Free tier only
Free Alternatives to Seldon (2026)
Seldon starts at $3. Here are 6 Testing & QA tools you can start using for free, ranked by how closely they match Seldon, with what each charges once you outgrow the free plan.
Closest free matches
Ranked by shared use cases, audience and stack with Seldon. Every tool here lists a free plan.
BotGauge is an AI agent reliability platform that red-teams agents with adaptive attacks, traces every run, turns failures into evaluations and policies, and monitors agents in production; the company also runs an AI-led managed QA service.
TheySaid is a user-testing platform that runs usability tests with synthetic AI testers or real people and delivers findings and fix prompts inside tools like Claude Code, Cursor and Jira.
Ultracite is an open-source, zero-configuration preset for Biome, Oxlint and ESLint. It lints and formats JavaScript and TypeScript code and checks each edit an AI coding agent makes against a strict, shared set of rules.
Gologin runs isolated browser profiles, each with its own fingerprint, cookies and proxy, on desktop or in the cloud; its Cloud Browser gives Playwright, Puppeteer and AI agents persistent logged-in Chromium sessions over CDP.
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Other free Testing & QA tools
Popular free tools in the same category. Less closely matched to Seldon, but worth a look.
| Tool | Free plan | Paid from |
|---|---|---|
| ProofRank Check any website's speed, SEO, accessibility, security and AI crawler access, get a prioritized list of fixes, and see sites ranked by measured score. | Free: private analysis, Action Queue, 1 site · Pro: $19.99/mo · Spotlight: $59.99/mo | $19.99 |
| SonarQube SonarQube is Sonar's code quality and security analysis tool, offered as a free open source Community Build, paid self-managed Server editions priced by lines of code, and the hosted SonarQube Cloud. | Community Build - Free - open source, LGPL-3.0, self-managed · SonarQube Cloud Team - from $34/month - up to 100k LOC, 14-day trial (Free plan: private projects up to 50k LOC) · Server Developer / Enterprise / Data Center - per instance per year by LOC - contact sales | $34 |
Free alternatives to Seldon: FAQ
Quick answers to common questions
Is Seldon free?
No. Seldon lists no free tier; its lowest published price is $3. Each tool below offers a free plan.
What is the best free alternative to Seldon?
BotGauge is the closest free match by shared use cases, audience and stack. TheySaid, Ultracite and Gologin are the next closest.
Which free Testing & QA alternatives have paid upgrades?
ProofRank (from $19.99) and SonarQube (from $34) list paid plans above their free tier. 4 of the tools listed publish no paid price at all.
How were these free alternatives to Seldon chosen?
Tools are ranked by similarity to Seldon (shared use cases, target audience, tech stack and pricing model) and filtered to those whose listing shows a free tier, freemium plan or open-source edition. Where fewer than 2 close matches exist, popular free Testing & QA tools fill the list and are labelled as such.
Building a free Testing & QA tool?
List it free. Tools with a free tier appear on pages like this one.