Numi
Calculator and converter application
Install with Homebrew
brew install --cask numi
Numi — Official Website
Quick Take: Numi
Numi remains the nicest lightweight math notepad on the Mac in August 2026: free to try, plain-language calculations, variables, and unit/currency smarts without spreadsheet ceremony. Pay once if you need unlimited notes and iCloud sync; otherwise the free app may be enough. Soulver is the premium rival; Spotlight is the zero-cost rival. For freelancers and developers who think in sentences not cells, Numi still deserves the global hotkey.
Best For
- •Freelancers writing readable project estimates
- •Developers doing unit/data/color conversions
- •Travelers mixing currencies and time zones
- •Anyone who hates calculator button grids
What is Numi?
Numi is a beautiful text-based calculator for Mac (also Windows and Linux) that lets you mix plain language, units, currencies, and variables in a notepad-style document. Instead of a button grid you type 15 hours * $75/hour + 10% tax or 200 EUR in USD and results appear on the right side of each line. The mental model matches how people actually estimate on paper: write the story and the math together. Lines without math stay as notes or headings, so a project quote becomes a readable sheet rather than a cryptic expression list. Variables (hourlyRate = 85) cascade through the document; change one value and dependent lines update. Unit conversions span length, weight, temperature, data sizes, time, and more. Live currency conversion and time zone helpers cover freelancers and remote teams. As of August 2026 Numi remains actively available from numi.app with a free Mac download (DMG), Windows installer, and Linux builds, plus docs and source presence on GitHub (nikolaeu/numi). The free app is usable for everyday single-document calculations. The paid license unlocks unlimited notes and iCloud sync (also sold via Setapp). Historical storefronts have listed the unlock around the $20-$30 one-time range; confirm the live Paddle checkout on numi.app/buy because the price is not always printed as plain text on the marketing page. On Apple Silicon Macs Numi is a light native-feeling utility that lives well beside Raycast or Alfred for quick math. Global shortcuts and Alfred workflows let you calculate without keeping the window frontmost. Competitors include Soulver (premium Mac math notes), NoteCalc / Notes Calculator style tools, and plain Spotlight/bc for one-liners. Numi wins on aesthetics and natural language; Soulver wins on deeper macOS polish for some power users; Spotlight wins when you need one conversion and zero apps. If you invoice in mixed currencies, convert CSS colors, or keep living estimate documents, Numi still earns a Dock slot in 2026. It is not a spreadsheet and not a CAS algebra system. It is the best middle ground between a calculator and a scratchpad. Practical setup on Mac in 2026 is still simple: download the DMG from numi.app, drag Numi to Applications, grant any accessibility permissions if you use global shortcuts, and optionally bind a hotkey that does not collide with Raycast or Alfred. Keep a living quotes.md-style document for each client so rate changes propagate through variables. When you need multi-device access, unlock iCloud sync; when you only need airport Wi-Fi currency math, the free single-document mode is enough.
Closer look: Text-Based Calculators and Why They Work
Numi succeeded by matching how people already write estimates: sentences with numbers embedded, not isolated keypad punches. That design keeps the app small, fast, and pleasant on MacBook keyboards. In a market full of AI chat calculators, Numi's offline-first notepad approach still feels faster for deterministic arithmetic you must show a client.
History & Background
The idea of typing math as text rather than clicking calculator buttons has been around since command-line tools like bc and dc in Unix (1975). But those tools required strict syntax. Numi, launched in 2015 by Dmitry Nikolaev, brought natural language parsing to the concept: you type '20% of $150' instead of '150 * 0.2.' Soulver (2005) pioneered the category with a similar approach. What both tools recognized is that people think about math in words and sentences, not in calculator syntax. The text-based calculator category remains small but has loyal users who find the approach fundamentally better for everyday math.
How It Works
Numi uses a custom parser that tokenizes each line of text, identifies mathematical expressions, operators, units, and currencies, and evaluates them. Non-mathematical text is ignored (treated as comments). Variables are stored in a symbol table that's shared across the document. The parser handles ambiguity through precedence rules, '5 feet in meters' is recognized as a unit conversion, not '5 feet' times 'in' times 'meters.' Currency rates are fetched from external APIs on launch and cached. The macOS app is built natively with Swift, while the CLI version is a separate implementation.
