Comparison

Etalvis vs Backflow Tester Exam Prep

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

Head to head
About

Etalvis

Features
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Etalvis is a unique LEARNING PLATFORM that is based on Self Learning, Self Assessment and Self Reliance. The courses on this app focus primarily on Electronics Foundations, and are meant to help students from any background. Sample Course Topics: 1. Electronics Foundation Course 2. C-Programming Foundation Course 3. Embedded Hardware Foundation Course 4. Embedded Software Foundation Course 5. ARM Foundation Course 5. Microprocessor Internals Course 6. Networking Foundation Course and many more...

About

Backflow Tester Exam Prep

Features
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BACKFLOW TESTER EXAM PREP: PASS YOUR CERTIFICATION. NEVER FAIL A TEST. The only mobile app with a full test procedure simulator for DC, RPZ, PVB, and SVB assemblies. Most candidates fail the practical because they know the theory but freeze on the exact test sequence. Wrong step order means a failed assembly test. This app fixes that. TEST PROCEDURE SIMULATOR Step-by-step walkthrough for every assembly type. Checkbox each sub-step, enter your PSID readings, get instant pass/fail feedback. Common mistakes highlighted at each step. Animated assembly diagrams show hose connections and test c**k positions. Double Check Valve (DC): two-check testing sequence, minimum 1.0 PSID for each check, return to service procedure. Reduced Pressure Zone (RPZ): all five test steps in order, relief valve opening point test, Check 1 minimum 5.0 PSID, relief must open within 2.0 PSID below Check 1. Pressure Vacuum Breaker (PVB): check valve test, air inlet opening point, backsiphonage protection verification. Spill-Resistant Vacuum Breaker (SVB): complete sequence with pass/fail criteria. DIFFERENTIAL PRESSURE CALCULATOR Enter high-side and low-side gauge readings. Instant PSID with automatic pass/fail against all assembly minimums. DC checks need 1.0 PSID. RPZ Check 1 needs 5.0 PSID. Know instantly before moving to the next step. ASSEMBLY PARTS IDENTIFIER Tap any component on the interactive diagram: test c**k locations 1 through 4, check valve positions, relief valve on RPZ, shutoff valve locations, hose connection points. Quiz mode tests parts identification โ€” heavily tested on both written and practical sections. 350+ PRACTICE QUESTIONS TEST PROCEDURES: Step sequences, correct order of operations, what to do when a check fails, when to declare an assembly failed. ASSEMBLY COMPONENTS: Parts by name and function, test c**k numbering, check and relief valve operation. CROSS-CONNECTION THEORY: Backpressure vs backsiphonage, hazard assessment (high vs low hazard), when to specify DC vs RPZ vs PVB vs air gap, cross-connection control program requirements. DIFFERENTIAL PRESSURE: PSID calculations from gauge readings, minimum requirements by assembly type, gauge operation and calibration. REPAIR AND TROUBLESHOOTING: Failed check identification, relief valve replacement, disc and seat inspection, when to condemn an assembly. REGULATIONS: ABPA, AWWA, USC FCCC standards, annual testing requirements, test report completion, permit requirements by jurisdiction. FREE: 5 questions per day, DC simulator demo (first 3 steps), PSID calculator. No account required. MONTHLY ($9.99/month): Full simulator for all 4 assemblies, unlimited questions, all tools, 3-day free trial. ANNUAL ($24.99/year): Save over 75 percent. Best value. LIFETIME ($39.99): One payment. Permanent access. PASS PROMISE: Complete all questions with 80% or higher average, hold active subscription for 3 months, still do not pass. We extend your access by 4 months at no charge. voltexam.com/pass-promise For educational purposes only. Always follow your certifying organization procedures and local water authority regulations. Not affiliated with ABPA, AWWA, USC FCCC, or IAPMO. Privacy Policy: https://www.voltexam.com/privacy Terms of Service: https://www.voltexam.com/terms

Screenshots

Etalvis4 screens
Backflow Tester Exam Prep4 screens

Verdict

The call

The clearest difference is iOS requirement: Etalvis at 15.1 against Backflow Tester Exam Prep's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Etalvis sells 1 one-off in-app purchase and Backflow Tester Exam Prep sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Etalvis ships an update every 4 months, Backflow Tester Exam Prep every 3 months. The most recent releases landed on October 18, 2026 and October 7, 2026 respectively.

Scorecard1 real difference ยท 5 level
Etalvis versus Backflow Tester Exam Prep: the parameters behind the verdict, then further details
ParameterEtalvisBackflow Tester Exam Prep
PriceFreeFree
Update frequencyEvery 4 monthsEvery 3 months โ€” better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPod โ€” betteriPhone
Requires iOS15.1 โ€” better17.0
Further details โ€” not scored
Size52 MB6 MB
Age rating4+4+
DeveloperTagMango IncDeeun Inc.

In-app purchases

1 purchases

Etalvis

One-time1
  • The Learning Journey$14.99
3 purchases

Backflow Tester Exam Prep

Subscriptions2
  • Backflow Tester Pro - Monthly3 Days trial$9.991 Month
  • Annual Access$24.991 Year
One-time1
  • Pro - Lifetime Access$39.99

Questions

Is Etalvis free?
Etalvis is free to download, with in-app purchases available.
Is Backflow Tester Exam Prep free?
Backflow Tester Exam Prep is free to download, with in-app purchases available.
Do Etalvis or Backflow Tester Exam Prep have ads?
Neither Etalvis nor Backflow Tester Exam Prep shows ads.
Which is updated more often, Etalvis or Backflow Tester Exam Prep?
Etalvis ships an update every 4 months, and Backflow Tester Exam Prep every 3 months. Most recently, Etalvis was updated on October 18, 2026 and Backflow Tester Exam Prep on October 7, 2026.

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