Unit Converter Engineering Pro vs Solar Pump
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Unit Converter Engineering Pro
This app provides precise unit conversions for engineers, scientists, and students. It supports over 100 units across 35 categories, including scientific notation and 9-digit decimal precision. The tool works offline and adheres to SI, NIST, and ISO standards.
- Over 100 units in 35+ categories
- Scientific notation support
- 9-digit decimal precision
- SI, NIST, ISO compliant
- Offline functionality
- Specialized units included
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Unit Converter Engineering Pro – The ultimate tool for engineers, scientists, and students who need precise and fast unit conversions. Easily convert between over 100 units across more than 35 categories commonly used in engineering, physics, chemistry, and mathematics. Perfect for professionals, researchers, and students who want a reliable, professional-grade converter at their fingertips. Included categories: • Acceleration • Angle • Area • Specific Heat • Electric Charge • Heat Transfer Coefficient • Length • Concentration • Thermal Conductivity • Physical Constants • Density • Diffusivity • Energy • Heat Flux • Force • Illuminance • Luminance • Mass • Moment / Torque • Power • ppm / ppb / ppt / % • SI Prefix • Pressure • Radiation – Activity • Radiation – Dose • Radiation – Exposure • Radiation – Equivalent Dose • Time • Volume • Velocity / Speed • Viscosity • Volume Flow Rate • Voltage / Electric Potential • Frequency • Temperature Key Features: • Supports scientific notation for extreme precision • Fully compliant with SI, NIST, and ISO standards • 9-digit decimal precision for engineering-grade accuracy • Fast and intuitive interface • Works offline – no internet required • Includes rare and specialized units often missing from other converters • Made by engineers, for engineers Simplify your work, save time, and ensure accuracy with Unit Converter Engineering Pro - your professional unit conversion companion. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Solar Pump
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Solar Pump sizes battery-less solar pumping systems (direct to tank), built for the field. Tell it how much water you need and the head, and it computes the solar array size and the pump class — no need to know panels or electricity. WORKS OFFLINE All the math is local. No signal, no data needed — use it at the well, on the farm, anywhere. WHAT IT COMPUTES • The solar array needed (Wp / kW) • Suggested pump power in kW and HP • Design flow and pipe velocity • Total dynamic head (TDH) from your pipe and static head • The suggested pump class for your duty point • Daily system energy SIZED FOR THE WORST MONTH The system is sized on the peak sun hours of your region's lowest-radiation month, so it delivers water year-round — even in the cloudiest season. ESTIMATE YOUR WATER DEMAND Not sure of your m³/day? The app estimates it for you: • Livestock: dairy and beef cattle, pigs, poultry, sheep and goats, and more • Crops: by area and irrigation method (drip, sprinkler, furrow) Or enter the daily volume directly. 21 COUNTRIES, 3 LANGUAGES Available across all of Latin America plus Brazil, Australia and the United States — 21 countries, each with its region's real solar resource (NASA POWER, 20-year climatology). Switch between English, Spanish and Portuguese anytime. ADVANCED SETTINGS Fine-tune the pump-and-motor efficiency, array losses (derate) and well drawdown to match your case. Solar Pump, by Transparent Blue Water. For preliminary sizing: always verify results with engineering judgment.
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Verdict
The clearest difference is in-app purchases: Solar Pump at none against Unit Converter Engineering Pro's 2. Unit Converter Engineering Pro's advantage is iOS requirement (13.0 vs 15.1). On price, update cadence, 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
Both are free to download. Unit Converter Engineering Pro sells 2 in-app purchases, starting at $5.99 per 7 days. Solar Pump asks for nothing beyond the download.
Unit Converter Engineering Pro ships an update weekly, Solar Pump every 4 days. The most recent releases landed on September 15, 2026 and September 3, 2026 respectively.
| Parameter | Unit Converter Engineering Pro | Solar Pump |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Weekly | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 77 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Kaiguri Tech | Transparent Blue Water LLC |
In-app purchases
Unit Converter Engineering Pro
- 3-Day Trial3 Days trial$5.997 Days
- Yearly Plan$19.991 Year
Solar Pump
No in-app purchases





