FreeToolHub
44 calculators for AI agents: US tax, finance, business + an MCP engineering & security suite.
Little public usage data yet
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If you have run it, two minutes of your experience saves the next person an afternoon.
Tools (44, 3 write)
write = sends, deletes, buys or postsadvise_tool_portfolioFreeToo many MCP tools makes agents pick the wrong one. Given your tool list and usage, get keep / merge / remove recommendations to get under the 10–15 tool guideline.
audit_mcp_server_securityFreeAudit an MCP server against the OWASP MCP Top 10. Reports authentication, path traversal, command injection, secret exposure and supply-chain risk with a concrete remediation list.
calculate_1099k_taxFreeEstimate tax on 1099-K income (reselling, gig work). SE tax, QBI, quarterly 1040-ES. Uses latest CDN data.
calculate_break_evenFreeBreak-even point: units to sell to cover fixed costs. Contribution margin, target profit analysis.
calculate_capital_gains_taxFreeUS capital gains tax on stock/crypto. Short vs long-term, NIIT 3.8%, state tax. Uses latest CDN LTCG brackets.
calculate_car_loanFreeMonthly car payment, total interest, amortization. Includes sales tax, trade-in, down payment. Uses latest CDN sales tax rates.
calculate_compound_interestFreeCompound interest with monthly contributions. Returns final balance, total interest, inflation-adjusted value. Uses latest CDN inflation rate.
calculate_dropship_profitFreeTrue dropshipping profit after product cost, platform fees, payment processing, ad spend. Uses latest CDN payment processor fees.
calculate_estate_taxFreeCalculate federal estate tax. 2026 exemption $13.61M, 40% rate. Includes marital deduction.
calculate_freelancer_pricingFreeTurn hourly rate into project quote with overhead, profit margin, milestone splits.
calculate_freelancer_taxFreeComplete freelancer tax: SE tax, QBI deduction, federal + state income tax. Returns quarterly payment. Uses latest CDN data.
calculate_github_actions_costFreeEstimate a GitHub Actions monthly bill using the January 2026 runner rates (Linux $0.006/min, Windows $0.010, macOS $0.062), accounting for plan allowances. Also reports what the same workload cost before the price cut.
calculate_home_equityFreeCalculate home equity, max borrowable amount (HELOC), and monthly payments. LTV limits included.
calculate_hsa_fsa_savingsFreeCalculate tax savings from HSA and FSA contributions. Federal + FICA + state tax savings. Latest CDN limits.
calculate_life_insuranceFreeCalculate life insurance needs using DIME method: Debt, Income, Mortgage, Education.
calculate_mortgageFreeMonthly mortgage payment (P&I) + property tax, insurance, PMI. Full PITI breakdown. Uses latest CDN mortgage rates for defaults.
calculate_payroll_taxFreeCalculate paycheck deductions: federal tax, Social Security, Medicare, state tax. All 50 states. Latest CDN data.
calculate_quarterly_taxFreeCalculate quarterly estimated tax payments (Form 1040-ES). SE tax + income tax divided by 4. Latest CDN data.
calculate_rental_affordabilityFreeHow much rent can you afford? 30% rule, DTI ratio, comfortable rent range.
calculate_rental_roiFreeRental property ROI: cap rate, cash-on-cash return, NOI, annual cash flow. Includes vacancy and management.
calculate_reseller_profitFreeCompare real profit across reselling platforms (eBay, Poshmark, Mercari, etc.) after fees. Uses latest CDN platform fee data.
calculate_roiFreeROI, ROAS, net profit, CPA, CPC for marketing campaigns. Facebook, Google, TikTok ad analysis.
calculate_se_taxFreeCalculate US self-employment tax (15.3%), QBI deduction, quarterly payments. Uses latest IRS brackets from CDN data.
calculate_student_loanFreeStudent loan payoff: monthly payment, total interest, months saved with extra payments.
calculate_tariffFreeEstimate import duties and landed cost by HS code category. Covers US MFN + Section 301 tariffs.
check_economic_nexusFreeCheck which US states you have economic nexus in for sales tax collection. Based on Wayfair ruling. Latest CDN thresholds.