Ecosystem & Integrations
Numi's ecosystem includes the macOS desktop app (primary), a CLI version (numi-cli) for terminal and scripting use, and an Alfred workflow for launcher integration. The open-source repository on GitHub accepts community contributions. Users have added units, fixed parsing edge cases, and improved localization. The CLI version is useful for automation: pipe calculations through numi-cli in shell scripts or CI pipelines. Soulver, the main competitor, has a broader ecosystem with iOS apps, Shortcuts integration, and more structured document features.
Future Development
Numi remains a mature, independently developed calculator with a steady but calm release cadence. The CLI and cross-platform Electron builds continued to receive maintenance updates into 2026, while the Mac app stays the flagship experience. Likely near-term improvements users still ask for include richer multi-line expression editing, tighter macOS Shortcuts support, more resilient currency rate sources when offline, and ongoing dark mode refinements. The product thesis is stable: a text-first calculator that reads like a note does not need annual reinvention. As long as freelancers keep quoting projects in mixed units and currencies, Numi has a clear niche beside Soulver and spreadsheet tools.
Key Features
Natural Language Math
Type `20% of $150`, `half of 248`, or `5 miles in km`. The parser finds expressions inside ordinary text without spreadsheet formula syntax.
Unit Conversions
Length, weight, volume, temperature, data storage, time, speed, and area conversions inline: ideal for engineering notes and everyday measurements.
Live Currency Conversion
Convert and combine currencies with updating rates (`150 EUR + 200 GBP in USD`) for freelancers and travel budgets.
Variables and References
Define `hourlyRate = 85` and reuse it across lines so estimate documents recalculate when rates change.
Time Zone Helpers
Expressions like `now in Tokyo` or `3pm EST in PST` keep remote scheduling math next to the rest of your notes.
Mixed Text and Math
Non-math lines are comments/headings, turning a calculation into a client-readable document.
Global Shortcut and Alfred
Summon Numi from anywhere or pipe quick calculations through Alfred without breaking flow.
CSS Color Conversions
Convert hex/RGB style color values for front-end work without opening a separate color tool.
Cross-Platform Continuity
Mac remains the flagship, with Windows and Linux builds for mixed fleets; paid unlock emphasizes unlimited notes and iCloud sync on Apple devices.
Who Should Use Numi?
1Freelancer Estimating Projects
A freelance designer needs to quote a multi-phase project for an international client. In Numi, they type: 'Research: 8 hours * $85/hour,' 'Design: 20 hours * $85/hour,' 'Revisions: 10 hours * $85/hour,' then 'Subtotal: research + design + revisions' followed by 'Total in EUR: subtotal in EUR.' The quote is a readable document with clear line items. When the client asks for a 10% discount, the designer adds 'Discount: 10% of subtotal' and 'Final: subtotal - discount in EUR.' Done in 30 seconds.
2Developer Doing Quick Conversions
A developer is debugging a file upload issue. The API returns a 413 error for files over a certain size. They open Numi and type: 'maxSize = 10 MB in bytes' to get the byte limit, '15.5 MB in bytes' to check the failing file size, and '15.5 MB - 10 MB' to see how much over the limit the file is. The entire investigation happens in a text editor, not a browser.
3Remote Team Coordinator
A project manager coordinates a team across San Francisco, London, and Tokyo. They need to find a meeting time that works for everyone. In Numi: '10am PST in London' shows 6pm GMT, '10am PST in Tokyo' shows 3am JST (too late). They try '8am PST in Tokyo', 1am JST (still bad). '5pm London in Tokyo', 2am JST. They see there's no perfect time and decide on async updates for Tokyo.
How to Install Numi on Mac
Numi is available through Homebrew and the Mac App Store.
Install via Homebrew
Run brew install --cask numi. The app installs to your Applications folder.
Launch Numi
Open Numi from Applications or Spotlight. You'll see a clean text area. Start typing calculations immediately.
Set Up Global Shortcut
Go to Numi > Preferences > General and configure a global keyboard shortcut (e.g., Option+Space). This lets you summon Numi from any app for quick calculations.
Optional: Alfred Workflow
If you use Alfred, install the Numi Alfred workflow from the Numi website. This lets you run calculations directly from Alfred without opening Numi's window.
Pro Tips
- • Start by typing a simple calculation: '15% of 230' or '100 USD in EUR.' See how the result appears on the right side of the line.
- • Use blank lines and text-only lines as section headers. Numi ignores non-math lines, so you can organize calculations with headings.
- • Define variables at the top of your document for values you reference multiple times: 'rate = 85' then use 'rate' anywhere below.
Configuration Tips
Create Template Documents
If you regularly make the same type of calculation (weekly invoicing, travel budgets, project estimates), create a template document with your standard variables and structure. Duplicate it for each new calculation. The template keeps your format consistent and saves setup time.
