing.
licenseproprietary, free
runson your machine
installDownload and install the native universal macOS app
enginesA local MCP server connects to Claude Code, Cursor, Codex, Windsurf and other MCP clients
dataCrawl projects and history live in a local SQLite database on the Mac; there is no hosted account or cloud sync
the catch vs Screaming Frog SEO SpiderIt is macOS-only, lacks JavaScript rendering and offers far fewer crawl controls, extraction options, reports and integrations than Screaming Frog.
setupmacOS only
facts verified 2026-08-11
The same frog, permanently free for 500 URLs; JavaScript rendering, saved crawls and scheduling stay licensed.
licenseproprietary, free
runson your machine
installNative Windows, macOS or Linux installer
dataCrawl data lives in the local running session and can be exported to spreadsheets; the free edition cannot save and reopen crawl projects
setup✓ installs clean
the catch vs Screaming Frog SEO SpiderThe permanent free edition stops at 500 URLs and withholds JavaScript rendering, saved crawls, scheduling, custom extraction and API integrations.
facts verified 2026-08-11
latest recorded source check 2026-08-11 · check current terms at the source
RustySEOThe feature list is excellent; v0.3.9, unsigned binaries and an explicit buggy warning make it a watchlist item.
| tool | license | running it | platforms | stars | active |
|---|---|---|---|---|---|
| SiteOne Crawler | MIT | one-click install | windows, macos, linux, cli | 841 | 2026-06 |
| LibreCrawl | MIT | docker to self-host | web, self-hosted | 827 | 2026-06 |
| SEOnaut | MIT | docker to self-host | web, self-hosted | 751 | 2026-05 |
| FreeCrawl | MIT | one-click install | windows, macos, linux, cli | 87 | 2026-07 |
| Crawly | proprietary, free | one-click install | macos | — | — |
| Screaming Frog SEO Spider Free | proprietary, free | one-click install | windows, macos, linux, cli | — | — |
People still pay for Screaming Frog SEO Spider because a crawler is buildable; professionals pay for years of edge-case handling and reports they can trust with clients. The recurring cost buys robots handling, rendering, canonicalization, deduplication, crawl traps, rule maintenance, scheduling, storage, and false positives, not just the visible interface. The recorded subscription totals $282.6 a year before any costs of an alternative.
Questions about these alternatives
Is there a free alternative to Screaming Frog SEO Spider?
Yes: SiteOne Crawler, LibreCrawl, SEOnaut and 3 more. These are recorded free or open-source options. Compare their feature limits, licenses, hosting costs and current availability before choosing.
Should I just build my own Screaming Frog SEO Spider?
Our verdict is YES. The core loop is small enough for a capable coding agent to produce a useful local version in one sitting. For Screaming Frog SEO Spider, crawl an owned site locally, inspect technical signals, and export raw audit data. The hard boundary is years of crawl edge cases, javascript rendering, integrations, and desktop performance, plus crawl scale, rule depth, and operational polish. Review the scope, implementation prompt and trade-offs in the Screaming Frog SEO Spider build guide.
