Eighteen tools. Eighteen real problems. Built to be useful.

A world of measures. Made simple.

11 international conversion categories plus Romanian and Serbian land measures, with explicit regional conventions. English, Romanian, Serbian Latin and Serbian Cyrillic. Saved conversions stay in the browser; shareable links carry only the conversion you choose to share.

One standalone HTML file · zero dependencies · precision control · all-unit equivalents · light / dark · offline HTML download

Lives in its own repository: TekiDeki/Unit-Converter.

Never lose the grocery-aisle math again.

Type in two products (price + size) → instant price-per-unit verdict: "B is 12% cheaper." That's it.

g ↔ kg ↔ oz ↔ lb · ml ↔ L · 4 languages (EN / RO / SR lat. / СР ћир.) · shareable links · offline PWA · ~18 KB total

Take control of your finances - without handing over your data.

Track income & expenses, categorize spending, watch real-time analytics and interactive charts. Your data never leaves the browser.

Income & expenses · categories · interactive charts · spending insights · installable PWA on Android, iOS & desktop

The Luminance Master - craft perfect prompts for AI image generators.

Stop guessing what words work. Pick from curated dropdowns - lighting, composition, camera, film stock, atmosphere - and the tool assembles a coherent, engine-specific prompt.

Midjourney · FLUX.1 · Stable Diffusion · DALL-E 3 · 14 presets · 18 SD models with trigger words · live prompt score · batch processing

Your BMI in two taps - in four languages.

Weight + height → instant BMI with category and clear result. Română · English · Srpski · Српски, dark & light theme, shareable language links, works offline.

4 languages with hreflang · dark/light theme · share button · offline PWA · 17 KB total

See how any page looks on iPhone, iPad, Android and desktop - in seconds.

Load a local HTML file or paste a URL, and it renders inside real device frames. For developers, designers and anyone who ships for small screens.

12 devices · 13 aspect ratios · custom sizes · portrait/landscape · zoom · offline PWA

A private bet journal - not betting advice.

Record and settle bets, review net profit and settled-bet ROI, and export JSON backups. No account, no tracking; data stays in your browser.

4 languages · edit records · independent currency setting · light/dark theme · offline PWA · Apache-2.0

Monthly payment, total interest and a full repayment plan.

Enter a loan and see the monthly payment, total interest, payoff date and a full schedule. Test extra payments, export CSV. Everything stays in your browser.

Monthly payment · extra payments with savings · full schedule · balance chart · CSV export · 4 languages · offline PWA · Apache-2.0

Build it on a breadboard. Press Simulate. See what happens.

Place batteries, resistors, LEDs, transistors, relays and sensors on a breadboard, then simulate currents, voltages and power. An LED without a resistor burns, and stays burned. Learn with 10 lessons, 60 quiz cards and 12 broken circuits to repair.

Breadboard · 12 part types · burn mechanics · 10 lessons · 60 quiz cards · 12 broken circuits · works on tablets · 4 languages · offline PWA · Apache-2.0

Find a word. Start an idea.

Generate random words in four languages for writing, language practice or creative prompts. Filter by length, copy a word and revisit recent history - all locally.

4 languages · strict filters · copy · per-language history · light/dark theme · offline PWA · zero dependencies

Placeholder text, exactly how you need it.

Generate paragraphs, sentences or an exact word count. Copy the text or download a plain TXT file - no accounts, no tracking, no backend.

4 interface languages · 3 length presets · copy & TXT export · light/dark theme · offline PWA · zero dependencies

Random by design. Private by default.

Generate passwords locally with Web Crypto. Choose length and character sets, reveal only when needed, copy or export TXT after a plaintext warning. No saved passwords, accounts or tracking.

8-128 characters · batches up to 100 · 4 interface languages · estimated entropy · light/dark theme · offline PWA · HTTPS/localhost required

Point, scan, know. Nothing is uploaded.

Scan QR codes and barcodes with the camera or from an image, and see product details for EAN/UPC codes straight from Open Food Facts. Content is understood, not just printed: links, WiFi, contacts, e-mail, phone, geolocation, product codes.

QR + EAN/UPC/Code 128/DataMatrix · Open Food Facts enrichment with local cache · scan history with JSON export/import · 4 languages · offline PWA after the first visit

Smaller photos. Without the metadata.

Batch compress and resize images right in the browser, and get them back with the EXIF, GPS, camera and timestamp data removed. Set quality and maximum width once, then download single files or the whole batch as one ZIP.

Batch up to 60 images · EXIF and GPS stripped · quality and max width · JPEG / WebP / PNG · ZIP download · 4 languages · offline PWA

Listen to text with voices available in your browser.

Paste text or load a .txt file, split it into chapters and listen with browser voices. Choose a voice and adjust the speed. The interface is available in English, Romanian, Serbian Latin and Serbian Cyrillic. Audio-file export is not included.

Local voices process text on the device; online voices may send text to their provider for synthesis. Voice availability depends on the browser, operating system, locale and installed or online voices.

Four interface languages · chapter playback · voice selection · speed control · offline support with a local voice · Apache-2.0

Every color, measured. Nothing uploaded.

Pull a palette out of a photograph with k-means, build harmonies and gradients from it, and measure WCAG 2.x contrast with a suggestion for the nearest accessible color. The same palette is then shown through the eight most common color vision deficiencies, using all 33 matrices published by Machado, Oliveira and Fernandes (2009) applied in linear RGB. Export as CSS variables, Tailwind, SCSS, JSON, SVG or PNG.

Palette from an image · seven harmonies · WCAG AA / AAA · 8 colour blindness simulations · CSS / Tailwind / SCSS / JSON / SVG / PNG · 4 languages · offline PWA

Your cycle, on your device.

A menstrual calendar that logs flow, symptoms, mood, notes and basal temperature, groups those days into periods and predicts the next ones from your own averages. The fertile window, the estimated ovulation day and the PMS window are drawn straight onto the calendar, and Insights shows every cycle length, the shortest and longest cycle and the variation between them. Logged days always win over an estimate. English first, with Romanian and Serbian in both scripts.

Flow and symptoms · own-average predictions · fertile window and ovulation · backup export / import · print summary · 4 languages · offline PWA

Passport photos, printed at home.

Crops one photo to the size a document asks for, 35 x 45 mm for Schengen visas and most of Europe, 30 x 40 mm for the Romanian identity card, 51 x 51 mm for the United States, or any custom size. Three guide bands show where the crown, the eyes and the chin belong, taken from the published ICAO and EU ranges. The cropped photo is then laid out on a 10 x 15, 13 x 18 cm or A4 sheet at 300 dpi with corner cut marks, ready to print or download as a PNG that carries its own density. English first, with Romanian and Serbian in both scripts.

Millimetre guides · six photos per 10 x 15 sheet · 300 dpi print and PNG · honest quality chips · 4 languages · offline PWA

The priorities behind my tools:

"The best code is the code you don't have to ship."