Comtrade Viewer vs otsora
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Comtrade Viewer
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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.
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-routeβ¦) 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
Verdict
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
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.
Comtrade Viewer ships an update fortnightly, otsora every 4 months. The most recent releases landed on October 4, 2026 and October 8, 2026 respectively.
| Parameter | Comtrade Viewer | otsora |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly β better | Every 4 months |
| Ads | No | No |
| In-app purchases | No β better | Yes |
| Devices | iPhone, iPad, iPod β better | iPhone |
| Requires iOS | 15.0 β better | 18.6 |
| Further details β not scored | ||
| Size | 4 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Russell Patterson | sirajuddin sirajuddin |
In-app purchases
Comtrade Viewer
No in-app purchases
otsora
- cable pro7 Days trial$12.001 Month
Questions
Is Comtrade Viewer free?
Is otsora free?
Do Comtrade Viewer or otsora have ads?
Which is updated more often, Comtrade Viewer or otsora?
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