Maris Stella LabsNew free, browser-only calculators and checks for people who run a small business. No account, no upload: every number stays on the visitor's own device.tag:marisstella.dev,2026:maris-stella-labs2026-10-30T00:00:00ZTools are MIT-licensed. They are estimates and records to act on, not professional advice.Babysitting Business Kit: free, private, in your browsertag:marisstella.dev,2026:tool/babysitting-business-kit2026-10-30T00:00:00Z2026-10-30T00:00:00ZFree app for babysitters who run their own business: score and answer inquiries, quote and schedule sits without double-booking, track who has paid, set aside self-employment tax with quarterly due dates, collect references and testimonials with consent, build your own babysitting website and plan posts. Runs in your browser; nothing is uploaded.Find copy-pasted code, fasttag:marisstella.dev,2026:tool/dupehound2026-10-29T00:00:00Z2026-10-29T00:00:00ZDrop a project folder and see every copy-pasted block: file, lines and the matching copy. A Rust copy-paste detector compiled to WebAssembly. Nothing is uploaded. Also a CLI that checked 9,458 files in 1.2 seconds.Shed Designer: drag out a gable shed, get the plans and the cut listtag:marisstella.dev,2026:tool/shed-designer2026-10-29T00:00:00Z2026-10-29T00:00:00ZDesign a gable shed by dragging: get framing plans for the foundation, floor, four walls and roof, a 3D view, a lumber cut sheet using real 2x4 to 2x12 sizes and 8 to 16 ft boards, and a cost estimate. Free, nothing uploaded.Agentic Trading Labtag:marisstella.dev,2026:tool/agentic-trading-lab2026-10-28T00:00:00Z2026-10-28T00:00:00ZFree, open-source research agent for trading your own account: backtests published momentum and trend rules on 100 years of US industry data and on BTC/ETH, charges for every strategy it tries (Deflated Sharpe, PBO), and only then lets you paper trade on Alpaca or trade crypto through Robinhood's official API.VSME Report Builder — Free Sustainability Report for Small Suppliers (Basic Module)tag:marisstella.dev,2026:tool/vsme-report-builder2026-10-26T00:00:00Z2026-10-26T00:00:00ZFree VSME Basic Module report builder for small EU suppliers asked for ESG data by customers or banks: fill in energy, emissions, workforce and safety figures, get a draft report, a completeness check and consistency flags. Runs in your browser; nothing is uploaded.Agent Workroom: a 3D room for your AI agents' taskstag:marisstella.dev,2026:tool/agent-workroom2026-10-24T00:00:00Z2026-10-24T00:00:00ZWalk around a 3D room where each AI coding agent has a desk and every task sits on the wall. Add and move tasks by voice or text, and pull progress from a GitHub repo's pull requests. Free, runs in your browser.AI Bookkeeper: double-entry books that learn from your correctionstag:marisstella.dev,2026:tool/ai-bookkeeper2026-10-21T00:00:00Z2026-10-21T00:00:00ZFree AI bookkeeping in your browser. Import bank and card CSVs, get an account suggested for every line with a reason, file the review queue once and it learns your payees. Transfers paired, trial balance, P&L, balance sheet, close checks, QuickBooks and Xero journals. Nothing uploaded.Open Floor Robots — DIY robot vacuum, robot mop and vacuum-mop combotag:marisstella.dev,2026:tool/open-floor-robots2026-10-21T00:00:00Z2026-10-21T00:00:00ZDIY robot vacuum, robot mop and robot vacuum-mop combo: open-source hardware (MIT) with laser-cut and 3D-printed parts, ESP32 firmware, a coverage path planner, and a cleaning simulator you can try in your browser on your own room.Open House Plans: free, parametric house plans you can downloadtag:marisstella.dev,2026:tool/open-house-plans2026-10-21T00:00:00Z2026-10-21T00:00:00ZGenerate a free house plan from a sentence: floor plan, elevations, 3D model (IFC, OBJ), CAD (DXF), bill of materials and a cost estimate. 