Coteka vs Solo Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Coteka
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The simple way for two people to track shared expenses and settle up. Coteka is a shared-expense app for couples, partners, roommates, and any two people who manage money together. Just add what you paid, and Coteka automatically keeps your balance up to date—so you always know who should pay whom, without spreadsheets or awkward reminders. ■ Perfect if you… • Share living costs with a partner or roommate • Cover dates, trips, groceries, or other costs and settle up later • Lose track of who has been paying more • Are tired of tracking shared expenses in chats or notes ■ Features • Quick entry: add an amount and note, then choose who paid and how to split it • Automatic balance: always see who should pay whom and how much • Flexible splits: split equally, by income ratio, or assign the full cost to one person • Individual adjustments: fine-tune each person's share for personal items or uneven expenses • Calendar view: see monthly spending and recently added entries at a glance • Graph view: see monthly spending, category breakdowns, and recurring costs at a glance • Recurring expenses: automatically track rent, utilities, subscriptions, and other regular costs • Notifications: stay updated on payment and settlement changes, recurring expense settings, and upcoming entries • Settlement history: record the amount and date whenever you settle up • Free to use, with ads shown in supported parts of the app ■ Start in seconds • No account setup or login required—open the app and start right away • Begin on your own, then invite your partner with a link when you're ready ■ Made for the world • Supports multiple languages and currencies • Light and dark mode Stop asking “wait, who paid for that?”—settle up the simple way with Coteka.
Solo Diary
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Solo Diary replaces the habit of opening social media with a timeline that's only yours. ■ No one can see it No followers, no public posts, no like counts. What you write here is yours alone. Instead of comparing yourself to others, you face only your past self. ■ Instead of likes, a word from an AI When you post, an AI leaves a short comment. Choose from three personalities — Empathetic, Witty, or Matter-of-fact. AI comments are optional; every feature still works with them off. When on, only your note's text is sent to generate a comment. Photos are never sent. ■ Your past self, returning "A month ago / a year ago today" surfaces at the top of your timeline, so you can gently reread how you felt back then. ■ Quiet by design A dark theme. No red notification badges, and no endless scroll — a finite timeline you can actually finish. ■ In your language Available in English, Japanese, Chinese, Korean, and Spanish. The app follows your device language, and the AI replies in your language too. No account needed. Your data stays on your device and can be deleted anytime. Free to use (ads support the AI feature). Prefer no ads? A one-time "Remove ads" purchase hides them all.
Screenshots
Verdict
Coteka and Solo Diary are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
Coteka ships an update every 3 weeks, Solo Diary every 6 weeks. The most recent releases landed on October 10, 2026 and October 13, 2026 respectively.
| Parameter | Coteka | Solo Diary |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks — better | Every 6 weeks |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 44 MB | 28 MB |
| Age rating | 4+ | 12+ |
| Developer | Chamshot, Inc. | Sae Ueno |
In-app purchases
Coteka
No in-app purchases
Solo Diary
No in-app purchases









