Comparison

Iridium GO! vs RackWatt

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

Head to head
About

Iridium GO!

Connect your iPhone or iPad to a global satellite network for calls, texts, and social media updates anywhere on Earth. This app provides essential communication capabilities even in areas without terrestrial network coverage, including emergency SOS functionality.

Highlights
  • Satellite calling
  • SMS messaging
  • Twitter integration
  • Emergency SOS activation
  • Global network coverage
  • Wi-Fi connectivity
Read full description

Iridium GO! enables satellite connectivity for your iPhone/iPad where terrestrial networks are non-existent, unreliable, or costly. With Iridium GO! and the power of the Iridium global satellite network, your iPhone/iPad will now work anywhere on the planet. The Iridium GO! app enables users to connect over Wi-Fi and make phone calls, send SMS, post Twitter updates, or activate SOS in the event of an emergency (requires registration). Visit www.iridiumgo.com for Iridium GO! product details and information on where to buy. The Iridium GO! app supports English, Spanish, French, Russian, and Japanese languages. Note: The Iridium GO! device is required to use this app.

About

RackWatt

This offline toolkit digitizes data center procedures, offering step-by-step execution with timestamps, notes, photos, and signatures. It includes comprehensive calculators for power and cooling, troubleshooting guides for equipment, and document management for operations and maintenance.

Highlights
  • Offline procedure execution
  • Digital signatures and PDF export
  • Power and cooling calculators
  • Equipment troubleshooting guides
  • Document management
  • Safety and uptime features
Features
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RackWatt is a fully offline field toolkit for data center critical facilities technicians, operations engineers, and commissioning agents. Data halls are radio hostile and access controlled, so everything works with zero connectivity. THE METHOD OF PROCEDURE, DIGITIZED The core of RackWatt is procedure execution. Build or import a Method of Procedure, then execute it step by step. Initial every line, capture an automatic timestamp, add notes, photos, and readings, and finish with technician, peer reviewer, and manager signatures. Export a signed PDF record ready for the operations file. Pre execution guardrails confirm authorization, risk level, the current redundancy state, and the back out plan before any critical work begins. Pause or abort with a reason, and get a hard prompt to execute the back out plan. CALCULATORS THAT SHOW THEIR WORK A full power and cooling suite: UPS battery runtime, UPS sizing and loading, generator fuel runtime, three phase power, rack power density, power usage effectiveness, redundancy modeling for N, N plus 1, 2N, and 2N plus 1, arc flash awareness, airflow and heat load, delta T targets, airflow by density, and refrigeration. Every result shows the formula, the source, and the intermediate steps. EQUIPMENT TROUBLESHOOTING AND REFERENCE Searchable, offline reference across UPS, generators and transfer, electrical distribution, air cooling, monitoring, and the underserved liquid cooling edge: cold plates, manifolds, Coolant Distribution Units, rear door heat exchangers, and the hard won detail that mechanical seal life scales with discharge pressure. Every entry gives the warning signs and then an ordered list of what to check, most likely cause first. A UPS on bypass leads with the fact that the critical load is unprotected right now, even though it is still up. A generator that starts and then shuts down is kept separate from a no start, because fuel, battery and cranking are already proven and the diagnosis goes somewhere else entirely. Guided decision trees walk you through utility loss, unit on battery or bypass, breaker trips, high inlet temperature, cooling failures, abnormal delta T, leak alarms, and alarm storm triage, with red stops on safety critical steps. DOCUMENTS AND COMMISSIONING Standard and Emergency Operating Procedure libraries, commissioning levels one through five, rounds and readings with out of range flagging, preventive maintenance by asset class, work orders, incident and near miss reports, lockout tagout and energized work permits, arc flash and PPE assessments, and the change and risk record. Route any document to preset recipients. Emails queue and send when connectivity returns. SAFETY AND UPTIME DISCIPLINE Emergency power off, NFPA 70E awareness, and the discipline of never breaking redundancy without an approved procedure and a known back out plan. PRIVACY BY DESIGN No account, no cloud, no analytics, no ads, no third party SDK. Your procedures, records, and documents stay on device. RACKWATT PRO Free: the reference library, the three phase and delta T calculators, and signed records. Pro unlocks the other calculators, decision trees, redundancy model and procedures. $9.99 monthly or $79.99 yearly. The yearly plan starts with a 7 day free trial for first time subscribers; any unused part of the trial is forfeited if you subscribe during it. Payment is charged at confirmation, or when the trial ends, and renews automatically unless cancelled 24 hours before the period ends. Manage or cancel in Apple account settings. RackWatt is a field aid, not a substitute for the site approved procedures, the manufacturer manuals, NFPA 70E, the site arc flash study, or the engineer of record. Calculations are estimates to be verified by a qualified person. Privacy Policy: https://thrasherapps.com/rackwatt/privacy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ RackWatt Terms: https://thrasherapps.com/rackwatt/terms.html

Screenshots

Iridium GO!4 screens
RackWatt4 screens

Verdict

The call

The clearest difference is review sentiment: RackWatt at 100% against Iridium GO!'s 7%. RackWatt also leads on rating (5.0 vs 1.9) and update cadence (every 11 days vs every 5 months). Iridium GO!'s advantage is in-app purchases (none vs 2) and ratings volume (58 vs 1). On price, ads and device support there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. RackWatt sells 2 in-app purchases, starting at $9.99 per month. Iridium GO! asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

RackWatt holds the better App Store score, 5.0 against 1.9. That said, the two scores are not equally well evidenced: Iridium GO! has 58 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 7% of Iridium GO!'s written reviews are positive against 100% of RackWatt's.

UpkeepUpdate frequency

Iridium GO! ships an update every 5 months, RackWatt every 11 days. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

Scorecard7 real differences · 3 level
Iridium GO! versus RackWatt: the parameters behind the verdict, then further details
ParameterIridium GO!RackWatt
PriceFreeFree
Rating1.9 (58 ratings)5.0 (1 ratings) — better
Positive reviews6.8% of reviews100.0% of reviews — better
Number of ratings58 — better1
Update frequencyEvery 5 monthsEvery 11 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better17.6
Further details — not scored
Size67 MB2 MB
Age rating4+4+
DeveloperIridiumChris Thrasher

Customer experience

Iridium GO!

All ratings54 ratings
Positive20.4%
Neutral1.9%
Negative77.8%
Written reviews74 reviews
Positive6.8%
Neutral6.8%
Negative86.5%

RackWatt

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Iridium GO!

No in-app purchases

2 purchases

RackWatt

Subscriptions2
  • RackWatt Pro Monthly$9.991 Month
  • RackWatt7 Days trial$79.991 Year

Questions

Is Iridium GO! free?
Iridium GO! is free to download, with no in-app purchases.
Is RackWatt free?
RackWatt is free to download, with in-app purchases available.
Which has better reviews, Iridium GO! or RackWatt?
RackWatt is rated higher. Iridium GO! averages 1.9 out of 5 from 58 ratings, while RackWatt averages 5.0 from 1 ratings.
Do Iridium GO! or RackWatt have ads?
Neither Iridium GO! nor RackWatt shows ads.
Which is updated more often, Iridium GO! or RackWatt?
Iridium GO! ships an update every 5 months, and RackWatt every 11 days. Most recently, Iridium GO! was updated on October 24, 2026 and RackWatt on October 31, 2026.

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