iSolar vs Solar Calibrator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iSolar
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Are you realizing a solar plant but you don't know how to direct your panel? No more problems with iSolar! iSolar allows you to calculate the best orientation for your photovoltaic panels according to the season.
Solar Calibrator
This professional toolkit helps PV installers precisely calibrate panel angles, size battery banks and wire gauges, and generate PDF quotes. It includes tools for obstruction analysis and load auditing, all accessible offline.
- Solar compass and tilt angle calibration
- Battery and inverter sizing
- Wire gauge calculation
- Load audit and quote builder
- PV array and string sizing
- Obstruction analysis
- Offline functionality
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The Professional Solar Installer's Toolkit Solar Calibrator is the all-in-one pocket utility for PV installers, engineers, and advanced DIYers. Calibrate panel angles with precision, size battery banks, calculate wire gauges, and generate professional PDF quotes—all without internet access. CORE TOOLS: Solar Compass & Tilt: Align panels to True North/South and find the optimal tilt angle for Summer or Winter efficiency. Uses advanced sensor damping for steady, professional readings. Battery & Inverter Sizing: Calculate exact off-grid storage needs based on load. Supports Lithium (LiFePO4) and Lead-Acid profiles. Wire Gauge Calculator: Prevent voltage drop and fire hazards. Calculates safe wire thickness (AWG/mm²) based on voltage, current, and run length. Load Audit & Quote Builder: Build a complete appliance load profile and generate instant PDF estimates to share with clients. PV Array & String Sizing: Determine the maximum number of panels per string based on local temperature lows (Voc limits) to protect your inverter. Obstruction Analysis: Calculate shadow cast distance to ensure your array stays shade-free during winter solstice. NEW IN V2.0: Field Mode UI: High-contrast Dark Mode for visibility in bright sunlight. PDF Reports: Export detailed calculation reports and client quotes. Smart Location: Auto-detects latitude for precise sun-hour estimations.
Screenshots
Verdict
The clearest difference is price: iSolar at $0.99 against Solar Calibrator's $9.99. iSolar also leads on update cadence (fortnightly vs every 11 months). Solar Calibrator's advantage is ads (none vs shown) and iOS requirement (15.1 vs 18.0). On 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
iSolar costs $0.99 and Solar Calibrator $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
iSolar ships an update fortnightly, Solar Calibrator every 11 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | iSolar | Solar Calibrator |
|---|---|---|
| Price | $0.99 — better | $9.99 |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Fortnightly — better | Every 11 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 18.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 9 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Alain Lima | Fawzi Fakhro |
In-app purchases
iSolar
No in-app purchases
Solar Calibrator
No in-app purchases
