Comparison

Boat Units vs SolarMark

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

Head to head
About

Boat Units

Features
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Boat Units gives sailors quick, reliable access to the conversions they use every day — from speed and distance to electrical, environmental, and onboard measurements. Designed for cruising sailors who want fast answers without digging through menus. Whether you’re checking wind speed, converting nautical miles, or working out electrical loads, everything is laid out for quick reference on the water. FEATURES Conversions tailored for sailors and yacht owners Nautical, environmental, electrical, length, and distance units Clean, simple interface built for quick use underway No ads, no clutter, no unnecessary categories DEVELOPMENT Boat Units is under active development, with new conversions and improvements planned. Feedback from sailors is always welcome and helps shape future releases.

About

SolarMark

Monitor your solar power generation and battery storage systems locally and privately. Visualize real-time energy flow, get intelligent predictions, and receive protection alerts without relying on cloud services.

Highlights
  • Direct Modbus TCP polling
  • Live power flow dashboard
  • Multi-device infrastructure management
  • Localized weather-based generation predictions
  • On-device analytics ledger
  • Open data export (CSV)
  • Protection alerts (no-generation, performance, thermal)
Features
Read full description

Take complete local control of your green energy infrastructure with SolarMark—the ultimate privacy-focused telemetry engine designed explicitly for solar power generation and battery storage systems. Unlike standard cloud platforms that lock your history behind proprietary servers, SolarMark establishes a direct, secure line to your hardware using local Modbus TCP polling. No third-party accounts, no remote data centers, and zero internet tracking dependencies required. REAL-TIME ECOSYSTEM MONITORING • Direct Modbus TCP Polling: Pull telemetry straight from your inverters and battery systems every 5 seconds. • Live Power Flow Dashboard: Instantly visualize generation metrics, grid imports, grid exports, and real-time utility currency valuation flows. • Multi-Device Infrastructure: Seamlessly configure and manage multiple independent inverters and standalone battery installations. INTELLIGENT PREDICTIONS & ANALYTICS • Localized Weather Gating: Synchronize system coordinates with local Open-Meteo irradiance data to generate automated daily generation predictions. • SQLite Analytics Ledger: Securely store lifetime energy metrics, battery state-of-charge curves, performance tracking, and voltage anomalies directly on your device. • Open Data Freedom: Extract energy histories and localized telemetry logs at any time using filtered, uncompressed CSV schema layers. SELF-CALIBRATING PROTECTION ALERTS • No-Generation Alarms: Receive automated system warnings if your hardware fails to initialize or generate power during standard daylight profiles. • Performance Threshold Vetting: SolarMark dynamically maps 30 days of production data to calibrate and alert you if real-time sunlight conversion loops drop below 40% efficiency. • Battery Thermal Shielding: Three independent detection layers monitor and instantly alert you of uncharacteristic voltage shifts or active thermal volatility spikes. FINANCIAL & ENVIRONMENTAL CLEARANCE • Track absolute localized financial tracking metrics with an integrated multi-currency picker (£ $ € ¥ A$ C$). • Toggle your sustainability output dashboards dynamically between metric tons of CO₂ offset or real-time equivalent trees planted. Keep your home data inside your local network. Secure your infrastructure, maximize your grid efficiency index, and download SolarMark today!

Screenshots

Boat Units4 screens
SolarMark4 screens

Verdict

The call

The clearest difference is update cadence: Boat Units at every 3 days against SolarMark's monthly. SolarMark's advantage is iOS requirement (15.1 vs 18.6). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Boat Units ships an update every 3 days, SolarMark monthly. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.

Scorecard2 real differences · 8 level
Boat Units versus SolarMark: the parameters behind the verdict, then further details
ParameterBoat UnitsSolarMark
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 3 days — betterMonthly
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.615.1 — better
Further details — not scored
Size7 MB55 MB
Age rating4+4+
DeveloperMarcus JohanssonSolarMark Software LLC

In-app purchases

None

Boat Units

No in-app purchases

None

SolarMark

No in-app purchases

Questions

Is Boat Units free?
Boat Units is free to download, with no in-app purchases.
Is SolarMark free?
SolarMark is free to download, with no in-app purchases.
Do Boat Units or SolarMark have ads?
Neither Boat Units nor SolarMark shows ads.
Which is updated more often, Boat Units or SolarMark?
Boat Units ships an update every 3 days, and SolarMark monthly. Most recently, Boat Units was updated on October 12, 2026 and SolarMark on October 6, 2026.

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