WriteBack vs postin
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WriteBack
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Express yourself in the most authentic and therapeutic way, using letters! WriteBack is a new way to get in touch with your friends and family. 1. Make a scribble for what’s in your heart and save it as a journal. 2. Share your thoughts with your loved ones as a personal letter. 3. Track the responses and write back again. 4. Send the letters to your contacts. 5. All the letters are privately shared and not public. Letters can be seen only by the recipient, you choose! 6. Save the letters in one place, and track their corresponding responses in one place. Just like email threads, WriteBack makes a thread of letters so you can find them easily! Enjoy writing!
postin
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A little love, in a postcard. “Thank you for today.” “I can’t wait to see you again.” With postin, turn your favorite photos and a few heartfelt words into a digital postcard for the person you love. Share it through LINE. Your partner can open it in their browser—no app download or account needed. After a date. On a day you wish you could be together. For a birthday or anniversary. Give them a little something to open, smile at, and cherish. ■ Make it yours Add a photo, write a message, and decorate your postcard with handwriting, drawings, and stickers. A stamp is already in place, so you can start creating right away. You can swap it for another one, too. ■ Share through LINE Create a link to your postcard and send it through LINE. Your partner simply opens the link to view the card in their browser—even if they don’t use postin. ■ Open now, or save the surprise Let your partner open the card right away, or choose the date and time it becomes available. Make it a surprise for midnight on their birthday or the morning of your anniversary. Note: Scheduling sets when the postcard can be opened. It does not automatically send a LINE message. Please share the link with your partner in advance. ■ Try your first postcard Create and send a postcard in the tutorial without using a stamp. Start with a photo you love and something you’ve been meaning to say. ■ Stamps and subscriptions Regular postcard sending and share-link creation use stamps. Additional stamps are available through in-app purchases. An optional subscription includes unlimited sending, subscriber-exclusive stationery, and desk backgrounds. Receiving and viewing postcards is free. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours before the current period ends. You can manage or cancel your subscription in your App Store account settings. See the in-app purchase screen for pricing and subscription periods. Terms of Service: https://honey-cucumber-463.notion.site/postin-3adcc260b87780bc9705ff7010973037
Screenshots
Verdict
The clearest difference is in-app purchases: WriteBack at none against postin's 3. WriteBack also leads on iOS requirement (13.0 vs 26.0). postin's advantage is update cadence (every 2 days vs every 5 days). On price, ads 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. postin sells 3 in-app purchases, starting at $1.99 per month. WriteBack asks for nothing beyond the download.
WriteBack ships an update every 5 days, postin every 2 days. The most recent releases landed on September 25, 2026 and September 29, 2026 respectively.
| Parameter | WriteBack | postin |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 days | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 18 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Markovate | keishi yokoi |
In-app purchases
WriteBack
No in-app purchases
postin
- Subscription Plan (Monthly)$1.991 Month
- Annual Subscription$19.991 Year
- 5 Stamps$0.29









