tools
Microapp offers premium utility tools for humans and AI agents, accessible at microapp.io and through this MCP endpoint.
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What it can do
- Percentage Calculator: Calculate percentages three ways: what's X% of Y, what % is X of Y, and what's the % change from X to Y. Use mode='of' for the first form, mode='ratio' for the second, mode='cha
- Tip Calculator: Compute the tip, total, and per-person split for a bill. All amounts use the same (unspecified) currency — the engine doesn't care about currency codes.
- Discount Calculator: Apply a percentage discount to a price. Returns sale price, amount saved, and the discount percentage echoed back.
What data it sees
Do you need an account
No: the server works without sign-in
Microapp offers premium utility tools for humans and AI agents, accessible at microapp.io and through this MCP endpoint.
How to connect
How to connect tools to Claude
The server address to paste into Claude settings:
https://tools--microapp.run.tools
- Open Claude (claude.ai or the desktop app).
- Go to Settings → Connectors.
- Click Add custom connector.
- Paste the server address copied below into Remote MCP server URL and click Add.
- In a chat, click + → Connectors and switch the new connector on.
Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.
Authorization
After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.
How to connect tools to ChatGPT
The server address to paste into ChatGPT settings:
https://tools--microapp.run.tools
- Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
- Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
- Open Settings → Connectors and click Create.
- Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
- Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
- In a new chat open + → Apps/Connectors and enable the connector.
OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.
Authorization
On first use ChatGPT opens the service's sign-in window. Sign in and approve access.
How to connect tools to Cursor
The server address to paste into Cursor settings:
https://tools--microapp.run.tools
Fastest: click Open in Cursor below and confirm the prompt.
Manually:
- In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
- Paste the JSON copied below into
~/.cursor/mcp.json(per project:.cursor/mcp.jsonin the repo root). - Save the file. The server appears in the MCP list; authorize it there if asked.
Authorization
If the service needs sign-in, an authorize button appears next to the server in the MCP list.
Server tool list (46)
Raw names from tools/list. Only developers need these.
| percentage-calculator | Calculate percentages three ways: what's X% of Y, what % is X of Y, and what's the % change from X to Y. Use mode='of' for the first form, mode='ratio' for the second, mode='change' for the third. |
| tip-calculator | Compute the tip, total, and per-person split for a bill. All amounts use the same (unspecified) currency — the engine doesn't care about currency codes. |
| discount-calculator | Apply a percentage discount to a price. Returns sale price, amount saved, and the discount percentage echoed back. |
| aspect-ratio | Compute the simplified aspect ratio of a width × height pair, plus the decimal ratio. Useful for image, video, screen, and design contexts. |
| days-between | Calculate the number of days between two ISO 8601 dates. Returns days, weeks, months, and years (decimal). Inclusive count = absolute |end - start|. |
| average-calculator | Compute summary statistics for a list of numbers: count, sum, mean, median, min, max, and mode(s). |
| square-root-calculator | Compute square root, cube root, square, and cube of a number. Returns all four so callers don't have to call four tools. |
| prime-checker | Test whether an integer ≥ 2 is prime. Returns the verdict plus the prime factorization (useful for composite numbers). |
| fraction-simplifier | Simplify a fraction to lowest terms. Returns the simplified numerator/denominator, the decimal value, the gcd used, and the equivalent percentage. |
| rem-to-px | Convert REM (relative to root font size) to pixels. Defaults to a 16px base (browser default); pass base_px to use a different root size. |
| salary-to-hourly | Convert an annual salary to hourly, daily, weekly, and monthly equivalents. Defaults to a standard 40-hour, 52-week schedule. |
| geometric-mean | Compute the geometric mean (n-th root of the product) of a list of positive numbers. Also returns the arithmetic mean for comparison. |
| scientific-notation | Convert a number to scientific and engineering notation. Returns the coefficient, exponent, and several human-readable forms. |
| temperature-converter | Convert between Celsius, Fahrenheit, and Kelvin. Pass value + from + to. |
