fernsignal
Small tools. Clearer decisions.

A little less guessing.
A lot more signal.

Research your next Amazon product. Find what needs fixing on your website. Two focused tools that show their working.

Free tools first. No card needed to start.

Two desks.
Different jobs.

Open a tool and do something useful before you decide whether to pay.

01 / AMAZON SELLER RESEARCH

Seller Desk

Bring product observations together. Compare a niche, inspect price and rank history, and see whether the numbers work.

  • Product database, filters and saved shortlists
  • Keepa search with your own API subscription
  • Margin, keyword, listing and inventory tools
Meet Seller Desk ↗
02 / WEBSITE HEALTH

Site Audit

Get a repair list with the exact page, response and link behind each finding. Keep your next website cleanup focused.

  • Broken internal links and server responses
  • Titles, descriptions, headings and image alt text
  • Saved reports and weekly website monitoring
Meet Site Audit ↗
How we work
01

Start with evidence.

Use an actual report, a timestamped observation or a response from your website.

02

See the calculation.

Inputs and assumptions stay visible. Missing information stays unknown.

03

Take your work with you.

Export your research and reports. Keep a backup in formats you can use elsewhere.

A plan for each job.

Try free tools first. Each subscription renews monthly until cancelled. Provider data subscriptions are separate.

Seller Desk Pro
£19 / month

For sellers who want their research saved across devices.

  • Cloud research workspace and backups
  • Product comparisons and snapshot history
  • Keyword, sourcing and financial workflows

Keepa data requires your own separately paid API key.

Site Audit Pro
£15 / month

For people who look after websites.

  • Up to 250 pages per scan and 80 scans per month
  • Five websites monitored weekly
  • Saved reports, CSV export and print reports

Free scans cover up to 25 pages on one hostname.