Calclin vs Lock In
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calclin
This calculator app provides a paper-roll style history for easy review of calculations. It supports formula input, notes for results, and multiple calculation frames to organize different tasks. Users can customize display modes and appearance.
- Paper-roll style calculation history
- Multiple calculation frames
- Formula input with parentheses and functions
- Notes for calculation results
- PDF export
- Customizable digit grouping, separators, and rounding
- Auto, Light, and Dark appearance modes
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A calculator memo app with history that keeps your calculation process visible like a paper roll. Switch between calculator input and formula input to handle everything from everyday math to calculations you want to keep as records. ■ Calculator mode and Formula mode Calculator mode evaluates left to right (5+5×2=20). Formula mode respects operator precedence (5+5×2=15) and supports parentheses and roots. Switch anytime from the input row, changing the calculation style without leaving the active input area. ■ Paper-roll style history Expressions and answers stay on the roll from the top, so you can see the flow of your calculation at a glance. Subtle side lines and top shading keep each frame easy to distinguish, even with multiple rolls. In calculator mode, a running total can be shown while you type. ■ Edit rows and add notes In calculator mode, tap any roll row to edit and recalculate. Add a note to any history entry. Swipe left to delete; swipe right to add a memo, copy the expression, or copy the answer. ■ PDF export Export a calculation roll as a PDF whenever you want to keep it. ■ Use multiple calculators side by side Up to a triple deck. Add or remove panels with the [+][−] header buttons, swipe or tap to switch, and double-tap to toggle between 1-panel and 2-panel views. ■ Unit-aware calculations Calculate with units of length, area, volume, and weight. ■ Customizable keyboard Long-press any key to define it, and merge keys vertically or horizontally to create larger keys. Switch between 5 layouts (30 keys each), and export or import your arrangement. ■ Flexible display settings Choose the decimal point and grouping symbols, the grouping style (every 3 or 4 digits, Indian style), the number of decimal digits, and the rounding mode (including round half to even). Pick Auto, Light, or Dark appearance, and enlarge or reduce text size. Your settings are restored on next launch. ■ Beginner and Expert modes Beginner mode shows labels and tips for each button. Once you are comfortable, Expert mode unlocks advanced operations such as long-press key editing. The calculation engine uses C/C++ fixed-point decimal, stored internally in BCD arrays. Note: Data is not encrypted. Please do not store personal or confidential information.
Lock In
This app helps you break phone addiction by disabling selected apps during focused sessions. You can set durations, create schedules, and take scheduled breaks. Friends can help you end sessions early, and emergency unlocks are available.
- Disable selected apps for set durations
- Create weekly app usage schedules
- Scheduled breaks with daily limits
- Friend-assisted session unlocking
- Emergency unlock option
- App uninstall protection
- Set daily app usage limits
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Reduce your screen time with the help of your friends. Lock in empowers you to break phone addiction by disabling selected apps during focused sessions. Core Features (Subscription Required): • Select apps to be disabled for a set duration or create weekly schedules. • Take breaks: 3x 1-minute and 2x 15-minute breaks available daily. • End sessions early only by: • Requesting a subscribed friend to unlock you. • Using an emergency unlock (1 free; more can be purchased (consumable)). • App uninstall protection during lock sessions. • Set daily app usage limits (e.g. 1h of Instagram, Snapchat). • To extend a limit, record yourself reading a preset message aloud and post it on the Wall of Shame. Auto-Renewable Subscriptions: All subscriptions auto-renew unless canceled at least 24 hours before the end of the current period. You can manage or cancel your subscription anytime via your App Store account settings. Available Plans: • Member Friends (Annual): Full access to all features. Also includes 1 free coupon to gift a “Member Solo (Annual)” subscription to a friend. Duration: 1 Year – Renews annually. • Member Solo (Annual): Full access to all features. Duration: 1 Year – Renews annually. • Member (Monthly): Full access to all features. Duration: 1 Month – Renews monthly. Prices vary by region and will be shown before purchase. Additional Purchases: • Additional emergency unlocks can be purchased in-app. Privacy Policy: https://getlockinapp.com/privacy-policy Terms of Use: https://getlockinapp.com/terms-of-service https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: Lock In at 5.0 against Calclin's 2.0. Lock In also leads on update cadence (every 3 days vs monthly). Calclin's advantage is monetization model (free vs subscription). On price, review sentiment, ratings volume 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. Calclin sells 2 one-off in-app purchases and Lock In sells 4 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
Lock In holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 50% and 50% positive.
Calclin ships an update monthly, Lock In every 3 days. The most recent releases landed on July 18, 2026 and September 9, 2026 respectively.
| Parameter | Calclin | Lock In |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (1 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Monthly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free — better | Subscription |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 127 MB |
| Age rating | 4+ | 4+ |
| Developer | Azukid.com | Georg Ye |
Customer experience
Calclin
Lock In
In-app purchases
Calclin
- Tips_1$0.99
- Tips_5$4.99
Lock In
- Solo Membership (Monthly)7 Days trial$2.991 Month
- Solo Membership (Annually)7 Days trial$19.991 Year
- Friends Membership (Annually)7 Days trial$24.991 Year
- Emergency Unlock$4.99









