From MapYourTech

The optical engineer's field toolkit.

47 calculators, 59 reference tables, a 394-term glossary, 427 alarm definitions, 550 spec parameters, and a native OTDR .sor reader — on your phone, fully offline. No accounts. No tracking. Free.

Download on the App Store See what's inside ↓

No tracking

No analytics, no accounts, no SDKs. The privacy label reads "Data Not Collected" because there is nothing to collect.

Works offline

Every calculator, table, and the OTDR reader runs in airplane mode. Built for the field, the hut, and the cable landing station.

Free

All 47 tools, all reference data, the SOR reader. No purchases, no subscriptions, no ads.

Link design calculators

OSNR span design with FEC presets, EOL budget, nonlinear phase, Raman hybrid NF, GOSNR combining, rise-time budget, SBS/SRS thresholds, fiber modes, Shannon capacity.

OTDR .sor reader

Open Telcordia SR-4731 traces from any OTDR. Trace plot with color-coded events, span/loss/ORL analysis, threshold findings, and recommendations.

DWDM planning

Coherent rate and OSNR planning, guard-band rules with vendor floors, band capacity, ITU grid tools, and unit converters engineers use daily.

59 reference tables

Fiber standards G.652–G.657 side by side, coherent scaling laws, guard-band thumb rules, channel quick database, transceiver formats.

Glossary, alarms, specs

394 terms, 427 alarm definitions with troubleshooting, 550 specification parameters — one master search across all of it.

Made for daily use

Favorites pin your daily tools to Home. Ten accent themes, adjustable fonts and text size, full Dynamic Type and VoiceOver support.

Four tabs. Zero hunting.

CONVERT

dBm · mW · λ · f · OSNR/SNR

LINK

Budgets · OSNR · nonlinear

DWDM

Coherent · guard bands · grid

OTDR

.sor reader · event analysis

TABLES

59 engineering references

GLOSSARY

394 terms explained

ALARMS

427 with troubleshooting

SPECS

550 parameters · 97 groups

The "no data collected" badge isn't marketing.

The app makes no network requests. Your inputs, favorites, and trace files stay on the device. Verify it yourself with iOS App Privacy Report — you'll find nothing, because nothing is sent. Read the one-page privacy policy.

The things people ask first.

Where do the formulas come from?

Public ITU-T recommendations (G.652–G.657, G.694.1, G.696.1, G.97x), IEEE standards, and established fiber-optics texts. Each tool names the relationship it implements.

Which OTDR files does it open?

Telcordia SR-4731 .sor traces — the standard export of EXFO, VIAVI, Anritsu, Yokogawa, and most other OTDRs.

Does it need internet?

No. Everything works in airplane mode. The app makes no network calls.

iPhone and iPad?

Both, on iOS/iPadOS 17 or later.

Who builds it?

MapYourTech — the optical networking education platform at mapyourtech.com.