Keepstone vs Time Capsule
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Keepstone
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Keepstone is a private journal for memories you want to preserve, seal, and rediscover later. Write a memory, add photos or voice notes, lock it until a future date, or create a letter to your future self. Your journal stays local on your device: no account, no cloud sync, no social feed. WRITE Capture daily thoughts, meaningful moments, photos, and voice notes in a calm writing space. SEAL Lock memories until a future date. Create personal time capsules or letters to your future self. ORGANIZE Use tags, search, themes, typography, and journal statistics to shape your archive over time. EXPORT Create password-protected .kstone files, encrypted backups, and PDF exports for unlocked memories. PRIVATE BY DESIGN Your data stays local on your device. Keepstone does not require an account to write, seal, import, export, or read your memories. SUPPORTER Keepstone includes an optional one-time Supporter upgrade for premium themes, typography, full journal statistics, and PDF export. Keepstone is built for memory, privacy, and time.
Time Capsule
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Send a message to your future self or loved ones. Time Capsule lets you create meaningful messages that unlock at a specific date and time in the future. Whether it's a reminder, a promise, or words of encouragement, preserve your thoughts and feelings for tomorrow. KEY FEATURES: - Schedule messages for any future date and time - Send capsules to friends and family - Beautiful, intuitive interface - Secure and private - your messages are encrypted - Get notified when capsules are ready to open - Share memories and moments across time PERFECT FOR: - Birthday wishes sent months in advance - New Year's resolutions to open next year - Anniversary messages for loved ones - Future reminders to yourself - Preserving special moments Download Time Capsule today and start creating memories for tomorrow.
Screenshots
Verdict
The clearest difference is in-app purchases: Time Capsule at none against Keepstone's 1. Time Capsule also leads on iOS requirement (13.0 vs 15.0). Keepstone's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Keepstone sells 1 one-off in-app purchase. Time Capsule asks for nothing beyond the download.
Keepstone ships an update every 6 days, Time Capsule every 3 days. The most recent releases landed on October 9, 2026 and October 6, 2026 respectively.
| Parameter | Keepstone | Time Capsule |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 days | Every 3 days โ better |
| Ads | No โ better | Yes |
| In-app purchases | Yes | No โ better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 โ better |
| Further details โ not scored | ||
| Size | 18 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Pablo Silva | Subin Jo |
In-app purchases
Keepstone
- Keepstone Supporter$0.99
Time Capsule
No in-app purchases








