RAID Calc2 vs Simple Mind Tree
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RAID Calc2
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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.
Simple Mind Tree
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Brainstorm anytime, anywhere — whether you're organizing your thoughts or seeking creative ideas in a meeting.
Screenshots
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
| Parameter | RAID Calc2 | Simple Mind Tree |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 7 MB | 30 MB |
| Age rating | 12+ | 4+ |
| Developer | Todd Greco | Cheonsoo Park |
In-app purchases
RAID Calc2
No in-app purchases
Simple Mind Tree
No in-app purchases
Questions
Is RAID Calc2 free?
Is Simple Mind Tree free?
Do RAID Calc2 or Simple Mind Tree have ads?
Which is updated more often, RAID Calc2 or Simple Mind Tree?
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