Clock84
Retro time instruments in your browser
A free red-LED-style digital clock combined with stopwatch, countdown timer, world clocks, browser alarms and a full-featured chess clock.
Open Clock84 →Arcana Synthetica develops independent tools for useful everyday work, family life, personal discovery and digital convenience. Explore our current public products below.
A free red-LED-style digital clock combined with stopwatch, countdown timer, world clocks, browser alarms and a full-featured chess clock.
Open Clock84 →A free invoicing workspace with quotations, credit notes, PDF and other export options, plus a VAT calculator, hourly-rate calculator, payment reminders and quarterly VAT overview.
Open NotaDirect →Use one compatible device near the baby and another as a monitor, connected using a QR code. Designed for audio/video monitoring without a dedicated app; not a substitute for attentive adult supervision.
Open Babyphone.online →Pair a phone, tablet and computer using a QR code, then send photos, PDFs and other files between browsers. Direct encrypted transfer where supported, without a cloud file library.
Open DropToPhone →A free questionnaire with 120 questions assessing 30 traits and 12 broad dimensions. It generates an explainable personal report for self-reflection, not a medical or psychological diagnosis.
Open Arcana Profile →Features are described from public product information available in October 2026 and may evolve. See each product for current functionality and limitations.