Use Numi as a Unit Conversion Scratchpad
Keep Numi running and use the global shortcut whenever you need a quick conversion. '72°F in C' during a weather discussion. '2.5 liters in cups' while cooking. '500 GB in TB' while shopping for drives. The shortcut makes Numi faster than opening Google for conversions.
Alternatives to Numi
Calculator and math-note apps people compare with Numi:
Soulver
Premium Mac-native math notes with excellent typography and deeper macOS integration. Usually costs more; choose Soulver for maximum polish, Numi for lighter free-to-start workflows.
Notes Calculator / NoteCalc-style tools
Web or cross-platform note calculators with generous free tiers. Often less Mac-native UI than Numi.
Soulver 3 for iOS + Mac
If you need continuum across iPhone and Mac with one vendor, evaluate Soulver's suite versus Numi's iCloud unlock.
Spotlight and built-in Calculator
Zero install for one-off arithmetic. No multi-line documents or variables.
Calca
Markdown-flavored reactive documents. Powerful but less actively marketed than Numi/Soulver in 2026.
Pricing
Numi offers a free download for Mac, Windows, and Linux that covers everyday single-document calculations. A paid license (sold via Paddle on numi.app/buy) unlocks unlimited notes and iCloud sync; Numi is also available through Setapp. Public third-party listings have commonly referenced roughly $20-$30 one-time pricing for the unlock, verify the live checkout amount before purchase. No subscription is required for the core paid license model.
Pros
- ✓Natural language math is faster than button calculators for real estimates
- ✓Variables turn a note into a living quote sheet
- ✓Currency and unit conversions live beside your commentary
- ✓Lightweight Mac utility with global shortcut / Alfred hooks
- ✓Free tier is usable; paid unlock is one-time rather than SaaS
- ✓Cross-platform builds help mixed device users
Cons
- ✗Not a full spreadsheet: large tabular models belong in Numbers/Excel
- ✗Currency rates depend on network updates; offline precision can lag
- ✗Paid unlock price is easy to miss on the marketing site; checkout reveals it
- ✗Smaller community and plugin ecosystem than mainstream productivity suites
- ✗Windows/Linux builds are Electron-class ports compared with the Mac original feel
Community & Support
Numi is an open-source project created by Dmitry Nikolaev, hosted on GitHub with 6,300+ stars and 247+ forks. The repository accepts community contributions, users have contributed localization, additional unit support, and bug fixes. Discussion happens on GitHub Issues, Reddit (r/macapps), and the broader macOS productivity community. The CLI version (numi-cli) is maintained separately and supports scripting and automation workflows. An Alfred workflow is maintained for launcher integration.
Video Tutorials
Getting Started with Numi
More Tutorials
Numi | The Smartest Calculator for Mac?
David Kayode • 450 views
12 Mac Apps I Regret Not Installing Sooner
Marwane Tane • 6.2K views
Numi - Type Text to Help Calculating Numbers on Mac (1/2)
aMacxd • 889 views
Frequently Asked Questions about Numi
About the Author
Productivity & Workflow Analyst
Expert Tips for Numi
Power users keep Numi bound to a global hotkey and treat it as a scratch buffer during client calls, the document format is the feature, not the arithmetic engine.
The paid unlock's value is unlimited notes + iCloud, not 'more math functions', buy only if multi-doc sync matters.
Related Technologies & Concepts
Related Topics
Sources & References
Fact-CheckedLast verified: Feb 23, 2026
Key Verified Facts
- Numi is available as a free Mac download from numi.app with Windows and Linux builds linked from the site.[cite-1]
- The paid license activates unlimited notes and iCloud sync via numi.app/buy (Paddle).[cite-2]
- Numi source and docs are published under the nikolaeu/numi GitHub project.[cite-3]
- Numi is also distributed through Setapp.[cite-4]
- 1Numi - Beautiful calculator
Accessed Aug 9, 2026
"Official site with Mac DMG download and Windows/Linux links."
- 2Buy Numi License
Accessed Aug 9, 2026
"Paid unlock for unlimited notes and iCloud sync; Paddle checkout."
- 3nikolaeu/numi on GitHub
Accessed Aug 9, 2026
"Open GitHub project documenting Numi as a natural language calculator."
- 4
- 5
- 6Best Numi alternatives 2026
Accessed Aug 9, 2026
"Notes Numi's single-note free tier and one-time paid license model."
Research queries: Numi calculator Mac features pricing