compare_401k_vs_rothwrite actionFreeCompare 401(k) pre-tax vs Roth IRA post-tax. 30-year growth, tax drag, recommendation. Uses latest CDN contribution limits.
compare_ai_coding_tool_costsFreeCompare monthly and annual cost of AI coding subscriptions (GitHub Copilot, Cursor, Claude Code/Pro/Max, OpenAI Codex) for a given team size and usage intensity, then compare the winner against pay-as-you-go API pricing for the same workload. Prices verified 2026-09.
compare_automation_platform_costsFreeCompare real monthly cost on Zapier (per task) versus Make (per operation) for the same workflow volume, including the counting-model difference that makes the two quotes non-obvious.
compare_llc_costFreeCompare LLC formation and maintenance costs across US states. 5-year total cost. Uses latest CDN LLC state fees data.
compare_llm_api_costsFreeRank 18 LLM models by the real monthly cost of a given workload (input/output tokens per call × calls per month). Reports the cheapest and most expensive option, the cost spread, and which models can actually hold your prompt in their context window.
compare_w2_vs_1099write actionFreeCompare take-home pay: W-2 salary vs 1099 contractor rate. SE tax, FICA, standard deduction, state tax. Latest CDN data.
compress_tool_definitionsFreeShrink MCP tool descriptions and JSON schemas to cut context cost without changing how agents call them. Returns the compressed definitions plus exact token savings.
detect_polling_cost_trapsFreeFind the most common hidden cost in no-code automation: using polling where a webhook would do. Quantifies the wasted task/operation quota and the monthly dollars.
estimate_mcp_context_budgetFreeEstimate how much of an LLM context window your MCP servers consume, and which tool definitions to cut first. Paste your MCP config. Returns per-server token cost, remaining budget, and ranked reduction advice.
estimate_selfhosted_tcoFreeCompare paying hosted CI overage against running self-hosted runners, including the maintenance hours people forget to cost. Reports the true break-even volume.
find_toolFreeSemantic tool router. Given a natural-language intent, return only the most relevant tools from this server so the client can inject 3 schemas instead of 27. This is the "find_tool" meta-tool the MCP optimisation literature calls for.
generate_mcp_client_configFreeGenerate ready-to-paste MCP server config for Claude Desktop, Cursor, VS Code and Windsurf from one input. Config completeness decides whether developers can install your server at all.
generate_mcp_server_cardFreeGenerate a SEP-1649 MCP Server Card (/.well-known/mcp/server-card.json) so crawlers and registries can discover your server without connecting to it.
get_sales_tax_rateFreeGet state sales tax rate for any US state. Returns base state rate + estimated local rate. Latest CDN data.
plan_context_window_budgetFreeGiven a set of MCP servers and their tool counts, show for every model context window (128K, 200K, 1M, 10M) how much of the window the tool definitions consume, how much is left for conversation, and whether the server set fits at all. Answers "how many servers can I attach on model X?".
plan_mcp_token_budgetFreePlan and attribute MCP token spend across agents, servers and workflows — something the protocol provides no native support for. Outputs per-dimension cost split and a quota plan.
score_mcp_server_trustFreeScore an MCP server A–F on trustworthiness and maintenance health, so you can choose between four servers that all claim to do the same thing. Supply what you know about the server.
validate_mcp_server_cardwrite actionFreeValidate an MCP Server Card against SEP-1649 and report every missing or malformed field before you publish it. Checks structure (serverInfo, transport, capabilities, authentication) and format (semver version, http(s) transport URL, capabilities.tools entries), returning a full error and warning list.
Public scan report
scanner v0.1.3 · 2026-09-19 · same rubric, same numbers if you re-run it
- –Code scanremote-only server, no package to scann/a
- Live reliabilityremote reachable in 473ms20/20
- Tool poisoning44 tool descriptions checked15/15
- Auth qualityAPI key sent as a header8/15
- Maintenancerepository not readable: repo not found3/15
- Maintainer identityno repository or website to verify2/10
Install directly
claude mcp add --transport http freetoolhub https://freetoolhub.org/api/mcp
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