Comparison

Self vs postin

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Self

Features
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Self-Control Mate is a habit tracker and supportive community for people working toward better routines, stronger focus, and lasting self-control. Changing a habit can be difficult when you do it alone. Self-Control Mate helps you track your progress, celebrate small wins, and stay connected with people working toward similar goals. This is more than a streak counter. It is a place to share progress, learn from other people's experiences, and keep moving forward. Two main features: 1. A supportive community for personal goals - Share progress, challenges, wins, motivation, and daily reflections - Encourage each other with likes and comments - Learn practical ideas from people pursuing similar goals - Report inappropriate posts and block users when needed The community is moderated under clear guidelines to help keep discussions safe and constructive. 2. A counter that makes your effort visible - See your current streak at a glance - Track progress toward your personal habit goals - Restart anytime and keep learning from your journey Self-Control Mate is for people who: - Want to change a habit but find it difficult to stay consistent - Want to build focus, self-control, and a more productive daily life - Want a simple habit counter or streak tracker - Want encouragement from people with similar goals Small steps add up. Start with Self-Control Mate today and take the next step toward better habits.

About

postin

Features
Read full description

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

Self4 screens
postin4 screens

Verdict

The call

The clearest difference is in-app purchases: Self at none against postin's 3. Self also leads on device support (3 vs 1) and iOS requirement (15.0 vs 26.0). postin's advantage is update cadence (every 2 days vs every 2 weeks). On price and ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. postin sells 3 in-app purchases, starting at $1.99 per month. Self asks for nothing beyond the download.

UpkeepUpdate frequency

Self ships an update every 2 weeks, postin every 2 days. The most recent releases landed on October 16, 2026 and September 29, 2026 respectively.

Scorecard4 real differences · 2 level
Self versus postin: the parameters behind the verdict, then further details
ParameterSelfpostin
PriceFreeFree
Update frequencyEvery 2 weeksEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better26.0
Further details — not scored
Size84 MB47 MB
Age rating17+4+
DeveloperYuki Shimazukeishi yokoi

In-app purchases

None

Self

No in-app purchases

3 purchases

postin

Subscriptions2
  • Subscription Plan (Monthly)$1.991 Month
  • Annual Subscription$19.991 Year
One-time1
  • 5 Stamps$0.29

Questions

Is Self free?
Self is free to download, with no in-app purchases.
Is postin free?
postin is free to download, with in-app purchases available.
Do Self or postin have ads?
Neither Self nor postin shows ads.
Which is updated more often, Self or postin?
Self ships an update every 2 weeks, and postin every 2 days. Most recently, Self was updated on October 16, 2026 and postin on September 29, 2026.

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