String Theory! vs 4ToDo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
String Theory!
This app provides a digital space to visually organize ideas, clues, and connections. Create interactive boards with photos, notes, and images, then link them with strings to uncover patterns. It's designed to help users map out complex information for various creative and analytical tasks.
- Unlimited detective boards
- Add photos, images, and notes
- Pin items freely
- Connect clues with strings
- Organize with tags
- Distraction-free design
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String Theory is a visual detective board app that helps you organize ideas, clues, and connections in one place. Create interactive boards where you can add Polaroid-style photos, notes, tags, and images, pin them freely, and connect everything with strings to reveal patterns and relationships. Perfect for detectives, writers, students, researchers, and creative thinkers, String Theory turns complex information into a clear visual map. Whether you’re solving a mystery, planning a story, organizing research, or brainstorming ideas, your board evolves as your thoughts connect. Features: - Create unlimited detective boards - Add Polaroid photos, images, and notes - Pin items anywhere on the board - Connect clues using realistic strings - Use tags to organize and group ideas - Clean, intuitive, and distraction-free design Organize your thoughts visually. See the connections. Follow the strings. Apple Terms of Use (EULA) https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
4ToDo
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4ToDo rethinks how you manage your life. Instead of boring checklists, every task, routine, and goal is a visual progress bar — you see exactly where you stand at a glance. TASKS — ORGANIZED BY CATEGORY Create categories like Home, Work, Tech, or Travel. Each category shows a bold progress card with a colored accent bar and a live percentage. Tap into a category to see all tasks sorted by due date. Add subtasks to break down complex projects — the progress bar fills as you check them off. ROUTINES — NEVER FORGET RECURRING TASKS Track recurring maintenance tasks like reading the electricity meter, changing filters, backing up photos, or rotating tires. Set intervals from daily to yearly, or define a custom cycle (every X days). Each routine has its own color and icon. The urgency fill shifts from calm to amber to red as the deadline approaches. One tap to mark it done and reset the timer. GOALS — THREE WAYS TO TRACK Set personal goals with the tracking mode that fits: - Counter — Big +/- buttons for step-by-step tracking (books read, recipes cooked, trails hiked) - Value — Enter custom amounts (kilometers run, hours practiced) - Slider — Drag to set your progress visually Add milestones to goals and tap to mark them as reached. The app automatically updates your progress when you hit a milestone. RADAR — YOUR COMMAND CENTER The Radar page answers one question: What should I do next? It shows your closest goal at the top, overdue items that need attention, and a unified timeline of everything coming up over the next 14 days — grouped by day. Tap any item to open it. Hit the checkmark to complete it instantly. A weekly momentum heatmap shows your activity pattern. BUILT FOR RELIABILITY - Automatic backups every 7 days, plus manual backup on demand - Import and export your data as JSON - Restore from any of your last 7 backups - Local notifications with reminders for tasks, routines, and goals - All data stored locally on your device — nothing leaves your phone DESIGN PHILOSOPHY 4ToDo uses a striking dark theme with yellow accents and 8 category colors. Every element communicates status visually through progress bars. No clutter, no complexity — just a clear view of what matters. Built by robspace.
Screenshots
Verdict
The clearest difference is price: String Theory! at Free against 4ToDo's $1.99. String Theory! also leads on device support (3 vs 1) and iOS requirement (15.1 vs 26.0). 4ToDo's advantage is in-app purchases (none vs 3) and ads (none vs shown).
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
String Theory! is free to download; 4ToDo costs $1.99 up front. String Theory! sells 3 in-app purchases, starting at $2.99 per 7 days. 4ToDo asks for nothing beyond the download.
| Parameter | String Theory! | 4ToDo |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 2.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | — | Every 6 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.1 — better | 26.0 |
| Further details — not scored | ||
| Size | 56 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Synthify Inc | Robert Poetzsch |
In-app purchases
String Theory!
- Weekly$2.997 Days
- Yearly$24.991 Year
- One Time$29.99
4ToDo
No in-app purchases









