Comparison

BlitzRechner vs Sun Hours for Solar Panels

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

Head to head
About

BlitzRechner

Visually track approaching thunderstorms by timing lightning and thunder. Measure storm distance using your iPhone or Apple Watch. Review past measurements and compare data with saved entries and notes.

Highlights
  • Visual storm distance tracking
  • Lightning and thunder timing
  • iPhone and Apple Watch support
  • Review saved measurements
  • Compare storm data
  • Add notes to measurements
Features
Read full description

Eine App, die Visuell darstellt wie weit das nächste Gewitter entfernt ist. Durch das tippen beim sehen eines Blitzes und beim erneuten Tippen wenn Sie ein Donner hören kann die App die Entfernung zum Gewitter messen. Sobald ein Gewitter auftritt kannst du diese App nutzen um mit Hilfe deines iPhones oder Apple Watch herauszufinden wie weit dieses entfernt ist. Willst du jede Messung nochmal überprüfen oder die Werte mit Anderen vergleichen? Auch das stellt kein Problem da! Schau einfach mal zu deinen Gespeicherten Elementen rein und mache dir auch Notizen Viel Spaß

About

Sun Hours for Solar Panels

Get a quick solar generation forecast for your UK home or portable panels. See hourly and daily predictions, optimize appliance usage with smart timers, and receive alerts for peak solar windows. Works with any UK solar setup without inverter login.

Highlights
  • 8-second solar generation forecast
  • Hourly and 7-day generation curves
  • 30-day historical weather view
  • Personalized daily forecast alerts
  • Smart appliance scheduling
  • Portable panel forecasting (Travel Mode)
  • Works with all UK solar setups
Features
Read full description

Will your panels generate anything today? Sun Hours tells you in 8 seconds — just your ZIP/postal code or map pin and your best-ever solar day. No inverter login. No azimuth. No account. No engineering degree. THE FORECAST Today's expected kWh before your coffee is ready. An hour-by-hour generation curve shows exactly when your panels peak. Get a 7-day solar forecast with cloud cover and efficiency for each day, plus a 30-day view built from historical weather at your exact location — so you understand your site's full seasonal rhythm, not just this week. SOL Every morning, Sol — Sun Hours' pixel-art sun mascot — delivers a personal forecast for your panels before you've touched a chart. When today's forecast matches your all-time best generation day, Sol sends a notification: "It's a 100% day." The solar equivalent of a perfect score. SUN HOURS ALERTS Optional morning notifications tell you the day's best two-hour solar window. "Best window today: 11 AM–1 PM." Charge the EV, run the dishwasher, or power another appliance with your own free electricity instead of the grid. SMART APPLIANCE TIMER Tell Sun Hours which appliances you use. It tells you exactly when to run each one during your solar peak. Washer, dishwasher, dryer, EV top-up — scheduled around your free generation, not your habits. TRAVEL MODE Portable panels on an RV? Camping with a folding kit? Drop a pin anywhere or use GPS to get a solar forecast for that exact location. One tap takes you back to your home setup. WORKS WITH EVERYTHING Hoymiles, Deye, Marstek, Envertech, APS, Solis, Growatt — and every other rooftop or plug-in setup. No inverter integration needed. If it generates kWh, Sun Hours can forecast it. ON IPAD AND MAC The dashboard opens out into two columns on iPad, so today and the week ahead sit side by side rather than stacked, with the animated sky running edge to edge behind a frosted glass toolbar. The forecast accuracy grid uses the extra width and labels each month. It runs on an M-series Mac too. Free to use. Infrequent, closable ads. No account. No tracking. Your location never leaves your device. Built in the UK for solar owners everywhere — by someone who got tired of apps making a simple question complicated. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sunhours.app/privacy

Screenshots

BlitzRechner4 screens
Sun Hours for Solar Panels4 screens

Verdict

The call

The clearest difference is review sentiment: Sun Hours for Solar Panels at 86% against BlitzRechner's 0%. Sun Hours for Solar Panels also leads on update cadence (every 6 days vs every 6 weeks) and device support (4 vs 2). BlitzRechner's advantage is ads (none vs shown). On price, in-app purchases and monetization model 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. BlitzRechner sells 3 one-off in-app purchases and Sun Hours for Solar Panels sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

BlitzRechner ships an update every 6 weeks, Sun Hours for Solar Panels every 6 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

Scorecard5 real differences · 5 level
BlitzRechner versus Sun Hours for Solar Panels: the parameters behind the verdict, then further details
ParameterBlitzRechnerSun Hours for Solar Panels
PriceFreeFree
Rating—4.0 (3 ratings) — better
Positive reviews0.0% of reviews85.7% of reviews — better
Number of ratings—3 — better
Update frequencyEvery 6 weeksEvery 6 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, Apple WatchiPhone, iPad, iPod, Apple Watch — better
Requires iOS17.615.0 — better
Further details — not scored
Size2 MB55 MB
Age rating4+4+
DeveloperChristopher FuchsAndy Mesa

Customer experience

BlitzRechner

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Sun Hours for Solar Panels

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews7 reviews
Positive85.7%
Neutral0.0%
Negative14.3%

In-app purchases

3 purchases

BlitzRechner

One-time3
  • Brötchen$1.99
  • Pommes$3.99
  • Döner$6.99
3 purchases

Sun Hours for Solar Panels

Subscriptions1
  • Sun Hours Pro Monthly7 Days trial$0.991 Month
One-time2
  • No Ads - Lifetime$0.99
  • Sun Hours Pro - Lifetime$5.99

Questions

Is BlitzRechner free?
BlitzRechner is free to download, with in-app purchases available.
Is Sun Hours for Solar Panels free?
Sun Hours for Solar Panels is free to download, with in-app purchases available.
Do BlitzRechner or Sun Hours for Solar Panels have ads?
Sun Hours for Solar Panels shows ads; BlitzRechner does not.
Which is updated more often, BlitzRechner or Sun Hours for Solar Panels?
BlitzRechner ships an update every 6 weeks, and Sun Hours for Solar Panels every 6 days. Most recently, BlitzRechner was updated on November 3, 2026 and Sun Hours for Solar Panels on November 5, 2026.

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