FreeToolHub
44 calculators for US taxes, business finance, and MCP server engineering.
Calculators for self-employment tax, 1099 income, capital gains, payroll, mortgages, rental ROI, and business break-even. Also includes MCP server tools for context budgeting, security audits, and configuration generation.
Try asking Muse: "Calculate my quarterly estimated tax payments as a freelancer in California."
Source: Found in the official MCP Registry (io.github.cavan1977/freetoolhub) · First listed September 24, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 2 h ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://freetoolhub.org/api/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 143ms. Worked in 100% of checks over 30 days.
Screening · September 24, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 40
calculate_se_taxCalculate US self-employment tax (15.3%), QBI deduction, quarterly payments. Uses latest IRS brackets from CDN data.calculate_freelancer_taxComplete freelancer tax: SE tax, QBI deduction, federal + state income tax. Returns quarterly payment. Uses latest CDN data.calculate_1099k_taxEstimate tax on 1099-K income (reselling, gig work). SE tax, QBI, quarterly 1040-ES. Uses latest CDN data.calculate_capital_gains_taxUS capital gains tax on stock/crypto. Short vs long-term, NIIT 3.8%, state tax. Uses latest CDN LTCG brackets.compare_w2_vs_1099Compare take-home pay: W-2 salary vs 1099 contractor rate. SE tax, FICA, standard deduction, state tax. Latest CDN data.get_sales_tax_rateGet state sales tax rate for any US state. Returns base state rate + estimated local rate. Latest CDN data.calculate_payroll_taxCalculate paycheck deductions: federal tax, Social Security, Medicare, state tax. All 50 states. Latest CDN data.calculate_estate_taxCalculate federal estate tax. 2026 exemption $13.61M, 40% rate. Includes marital deduction.calculate_hsa_fsa_savingsCalculate tax savings from HSA and FSA contributions. Federal + FICA + state tax savings. Latest CDN limits.calculate_quarterly_taxCalculate quarterly estimated tax payments (Form 1040-ES). SE tax + income tax divided by 4. Latest CDN data.check_economic_nexusCheck which US states you have economic nexus in for sales tax collection. Based on Wayfair ruling. Latest CDN thresholds.calculate_tariffEstimate import duties and landed cost by HS code category. Covers US MFN + Section 301 tariffs.calculate_compound_interestCompound interest with monthly contributions. Returns final balance, total interest, inflation-adjusted value. Uses latest CDN inflation rate.calculate_mortgageMonthly mortgage payment (P&I) + property tax, insurance, PMI. Full PITI breakdown. Uses latest CDN mortgage rates for defaults.compare_401k_vs_rothCompare 401(k) pre-tax vs Roth IRA post-tax. 30-year growth, tax drag, recommendation. Uses latest CDN contribution limits.calculate_car_loanMonthly car payment, total interest, amortization. Includes sales tax, trade-in, down payment. Uses latest CDN sales tax rates.calculate_rental_roiRental property ROI: cap rate, cash-on-cash return, NOI, annual cash flow. Includes vacancy and management.calculate_student_loanStudent loan payoff: monthly payment, total interest, months saved with extra payments.calculate_roiROI, ROAS, net profit, CPA, CPC for marketing campaigns. Facebook, Google, TikTok ad analysis.calculate_life_insuranceCalculate life insurance needs using DIME method: Debt, Income, Mortgage, Education.calculate_rental_affordabilityHow much rent can you afford? 30% rule, DTI ratio, comfortable rent range.calculate_home_equityCalculate home equity, max borrowable amount (HELOC), and monthly payments. LTV limits included.calculate_break_evenBreak-even point: units to sell to cover fixed costs. Contribution margin, target profit analysis.compare_llc_costCompare LLC formation and maintenance costs across US states. 5-year total cost. Uses latest CDN LLC state fees data.calculate_dropship_profitTrue dropshipping profit after product cost, platform fees, payment processing, ad spend. Uses latest CDN payment processor fees.calculate_reseller_profitCompare real profit across reselling platforms (eBay, Poshmark, Mercari, etc.) after fees. Uses latest CDN platform fee data.calculate_freelancer_pricingTurn hourly rate into project quote with overhead, profit margin, milestone splits.calculate_income_taxUS income tax for 2026: federal tax bracket by bracket, state tax, marginal vs effective rate. Uses latest IRS brackets from CDN data.calculate_tax_refundEstimate US tax refund or balance due before filing: tax owed minus withholding minus credits, federal and state. NOT the IRS refund tracker.calculate_loanAny fixed-rate loan: monthly payment, total interest, payoff time, and interest saved by extra monthly payments.calculate_retirementRetirement projection in today's dollars: projected nest egg, sustainable income at your withdrawal rate, gap, and the monthly contribution that closes it.calculate_marginGross margin AND markup for the same deal, plus reverse pricing from a target margin or markup and the real margin cost of a discount.calculate_pay_raiseWhat a raise is actually worth after tax. Runs the real brackets before and after, so bracket crossings are handled — not a flat marginal rate applied to the raise.estimate_mcp_context_budgetEstimate 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.compress_tool_definitionsShrink MCP tool descriptions and JSON schemas to cut context cost without changing how agents call them. Returns the compressed definitions plus exact token savings.score_mcp_server_trustScore 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.audit_mcp_server_securityAudit 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.generate_mcp_server_cardGenerate a SEP-1649 MCP Server Card (/.well-known/mcp/server-card.json) so crawlers and registries can discover your server without connecting to it.validate_mcp_server_cardValidate 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 advise_tool_portfolioToo 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.Recent checks
Link
https://freetoolhub.org/api/mcpQuestions about FreeToolHub in Muse
How do I connect FreeToolHub to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use FreeToolHub to help me. It is a free service with an MCP server at https://freetoolhub.org/api/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is FreeToolHub working right now?
At the last check (September 28, 2026, 07:01 UTC) the endpoint was working, answering in 143ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is FreeToolHub safe to connect to Muse?
It was screened on September 24, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can FreeToolHub do in Muse?
It exposes 40 tools, including calculate_se_tax, calculate_freelancer_tax, calculate_1099k_tax, calculate_capital_gains_tax. For example, you could ask Muse: "Calculate my quarterly estimated tax payments as a freelancer in California."
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This listing was added from public sources (Found in the official MCP Registry (io.github.cavan1977/freetoolhub)). If you build FreeToolHub, claim it to correct the details and get your badge.
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