1 to 5 bedrooms, farmhouse, craftsman, modern, ranch and cottage styles. Public domain, runs in your browser.Open Robot Mower — build a DIY robotic lawn mowertag:marisstella.dev,2026:tool/open-robot-mower2026-10-21T00:00:00Z2026-10-21T00:00:00ZBuild your own robot lawn mower. An open-source robotic mower with wire-free RTK GNSS navigation, a guarded pivoting-blade disc, a floating bump shell, ESP32 safety firmware and a complete CAD manufacturing package (MIT). Plan your own lawn's mowing pattern in the browser.Sales Agent — sort sales replies, update your list, approve the draftstag:marisstella.dev,2026:tool/sales-agent2026-10-21T00:00:00Z2026-10-21T00:00:00ZFree AI sales agent for the replies to your outreach. Paste them in: it spots unsubscribes, bounces, out-of-office and not-now replies, updates your list, and drafts answers to the interested ones for you to approve. Never sends anything.Support Agent — AI customer service that knows when to hand offtag:marisstella.dev,2026:tool/support-agent2026-10-21T00:00:00Z2026-10-21T00:00:00ZAn open-source AI support agent you host yourself: it answers customers from your own help articles, cites them, offers articles when unsure and hands off to a person on refunds, legal threats or anything it can't answer. Measured on BANKING77. Try it in your browser.Wall Framing Takeoff — free, private, in your browsertag:marisstella.dev,2026:tool/wall-framing-takeoff2026-10-21T00:00:00Z2026-10-21T00:00:00ZFree wall framing calculator for builders and framers. Enter walls, doors and windows; get the stud layout 16 or 24 on center, kings, jacks, headers and cripples, a cut list, plate splices over studs and the cheapest mix of board lengths to buy. Runs in your browser.Changepoint Detector — when did your series change?tag:marisstella.dev,2026:tool/changepoint-detector2026-10-20T00:00:00Z2026-10-20T00:00:00ZFree changepoint detection for any time series. Paste a CSV and see when the level or volatility changed, with exact PELT segmentation and Bayesian online changepoint probabilities (Adams & MacKay 2007; Killick et al. 2012). Runs in your browser; nothing is uploaded.Conformal Prediction Intervals Calculator — free, private, in your browsertag:marisstella.dev,2026:tool/conformal-prediction-intervals2026-10-20T00:00:00Z2026-10-20T00:00:00ZFree conformal prediction intervals calculator. Paste a CSV, pick the column to predict and a coverage level, and get distribution-free prediction intervals with a finite-sample guarantee: split conformal, locally weighted conformal and conformalized quantile regression (CQR), checked on held-out rows. Runs in your browser; nothing is uploaded.CSV to SEPA pain.001 — free, private, in your browsertag:marisstella.dev,2026:tool/csv-to-sepa-pain0012026-10-20T00:00:00Z2026-10-20T00:00:00ZFree CSV to SEPA converter: turn a spreadsheet of supplier or payroll payments into a pain.001 XML file for your bank's bulk upload. Checks every IBAN and amount first, writes exact control totals, and never uploads your list.CSV to SEPA pain.008 direct debit — free, private, in your browsertag:marisstella.dev,2026:tool/csv-to-sepa-pain0082026-10-20T00:00:00Z2026-10-20T00:00:00ZFree CSV to SEPA direct debit converter: turn a spreadsheet of member or customer collections into a pain.008 XML file for your bank. Checks every IBAN, mandate and your creditor identifier first, groups FRST/RCUR/OOFF/FNAL batches, and never uploads your list.Hearth & Horizon: free AI-written science fiction and Catholic bedtime stories, with audiotag:marisstella.dev,2026:tool/hearth-and-horizon2026-10-20T00:00:00Z2026-10-20T00:00:00ZFree short science fiction about the next thousand years, stories written for AI agents, and Catholic bedtime stories about the saints. Read or listen; podcast RSS feeds; CC BY-SA 4.0.Interview Content Studio: one interview, a month of content for every platformtag:marisstella.dev,2026:tool/interview-content-studio2026-10-20T00:00:00Z2026-10-20T00:00:00ZAnswer one guided interview about your brand or topic and get a 4-week content calendar with drafts for LinkedIn, Instagram, TikTok, YouTube, X, newsletters, blogs and more. Free, runs in your browser, optional AI on your own key.Matrix Profile Explorer — find repeated patterns and anomalies in a time seriestag:marisstella.dev,2026:tool/matrix-profile-explorer2026-10-20T00:00:00Z2026-10-20T00:00:00ZFree matrix profile tool for time series anomaly detection and motif discovery. Paste or upload a CSV and find repeated patterns (motifs) and the most unusual stretches (discords) with the exact STOMP algorithm. Runs in your browser; nothing is uploaded.