Comparison

RAID Calc2 vs Simple Mind Tree

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

Head to head
About

RAID Calc2

Features
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RAID Calc2 is retiring. It leaves the App Store on December 31, 2026. It keeps working on your device after that, but won’t get updates. Its successor is RAID Calculator, from the same developer. It’s the same calculator, plus NAS planning for Synology SHR, Unraid, ZFS, SnapRAID and Btrfs, RAID 50 and 60, and RAID-Z. Search the App Store for “RAID Calculator”, or tap the banner in the app. UNTIL THEN, RAID CALC2 STILL DOES THE JOB • RAID 0, 1, 5, 6, 10 and JBOD • Usable and raw capacity, and how efficient the layout is • What the space will show as in TiB, the binary units most systems report • A drive strip showing which drives hold data, parity or mirrors • How many drive failures the array survives • Speed and availability ratings, with a plain-language guide to every level • A caution before a risky rebuild on large drives, with a one-tap switch to RAID 6 • One-tap fixes when the drive count doesn’t suit the level ON EVERY SCREEN • On iPad, and on iPhone Duo opened in landscape, results sit beside inputs • Rotates to landscape on iPhone • Built for iOS 26 with native controls and Liquid Glass • Dark mode, Dynamic Type at every size, and full VoiceOver support • In English, Spanish, French, Italian, Japanese, German, Traditional and Simplified Chinese, Korean and Brazilian Portuguese PRIVATE No accounts, no tracking, no ads. Everything stays on your device. Not affiliated with or endorsed by Synology Inc. Synology and SHR are trademarks of Synology Inc. Not affiliated with or endorsed by Lime Technology, Inc. Unraid is a trademark of Lime Technology, Inc. ZFS is a trademark of Oracle and/or its affiliates. Not affiliated with or endorsed by Oracle.

About

Simple Mind Tree

Features
Read full description

Brainstorm anytime, anywhere — whether you're organizing your thoughts or seeking creative ideas in a meeting.

Screenshots

RAID Calc23 screens
Simple Mind Tree4 screens

Verdict

The call

The clearest difference is update cadence: Simple Mind Tree at weekly against RAID Calc2's every 5 months. Simple Mind Tree also leads on iOS requirement (15.1 vs 26.0). 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

RAID Calc2 ships an update every 5 months, Simple Mind Tree weekly. The most recent releases landed on October 16, 2026 and October 5, 2026 respectively.

Scorecard2 real differences · 4 level
RAID Calc2 versus Simple Mind Tree: the parameters behind the verdict, then further details
ParameterRAID Calc2Simple Mind Tree
PriceFreeFree
Update frequencyEvery 5 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.015.1 — better
Further details — not scored
Size7 MB30 MB
Age rating12+4+
DeveloperTodd GrecoCheonsoo Park

In-app purchases

None

RAID Calc2

No in-app purchases

None

Simple Mind Tree

No in-app purchases

Questions

Is RAID Calc2 free?
RAID Calc2 is free to download, with no in-app purchases.
Is Simple Mind Tree free?
Simple Mind Tree is free to download, with no in-app purchases.
Do RAID Calc2 or Simple Mind Tree have ads?
Neither RAID Calc2 nor Simple Mind Tree shows ads.
Which is updated more often, RAID Calc2 or Simple Mind Tree?
RAID Calc2 ships an update every 5 months, and Simple Mind Tree weekly. Most recently, RAID Calc2 was updated on October 16, 2026 and Simple Mind Tree on October 5, 2026.

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