RefriPro

What it does

HVAC technicians juggle a PT chart booklet, 2-3 separate reference apps, and handwritten reports on every service call. RefriPro puts all of it in one offline Android app. - PT chart calculator for 50+ refrigerants - Superheat/subcooling calculator with 6-state diagnosis — not just a number, but what it means - 754 error codes across 8 major brands (Carrier, Daikin, Trane, Lennox, Mitsubishi, LG, Fujitsu, Samsung) Everything runs locally. No internet required. Free on Google Play.

• 
  FieldCalc HVACJul 2026 · apps.apple.com · ▲8

  Offline HVAC calculator: R-454B PT, superheat, duct, load

• 
  HVAC Tools HubAug 2026 · hvactoolshub.com · ▲4

  Free HVAC calculators and practical reference tools

• 
  HVAC Admin Feb 2026 · hvacadmin.com · ▲2

  Free tools & knowledge hub for HVAC techs

• 
  HVAC LogicAug 2026 · hvaclogic.org · ▲2

  client-side HVAC & thermodynamic calculation suite

• 
  R-ProMay 2026 · r-pro.app · ▲2

  AI field app for HVAC techs. Offline. 10 languages.

• 
  FieldCalc ProMar 2026 · bytecovesoftware.com

  28 code-compliant calculators. 100% offline. No account.

• 
  /dev/null▲484

  a social network for devs

  Dev tools · 3d ago · dev-null.sh

• 
  Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

  open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

  Dev tools · 28d ago · github.com

• 
  Reladraw – A diagram language where you decide where to place things▲411

  Contribute to reladraw/reladraw development by creating an account on GitHub.

  Dev tools · 26d ago · github.com

• 
  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 23d ago · openbot.run

• 
  Talanoa▲346

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 20d ago · talanoa.email

• 
  CoreSpeed▲332

  One MCP for everything your agents need: apps, memory, tools

  Dev tools · 28d ago · corespeed.io

• 
  Lightfield▲901

  AI-native CRM that builds itself and does work for you

  AI · Mar 2026 · lightfield.app

• 
  Tobira.ai▲728

  A network where AI agents find deals for their humans

  AI · Mar 2026 · tobira.ai

• 
  Claude Import Memory▲716

  Switch from ChatGPT to Claude with import memory feature

  AI · Mar 2026 · claude.com

• 
  Littlebird▲709

  Littlebird remembers everything across your meetings, messages, docs, and apps, then takes action so you can recall any detail and never lose context.

  AI · Mar 2026 · littlebird.ai

• 
  Viktor.com▲702

  Your AI Coworker that proactively executes tasks

  AI · Mar 2026 · viktor.com

• 
  Jupid▲659

  File your taxes with Claude Code

  Commerce · Mar 2026 · jupid.com