Comparison

Comtrade Viewer vs otsora

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

Comtrade Viewer

Features
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COMTRADE Viewer is an easy-to-use tool for viewing and analyzing power system event records. Display waveforms directly on your device. Now includes incremental based double-ended fault locator based on method of Kasztenny and Smelich. Supported file formats include: β€’ COMTRADE (ASCII and Binary) β€’ SEL .cev, .eve, and .evzip event records β€’ SEL Motor Start Reports (.msr and .cmsr) β€’ Beckwith M-3425A, M-3430, and M-3311A .osc records β€’ S&C IntelliRupter Fault Interrupter records (.wfc) β€’ ATP/EMTP .pl4 files Open files directly from Mail, Files, AirDrop, and other supported apps, or explore the included sample records to get started. Built for power system engineers and technicians who need quick access to event records while in the field, at the office, or on the go.

About

otsora

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otsora is a private, on-device otdr trace viewer for fiber-optic technicians. open a .sor file from anywhere β€” files, airdrop, email β€” and get an instant analysis: Β· fiber length, total loss, optical return loss Β· per-event splice loss, reflectance, slope Β· vendor-quirk handling for exfo, viavi, anritsu, yokogawa, jdsu export any single-core analysis as a pdf link report. cable pro (one-time purchase) Β· analyze a multi-core cable in one pass β€” 1 to 288 cores Β· ranked repair locations across cores (splice clusters within 200 m) Β· per-core verdict + end-event classification (cut, crushed, mated pc, off-route…) Β· attach a kml/kmz route and see exactly where on the map to send a crew Β· watermark-free cable + per-core pdf reports try cable pro free for 7 days. no subscription and no automatic charge. after the trial, unlock pro permanently with one payment of US$15 (local prices vary). the single-core viewer stays free. restore your purchase from the account tab. private by design β€” traces never leave the device. no account, no upload, no telemetry. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://otsora.com/legal/privacy

Screenshots

Comtrade Viewer4 screens
otsora4 screens

Verdict

The call

The clearest difference is in-app purchases: Comtrade Viewer at none against otsora's 1. Comtrade Viewer also leads on update cadence (fortnightly vs every 4 months) and device support (3 vs 1). On price and ads there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. otsora sells 1 in-app purchase, starting at $12.00 per month. Comtrade Viewer asks for nothing beyond the download.

UpkeepUpdate frequency

Comtrade Viewer ships an update fortnightly, otsora every 4 months. The most recent releases landed on October 4, 2026 and October 8, 2026 respectively.

Scorecard4 real differences Β· 2 level
Comtrade Viewer versus otsora: the parameters behind the verdict, then further details
ParameterComtrade Viewerotsora
PriceFreeFree
Update frequencyFortnightly β€” betterEvery 4 months
AdsNoNo
In-app purchasesNo β€” betterYes
DevicesiPhone, iPad, iPod β€” betteriPhone
Requires iOS15.0 β€” better18.6
Further details β€” not scored
Size4 MB2 MB
Age rating4+4+
DeveloperRussell Pattersonsirajuddin sirajuddin

In-app purchases

None

Comtrade Viewer

No in-app purchases

1 purchases

otsora

Subscriptions1
  • cable pro7 Days trial$12.001 Month

Questions

Is Comtrade Viewer free?
Comtrade Viewer is free to download, with no in-app purchases.
Is otsora free?
otsora is free to download, with in-app purchases available.
Do Comtrade Viewer or otsora have ads?
Neither Comtrade Viewer nor otsora shows ads.
Which is updated more often, Comtrade Viewer or otsora?
Comtrade Viewer ships an update fortnightly, and otsora every 4 months. Most recently, Comtrade Viewer was updated on October 4, 2026 and otsora on October 8, 2026.

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