Free Online Developer & Finance Tools
Calculators, formatters and converters that run entirely in your browser.
10 pages →Developer Guides & Troubleshooting
Plain-English fixes for the errors that stop a build, and the concepts behind them.
12 pages →Business Software Buying Guides
Vendor comparisons for backup, security, compliance, payroll and finance software.
8 pages →Recently updated
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Fixing 'Cannot find module' in Node
Which resolver ran, what it searched, and the extension, case and exports cases behind most failures.
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Resolving a Git merge conflict properly
Read the markers, work out which side is ours, and prove the resolution kept work from both branches.
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Best cloud backup for business
Immutability, restore testing and the Microsoft 365 data gap, with six platforms compared by operational fit.
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How to undo a Git commit
Choose reset, revert, amend or rebase, and use the reflog when a history rewrite goes wrong.
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Best tax software for freelancers
Self-employment tax, quarterly estimates and the practical differences between Schedule C filing options.
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How to fix CORS errors
Match the browser error to a missing header, failed preflight, origin mismatch or credential conflict.
Free Tools
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SaaS Seat Cost Calculator
Project per-seat software costs as headcount and prices change, then compare monthly and annual billing over one to ten years.
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Cloud Cost Calculator
Compare estimated monthly AWS, Azure and Google Cloud costs for compute, storage, outbound transfer, managed databases and load balancing.
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Cron Expression Generator
Build or parse a standard five-field cron expression, read its schedule and calculate the next ten runs in local time.
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Mortgage Payoff Calculator
Estimate how extra monthly, annual or lump-sum principal payments change mortgage interest and payoff time.
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Color Contrast Checker
Check a foreground and background color against WCAG 2.2 AA and AAA contrast thresholds, with a preview and an adjusted foreground option.
Developer Guides
View all →-
Fixing 'Cannot find module' in Node
Which resolver ran, what it searched, and the extension, case and exports cases behind most failures.
-
Resolving a Git merge conflict properly
Read the markers, work out which side is ours, and prove the resolution kept work from both branches.
-
How to undo a Git commit
Choose reset, revert, amend or rebase, and use the reflog when a history rewrite goes wrong.
-
How to fix CORS errors
Match the browser error to a missing header, failed preflight, origin mismatch or credential conflict.
-
Why your React useState is not updating
Check captured values, state mutation, batching and effect dependencies when a state update seems to disappear.
Business Software
View all →-
Best cloud backup for business
Immutability, restore testing and the Microsoft 365 data gap, with six platforms compared by operational fit.
-
Best tax software for freelancers
Self-employment tax, quarterly estimates and the practical differences between Schedule C filing options.
-
Best endpoint security software for business
EDR, XDR and MDR compared, with guidance on reading MITRE ATT&CK results and staffing the alerts they produce.
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SOC 2 compliance software
What automation covers, the full cost including the auditor, and the practical differences among Vanta, Drata and Sprinto.
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GDPR compliance software
CMPs, data mapping and DSAR tooling, with practical buying thresholds at 10, 100 and 1,000 employees.
JunePoint also builds software
Jackson Abeyta writes this publication through JunePoint, a cross-platform software studio. JunePoint also builds web and mobile applications, and its studio portfolio carries no advertising.
Visit JunePoint Studio