Slide Rule vs OnefuncPlan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Slide Rule
Simulates a mechanical analog computer for scientific and engineering calculations. Perform multiplication, division, roots, and trigonometric functions with a digital slide rule.
- Multiplication and division
- Square and cube roots
- Trigonometry functions
- Logarithm calculations
- Digital slide rule simulation
- Mechanical analog computer
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This app is a slide rule simulator. The slide rule (a.k.a. slipstick) is an mechanical analog computer which was formerly used for various scientific calculations, engineering design and surveying. It consists of three linear strips and a sliding cursor and is used for multiplication, division, square, cube, square root, cubic root, trigonometry, logarithm and so on. Please note that trigonometry and logarithm are not supported and the width of the scale is 1,000 pixels in this version.
OnefuncPlan
This app helps you gain insights into your daily actions and routines. It offers task management, workload tracking, and stress monitoring, with AI-powered analysis based on Volitional Motion Theory. Share schedules with others and access your data across multiple devices.
- Quick task and idea capture
- Schedule and task management tools
- AI-powered workload and stress monitoring
- Shared schedules with commenting
- Cross-device data synchronization
- Optional location for weather
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OnefuncPlan turns your daily actions into clear, usable insights. You can start using the app instantly—no email required. All calculations and AI processing are performed locally on your device. Key Features Quick Entry Capture tasks and ideas instantly, without breaking your flow. Essential Tools All the core features you need for schedule and task management. AI Support Powered by Volitional Motion Theory (VMT), the app monitors your daily tasks, keeps track of your workload and stress, and helps you notice small changes in your routine. Shared Schedules Share plans with family or colleagues and exchange comments seamlessly. Also available on macOS, Windows, and the web. Data syncs automatically across all your devices. Notes on Permissions This app temporarily uses location to provide weather information. Location is only used to provide weather info and is optional. By default, your general area is determined from your IP address. The app may optionally add birthdays from your contacts. No other contact information is accessed. Paid Features The app offers two subscription plans that unlock additional features and greater convenience. Basic Plan: 1. Full-text search for past events 2. Unlimited number of undated event notes and favorite events 3. Ability to reorder the main menu 4. Remove restrictions on automatic event color settings 5. Unlimited creation of shared spaces (previously limited to 2) 6. Increase the maximum characters for monthly notes from 3,000 to 6,000 7. Ability to copy Masterpiece data 8. Edit event menus (iOS only) 9. Add detailed options for activity measurement methods 10. Full access to "Structure Tags" in Analysis 11. Show "wits" (Will Momentum) on the Main screen Basic Plan is an auto-renewing subscription. Premium Plan: 1. All Basic features available. 2. Scheduled coordination: Member limit increased from 3 to 33 3. Shared Spaces: Max members increased from 2 to 33 4. Shared Spaces: Max follows increased from 2 to 20 4. Status Screen: Simultaneous user display increased from 3 to 20 5. Extended comment retention for shared events (up to 1 year) 6. Masterpiece: Max task image attachments increased from 1 to 3 Premium Plan is an auto-renewing subscription. Subscription Information Paid plans are auto-renewing subscriptions (monthly or yearly). Payment will be charged to your iTunes account. You can manage auto-renewal in your iTunes account settings and turn it off after purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. According to the iTunes Store’s In-App Subscription Terms and Onefunc’s Terms of Service, paid subscriptions are non-refundable, except where required by law. If you purchase a subscription during a free trial, any unused portion of the free trial will be forfeited. Privacy Policy: https://onefunc.com/privacypolicy/ Terms of Service: https://onefunc.com/termsofservice/
Screenshots
Verdict
The clearest difference is price: OnefuncPlan at Free against Slide Rule's $0.99. OnefuncPlan also leads on rating (4.0 vs 1.0) and update cadence (every 4 days vs every 29 months). Slide Rule's advantage is in-app purchases (none vs 14) and review sentiment (75% vs 67%). On ads 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
OnefuncPlan is free to download; Slide Rule costs $0.99 up front. OnefuncPlan sells 13 in-app purchases, starting at $2.99 per month. Slide Rule asks for nothing beyond the download.
OnefuncPlan holds the better App Store score, 4.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews complicate that: 75% of Slide Rule's written reviews are positive against 67% of OnefuncPlan's, so the app with the better star average is not the one people write more warmly about.
Slide Rule ships an update every 29 months, OnefuncPlan every 4 days. The most recent releases landed on September 21, 2026 and September 19, 2026 respectively.
| Parameter | Slide Rule | OnefuncPlan |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 1.0 (1 ratings) | 4.0 (3 ratings) — better |
| Positive reviews | 75.0% of reviews — better | 66.7% of reviews |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 29 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Freemium — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 35 MB |
| Age rating | 4+ | 17+ |
| Developer | Masayuki Akamatsu | Masaru Kondo |
Customer experience
Slide Rule
OnefuncPlan
In-app purchases
Slide Rule
No in-app purchases
OnefuncPlan
- Basic(1 month)$2.991 Month
- Pro (1 month)$2.991 Month
- 3 mons. & special free trial7 Days trial$8.493 Months
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- Premium (1 month)$9.991 Month
- Premium (3 months)$13.993 Months
- Premium (6 months)$25.996 Months
- Basic(1 year)$29.991 Year
- Pro (1 year)$29.991 Year
- Premium (1 year) + α$46.991 Year
- Premium (1 year)$99.991 Year
- OnetimePremium$0.99
- Premium service (one month)2 variants$4.99
- Onefunc Plan Advance$15.99









