40IP vs Procrastitask
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
40IP
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40 Inventive Principles in one app. Speed up your idea generation process using the 40 Inventive Principles from the TRIZ toolbox. The theory of inventive problem solving, developed by Genrich Altshuller, offers a plethora of tools for generating innovative ideas to solve inventive problems. The 40 Inventive Principles are probably the best-known tool for taking the broader view when working on a task. 40IP contains the 40 Inventive Principles, explained by more than 400 illustrated examples, bundled as a compact reference for every situation. Use it to resolve technical as well as physical contradictions and take advantage of a wide variety of suggestions to increase your idea output. Features: - 40 Inventive Principles - 400+ illustrated examples - Engineering Contradiction (Altshuller Matrix, Matrix 2003) - Physical Contradiction
Procrastitask
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Some reminders are too important to swipe away and forget. Procrastitask is built for exactly those. A normal reminder buzzes once and gives up. A Procrastitask reminder escalates: a gentle heads-up, then a firmer nudge, then - for the things you truly can't miss - a full-screen breakthrough alarm that cuts through silent mode and Focus. It stays loud until you deal with it, then gets out of your way. THE ESCALATION LADDER - Heads-up before it's due, so nothing sneaks up on you. - Nudges that get more insistent the longer something sits. - A breakthrough alarm for must-not-miss tasks - a real alarm, not a notification you'll scroll past. - Quiet hours you control, so it's loud when it should be and silent when it shouldn't. SHARED ACCOUNTABILITY Reminders are easy to ignore when it's just you. Share a space with a partner, roommate, or teammate and keep each other on the hook: assign a task, and when it's done - or missed - the other person knows. Every assignment is a request until you accept it, so no one can pile obligations on you without your say-so. BUILT FOR THE WAY YOU ACTUALLY WORK - Add reminders in plain language ("trash out every Tuesday at 8", "call mom tomorrow"). - Recurring tasks that roll forward correctly, across timezones. - A clean two-tab home: your tasks, and what you share. - Designed for iPhone, light and dark. YOUR AI AGENT CAN DRIVE IT Procrastitask is agent-native: connect your own AI assistant and let it create, check, and complete your reminders through a secure, own-tasks-only connection. You mint the access, you revoke it. PRIVATE BY DESIGN No ads. No third-party trackers. We don't sell your data. Delete your account and everything goes with it - including revoking Sign in with Apple. Procrastitask is a productivity app, not an emergency or life-safety system - notification and alarm delivery depend on your device and settings. Terms of Use (EULA): https://api.procrastitask.app/terms Privacy Policy: https://api.procrastitask.app/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: 40IP at none against Procrastitask's 3. 40IP also leads on iOS requirement (15.0 vs 26.0). Procrastitask's advantage is update cadence (every 3 weeks vs every 18 months). On price, 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
Both are free to download. Procrastitask sells 3 in-app purchases, starting at $4.99 per month. 40IP asks for nothing beyond the download.
40IP ships an update every 18 months, Procrastitask every 3 weeks. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.
| Parameter | 40IP | Procrastitask |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 18 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 81 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | TRIZ Consulting Group GmbH | Jason A Flatford |
In-app purchases
40IP
No in-app purchases
Procrastitask
- Monthly Pro$4.991 Month
- Annual Pro$29.991 Year
- Founder Lifetime$49.99









