Simple Log vs Big Yellow Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Simple Log
This app allows you to easily track and record daily moments, habits, and routines. Document reflections, manage business logs, or keep a hobby journal with features like templates, image/audio attachments, and cloud backup.
- Template-based entries
- Image and audio attachments
- Date, time, and location stamping
- Search and filter functionality
- Cloud backup and sync
- CSV export
- Full API access
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Simple Log is a journal, diary, and log service that lets you track and record moments, habits, and routines throughout your day — quickly and easily. ============= Use it to build habits, document reflections, as a work or business log, or a hobby journal. Anytime you want to document something for later reference, Simple Log is the right tool! New Entries: Adding a new entry is a snap with the template feature. Create templates for common entry types and add them with just a few taps. For example, keeping track of exercise days or appointments. A set template helps you to create a new entry using a set form so that each entry is consistent. Images and Audio: Attach images or record audio and attach to entries with ease. Each entry is automatically stamped with the date, time, and location. Search and Filter: Filters allow you to configure fast searches, so you can recall specific entries quickly and easily. The entries can be charted and exported as CSV. Mobile and web connection: Share and access data quickly between a website or mobile app. Everything backed up safely to the cloud. You can lose your phone, but not your data! FOR YOUR LIFE * Personal: Record your daily thoughts, ideas, and reflections. * Track habits for self-improvement and growth. * Business: Log purchases, mileage, and spending with handy time stamp and location data. FOR YOUR BUSINESS * Organize Projects: Organize research, information about tasks, assignments, and to-do lists. * Research: Store and organize sources for term papers, blogs, writing projects, and more. Save links and websites you want to visit later. * The entries can be charted and exported as CSV. FOR YOUR HEALTH * Exercise: Track your workouts and fitness progress. * Record eating habits, healthy recipes, exercise techniques. FOR YOUR HOBBIES * Travel log: record destinations, hotel information, tickets, and quickly recall coordinates with the location entry tracker. * Log amateur radio ham contacts. SimpleLog has a full API. Use the API and webhooks to add entries from external applications. SimpleLog is a free service with advanced features for members. MORE FEATURES: * All entries are stored safely in the cloud. * Searchable entries using hashtags. * Quick entries with form templates-based entries. * Image attachments. * Audio attachments. * Themes. * Full API access. See our Terms of Service: https://simplelog3.com/help/terms See our Privacy Policy: https://simplelog3.com/help/privacy
Big Yellow Diary
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Why keep a diary? My answer is, because some information may seem unimportant at the time, but later you might need it and forget it. For example, today I plan to visit a friend's house. I’ve been there before, but I just can't remember the exact address. Another example is, there’s someone around me who said something, how can I judge if it’s true or not? One way is to compare it with what they’ve said before and see if there are any contradictions. Without a diary, there's no way to make such a comparison.
Screenshots
Verdict
The clearest difference is update cadence: Big Yellow Diary at every 6 days against Simple Log's monthly. Simple Log's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases 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. Simple Log sells 1 in-app purchase, starting at $3.49 per month and Big Yellow Diary sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Simple Log ships an update monthly, Big Yellow Diary every 6 days. The most recent releases landed on October 17, 2026 and October 25, 2026 respectively.
| Parameter | Simple Log | Big Yellow Diary |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Monthly | Every 6 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 47 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Soki Creative LLC | 山 黄 |
In-app purchases
Simple Log
- SimpleLog3 Monthly$3.491 Month
Big Yellow Diary
- Plus version$1.99








