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Different tools for the things you do every day. Explore NO., Kerstara and StuffDNA, and find the app that fits your next task.

NO. – Call Them Out app icon

NO. – Call Them Out

Understand it before you pay.

A second opinion for the bills, fees and fine print that deserve a closer look. Upload a bill, invoice, price-increase notice, subscription, contract or warranty, and NO. helps explain what it says and what to question next.

  • Standard analysis gives you a focused verdict and a practical next move.
  • Premium adds deeper explanations, savings math when the document supports it, and wording for your response.
  • Prepare a message or call script, with fallback steps to help you follow through.

AI explanations are informational. Check the original document; savings or dispute outcomes are not guaranteed.

Kerstara Client Studio app icon

Kerstara Client Studio

Your clients. Your schedule. One clear workspace.

A workspace for independent professionals who want the details around every client relationship within reach. Bring client profiles, appointments, session context, services and follow-ups together, so the next step is easier to see.

  • Keep contact details, preferences, notes, history and relationship context organized by client.
  • Plan appointments and follow-ups while keeping everyday business information close.
  • Use optional AI-assisted drafts with selected context, and review every draft before using it.

Core client management is free. Optional Plus+ and Pro subscriptions are available in the iPhone app. App Store availability varies by region.

StuffDNA app icon

StuffDNA

Know your stuff. Find the parts. Fix it smarter.

Give the tools, equipment, appliances and workshop gear you own a useful record. StuffDNA brings equipment identity, maintenance history, repair notes and important documents together, with AI-assisted guidance when something needs attention.

  • Record make, model, serial number, condition, photos and ownership details.
  • Keep service dates, repair jobs, parts, costs, receipts and warranties alongside the right item.
  • Explore possible causes and components to inspect, plus Tool Protection records and used-tool serial checks.

Verify exact parts and fitment with the manufacturer. Visit the availability page for the latest iPhone release information.