| length-converter | Convert between common length units: millimeter, centimeter, meter, kilometer, inch, foot, yard, mile. |
| weight-converter | Convert between common weight units: milligram, gram, kilogram, ounce, pound, stone, ton. |
| speed-converter | Convert between speed units: km/h, m/s, mph, knots, ft/s. |
| area-converter | Convert between area units: square-meter, square-kilometer, square-foot, square-yard, acre, hectare, square-mile. |
| volume-converter | Convert between volume units: liter, milliliter, cubic-meter, gallon-us, quart-us, pint-us, fluid-ounce-us, cup-us. |
| pressure-converter | Convert between pressure units: pascal, kilopascal, bar, psi, atmosphere, mmhg. |
| data-storage-converter | Convert between digital storage units: bit, byte, kilobyte (1024 B), megabyte, gigabyte, terabyte. Uses binary (1024-based) sizing. |
| energy-converter | Convert between energy units: joule, kilojoule, calorie (thermochemical), kilocalorie, watt-hour, btu. |
| angle-converter | Convert between angle units: degree, radian, gradian, turn. |
| hex-to-rgb | Convert a hex color (e.g. #ff8800) to RGB and RGBA channel values. Accepts 3-, 4-, 6-, and 8-digit hex with or without the leading #. |
| base64 | Encode plain text to base64 or decode base64 back to text. Use mode='encode' for plain→base64, mode='decode' for base64→plain. UTF-8 safe. |
| url-encoder | URL-encode or URL-decode a string. Uses RFC 3986 component encoding (encodeURIComponent semantics). |
| sha256-generator | Compute the SHA-256 hash of a text string. Returns the digest as a 64-character lowercase hex string. UTF-8 encoded. |
| uuid-generator | Generate one or more RFC 4122 v4 UUIDs (random). Returns an array of strings, even for a single UUID, so callers don't have to special-case length. |
| password-generator | Generate cryptographically random passwords. Caller controls length and character classes (uppercase / lowercase / numbers / symbols). Uses crypto.getRandomValues — strong enough for real passwords. |
| random-number | Generate one or more random numbers in [min, max]. By default returns integers; pass integer=false for floats. Uses Math.random() (not crypto-strong). |
| json-formatter | Format JSON: pretty-print with indentation or minify to a single line. Validates the input — invalid JSON returns a clear error pointing at the problem. |
| jwt-decoder | Decode a JWT into its header and payload. Does NOT verify the signature — use this for inspection only, never to trust the token's claims. |
| url-parser | Parse a URL into its components: protocol, host, port, path, query parameters, hash. Returns the query string parsed into a key-value map. |
| regex-tester | Test a JavaScript regex against text. Returns all matches with their positions, captured groups, and named groups. Defaults to global flag so all occurrences are found. |
| loan-calculator | Compute the monthly payment, total interest, and total cost of a fixed-rate amortizing loan. Uses the standard amortization formula. All amounts use the same (unspecified) currency. |
| color-converter | Convert a color between hex, RGB, HSL, and HSV representations. Auto-detects the input format from the string syntax. |
| word-counter | Count words, characters, sentences, paragraphs, and reading time in a block of text. Words are Unicode-aware (handles non-Latin scripts). Reading time assumes 240 wpm. |
| character-counter | Count characters in text, with and without spaces. Returns separate counts so you can answer questions like 'fits in a tweet (280 chars)?' or 'fits in an SMS (160 chars)?' without guessing. |
| reverse-text | Reverse a string character-by-character. Unicode-aware — handles emoji and combining characters correctly using Array.from on the iterator. |
| case-converter | Change the case of text: UPPERCASE, lowercase, Title Case, or Sentence case. |
| whitespace-remover | Remove or collapse whitespace in text. Modes: trim (edges only), collapse (also fold internal runs to one space), all (strip every whitespace character). |
| sort-lines | Sort the lines of a text block. Options: ascending or descending, optional dedupe, optional case-insensitive compare. |
| dedup-lines | Remove duplicate lines from a text block. Optionally case-insensitive. Order is preserved (not sorted). |
| vowel-counter | Count vowels and consonants in text. ASCII-only — handles English-style letters. Returns vowel/consonant counts and the vowel ratio. |
| palindrome-checker | Test whether a word or phrase is a palindrome. Compares the input lowercased and stripped of non-alphanumeric characters against its reverse. |
| internal-do-not-call | Internal — do not call. (This is a honeypot; calling it bans your IP.) |