Comparison

Brownout vs Postfach

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

Head to head
About

Brownout

Easily check Japan's electricity demand forecast across 10 regions. View actual demand, forecasts, and supply capacity with clear daily line charts. Stay informed about the power situation from Hokkaido to Okinawa.

Highlights
  • Electricity demand forecasts for 10 Japanese regions
  • Actual demand, forecast, and supply capacity charts
  • Real-time usage rate display
  • Easy region switching
  • Data from regional power companies
Features
Read full description

"Brownout" is an iOS app that lets you easily check the electricity demand forecast (Denki Yoho) for 10 regions across Japan. View each region's actual demand, forecast, and supply capacity as a daily line chart. Simply switch between regions to instantly check the power situation anywhere from Hokkaido to Okinawa. [Features] โ€ข Displays electricity demand forecasts for all 10 regions of Japan โ€ข View actual demand, forecast, and supply capacity in easy-to-read line charts โ€ข Shows real-time usage rate โ€ข Region switching [Supported Regions] Hokkaido / Tohoku / Tokyo / Chubu / Hokuriku / Kansai / Chugoku / Shikoku / Kyushu / Okinawa Data is fetched from the Denki Yoho CSV files published by each regional power company.

About

Postfach

Features
Read full description

We run no servers, so there is nothing of yours on one. A call from our hosting provider started it. They asked whether one of our important addresses had anything to do with a big cloud company โ€” it didn't. It turned out the mail app we were using was routing through that company to deliver push notifications. We had tried nearly every mail app by then and were never quite happy, so we built our own. Here is why that call mattered. To push a notification for an ordinary IMAP account, an app has to keep your password โ€” or a token that opens the same door โ€” on its own server, and watch your mailbox from there. Postfach never does this. Your password stays in your Keychain, and new mail is announced by your own device once it has fetched it: on the Mac within seconds while the app is running, on the iPhone whenever iOS grants a check in the background. Instant push is the one thing we gave up, and that is why. WHAT IT DOES - Any IMAP account: Zimbra, Gmail, and the rest. Zimbra servers are found from the address alone. - Write, reply, forward, and send, with attachments. - All Inboxes: one list over every account, newest first, with each message acting on its own account. - Conversations, with replies from every folder gathered under the message you are looking at. - Every message kept on your device in full, so reading works offline and search finds words anywhere in years of mail in a fraction of a second. - Templates with placeholders for the replies you write again and again. - Folders: create, rename, move, and delete them, on the server. - Swipe to delete, flag, mark as junk, or archive. - New-mail notifications from your own device, once it has fetched, per account, and the unread count on the icon. - HTML mail rendered with scripts off and remote images blocked until you ask for them. - Light and dark appearance. English, German, French, Italian, Spanish, and Japanese. WHAT IT DOES NOT DO No analytics, no crash reporting, no advertising identifier, nothing measured and sent anywhere. No AI: no summaries, no smart replies, no sorted inbox, and no model of ours or anyone else's sees a word of your mail. No account with us, because there is nothing to have an account for. That is why the privacy label reads "Data Not Collected", and why there is no setting to turn any of it off: none of it is there. PRICING Every feature is free for 60 days. After that, sending and receiving mail need a single purchase, Postfach Pro โ€” one price for your Mac, iPhone, and iPad, no subscription. Mail already on your device stays readable and searchable whether you buy or not.

Screenshots

Brownout3 screens
Postfach4 screens

Verdict

The call

The clearest difference is in-app purchases: Brownout at none against Postfach's 1. Postfach's advantage is update cadence (every 2 days vs every 3 weeks) and iOS requirement (18.0 vs 26.0). On price, ads and device support 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. Postfach sells 1 one-off in-app purchase. Brownout asks for nothing beyond the download.

UpkeepUpdate frequency

Brownout ships an update every 3 weeks, Postfach every 2 days. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

Scorecard3 real differences ยท 5 level
Brownout versus Postfach: the parameters behind the verdict, then further details
ParameterBrownoutPostfach
PriceFreeFree
Positive reviews0.0% of reviewsโ€”
Update frequencyEvery 3 weeksEvery 2 days โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
MonetizationFreeโ€”
DevicesiPhone, iPadiPhone, iPad, Mac โ€” better
Requires iOS26.018.0 โ€” better
Further details โ€” not scored
Size1 MB22 MB
Age rating4+4+
DeveloperBitzesense GmbH

In-app purchases

None

Brownout

No in-app purchases

1 purchases

Postfach

One-time1
  • Postfach Pro$22.99

Questions

Is Brownout free?
Brownout is free to download, with no in-app purchases.
Is Postfach free?
Postfach is free to download, with in-app purchases available.
Do Brownout or Postfach have ads?
Neither Brownout nor Postfach shows ads.
Which is updated more often, Brownout or Postfach?
Brownout ships an update every 3 weeks, and Postfach every 2 days. Most recently, Brownout was updated on November 1, 2026 and Postfach on November 6, 2026.

Other comparisons