Rule of Three Calculator
v2.0.9 · 14.6 MB · code 109
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File information
UpdatedMar 27, 2026
PublishedMar 27, 2026
Packagecom.aplicaciones.gastry.regladetres
Versionv2.0.9 (109)
Size14.6 MB
MD513018759cca7fc37c1b65d74c7431f4e
Min SDK24
ABIsx86, x86-64, armeabi-v7a, arm64-v8a
Malware scanTRUSTED
Signature SHA1EA:FC:E5:39:27:6C:CF:C5:2E:E9:93:16:70:2C:00:75:A5:FA:98:96
SignerCN=Juan Mauricio Piano Monz?, L=Sollana, ST=Valencia, C=ES
Total downloads50,000
This version50,000
DeveloperGastry
Age ratingEveryone
What's new in v2.0.9
Added a new Settings screen.
Privacy options are now in Settings.
Added the option to remove ads with a one-time purchase.
Improved history loading and overall stability.
Privacy options are now in Settings.
Added the option to remove ads with a one-time purchase.
Improved history loading and overall stability.
Security scan
TRUSTED
- Developer signature verified 2026-03-27
- Signature SHA1 EA:FC:E5:39:27:6C:CF:C5:2E:E9:93:16:70:2C:00:75:A5:FA:98:96
- File MD5 13018759cca7fc37c1b65d74c7431f4e
How to install Rule of Three Calculator v2.0.9 on Android 7.0 Nougat+
Takes about 2 minutes. You'll need roughly 14.6 MB of free storage.
- Grab com.aplicaciones.gastry.regladetres_109.apk — hit the Download button above (14.6 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches 13018759cca7fc37…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find com.aplicaciones.gastry.regladetres_109.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Juan Mauricio Piano Monz?, L=Sollana, ST=Valencia, C=ES. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open Rule of Three Calculator — tap Open on the install screen, or find the Rule of Three Calculator icon in your app drawer (this build targets x86/x86-64/armeabi-v7a/arm64-v8a devices).
Common install errors for Rule of Three Calculator
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android 7.0 Nougat or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.
- Works on one phone but not another — this build ships x86/x86-64/armeabi-v7a/arm64-v8a native code. Devices with a different CPU will reject it.