SIEVES vs Lock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SIEVES
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Productivity tracker
Lock
This app helps users focus on tasks using timed study sessions, fostering accountability through shared progress and group grinding. It aims to transform screen time into productive output.
- Pomodoro study sessions
- Group study grinding
- Progress sharing
- Accountability features
- Screen time to productivity conversion
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Lock-in is a social study app built around Pomodoro sessions. Start a focus session, grind together with others, share your progress, and stay accountable. Turn screen time into real productivity.
Screenshots
Verdict
The clearest difference is update cadence: SIEVES at weekly against Lock's every 2 weeks. On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
SIEVES ships an update weekly, Lock every 2 weeks. Both last shipped on October 30, 2026.
| Parameter | SIEVES | Lock |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Weekly — better | Every 2 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 43 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | Sidikov Ibrokhim | Azizbek Zaylobiddinov |
In-app purchases
SIEVES
No in-app purchases
Lock
No in-app purchases
