Downloading a bengali poem app should take two minutes, but people still get it wrong. Here is the short, correct guide for Android and iOS.
On Android, use the Play Store and check three things: the developer name, the review count, and the permissions. A poetry app asking for your contacts and location is a red flag the size of Dhaka.
On iOS, the App Store is stricter, which helps, but still check the screenshots. If the screenshots show blurry text or broken Bangla rendering, the app itself will too. Screenshots do not lie about typography.
Bangla font rendering is the technical gotcha. Some apps display conjunct characters incorrectly, turning beautiful words into boxes or broken shapes. Open a poem with complex conjuncts before you commit to any app.
Storage is the other check. Poetry apps should be small. If a simple poem collection wants 200 MB, something is wrong. Text is light; only audio libraries justify real size.
For low-end phones, which is most of the actual audience, prefer apps that explicitly support older Android versions. The fanciest app in the world is useless on the phone people actually own.
Once installed, do the two-minute test: find a Tagore poem, check the spelling, try offline mode, share one card. If all four work, keep it. If any fail, there is always kobitaghar.com in your browser as the reliable backup.