Overtrace is a browser-based industrial telemetry overlay tool. You load datalogs from multiple modules — compressors, gen skids, engine ECMs — and overlay every channel on one shared time axis so you can see what happened, and when, across the whole system at once.

Which datalog formats does Overtrace support?

Overtrace auto-detects Emit (Dynamic Controls), Caterpillar, Waukesha and Excel datalogs, with more formats coming. Just drop the files in and the channels are parsed and plotted automatically.

Is my telemetry data uploaded to a server?

No. All parsing happens entirely in your browser using local JavaScript in a Web worker. There is literally no upload endpoint — your datalogs never leave your machine. That privacy-by-architecture is a core part of the design.

Do I need to install anything?

No install required. Overtrace runs in any modern browser on desktop, laptop or field tablet, and works even on a spotty plant network because everything is client-side.

Can I try Overtrace before buying?

Yes. The full-featured demo runs on built-in sample telemetry, so you can try measuring, overlays and alignment for free. A license unlocks uploading your own logs, and it is tied to your account rather than a single device.

Licensing: Starter, Pro, and Pro Perpetual

Overtrace sells three things: Starter, Pro, and Pro Perpetual. Everything runs in your browser either way — a license changes what the app will let you load and which analysis tools are unlocked, never where your data goes. This page is the detailed version of the pricing page.

Demo mode (no license)

Without a license the app loads two built-in sample modules so you can use the tools on realistic telemetry. Loading your own logs is locked until you buy — the upload button shows a padlock.

The 24-hour trial pass

A trial pass is full Pro access for 24 hours, not a limited version. Unlimited modules and channels, no file-size caps, every format, and every Pro analysis tool — so what you try is exactly what a Pro license gives you. It takes an email address, no card. When the pass expires the app returns to demo mode until you buy.

Starter — $12/month or $120/year

For a single tech looking at one shift at a time. Starter loads your real logs, with size and breadth caps rather than feature lockouts on the basics.

All log formats supported — Emit, Excel, Caterpillar, Waukesha, and COMTRADE.
Up to 2 modules loaded on the chart at once.
Up to 10 analog channels plotted simultaneously. Digital / boolean event flags do not count against this limit.
Up to 10 MB per module file.
Up to 20 MB total across everything loaded on the chart.
Cursor readout, point-to-point measurement, module alignment, and digital event flags.
Import shared analysis sessions. If the file was exported from Pro, it opens as a read-only preview.

Not included in Starter: channel locks, per-channel offset and scaling, multiline tags and editable drawings, capture export, exporting .otsession.json files, and paired synchronized windows.

Pro — $29/month or $290/year

For consultants and analysts doing real comparative work across several modules at once.

Everything in Starter.
Unlimited modules and unlimited simultaneously-plotted channels.
No file-size caps — no per-module or per-chart byte limit.
Channel locks and per-channel offset & scaling.
Multiline tags, editable drawings, and capture export.
Export .otsession.json in both overlay-only and full-with-data variants.
Paired synchronized analysis windows across two monitors.
Data index viewer and early access to newly released format parsers.
Priority support with a 2 business-day response target.

Pro Perpetual — $899 one-time

Every Pro feature, bought outright. No subscription, no renewal, and no expiring access. All v1.x updates are included at no extra cost; a future v2.x major release is a separate paid upgrade.

Every Pro capability, permanently.
All v1.x updates included.
No recurring invoices and no expiry date on the license.
Tied to your account, so it works on every device you sign in from.
Priority support with a 2 business-day response target.

What counts against the Starter limits

A module is one source file you loaded — Starter allows 2 on the chart at a time. Remove one to load another.
The 10-channel cap counts analog traces that are currently plotted, not the number of channels available in the sidebar. Untick a trace to free a slot.
Digital / boolean event flags are not analog traces and do not use up the 10 slots.
The 10 MB cap is per file at load time; the 20 MB cap is the total of all modules currently on the chart.

Hitting a Starter cap never loses work already on the chart — the app declines the new module or channel and tells you which limit you reached.

Changing plans, billing, and refunds

Monthly and annual plans are managed from your Account page, which opens the Stripe billing portal for upgrades, payment method changes, and cancellation.
Annual billing is priced at ten months — $120/yr for Starter and $290/yr for Pro.
Cancelling stops future billing; access continues until the end of the paid period, after which the app returns to demo mode.
Refund requests go through support — see the Refunds page for the policy.

FAQ

What is the difference between Starter and Pro in Overtrace?

Starter loads up to 2 modules with up to 10 plotted analog channels, 10 MB per module and 20 MB per chart, and covers the core cursor, measurement and alignment tools. Pro removes every one of those limits and adds channel locks, offset & scaling, multiline tags and drawings, capture export, session export, and paired synced windows.

Does Starter support all datalog formats?

Yes. Every supported format — Emit, Excel, Caterpillar, Waukesha, and COMTRADE — works on Starter. The Starter limits are on how many modules and channels you can have on the chart and how large the files are, not on which formats parse.

Do digital event flags count toward the 10-channel Starter limit?

No. Only simultaneously-plotted analog channels count against the limit of 10. Digital and boolean event flags are unlimited on every plan.

What does Pro Perpetual include for $899?

Every Pro feature permanently, with all v1.x updates included and no subscription. A future v2.x major release would be a separate paid upgrade.

What does the 24-hour trial pass include?

Full Pro access for 24 hours — unlimited modules and plotted channels, no file-size caps, every supported format, and every Pro analysis tool. It is not a reduced tier: you are trying the top plan. No card is required, and the app returns to demo mode when the pass expires.

Can I open a Pro session file on a Starter license?

Yes, as a read-only preview. Importing sessions works on every plan; exporting .otsession.json files is a Pro feature.

What happens to my access if I cancel?

Billing stops and your license stays active until the end of the period you already paid for. After that the app falls back to demo mode with the built-in sample data — your own files are never held hostage, since nothing was ever uploaded.