Hi everyone,
I have been working on two free, open-source extensions for Manager.io and would love the community to test them and share honest feedback.
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① Manager.io Developer Toolkit
Try it: https://ksl1816.github.io/manager-developer-toolkit-extenstion/
Code: https://github.com/ksl1816/manager-developer-toolkit-extenstion
This tool is for anyone who wants to build their own Manager.io extension but does not know where to start with the API or coding.
How it works:
-> Load any Manager.io endpoint (customers, invoices, inventory, reports…)
→ The toolkit inspects the live data and shows you every available field
→ Select the fields you want, describe what you want to build
→ Click Generate — it produces a complete, ready-to-paste AI prompt
→ Paste into Anthropic Claude, OpenAI ChatGPT, or Google Gemini
→ Get back a fully working extension HTML file
→ Install it in Manager.io or host it free on GitHub Pages in minutes
No coding knowledge required for basic use. Developers will get even more out of it.
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② Sales Analytics Dashboard
Try it: https://ksl1816.github.io/manager-io-sales-analytics-dashboard/
Code: https://github.com/ksl1816/manager-io-sales-analytics-dashboard
This extension was built entirely using the Developer Toolkit above — I loaded the sales invoice endpoint, selected the fields, generated the prompt, pasted it into an AI, and deployed the result.
It is a real example of what the toolkit produces.
What you get:
-> Day-by-day sales breakdown for any month
→ Best and worst day highlighted automatically
→ Month-to-month comparison with charts and difference table
→ KPI cards — grand total, averages, best month, active days
→ Automatic trend insights — upward, declining, or volatile
→ Filters by year, month, or custom date range
→ Works for any country — no hardcoded currency
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Important Note
These extensions work only inside the Manager.io environment using the built-in Extensions feature. They are not standalone apps.
How to add an extension in Manager.io:
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Open Settings
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Click Extensions
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Click New Extension
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Enter a Name
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Set Source = URL
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Paste the extension link into Endpoint
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Choose a Placement (example:
/) -
Click Create
This matches the setup shown in the screenshots as below
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Both extensions are:
-> Free and open-source
→ Read-only — they never write, edit, or delete your data
→ Self-contained single HTML files — nothing to install
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I would really appreciate if you could:
-– Install and test either extension in your Manager.io
— Share what worked well or what did not
— Suggest features you would find useful
— Report any bugs or issues
All feedback is welcome, good or bad. Thank you for your time! 
