Sigma Notepad Calculator

What it does

Type math in plain English on iPhone. Write a line, results appear live in a second column. Edit anything, everything updates. Currencies, unit conversions, variables, aggregates, dates, math functions, hex. All inline, all editable. Free with three sheets. Pro unlocks unlimited sheets, iCloud sync, and export to PDF, Markdown, or plain text.

Type math in plain English on iPhone. Variables, currencies, and units. Results appear instantly.

Do everyday math by just typing it out. Sigma reads plain English and answers as you go. Name your numbers and reference them anywhere. No buttons, no modes. Just a notepad that calculates. Capabilities What it does. Plain English Type it like a sentence. Percentages, functions, and everyday phrasing. Sigma reads what you mean and answers in the margin, instantly. Variables Name once, reuse anywhere. Declare a value, then reference it by name across the sheet. Change it once and everything downstream updates. Currencies & units Convert as you type. Live exchange rates and unit conversions, inline. Mix currencies in one sum and Sigma keeps the math straight. Dates Date math that just works.…from getsigma.app

• 
  iPad Calculator2024 · apple.com · ▲188

  Revolutionizing calculations on iPad – smarter, faster, best

• 
  I made a web-based notepad with a built in unit calculator2022 · numpad.io · ▲488

  I launched NumPad v1 on here a few years ago, and back then it wasn't much more than a thin CodeMirror wrapper around the calculator engine I'd written. Now I've rewritten it as a PWA that supports multiple documents, persists them to IndexedDB, and has a syncing service for paying customers. Syncing is handled by Automerge[1] under the hood, which should make it relatively easy to get document sharing working too. [1] https://automerge.org/

• 
  Calculator Notepad2022 · chromewebstore.google.com · ▲75

  A free-form calculator for Chrome

• 
  iCalculatorX2021 · apps.apple.com · ▲70

  All-in-one calculator for iPad and iPhone

• 
  CalcMate2023 · accounts.google.com · ▲88

  calculate numbers, dates, units within notes

• 
  TCal2022 · apps.apple.com · ▲58

  Notepad calculator app

• 
  zCAD AI▲321

  AI 3D that creates real parts, not just shapes

  Work · 12d ago · zcad.ai

• 
  Smooth Recorder▲257

  Mac screen recordings that look edited when you hit stop

  Work · 24d ago · smoothrecorder.com

• 
  Badgey▲226

  Your iPhone becomes a name badge that faces the room

  Work · 19d ago · apps.marcoluthi.com

• 
  Figma Specs▲225

  A container for your context that lives on the Figma canvas

  Work · 9d ago · figma.com

• 
  The rarest tech books and docs you've probably never read▲190

  Work · 18d ago · readrare.com

• 
  Orbit▲176

  Stop doomscrolling. Earn every app unlock.

  Work · 13d ago · apps.apple.com

• 
  Brew ▲900

  Like Claude design for email marketing

  AI · May 2026 · brew.new

• 
  Kilo Code for VS Code▲896

  Parallel agents, diff reviewer, and multi-model comparisons

  Dev tools · May 2026 · kilo.ai

• 
  StoreClaw▲806

  Grow your store profits with agents that know how to sell

  AI · May 2026 · storeclaw.ai

• 
  PollyReach▲795

  Give your agent a real number and voice to make calls.

  AI · May 2026 · pollyreach.ai

• 
  Needle: We Distilled Gemini Tool Calling into a 26M Model▲776

  Hey HN, Henry here from Cactus. We open-sourced Needle, a 26M parameter function-calling (tool use) model. It runs at 6000 tok/s prefill and 1200 tok/s decode on consumer devices. We were always frustrated by the little effort made towards building agentic models that run on budget phones, so we conducted investigations that led to an observation: agentic experiences are built upon tool calling, and massive models are overkill for it. Tool calling is fundamentally retrieval-and-assembly (match query to tool name, extract argument values, emit JSON), not reasoning. Cross-attention…

  Life & fun · May 2026 · github.com

• 
  Files.md – Open-source alternative to Obsidian▲730

  🌱 Private, quiet space for thinking. Simple app for .md files. - zakirullin/files.md

  Dev tools · May 2026 · github.com