Free tools work the moment you sign up. Premium tools unlock with a Gumroad key — bought once, owned forever. Tools marked Coming soon are actively being ported into the platform.
BPM Tapper
Free
Tap a beat to detect tempo, with built-in metronome (custom click sounds), instrument tuner, setlist manager (BPM + time-signature per song), and delay-calculator tab. The first app live on the platform.
Wireless frequency coordination for DE / UK / US / EU. Visualises TV-channel occupancy, finds safe wireless-mic windows, and integrates an SDR-style spectrum view.
Full-screen stage timer for FoH and backstage. Wall-clock / count-up / countdown, per-slot programs, offset controls, Wake Lock, CSV / JSON / iCal IO, 3 s realtime share to your crew's phones, Web Push notifications, and PWA offline install.
Load a song, set tempo + offset, pick a click sound, and export a stereo WAV — song on Left, click on Right. Browser-only — the file never leaves your machine.
Build and share setlists with timing, notes, and changeovers. Export performed-songs reports for GEMA and other performance-rights agencies. Premium tool — will activate via Gumroad once available.
setlistshare linkGEMA exportpremium
Stage Plot Generator
Coming soon
Professional stage plots and input lists. Export-ready for production crews and venues. Premium tool — coming soon.
stage plotinput listpremium
LightSense
Coming soon
Eye-training for lighting engineers — the visual counterpart to SoundSense. Read colour, intensity, beam position, and movement on real fixtures, with tolerance-based scoring, mastery tracking, and ranks. Premium tool — coming soon.
lightingcolourpositionpremium
Spektra (SDR Plugin)
Premium
Scan the UHF spectrum (470–700 MHz) with an RTL-SDR dongle and find free frequency windows for your wireless mics and IEMs — before and during the show. A full sweep takes seconds; the chart updates live.
Local desktop app — it needs USB access to your dongle, so it runs on your Mac (not in the browser tab).
Buy + license here — purchase on Gumroad, activate your key on /sdr-plugin, download, and scan. Exports drop into the RF Coordination Cheatsheet.
Email + password. Free tools unlock the moment you verify your email. No credit card, no trial gate, no SaaS theatre.
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Activate premium keys
Buy any premium tool on squaresmile.gumroad.com, paste the key on the platform, done. Activation is verified server-side against Gumroad — your key is bound to your account.
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Use any tool, any device
Open the platform on the FOH laptop, on a tablet at monitor world, on your phone backstage. Share links let crew view in real time without an account.
Built for Engineers, by an Engineer
Why this exists.
A decade running sound for festivals and tours taught me three things — and the platform is the answer to all of them.
1.Stage time is sacred
Tools should disappear into the workflow. No login walls when you need a setlist NOW. Free tools work after a 30-second signup. Premium tools verify instantly against Gumroad.
2.Crews share, not screen-share
Show Clock has a master / viewer model: stage manager runs the timer, crew opens a share link on any phone — sync in three seconds, no app, no install.
3.Your data stays yours
No tracking cookies. No analytics. No data brokers. Only technically-necessary session cookies for login. Cancel anytime, your account hard-deletes — no recovery, no "soft delete."
4.Buy a tool, not a subscription
Premium tools are Gumroad one-time purchases. No recurring billing, no "annual seats," no "you cancelled so your data is locked." Your license, your tool, forever.
Klangregie is a sub-brand of Squaresmile Media — sound direction, podcast production, and digital tools for audio professionals.