Comparison

4DI vs FirstSeed Planner

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

4DI

Features
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4DI is an offline reference tool for data integrity in regulated environments — built for QA, validation, manufacturing, and laboratory teams working under GxP. The app organizes data integrity knowledge into five areas: ALCOA++ principles, regulatory frameworks, the data lifecycle, typical inspection findings, and a glossary. ALCOA++ PRINCIPLES 10 principles, each with a clear definition and practical examples contrasting good practice with a typical violation: - Attributable - Legible - Contemporaneous - Original - Accurate - Complete - Consistent - Enduring - Available - Traceable (added per the EMA guideline on computerised systems and electronic data in clinical trials, 2023) REGULATORY FRAMEWORKS 7 frameworks side by side, each with a summary, core requirements, and a link to the official source: - FDA 21 CFR Part 11 - EU GMP Annex 11 - MHRA GxP Data Integrity Guidance - EMA Guideline on computerised systems and electronic data in clinical trials (2023) - PIC/S PI 041 - WHO TRS 1033, Annex 4 — Guideline on data integrity (2021) - ICH Q7 Frameworks are tagged by region (US / EU / International). A comparison view highlights key differences across four topics: audit trail, electronic signatures, risk-based approach, and quality culture & human factors. DATA LIFECYCLE Six phases — Creation, Processing, Review & Approval, Reporting, Retention, Archival & Destruction — each mapped to its relevant ALCOA++ principles, typical pitfalls, and regulatory focus. INSPECTION FINDINGS 17 findings modeled on public patterns from FDA Warning Letters, Form 483 observations, and EU GMP non-conformities. Organized by category and severity, each finding lists the principles violated, its regulatory basis, and remediation measures, with links to official databases. Full search included. GLOSSARY 29 terms — ALCOA terms, regulatory abbreviations (CFR, GMP, GLP, GCP...), technical terms (audit trail, metadata, electronic signature), and quality terms (CAPA, deviation, OOS) — each with a definition and context. Bookmark terms for quick access, get a "term of the day," and search even without typing accents. FIVE LANGUAGES 4DI speaks English, German, French, Spanish and Italian. A new installation starts in your iPhone's language when 4DI supports it. You can switch the language any time in the app's Settings. BUILT FOR OFFLINE USE Light, dark, or system appearance. Works entirely offline: no accounts, no tracking, no ads, no permissions required. Bookmarks stay on your device. COMMUNITY & SUPPORT Report a bug, suggest a feature, or flag a content correction through the app's Settings — linked to robspace's public GitHub hub for discussion. For direct support: support@robspace.de. DISCLAIMER: 4DI is a privately developed helping tool. It is not endorsed, certified, or validated by any regulatory authority. Content is for informational purposes only and must not replace official regulatory guidance or professional advice.

About

FirstSeed Planner

Organize your day with a single-page view of your calendar, notes, and to-do list. Seamlessly integrate existing calendars and add photos or formatted text to your notes. Unfinished tasks can be carried over to the next day.

Highlights
  • Single-page daily view
  • Integrates with existing calendars
  • Add photos and formatted notes
  • Carry over unfinished tasks
  • Search across events, notes, and reminders
  • Export to PDF and Markdown
  • Customizable display options
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Your events, to-dos, and notes for each day, together on one page. Each page shows your calendar, events, and notes together, so you can see your schedule while you write. Events and reminders come straight from the Calendar and Reminders apps on your device. Add photos, create to-dos with checkboxes, and move unfinished items to another day. One day, one page See your schedule and notes together. Adjust the space for each, search across events, reminders, and notes, and swipe between days. Works with your calendars Use your existing iCloud, Google, and Exchange calendars with no importing required. Create, reorder, and share calendars right in the app. Notes and to-dos Add photos, checkboxes, lists, highlights, and text formatting. Use each page as a planner, journal, meeting notes, health log, or anything else you need. Stay on top of unfinished tasks See overdue reminders and unfinished to-dos in one place and move them to today or tomorrow with a single action. Made for larger screens Use a two-column layout or open a two-day spread. Eight widgets let you see events, notes, to-dos, and your month at a glance. Export and customize Export pages as PDF or Markdown, with support for A4, A5, B5, and US Letter. Customize colors, text size, weekends, holidays, and more. FirstSeed Planner Pro - Sync across iPhone, iPad, and Mac - Automatic iCloud backup - Weather on your pages - Quick Access menu - App icon badge About Subscription: Payment will be charged to your Apple ID account at the confirmation of purchase. Subscription automatically renews unless it is canceled 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. You can manage and cancel your subscriptions by going to your account settings on the App Store after purchase. Terms of Use: https://firstseed.io/terms.html

Screenshots

4DI4 screens
FirstSeed Planner4 screens

Verdict

The call

The clearest difference is in-app purchases: 4DI at none against FirstSeed Planner's 3. 4DI also leads on iOS requirement (18.6 vs 26.0). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. FirstSeed Planner sells 3 in-app purchases, starting at $3.49 per month. 4DI asks for nothing beyond the download.

UpkeepUpdate frequency

4DI ships an update every 5 days, FirstSeed Planner every 3 days. Both last shipped on October 19, 2026.

Scorecard2 real differences · 8 level
4DI versus FirstSeed Planner: the parameters behind the verdict, then further details
Parameter4DIFirstSeed Planner
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—81.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 5 daysEvery 3 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhoneiPhone, iPad — better
Requires iOS18.6 — better26.0
Further details — not scored
Size5 MB41 MB
Age rating4+4+
DeveloperRobert PoetzschFirstSeed Inc

In-app purchases

None

4DI

No in-app purchases

3 purchases

FirstSeed Planner

Subscriptions2
  • Pro Monthly7 Days trial$3.491 Month
  • Pro Yearly1 Month trial$29.991 Year
One-time1
  • Lifetime$89.99

Questions

Is 4DI free?
4DI is free to download, with no in-app purchases.
Is FirstSeed Planner free?
FirstSeed Planner is free to download, with in-app purchases available.
Do 4DI or FirstSeed Planner have ads?
Neither 4DI nor FirstSeed Planner shows ads.
Which is updated more often, 4DI or FirstSeed Planner?
4DI ships an update every 5 days, and FirstSeed Planner every 3 days. Most recently, 4DI was updated on October 19, 2026 and FirstSeed Planner on October 19, 2026.

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