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Show HN: Yesterday/Today app – experiment born from how work gets done

https://joeyguerra.com/yesterday-today.html
1•gijoeyguerra•1h ago
Hey HN,

I built a small experiment to test a hypothesis I've observed: when teams are under real pressure, managers revert to a document.

https://joeyguerra.com/yesterday-today.html

I've noticed this behavior in myself as well as other managers who are responsible for task execution and team coordination. When deadlines are tight, ambiguity is high, coordination is super important - managers and teams often abandon formal tools and just open a document to track and refine a list of todos.

Observation: Every day the manager shares their screen, showing Notepad or Google Docs, and just lists out what to do. As the days go by, this UX shows what moved yesterday/was accomplished and what must happen today.

In the process of "going through the list" tasks get refined, together as a team, in real time.

Progress is visible by the day, not by status or workflow stage (like Kanban, Jira, etc).

The hypothesis is that we default to documents because they make the "flow of work over time" visible. My belief is that progression beats abstract states.

The app is intentionally minimal. I'm trying to isolate why the document works before adding anything else.

I'd love feedback on: - Does this model match how you've seen teams operate under pressure? What's your experience? - What feels fundamentally right? wrong? - Where does this fall apart in a real team? - What would you immediately want to add or intentionally keep out? gut reaction.

I appreciate any pushback, critique, or "this reminds me of ..." reactions.

Thanks ya'll.

Show HN: I built a 3D web-based multiplayer game with Claude Code

https://arena.ibuildstuff.eu
1•tombuildsstuff•3m ago•0 comments

The origin of the names of the days of the week in Portuguese

https://www.practiceportuguese.com/learning-notes/days-of-the-week/
1•DamonHD•4m ago•0 comments

European troops arrive in Greenland to boost the Arctic island's security

https://www.npr.org/2026/01/15/g-s1-106113/european-troops-arrive-greenland
1•geox•4m ago•0 comments

Using Git to attribute AI-generated code

https://github.com/mesa-dot-dev/agentblame
3•remolacha•8m ago•1 comments

Proof of Concept to Test Humanoid Robots

https://thehumanoid.ai/humanoid-and-siemens-completed-a-proof-of-concept-to-test-humanoidrobots-i...
1•0xedb•10m ago•0 comments

OpenAI Partners with Cerebras

https://www.cerebras.ai/blog/openai-partners-with-cerebras-to-bring-high-speed-inference-to-the-m...
1•nezhar•11m ago•0 comments

Show HN: Turn GitHub Contributions Graph into Space Shooter Battle Field

https://github.com/czl9707/gh-space-shooter
1•zane__chen•14m ago•0 comments

Sony wiped over 1k shovelware games off the PlayStation store without warning

https://www.eurogamer.net/sony-wiped-over-1000-shovelware-games-off-the-playstation-store-without...
3•croes•16m ago•0 comments

Playing daily games at work? Timdle just launched work mode

https://www.timdle.com/work
2•maskinberg•16m ago•0 comments

Context Engineering for Personalization with OpenAI Agents SDK

https://cookbook.openai.com/examples/agents_sdk/context_personalization
1•gmays•17m ago•0 comments

When programs assume the system will never change, episode 4: Stealing strings

https://devblogs.microsoft.com/oldnewthing/20260115-00/?p=111988
1•zdw•18m ago•0 comments

I added partial (incomplete) row streaming to a query engine

https://blog.vega.io/posts/partial_stream/
1•tontinton•21m ago•0 comments

Al models were given four weeks of therapy: the results worried researchers

https://www.nature.com/articles/d41586-025-04112-2
1•simonebrunozzi•22m ago•0 comments

State and Federal Lawmakers Want Data Centers to Pay More for Energy

https://www.nytimes.com/2026/01/15/business/energy-environment/data-center-energy-electricity-cos...
1•donohoe•23m ago•0 comments

US suspends immigrant visa processing for 75 countries beginning January 21

https://travel.state.gov/content/travel/en/News/visas-news/immigrant-visa-processing-updates-for-...
1•mportela•24m ago•1 comments

Ask HN: Is Claude Code bad for ADHD?

1•chriswright1664•25m ago•1 comments

Show HN: TeletextSignals – Local RAG over 25 Years of Swiss Teletext News

https://github.com/r-follador/TeletextSignals
1•folli•26m ago•0 comments

TWC Security Party – Group education event for tech workers to improve their PR

https://us02web.zoom.us/meetings/83864945846/invitations?signature=4UIf8C8zlkKWDox7ZdErZvL2DhcwC8...
1•todsacerdoti•27m ago•0 comments

Using Tokio with CPU-Bound Tasks in Rust (2022)

https://www.influxdata.com/blog/using-rustlangs-async-tokio-runtime-for-cpu-bound-tasks/
1•Abbit•30m ago•0 comments

Pg-safeupdate: A PostgreSQL extension requiring criteria for UPDATE and DELETE

https://github.com/eradman/pg-safeupdate
1•tanelpoder•30m ago•1 comments

Situation Watch

https://www.situation.watch/
1•brodouevencode•32m ago•0 comments

Interaction System for Treadmill Video Games Using a Smartphone Camera

https://www.mdpi.com/1424-8220/26/1/20
1•PaulHoule•35m ago•0 comments

Trump Officials Vow to Keep All US Coal Plants Running

https://www.bloomberg.com/news/articles/2026-01-15/trump-officials-vow-to-keep-all-us-coal-plants...
3•toomuchtodo•35m ago•1 comments

StackWarp: Exploiting Stack Layout Vulnerabilities in Modern Processors

https://roots.ec/blog/stackwarp
1•matt_d•35m ago•0 comments

Open Source Strategies

https://tempestphp.com/blog/open-source-strategies
1•7777777phil•36m ago•0 comments

Microsoft may soon allow IT admins to uninstall Copilot

https://www.bleepingcomputer.com/news/microsoft/microsoft-may-soon-allow-it-admins-to-uninstall-c...
1•janandonly•36m ago•0 comments

Database Transactions

https://planetscale.com/blog/database-transactions
2•ksec•37m ago•0 comments

At the Turning of the Tide: How to Fight Our Way Out of the Trump Era

https://crimethinc.com/2025/12/16/at-the-turning-of-the-tide-how-fight-our-way-out-of-the-trump-era
4•angoragoats•37m ago•0 comments

Sign of the times: Amazon is making a fallout shelter reality TV show

https://www.engadget.com/entertainment/tv-movies/amazon-is-making-a-fallout-shelter-competition-r...
2•dreadsword•37m ago•0 comments

Hyperfocus vs. Perspective as a Staff Engineer (2023)

https://softwaredoug.com/blog/2023/06/15/hyperfocus-vs-perspective
2•softwaredoug•37m ago•0 comments