tools.jitty.jpFree web tools
Free tools and simulators that run in your browser. No sign-up needed. What you enter is processed inside each tool, on your device.
13 tools
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InternationalHome Battery Rebate & Size Calculator (Australia)
Free Australian battery calculator: federal rebate (STCs) under the Cheaper Home Batteries Program, best battery size, savings and payback from your postcode, solar size and daily usage. Updated for the May 2026 tiered rebate.
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CalculatorsJapan Solar & Battery Calculator
Free calculator for home solar and batteries in Japan: annual output by prefecture, self-consumption, export income under the FY2026 FIT, battery effect and payback years.
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CalculatorsJapan Akiya Cost Calculator
Free calculator comparing keeping, selling, demolishing, renting or handing over an inherited Japanese akiya, with property tax, demolition, the ¥30 million deduction and brokerage fees.
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Safety & hazardsJapan Hazard & Insurance Check
Check flood, storm-surge and tsunami depth and landslide zones anywhere in Japan from official hazard map data, plus fire and earthquake insurance tips. Free, no sign-up.
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CalculatorsJapan Property Price Estimator
Free estimate of land and house values anywhere in Japan from the 2026 Official Land Prices (24,000 sites). Choose a municipality, area and building age. Nothing is sent.
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Rules & deadlinesJapan Ikusei Shuro Transition Planner
Free planner for employers in Japan: see what happens to current technical interns when Ikusei Shuro starts in April 2027, and plan new intakes by sector.
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Print & generateStatic QR Code Maker
Make static QR codes that never expire, free. URL, Wi-Fi, contact (vCard), email, phone, SMS and map. Download PNG or SVG and print on A4 label sheets. No sign-up, no watermark, nothing uploaded.
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In-browser toolsDevice Test Hub
Free online device tests: webcam, microphone, left/right speakers, keyboard (US/UK/JIS), mouse, gamepad, MIDI, dead pixels, refresh rate and touch screen. No install; nothing leaves your browser.
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Print & generatePrintable Worksheet Maker
Free worksheet maker: math drills with answer keys, handwriting tracing, graph and staff paper, and flash cards. Print or save as PDF with no sign-up.
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CalculatorsJapan Land Use Checker
Free checker for idle land in Japan: see how your plot suits a low-voltage grid battery site, solar, parking, leasing or selling, based on area, land category and utility access.
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Rules & deadlinesJapan Property Registration Deadline Checker
Free checker for Japan's mandatory inheritance registration: 3-year deadline, days left, fine up to ¥100,000, heir declaration and post-division registration.
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CalculatorsJapan Mortgage Rate Rise Simulator
Free simulator for Japanese variable-rate mortgages: see monthly payments, total interest and unpaid interest when rates rise, including the 5-year and 125% rules.
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Print & generateSimple Printable Calendar
Free printable 2027 calendar maker. Yearly, monthly and planner layouts with US, UK, Canadian, Australian or Japanese holidays. Letter, A4, Legal and more. Print or save as PDF.