500 Life vs ReadPDB
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
500 Life
This app encourages regular Bible study through a structured approach to the Life-study of the Bible. It offers customizable reading schedules, progress tracking, and offline access to study messages for spiritual nourishment and growth.
- Customizable reading schedules
- Offline access to study messages
- Progress visualization and milestone badges
- Integration with ministrybooks.org
- Habitual spiritual nourishment
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The 500 Life-studies (500LS) app aims to help and encourage believers to become constituted with the truth in the Bible by using the Life-study of the Bible in a regular and habitual way. The Life-study of the Bible, a monumental and classic work by Witness Lee, is a book-by-book exposition of the entire Bible from the perspective of the believers’ enjoyment of Christ as life for the building up of the church as the Body of Christ. The "500" refers to the goal of reading at least 500 Life-study messages for your spiritual nourishment and growth. FEATURES: Customizable schedules: Create one or more reading schedules that can accommodate your reading capacity and time. Consider starting small to achieve better consistency. Easy access to the Life-study messages: Access your reading directly in the app via a simple reader without the need for Internet connection or via integration with ministrybooks.org (available for free or with a paid subscription). Progress visualization: Track both your overall progress and recent progress as you work toward your goals and earn milestone badges along the way. If you have any questions or feedback or want to report a bug, please contact us on https://500lifestudies.canny.io. For additional resources and information, please visit https://500lifestudies.org.
ReadPDB
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Bring your Palm-era ebook library back to life. ReadPDB opens compatible, non-DRM iSilo 3 and PalmDOC ebook documents stored as Palm Database (.pdb) files. Import books directly from the Files app and read them on your iPhone or iPad—no account required. Reading is offline. Features • Import one or more compatible .pdb books from the Files app • Filter your library by book title • Render supported text formatting and internal links • Automatically return to your last reading position • Adjust text size for comfortable reading • Choose Light, Dark, or System appearance • Navigate with Back, Forward, and Home controls • Highlight passages for later reference • Share selected text using the standard iOS share sheet • Remove imported books from your library at any time • Contact us from Settings • Optional lifetime ReadPDB Pro for unlimited imports after three free books Offline reading ReadPDB has no accounts, subscriptions, advertising, or tracking. Your books remain on your device and are never uploaded. Optional ReadPDB Pro is a one-time in-app purchase processed by Apple. Purchase status is recorded with RevenueCat so the unlock can be restored. The bundled sample does not count toward the three-book free library. Compatibility ReadPDB currently supports compatible, non-DRM iSilo 3 documents and PalmDOC-family documents (including TealDoc and AportisDoc). The .pdb extension was shared by many Palm OS applications, so other .pdb files may use formats that ReadPDB cannot open. The following are not currently supported: • Password- or registration-protected books • MOBI and other Palm Database variants • Damaged or corrupted files • Unrelated files that also use the .pdb extension • PDF documents • Embedded images within documents ReadPDB does not include, sell, or download books. Import only documents that you own or have permission to use.
Screenshots
Verdict
The clearest difference is update cadence: ReadPDB at daily against 500 Life's every 3 months. 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.
500 Life ships an update every 3 months, ReadPDB daily. The most recent releases landed on October 16, 2026 and October 4, 2026 respectively.
| Parameter | 500 Life | ReadPDB |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (118 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 118 — better | — |
| Update frequency | Every 3 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 176 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Living Stream Ministry | Jaime Martin Lozano |
In-app purchases
500 Life
No in-app purchases
ReadPDB
No in-app purchases









