every developer using Claude Code and Codex has the same problem.

Claude builds something. you switch to Codex. Codex has no idea what just happened.

so you re-explain everything. manually. every time.

one product just killed that workflow 👇 https://x.com/socialwithaayan/status/2074845275706003488

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If you want to become good at system design (in 2026), learn these 26 case studies:

Intuit shut down Mint on March 23, 2024.

Millions of Americans woke up that morning with no budgeting app and no transaction history. Credit Karma got their accounts. It did not get the budgets, the categories, or the bill reminders.

Then the paid apps started ringing the register.

YNAB. $109 a year. Went from $50 to $84 to $99 to $109 in a decade.
Monarch Money. $99.99 a year base, $199 for forecasting.
Copilot Money. $95 a year. iOS and Mac only.
Rocket Money. $12 a month to actually cancel your subscriptions.

An app that shows you where your money went is now $100 a year for the rest of your life.

There is another way. It has been sitting on GitHub since 2014.

Firefly III. Not a budgeting app that tells you what you cannot buy. A double-entry bookkeeping system that shows you exactly where every dollar goes. Written by a maintainer in the Netherlands named James Cole who has committed 20,767 times to it. Latest commit today.

The principle it runs on is one line, straight from the docs. "If you know where your money is going, you can stop it from going there." Not stop spending. Not cut your lattes. Know where it goes. Then decide.

Every transaction has a source and a destination. Money does not vanish into a category, it moves between accounts. When you close the month the books balance because they have to.

Multiple accounts, multiple currencies, budgets with rollover, recurring bills with forecasting, tags, categories, piggy banks. Imports CSV, OFX, MT940 from any bank. Full REST API. A companion importer that connects through Nordigen and SimpleFIN.

Nothing leaves your server. Your data lives in your database on your machine.

23,948 stars. AGPL-3.0. Free forever. No premium tier. No cloud version selling your data on the side.

YNAB at $109 a year for five years is $545. Firefly III on a $5 a month Hetzner box for five years is $300, and that box is also running your photos, your notes, and your VPN.

Intuit shut Mint down. Somebody in the Netherlands has been quietly building the replacement for twelve years.

(Link in the comments)

Open-source and free apps for coders and makers

https://text-effects.colorion.co/ - CSS Text effects with AI prompts
https://sespulse.dev/ - Open-source self-hosted dashboard for Amazon SES
https://apifinder.io/ - Free directory of public APIs
https://www.tirreno.com/ - Open-source security framework
https://opentui.com/ - UI library for building terminal user interfaces

Stream up to 175 MByte/s from RP2350 using HDMI capture

https://github.com/steve-m/hsdaoh-rp2350 https://x.com/tom_doerr/status/2075064528874754491