Oz Optimizer vs Left
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Oz Optimizer
This app helps you optimize your financial plan and track your progress in real-time. It provides tools to manage your finances effectively and stay on top of your financial goals.
- Financial plan optimization
- Real-time progress tracking
- Cash flow management
- Financial goal monitoring
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Oz optimizes your financial plan and helps you track your progress in real-time.
Left
This app simplifies daily budgeting by focusing on a single number: what's left to spend after setting aside essential bills. It offers a minimalist approach to personal finance, ideal for those overwhelmed by complex budgeting tools.
- Single daily spending number
- Envelope for big bills
- Customizable spending periods
- Minimalist interface
- No bank syncing
- No categories
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One number tells you what's left to spend today. One envelope holds the big bills — rent, subs, loans. That's it. — — — Left. is a daily budget tracker for people who tried YNAB and gave up, tried spreadsheets and got bored on day three, tried mental math and lost track on day one. It works on a single, honest idea: pour everything you have into a period, set aside the big bills into an envelope, and what remains is yours to spend, divided by days. One screen. One number. No charts. No categories. No streaks, no badges, no nudges. Nothing to maintain. When you need to dip into the reserve — hold the envelope. The envelope breaks open. You take what you need. It seals back. — — — How it works: 01 Pick a period — a month, a week, three days, a trip. 02 Pour in the amount — everything you have for that period. 03 Set the envelope aside — the big bills that have to wait. 04 See what's left — one number on the home screen, every day. — — — What's not in here: — No syncing with banks. — No machine learning categorisation. — No social feed of how friends spend. — No subscription, no upsell, no premium tier. What is in here: — A blank page that opens on a number. — A reserve sealed in an envelope, opened with a long press. — A ledger that remembers every tap. — One hand. One thumb. One number a day. — — — Left. by Koodalabs
Screenshots
Verdict
The clearest difference is ratings volume: Oz Optimizer at 21 against Left's 1. Oz Optimizer also leads on iOS requirement (16.0 vs 18.0). On price, rating, update cadence 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Oz Optimizer against 5.0 for Left. That said, the two scores are not equally well evidenced: Oz Optimizer has 21 ratings behind it against 1, so its average is the more settled of the two.
Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 8, 2026 and September 24, 2026 respectively.
| Parameter | Oz Optimizer | Left |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (21 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 21 — better | 1 |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 16.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 26 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Oz Optimizer, Inc. | Koodalabs LLC |
Customer experience
Oz Optimizer
Left
In-app purchases
Oz Optimizer
No in-app purchases
Left
No in-app purchases
