Calc MCP vs REA
A side-by-side look at the Calc MCP and REA MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Calc MCP for developer tools work as a local process; choose REA for developer tools as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Calc MCP when
- You need dedicated capabilities in the Developer Tools domain.
- You prefer a local stdio subprocess transport.
- You want tools like
random, hash, base64.
Choose REA when
- You need dedicated capabilities in the Developer Tools domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Developer Tools | Developer Tools |
| Quality signal | 65/100 · Great | 56/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | No auth required |
| Pricing | Not declared | Free |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 9 | 385,218 |
| Directory activity | 0 views 0 installs 0 upvotes | 15 views 0 installs 0 upvotes |
| Tools | 21 | Not listed |
| Full listing | View Calc MCP | View REA |
Tools & capabilities
Calc MCP tools 21
randomGenerate random values: UUID, ULID, secure password (with fine-grained options), random number, or shuffle a listhashCompute hash or HMAC of a string using MD5, SHA1, SHA256, SHA512, or CRC32. WARNING: MD5 and SHA1 are cryptographically broken and MUST NOT be used for security (use SHA-256 or SHA-512 instead).base64Encode or decode Base64 stringsencodeEncode or decode strings using URL, HTML, or Unicode encodingdatetimeGet current datetime, convert timezones, format dates, and convert UNIX timestampscountCount characters (grapheme clusters), words, lines, and bytes in textmathEvaluate math expressions or compute statistics on numbersdateDate calculations: diff between dates, add to date, weekday, and Japanese wareki conversionregexTest, match, matchAll, or replace using regular expressionsbaseConvert numbers between bases (2-36), supports large numbers via BigIntdiffCompare two texts: line-by-line diff (Myers algorithm, falls back to full replacement if edit distance exceeds 1000) or Levenshtein distanceformat_validateValidate and parse JSON, CSV, XML, or YAML strings- +9 more on the listing page
REA tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Calc MCP
{
"mcpServers": {
"calc-mcp": {
"command": "npx",
"args": [
"-y",
"@coo-quack/calc-mcp@2.1.2"
]
}
}
}
REA
{
"mcpServers": {
"rea": {
"command": "npx",
"args": [
"-y",
"rea-agents"
]
}
}
}
Frequently asked questions
Calc MCP is categorized under Developer Tools and uses a local stdio subprocess. REA belongs to Developer Tools and uses a local stdio subprocess. Pick Calc MCP for developer tools work and REA for developer tools.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Calc MCP has no declared pricing — check the project's own site. REA is listed as free. Auth: no auth required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add calc-mcp and rea as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Calc MCP has a quality signal of 65/100 (Great) with 0 views, 0 installs and 9 GitHub stars. REA has 56/100 (Good) with 15 views, 0 installs and 385,218 GitHub stars.